Cylindrical battery monomer, battery and electric equipment

Abstract

The utility model belongs to the technical field of battery devices, and particularly relates to a cylindrical battery monomer, a battery and electric equipment. Wherein the cylindrical battery cell comprises: a cylindrical shell provided with an accommodating space, the cylindrical shell is provided with a first end and a second end which are opposite to each other, the first end is provided with a first assembly opening communicated with the accommodating space, and the second end is a closed end; the naked battery cell is mounted in the accommodating space, and the naked battery cell is provided with a first tab and a second tab; the pole structure is mounted in the first assembly opening, and the pole structure is electrically connected with the first tab; the first switching piece is mounted in the accommodating space, the first switching piece comprises a body and at least one welding part arranged on the body, the welding part is welded with the second tab, one side, far away from the second tab, of the body is welded with the inner wall of the second end, and the welding part protrudes towards the direction of the second tab. According to the technical scheme, the problem that in the prior art, when the adapter piece is welded at the closed end of the cylindrical shell, a naked battery cell is prone to being burnt and damaged is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery devices, and in particular relates to a cylindrical battery cell, a battery and an electrical device. Background Art

[0002] With the gradual popularization of new energy technologies, lithium battery technology has continued to develop. Lithium batteries are favored by the new energy industry because of their excellent characteristics such as large power storage capacity, stable power supply capacity, and long service life.

[0003] At present, lithium battery cells mainly include square battery cells and cylindrical battery cells. Among them, cylindrical battery cells have the advantages of high capacity, long cycle life, and wide operating temperature range. Therefore, batteries composed of cylindrical battery cells are widely used in new energy products.

[0004] The cylindrical battery cell includes a bare cell, a cylindrical shell and a top cover. The cylindrical shell is open at one end and closed at the other end. The top cover is installed to the open end of the cylindrical shell body and forms a sealing arrangement, thereby forming a accommodating inner cavity, and the bare cell is installed in the accommodating inner cavity.

[0005] After placing the bare cell into the accommodating cavity of the cylindrical shell, generally, the negative pole ear of the bare cell is welded to the inner wall of the closed end of the cylindrical shell through an adapter sheet, so that the entire cylindrical shell serves as the negative terminal of the cylindrical battery cell. However, in the related art, since the adapter sheet is a thin sheet material with a relatively thin thickness, and since all the components in the accommodating cavity need to be compactly assembled to make full use of the limited accommodating cavity, the adapter sheet is made to be attached to the bare cell. In this way, when welding the adapter sheet, a large amount of heat is concentrated on the adapter sheet. Since the adapter sheet is attached to the bare cell, the heat is easily transferred to the bare cell, which in turn causes burn damage to the bare cell. In severe cases, the bare cell may even be damaged and scrapped, affecting the product yield of the cylindrical battery. Utility Model Content

[0006] The purpose of the present application is to provide a cylindrical battery cell, a battery and an electrical device, aiming to solve the problem in the related art that when the adapter plate is welded at the closed end of the cylindrical shell, it is easy to cause burning damage to the bare battery cell.

[0007] To achieve the above-mentioned purpose, according to the first aspect of the present application, the technical solution adopted in the present application is: a cylindrical battery cell, comprising:

[0008] A cylindrical shell is provided with a receiving space, the cylindrical shell has a first end and a second end opposite to each other, the first end is provided with a first assembly opening communicating with the receiving space, and the second end is a closed end;

[0009] A bare battery cell is installed in the accommodation space, and the bare battery cell has a first pole ear and a second pole ear;

[0010] A pole structure is installed in the first assembly opening, and the pole structure is electrically connected to the first pole lug;

[0011] The first adapter plate is installed in the accommodating space. The first adapter plate includes a main body and at least one welding portion arranged on the main body. The welding portion is welded to the second pole ear. The side of the main body away from the second pole ear is welded to the inner wall of the second end, wherein the welding portion protrudes toward the second pole ear.

[0012] In the cylindrical battery cell, since the welding portion protrudes toward the direction of the second pole ear, that is, there is a height difference between the welding surface between the welding portion and the second pole ear and the welding surface between the body and the inner wall of the second end along the height direction of the cylindrical battery cell, the cylindrical battery cell welds the second pole ear of the bare cell to the inner wall of the second end of the cylindrical shell through the first adapter, so that most of the welding heat generated when welding the inner wall of the second end and the body is transferred from the second end to the second pole ear through the air gap between the body and the second pole ear, and a small part of the heat is transferred from the second end to the second pole ear through the path of the body and the welding portion. In this way, the heat generated by welding can be reduced from being transferred to the bare cell, thereby helping to reduce the probability of burning damage to the bare cell caused by the heat generated by welding, and the pole ear is conducive to improving the product yield of the cylindrical battery cell.

[0013] In one embodiment of the present application, there are multiple welding parts, which are symmetrically arranged in pairs about the center point of the body, so that the action between the first adapter plate and the second pole ear is symmetrical in pairs, thereby ensuring the welding strength between the second pole ear and the first adapter plate.

[0014] In one embodiment of the present application, at least two third positioning structures are provided on the inner wall of the second end, and at least two fourth positioning structures are provided on the side of the inner wall of the main body facing the second end. The third positioning structures and the fourth positioning structures are installed one by one, so that the main body of the first adapter plate and the inner wall of the second end can be quickly positioned.

[0015] In one embodiment of the present application, there are multiple fourth positioning structures, and the multiple fourth positioning structures are symmetrically arranged in pairs about the center point of the main body, so that the main body of the first adapter plate and the inner wall of the second end can be quickly positioned.

[0016] In one embodiment of the present application, at least one fourth positioning structure is provided between two adjacent welding portions along the circumference of the body, so that the body of the first adapter plate and the inner wall of the second end can be quickly positioned.

[0017] In one embodiment of the present application, the third positioning structure is configured as a groove, and the fourth positioning structure is configured as a protrusion, so that the body of the first adapter plate and the inner wall of the second end can be quickly positioned.

[0018] In one embodiment of the present application, the shape of the body is set to be circular and matches the shape of the inner wall of the second end. In this way, when the first adapter is placed in the accommodation space, the first adapter will not deviate left and right with respect to the inner wall of the second end. At this time, the first adapter only needs to be rotated and adjusted around the axis of the cylindrical shell to enable the fourth positioning structure to quickly complete the one-to-one corresponding positioning assembly with the third positioning structure.

[0019] In one embodiment of the present application, the pole structure includes a first end cover and a second adapter plate, the first end cover covers the first assembly opening, the second adapter plate includes a first connection portion and a second connection portion connected to each other, the first connection portion and the second connection portion have a height difference along the axial direction of the cylindrical shell, the first connection portion is welded to the first end cover, and the second connection portion is welded to the first pole ear. When welding between the first end cover and the first connection portion, a part of the heat generated by welding is transferred from the first end cover to the first connection portion, and then the first connection portion transfers heat to the second connection portion, and then the heat can be transferred from the second connection portion to the first pole ear, which slows down the heat transfer speed, and most of the heat is transferred through the air gap formed between the first pole ear and the first end cover, which greatly reduces the efficiency of heat transfer to the first pole ear. Therefore, it is possible to reduce the heat generated by welding and transferred to the bare battery cell, which is beneficial to reduce the probability of the heat generated by welding causing burn damage to the bare battery cell, and then helps to improve the product yield of the battery cell.

[0020] In one embodiment of the present application, the first connecting portion is an annular structure as a whole, the second connecting portion is an annular structure as a whole, and the two annular structures are coaxially arranged. In this way, the design structure of the second adapter is simplified, so that the second adapter is easy to manufacture and the production efficiency is improved.

[0021] In one embodiment of the present application, there are multiple first connection parts, and there are multiple second connection parts, and the multiple first connection parts are alternately connected with the multiple second connection parts in the circumferential direction. The multiple first connection parts are all welded to the first end cover, which improves the welding strength between the second adapter and the first end cover and improves the connection stability. The multiple second connection parts are all welded to the first pole ear of the bare battery cell, which improves the welding strength between the second adapter and the first pole ear and improves the connection stability.

[0022] In one embodiment of the present application, each second connecting portion is provided with a first weld mark area, which protrudes in the direction of the first pole ear, and can clearly and accurately mark the welding position between the second connecting portion and the first pole ear, so as to quickly align the first pole ear and the second connecting portion, and then perform the welding operation, thereby improving the welding efficiency.

[0023] In one embodiment of the present application, a plurality of first weld print areas are symmetrically arranged in pairs about the center point of the second adapter plate, so that the acting forces between two opposite first weld print areas and the first end cover are symmetrical, thereby ensuring the welding stability between the first end cover and the second adapter plate.

[0024] In one embodiment of the present application, the first end cover is provided with at least two first positioning structures, and the first connecting portion is provided with at least two second positioning structures on the side facing the first end cover. The second positioning structures are installed one-to-one with the first positioning structures, so that the first end cover and the second adapter plate can be quickly and accurately aligned, and then the welding operation is performed, thereby improving the welding efficiency.

[0025] According to a second aspect of the present application, a battery is provided, wherein the battery comprises the cylindrical battery cell as described above.

[0026] According to a second aspect of the present application, an electrical device is provided, wherein the electrical device comprises the battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is an exploded schematic diagram of a cylindrical battery cell according to an embodiment of the present application;

[0029] Figure 2 This is a schematic structural diagram of a first adapter sheet in a cylindrical battery cell according to an embodiment of the present application;

[0030] Figure 3 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0031] Figure 4 for Figure 1 A partial cross-sectional schematic diagram of a cylindrical battery cell is shown;

[0032] Figure 5 A schematic diagram of the structure of the second adapter in the cylindrical battery cell of an embodiment of the present application;

[0033] Figure 6 This is a schematic diagram of the structure of the first end cover in the cylindrical battery cell of the embodiment of the present application;

[0034] Figure 7 It is a schematic diagram of an exploded view of a battery according to an embodiment of the present application;

[0035] Figure 8 This is a schematic diagram of the structure of the electrical equipment according to an embodiment of the present application.

[0036] Among them, the reference numerals in the figure are:

[0037] 10. Second adapter;

[0038] 11. first connection part; 112. second positioning structure; 12. second connection part; 121. first welding area; 13. first injection hole;

[0039] 20. Battery cells;

[0040] 21. cylindrical shell; 201. first end; 202. second end; 211. first assembly opening; 212. accommodation space; 213. rolling groove structure; 214. circumferential flange; 22. bare battery cell; 221. first welding part; 222. shoulder; 23. first end cover; 231. second liquid injection hole; 232. explosion-proof notch; 233. circumferential installation area; 234. second welding part; 24. insulation assembly; 241. first insulation member; 242. second insulation member; 25. screw cap; 26. block;

[0041] 30. Battery;

[0042] 31. Box shell; 311. Box body; 312. Box cover; 313. Assembly space;

[0043] 40. Electrical equipment;

[0044] 41. driving motor; 42. frame; 43. wheels;

[0045] 50. First adapter plate; 51. Main body; 52. Welding portion; 53. Fourth positioning structure. DETAILED DESCRIPTION

[0046] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0047] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application 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 should not be understood as a limitation on the present application.

[0048] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] At present, in order to meet the requirements of high endurance, electric vehicles generally use multiple battery cells to form a battery, which stores electricity and supplies power, thereby storing a large amount of electricity to ensure high endurance. Among them, cylindrical battery cells have the advantages of high capacity, long cycle life, and wide operating temperature range. Therefore, batteries composed of cylindrical battery cells are widely used in new energy products.

[0051] At present, lithium battery cells mainly include square battery cells and cylindrical battery cells. Among them, cylindrical battery cells have the advantages of high capacity, long cycle life, and wide operating temperature range. Therefore, batteries composed of cylindrical battery cells are widely used in new energy products.

[0052] After placing the bare cell into the accommodating cavity of the cylindrical shell, generally, the negative pole ear of the bare cell is welded to the inner wall of the closed end of the cylindrical shell through an adapter sheet, so that the entire cylindrical shell serves as the negative terminal of the cylindrical battery cell. However, in the related art, since the adapter sheet is a thin sheet material with a relatively thin thickness, and since all the components in the accommodating cavity need to be compactly assembled to make full use of the limited accommodating cavity, the adapter sheet is made to be attached to the bare cell. In this way, when welding the adapter sheet, a large amount of heat is concentrated on the adapter sheet. Since the adapter sheet is attached to the bare cell, the heat is easily transferred to the bare cell, which in turn causes burn damage to the bare cell. In severe cases, the bare cell may even be damaged and scrapped, affecting the product yield of the cylindrical battery.

[0053] Based on the above considerations, an embodiment of the present application provides a cylindrical battery cell, in which a first adapter includes a body and a welding portion disposed on the body, wherein the welding portion protrudes in the direction of the second pole ear, and the welding portion is welded to the second pole ear of the bare cell, and the body is welded to the inner wall of the second end of the cylindrical shell. Since the welding portion protrudes in the direction of the second pole ear, that is, the welding surface between the welding portion and the second pole ear and the welding surface between the body and the inner wall of the second end have a height difference along the height direction of the cylindrical battery cell, the cylindrical battery cell welds the second pole ear of the bare cell to the inner wall of the second end of the cylindrical shell through the first adapter, and welding heat is generated when welding the inner wall of the second end and the body, and most of the welding heat is transferred from the second end to the second pole ear through the air gap between the body and the second pole ear. The thermal conductivity of the air gap is low, so that the heat transferred to the second pole ear is greatly reduced; a small part of the heat is transferred from the second end to the second pole ear through the path of the body and the welding portion. This can reduce the heat generated by welding that is transferred to the bare battery cell, thereby reducing the probability of burning damage to the bare battery cell caused by the heat generated by welding, and improving the product yield of cylindrical battery cells. In addition, the cylindrical battery cells obtained by production are used to produce batteries, and the batteries are applied to corresponding electrical equipment, and the batteries provide stable power supply capabilities for the electrical loads of the electrical equipment.

[0054] like Figure 1 , Figure 3 and Figure 4 As shown, an embodiment of the present application provides a cylindrical battery cell 20. The cylindrical battery cell 20 includes a cylindrical shell 21, a bare cell 22, a pole structure and a first adapter 50. The cylindrical shell 21 is provided with a receiving space 212, and the cylindrical shell 21 has a first end 201 and a second end 202 opposite to each other. The first end 201 is provided with a first assembly opening 211 connected to the receiving space 212, and the second end 202 is a closed end. The bare cell 22 is installed in the receiving space 212, and the bare cell 22 has a first pole ear and a second pole ear. The pole structure is installed in the first assembly opening 211, and the pole structure is electrically connected to the first pole ear. The first adapter 50 is installed in the accommodating space 212. The first adapter 50 includes a body 51 and at least one welding portion 52 disposed on the body 51. The welding portion 52 is welded to the second pole tab, and the body 51 is welded to the inner wall of the second end 202, so that the second pole tab forms a good conductive performance with the cylindrical shell 21 through the first adapter 50, that is, the cylindrical shell 21 serves as a battery terminal of the cylindrical battery cell 20. Among them, the welding portion 52 protrudes toward the direction of the second pole tab, and the body 51 is farther away from the second pole tab relative to the welding portion 52, that is, when welding and assembling, a height difference is formed between the body 51 and the second pole tab along the height direction of the cylindrical battery cell 20, and a certain distance is spaced between the body 51 and the second pole tab, that is, an air gap of a certain thickness is formed.

[0055] In the cylindrical battery cell 20, the second pole tab of the bare cell 22 is electrically connected to the welding portion 52, and the body 51 is electrically connected to the second end 202 of the cylindrical shell 21. When the cylindrical battery cell 20 is working, the current flows through the second end 202, the body 51, the second pole tab and the bare cell 22 in sequence.

[0056] In some embodiments of the present application, in the cylindrical battery cell 20 , the first pole tab is the positive pole tab of the bare battery cell 22 , and the second pole tab is the negative pole tab of the bare battery cell 22 .

[0057] In the cylindrical battery cell 20, since the welding portion 52 protrudes toward the direction of the second pole ear, that is, there is a height difference between the welding surface between the welding portion 52 and the second pole ear and the welding surface between the main body 51 and the inner wall of the second end 202 along the height direction of the cylindrical battery cell 20. Therefore, the cylindrical battery cell 20 electrically connects the second pole ear of the bare cell 22 with the inner wall of the second end 202 of the cylindrical shell 21 through the first adapter 50, and welding heat is generated when the inner wall of the second end 202 and the main body 51 are welded. Most of the welding heat is transferred from the second end 202 and the main body 51 to the second pole ear through the air gap between the main body 51 and the second pole ear, and a small part of the heat is transferred from the second end 202 and the main body 51 to the second pole ear through the path of the main body 51 and the welding portion 52. Since the thermal conductivity of the air gap is very low, the heat generated by welding can be reduced from being transferred to the bare battery cell 22 , thereby reducing the probability of the bare battery cell 22 being burned by the heat generated by welding, and improving the product yield of the cylindrical battery cell 20 .

[0058] In some embodiments of the present application, the protrusion height of the welding portion 52 relative to the main body 51 is 0.1 mm-1.0 mm. Also, the thickness of the main body 51 is 0.1 mm-1.0 mm.

[0059] In some embodiments of the present application, Figure 1 and Figure 2 As shown, there are multiple welding parts 52, and the multiple welding parts 52 are symmetrically arranged in pairs about the center point of the body 51. That is to say, the multiple welding parts 52 are distributed in the circumferential direction around the center point of the body 51. In this way, the multiple welding parts 52 are all welded to the second pole lug, and the welding parts 52 that are symmetrical in pairs are welded to the corresponding second pole lugs, so that the welding strength between the first adapter plate 50 and the second pole lug is also symmetrical about the center point of the body 51, avoiding the problem of high welding strength on one side of the center point and low welding strength on the other side, so that the second pole lug and the first adapter plate 50 are not easy to break and detach, ensuring that the second pole lug and the first adapter plate 50 are always firmly and stably connected and conductive.

[0060] In a preferred embodiment of the present application, a plurality of welding portions 52 are evenly spaced around the center point of the body 51 along the circumferential direction to ensure that the welding strength between the second pole tab and the first adapter plate 50 is relatively uniform in the circumferential direction, so that the second pole tab and the first adapter plate 50 are not easily broken or separated.

[0061] In some embodiments of the present application, the inner wall of the second end 202 is provided with at least two third positioning structures, and, as Figure 1 and Figure 2 As shown, at least two fourth positioning structures 53 are provided on one side of the inner wall of the body 51 facing the second end 202, and the third positioning structure is installed in a one-to-one correspondence with the fourth positioning structure 53. When the first adapter 50 is placed into the accommodating space 212, the third positioning structure and the fourth positioning structure 53 are installed in a corresponding manner, so that the body 51 of the first adapter 50 and the inner wall of the second end 202 are quickly positioned, and then the body 51 and the inner wall of the second end 202 are welded, and due to the mutual restriction between the third positioning structure and the fourth positioning structure 53, the first adapter 50 will not rotate relative to the inner wall of the second end 202 during the welding process, ensuring that the welding work is carried out efficiently, thereby improving the welding work efficiency.

[0062] In some embodiments of the present application, Figure 1 and Figure 2 As shown, there are multiple fourth positioning structures 53, and the multiple fourth positioning structures 53 are symmetrically arranged in pairs about the center point of the body 51. Correspondingly, there are also multiple third positioning structures, and the multiple third positioning structures are arranged in one-to-one correspondence with the multiple fourth positioning structures 53. By assembling the multiple third positioning structures and the multiple fourth positioning structures 53 in one-to-one correspondence, a positioning restriction is formed between the first adapter plate 50 and the second end 202, so that the first adapter plate 50 will not rotate relative to the inner wall of the second end 202 during the welding process, ensuring that the welding work is carried out efficiently, thereby improving the welding work efficiency.

[0063] In some embodiments of the present application, the plurality of fourth positioning structures 53 are evenly spaced around the center point of the body 51. The plurality of third positioning structures and the plurality of fourth positioning structures 53 are assembled one by one, so that the first adapter 50 and the second end 202 are positioned to form a restriction and the connection is more stable.

[0064] In a preferred embodiment of the present application, two fourth positioning structures 53 are provided, and the two fourth positioning structures 53 are symmetrically arranged about the center point of the body 51. Correspondingly, two third positioning structures are provided, and the two third positioning structures are arranged in a one-to-one correspondence with the two fourth positioning structures 53. In this way, by assembling the two fourth positioning structures 53 in a one-to-one correspondence with the two third positioning structures, a positioning restriction is formed between the first adapter plate 50 and the second end 202. In the welding process, the first adapter plate 50 will not rotate relative to the inner wall of the second end 202. While ensuring the limited connection, the manufacturing process of the third positioning structure and the fourth positioning structure 53 is simplified as much as possible, which is conducive to efficient welding work, thereby improving welding work efficiency.

[0065] In some embodiments of the present application, Figure 2 As shown, at least one fourth positioning structure 53 is provided between two adjacent welding portions 52 along the circumference of the body 51. There are multiple welding portions 52, and the multiple welding portions 52 are distributed at intervals along the circumference around the center point of the body 51. In this way, the welding portions 52 and the fourth positioning structures 53 are alternately arranged along the circumference, that is, the welding positions and the limiting positions are alternately distributed, so that the overall stability of the second tab, the first adapter 50 and the second end 202 is further enhanced.

[0066] In some embodiments of the present application, the third positioning structure is set as a groove, and the fourth positioning structure 53 is set as a protrusion. When the first adapter plate 50 is placed in the accommodating space 212, the first adapter plate 50 is rotated and adjusted so that the protrusion is inserted into the groove, thereby quickly completing the positioning and assembly between the third positioning structure and the fourth positioning structure 53, so that a positioning restriction is formed between the first adapter plate 50 and the second end 202, so that during the welding process, the first adapter plate 50 will not rotate relative to the inner wall of the second end 202, thereby ensuring that the welding work is carried out efficiently, thereby improving the welding work efficiency.

[0067] Specifically, the height of the fourth positioning structure 53 protruding relative to the body 51 is 0.1 mm-1.0 mm. In addition, the height of the fourth positioning structure 53 protruding relative to the body 51 is greater than the height of the welding portion 52 protruding relative to the body 51.

[0068] In some embodiments of the present application, Figure 1 and Figure 2As shown, the shape of the body 51 is set to be circular to match the shape of the inner wall of the second end 202. In this way, when the first adapter plate 50 is placed in the accommodating space 212, the first adapter plate 50 will not be offset left and right relative to the inner wall of the second end 202. At this time, it is only necessary to rotate and adjust the first adapter plate 50 around the axis of the cylindrical shell 21 to enable the fourth positioning structure 53 and the third positioning structure to quickly complete the one-to-one positioning assembly and then perform welding, thereby improving the welding work efficiency.

[0069] Specifically, in the embodiment of the present application, when assembling the bare cell 22, the first adapter plate 50 and the cylindrical shell 21, the second pole ear is first welded to the welding portion 52 of the first adapter plate 50, and then the bare cell 22 and the first adapter plate 50 are placed together in the accommodating space 212 of the cylindrical shell 21, so that the body 51 of the first adapter plate 50 is in contact with the inner wall of the second end 202 of the cylindrical shell 21, and then the bare cell 22 is rotated and adjusted, so that the bare cell 22 drives the first adapter plate 50 to rotate together, and then the fourth positioning structure 53 on the body 51 and the third positioning structure on the inner wall of the second end 202 are positioned and assembled one by one, and then the body 51 and the inner wall of the second end 202 are welded. In this way, during the welding process, the first adapter plate 50 will not rotate relative to the inner wall of the second end 202, ensuring that the welding work is carried out efficiently, thereby improving the welding work efficiency. Furthermore, since the welding portion 52 protrudes toward the second pole ear, that is, an air gap is formed between the welding surface between the welding portion 52 and the second pole ear and the welding surface between the body 51 and the inner wall of the second end 202 along the height direction of the cylindrical battery cell 20, most of the welding heat generated when welding the inner wall of the second end 202 and the body 51 is transferred from the second end 202 to the second pole ear through the air gap between the body 51 and the second pole ear, and a small part of the heat is transferred from the second end 202 to the second pole ear through the path of the body 51 and the welding portion 52. In this way, the heat generated by welding can be reduced from being transferred to the bare battery cell 22, thereby helping to reduce the probability of burning damage to the bare battery cell 22 caused by the heat generated by welding, and the pole ear is conducive to improving the product yield of the cylindrical battery cell 20.

[0070] In some embodiments of the present application, Figure 1 , Figures 3 to 5As shown, the pole structure includes a first end cover 23 and a second adapter plate 10. The first end cover 23 covers the first assembly opening 211 so that the accommodating space 212 is formed into a closed space, and the first end cover 23 and the cylindrical shell 21 are insulated. The second adapter plate 10 includes a first connecting portion 11 and a second connecting portion 12 connected to each other. The first connecting portion 11 and the second connecting portion 12 have a height difference along the axial direction of the cylindrical shell 21, that is, a distance is formed between the first connecting portion 11 and the second connecting portion 12 in the axial direction of the battery cell 20, that is, an air gap is formed. The first connecting portion 11 is welded to the first end cover 23, and the second connecting portion 12 is welded to the first pole ear.

[0071] In the battery cell 20, the first pole ear of the bare cell 22 is electrically connected to the second connecting portion 12 of the second adapter plate 10, and the first connecting portion 11 of the second adapter plate 10 is electrically connected to the first end cover 23. When the battery cell 20 is discharging or charging, the current flows through the first pole ear, the second connecting portion 12, the first connecting portion 11 and the first end cover 23 in sequence.

[0072] The “enclosed space” in “the first end cover 23 covers the first assembly opening 211 so that the accommodating space 212 is formed into an enclosed space” means that dustproof and waterproof performance can be achieved, and the accommodating space 212 is sealed and airtight.

[0073] The second adapter sheet 10 provided by the present application is used to produce the battery cell 20. Since the second adapter sheet 10 is provided with a first connection portion 11 for welding with the first end cover 23 and a second connection portion 12 for welding with the first pole ear of the bare battery cell 22, and the first connection portion 11 and the second connection portion 12 have a height difference along the height direction of the cylindrical shell 21, that is, a distance is formed between the first connection portion 11 and the second connection portion 12 in the axial direction of the battery cell 20, so that the first pole ear and the first end cover 23 are spaced apart in the accommodating space 212, thereby During welding, part of the heat generated by welding is transferred from the first end cover 23 to the first connecting part 11, and then the first connecting part 11 transfers heat to the second connecting part 12, and then the heat can be transferred from the second connecting part 12 to the first pole ear, which slows down the heat transfer speed. Moreover, most of the heat is transferred through the air gap formed between the first pole ear and the first end cover 23, which greatly reduces the efficiency of heat transfer to the first pole ear. Therefore, the heat generated by welding can be reduced and transferred to the bare battery cell 22, which is beneficial to reduce the probability of the heat generated by welding causing burn damage to the bare battery cell 22, and then helps to improve the product yield of the battery cell 20.

[0074] The distance between the first connection portion 11 and the second connection portion 12 in the axial direction of the battery cell 20 is between 0.1 mm and 10 mm.

[0075] In some embodiments of the present application, the first connection part 11 is an annular structure as a whole, and the second connection part 12 is an annular structure as a whole, and the annular structure of the first connection part 11 as a whole is coaxially arranged with the annular structure of the second connection part 12 as a whole. On the second adapter sheet 10, there is actually a center point position, and the axis of the annular structure formed by the first connection part 11 as a whole and the axis of the annular structure formed by the second connection part 12 as a whole both pass through the center point of the second adapter sheet 10, and the axis of the annular structure formed by the first connection part 11 as a whole and the axis of the annular structure formed by the second connection part 12 as a whole are both perpendicular to the plane where the second adapter sheet 10 is located. In this way, the design structure of the second adapter sheet 10 is simplified, so that the second adapter sheet 10 is easy to manufacture, and the production efficiency is improved.

[0076] In some embodiments of the present application, the first connection portion 11 and the second connection portion 12 are integrally formed into a second adapter plate 10. For example, the second adapter plate 10 is manufactured by punching. Since the center of the circle formed by the first connection portion 11 in the second adapter plate 10 is concentric with the center of the circle formed by the second connection portion 12 in the second adapter plate 10, the structure of the second adapter plate 10 is simplified. Therefore, the simplified structure can reduce the difficulty of punching, thereby improving production efficiency.

[0077] In some embodiments of the present application, Figure 5 As shown, there are multiple first connection parts 11, and the multiple first connection parts 11 are welded to the first end cover 23, which improves the welding strength between the second adapter plate 10 and the first end cover 23 and improves the connection stability. Figure 5 As shown, there are multiple second connection parts 12, and the multiple second connection parts 12 are welded to the first pole ear of the bare battery cell 22, which improves the welding strength between the second adapter 10 and the first pole ear and improves the connection stability. In the second adapter 10, multiple first connection parts 11 and multiple second connection parts 12 are alternately connected in the circumferential direction. In this embodiment, the distribution structure of the first connection part 11 and the second connection part 12 is simple. When the mold is opened and the die is punched, it is only necessary to set the concave and convex structure alternately on the same circumference at the end of the punch to complete the mold opening. The mold opening is simple and quick. In addition, the processing efficiency of the second adapter 10 is relatively high, and the second adapter 10 can be formed by directly punching on the blank.

[0078] In some embodiments of the present application, Figure 5As shown, each second connection portion 12 is provided with a first weld print area 121, and the first weld print area 121 protrudes in the direction of the first pole ear. By specially providing the first weld print area 121 on the second connection portion 12, the welding position between the second connection portion 12 and the first welding portion 221 of the first pole ear can be clearly and accurately identified, so that the first pole ear and the second connection portion 12 can be quickly aligned, and then the welding operation can be performed to improve the welding efficiency. In addition, by welding the first weld print area 121 to the first pole ear of the bare battery cell 22, the welding strength between the second adapter 10 and the first pole ear of the bare battery cell 22 can meet the connection strength requirements, and can meet the overcurrent requirements, ensuring normal conduction between the first pole ear and the second connection portion 12. Furthermore, the protruding first weld print area 121 can shorten the length of the first pole ear accordingly, and then can save the amount of battery cell material used, thereby saving material costs.

[0079] In some embodiments of the present application, Figure 5 As shown, the plurality of first welded areas 121 are symmetrically arranged in pairs relative to the center point of the second adapter sheet 10. In this way, the plurality of first welded areas 121 are welded to the first end cover 23, so that the acting forces between the two opposite first welded areas 121 and the first end cover 23 are symmetrical, thereby ensuring the welding stability between the first end cover 23 and the second adapter sheet 10, and preventing the risk of tearing between the first end cover 23 and the second adapter sheet 10, thereby ensuring stable conduction between the first end cover 23 and the second adapter sheet 10.

[0080] like Figure 5 As shown, the second adapter 10 is provided with a first injection hole 13, and the first connection part 11 and the second connection part 12 both surround the first injection hole 13. After the welding operation is completed on the second adapter 10, the electrolyte is injected into the battery cell 20 through the first injection hole 13 so that the electrolyte infiltrates the bare battery cell 22. Specifically, the first injection hole 13 is formed by surrounding the first connection part 11 and / or the second connection part 12. In the present application, the first injection hole 13 is opened in the middle position of the second adapter 10, so that the setting of the first injection hole 13 does not affect the mechanical strength of the second adapter 10 itself, and facilitates the injection operation.

[0081] like Figure 6 As shown, the first end cap 23 is provided with a second injection hole 231, and the second injection hole 231 is arranged opposite to the first injection hole 13 of the second adapter plate 10. That is, the second injection hole 231 is opened in the middle of the first end cap 23, so that the setting of the second injection hole 231 does not affect the mechanical strength of the first end cap 23 itself, and the injection operation is convenient. Figure 4As shown, after the injection operation is completed, the block 26 is inserted into the second injection hole 231 to seal the second injection hole 231, and then the screw cap 25 is screwed onto the first end cover 23 and the screw cap 25 completely covers the block 26, thereby preventing the block 26 from escaping from the second injection hole 231, ensuring that the electrolyte in the battery cell 20 will not leak.

[0082] In some embodiments of the present application, the battery cell 20 further includes an insulating component 24, which is disposed between the first end cover 23 and the cylindrical shell 21. The insulating component 24 is used to insulate the first end cover 23 from the cylindrical shell 21, thereby ensuring that no short circuit occurs between the first end cover 23 and the cylindrical shell 21, and ensuring that the battery cell 20 can be normally conducted. Figure 1 , Figure 3 , Figure 4 As shown, the insulating assembly 24 includes a first insulating member 241 and a second insulating member 242, and the first insulating member 241 and the second insulating member 242 are arranged opposite to each other to cover the circumferential edge of the first end cover 23, and the circumferential side walls of the first insulating member 241 and the second insulating member 242 are abutted against the inner wall of the cylindrical shell 21, so that the first end cover 23 and the cylindrical shell 21 are insulated. By using the first insulating member 241 and the second insulating member 242 to stack the circumferential edge of the first end cover 23 up and down to cover the circumferential edge of the first end cover 23, the first insulating member 241 and the second insulating member 242 can quickly cover the circumferential edge of the first end cover 23, thereby improving the assembly efficiency.

[0083] In some embodiments of the present application, the cylindrical housing 21 is a cylindrical cylindrical housing 21, such as Figure 1 and Figure 3 As shown, the cylindrical shell 21 is provided with a groove structure 213 recessed toward the accommodating space 212, and the groove structure 213 is close to the first assembly opening 211. After the bare battery cell 22 is placed into the accommodating space 212, the groove structure 213 is rolled out circumferentially on the outer side of the cylindrical shell 21, so that the groove structure 213 abuts against the shoulder 222 of the bare battery cell 22, and the bare battery cell 22 is coated with an insulating blue film, so that the groove structure 213 is insulated from the shoulder 222 of the bare battery cell 22. Furthermore, one of the first insulating member 241 and the second insulating member 242 abuts against the side of the groove structure 213 away from the bare battery cell 22 (such as Figure 3In the illustrated battery cell 20, the second insulating member 242 abuts against the side of the groove structure 213 away from the bare battery cell 22), that is, the groove structure 213 supports the circumferential edge of the first end cover 23 so that the first end cover 23 does not collapse into the accommodation space 212. After the first end cover 23 is installed, the cylindrical shell 21 at the first assembly opening 211 is provided with a circumferential flange 214, which is used to press the other of the first insulating member 241 and the second insulating member 242 (such as Figure 3 The battery cell 20 shown is a battery cell 20 in which the first insulating member 241 is pressed by the circumferential flange 214, that is, the first insulating member 241 is arranged between the circumferential flange 214 and the circumferential edge of the first end cover 23, so that the first end cover 23 cannot be separated from the cylindrical shell 21, ensuring that the first end cover 23 is firmly and stably installed at the first assembly opening 211. In addition, the assembled first insulating member 241 and the second insulating member 242 form a sealing arrangement for the gap between the circumferential edge of the first end cover 23 and the circumferential inner wall of the cylindrical shell 21, thereby achieving good dustproof and waterproof performance. At this time, the accommodating space 212 is a closed space.

[0084] When thermal runaway occurs in the battery cell 20 during the charge and discharge process, high-temperature smoke is generated inside the battery cell 20. If the high-temperature and high-pressure smoke cannot be removed in time to release the pressure, the internal pressure of the battery cell 20 will continue to increase (i.e., high-pressure state), which may eventually cause the battery cell 20 to explode, which is very dangerous. Therefore, in some embodiments of the present application, such as Figure 3 and Figure 6 As shown, the first end cover 23 is also provided with an explosion-proof notch 232, so that when the pressure of the high-temperature and high-pressure flue gas in the battery cell 20 reaches the preset pressure threshold of the explosion-proof notch 232, the explosion-proof notch 232 ruptures, thereby achieving internal pressure relief of the battery cell 20 and preventing the battery cell 20 from exploding. The explosion-proof notch 232 may be in an arc shape, and the explosion-proof notch 232 surrounds the second injection hole 231.

[0085] Further, such as Figure 6 As shown, the first end cover 23 has a second welding portion 234, which is welded to the first connecting portion 11, and the second welding portion 234 surrounds the explosion-proof notch 232, that is, the explosion-proof notch 232 is arranged between the second injection hole 231 and the second welding portion 234. In this way, the surface position of the first end cover 23 can be fully utilized, and the structural positions of the second injection hole 231, the explosion-proof notch 232 and the second welding portion 234 are reasonably designed and distributed on the limited surface position of the first end cover 23.

[0086] like Figure 3 and Figure 6As shown, the circumferential edge area of ​​the first end cover 23 is further provided with a circumferential installation area 233, and the first insulating member 241 and the second insulating member 242 are installed in the circumferential installation area 233, so as to facilitate the installation of the first insulating member 241 and the second insulating member 242 on the circumferential edge area of ​​the first end cover 23, thereby covering the circumferential edge area of ​​the first end cover 23 and improving the assembly efficiency. In addition, the second welding portion 234 is located between the explosion-proof notch 232 and the circumferential installation area 233.

[0087] In some embodiments of the present application, the first end cover 23 is provided with at least two first positioning structures, such as Figure 5 As shown, at least two second positioning structures 112 are provided on one side of the first connection portion 11 facing the first end cover 23, and the second positioning structures 112 are installed one-to-one with the first positioning structures. When the first end cover 23 is placed on the second adapter plate 10 so that the first end cover 23 and the second adapter plate 10 are aligned with each other, the first positioning structure and the second positioning structure 112 are assembled with each other, so that the first end cover 23 and the second adapter plate 10 can be quickly and accurately aligned, and then the welding operation is performed, thereby improving the welding efficiency.

[0088] In some embodiments of the present application, the first positioning structure is configured as a groove, and the corresponding second positioning structure 112 is configured as a boss, and the height between the top of the boss and the surface of the first connecting portion 11 is between 0.1 mm and 10 mm.

[0089] According to a second aspect of the present application, a battery 30 is provided, such as Figure 7 The battery 30 includes the aforementioned battery cells 20, which are distributed in an array.

[0090] like Figure 7 As shown, the battery 30 further includes a box shell 31, which forms an assembly space 313. The box shell 31 includes a box body 311 and a box cover 312, and the box cover 312 covers the box body 311 to form a closed assembly space 313. The battery cells 20 are installed in the assembly space 313 in an array.

[0091] According to a third aspect of the present application, there is provided an electrical device 40, such as Figure 8 The electrical device 40 includes the aforementioned battery 30 , which is used to charge and store energy, and to discharge and provide electrical energy for the electrical load of the electrical device 40 .

[0092] The electrical equipment 40 includes but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, the electric toys may include but are not limited to fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. The spacecraft may include but is not limited to airplanes, rockets, space shuttles, and spacecraft, etc.

[0093] In the embodiment of the present application, the electrical equipment 40 is an electric vehicle, such as Figure 8 As shown, the battery 30 is installed on the frame 42 of the electric vehicle. The battery 30 provided by the embodiment of the present application is used to power the driving motor 41 of the electric vehicle (i.e., the power load of the power-consuming device 40), and the driving motor 41 drives the wheels 43 to rotate, so that the electric vehicle can travel normally.

[0094] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cylindrical battery cell, characterized in that: include: A cylindrical shell is provided with a receiving space, the cylindrical shell has a first end and a second end opposite to each other, the first end is provided with a first assembly opening communicating with the receiving space, and the second end is a closed end; A bare battery cell is installed in the accommodation space, and the bare battery cell has a first pole tab and a second pole tab; A pole structure, mounted in the first assembly opening, the pole structure being electrically connected to the first pole lug; A first adapter plate is installed in the accommodating space, the first adapter plate includes a main body and at least one welding portion arranged on the main body, the welding portion is welded to the second pole ear, and a side of the main body away from the second pole ear is welded to the inner wall of the second end, wherein the welding portion protrudes toward the direction of the second pole ear.

2. The cylindrical battery cell according to claim 1, characterized in that: There are multiple welding parts, and the welding parts are symmetrically arranged in pairs about the center point of the main body.

3. The cylindrical battery cell according to claim 1 or 2, characterized in that: The inner wall of the second end is provided with at least two third positioning structures, the main body is provided with at least two fourth positioning structures, and the third positioning structures are installed in a one-to-one correspondence with the fourth positioning structures.

4. The cylindrical battery cell according to claim 3, characterized in that: The plurality of fourth positioning structures are symmetrically arranged in pairs about the center point of the body.

5. The cylindrical battery cell according to claim 4, characterized in that: At least one fourth positioning structure is provided between two adjacent welding portions along the circumference of the body.

6. The cylindrical battery cell according to any one of claims 3 to 5, characterized in that: The third positioning structure is configured as a groove, and the fourth positioning structure is configured as a protrusion.

7. The cylindrical battery cell according to any one of claims 1 to 6, characterized in that: The shape of the body is set to be circular to match the shape of the inner wall of the second end.

8. The cylindrical battery cell according to any one of claims 1 to 7, characterized in that: The pole structure includes a first end cover and a second adapter plate, the first end cover covers the first assembly opening, the second adapter plate includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion and the second connecting portion have a height difference along the axial direction of the cylindrical shell, the first connecting portion is welded to the first end cover, and the second connecting portion is welded to the first pole ear.

9. The cylindrical battery cell according to claim 8, characterized in that: The first connecting portion is an annular structure as a whole, and the second connecting portion is an annular structure as a whole, and the two annular structures are coaxially arranged.

10. The cylindrical battery cell according to claim 9, characterized in that: There are a plurality of the first connection parts, and there are a plurality of the second connection parts. The plurality of the first connection parts and the plurality of the second connection parts are alternately connected in sequence along the circumferential direction.

11. The cylindrical battery cell according to claim 10, characterized in that: Each of the second connecting portions is provided with a first weld print area, and the first weld print area protrudes toward the direction of the first electrode tab.

12. The cylindrical battery cell according to claim 11, characterized in that: The plurality of first welding areas are symmetrically arranged in pairs about a center point of the second adapter sheet.

13. The cylindrical battery cell according to any one of claims 8 to 12, characterized in that: The first end cover is provided with at least two first positioning structures, and the first connecting portion is provided with at least two second positioning structures on a side facing the first end cover, and the second positioning structures correspond to the first positioning structures one by one.

14. A battery, characterized in that: It comprises a cylindrical battery cell as described in any one of claims 1 to 13.

15. An electrical equipment, characterized in that: Comprising the battery of claim 14.

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