Cylindrical battery monomer, battery and electric equipment

Abstract

The utility model discloses a cylindrical battery monomer, a battery and electric equipment. The cylindrical battery cell comprises: a housing provided with an accommodating space, the accommodating space having a first opening; the electrode assembly is mounted in the accommodating space, and the electrode assembly is provided with a first tab; the first end cover covers the first opening; the first adapter plate is in a plate shape, the first adapter plate comprises a main body part and a protruding part, the main body part is connected with the first tab, the protruding part is arranged on the side, facing the first end cover, of the main body part in a protruding mode, and the main body part is connected with the first end cover. By applying the technical scheme, the problem that the bent position is easy to break due to the fact that the electrode assembly switching piece needs to be bent in the prior art is solved.

Description

Technical Field

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

[0002] With the gradual popularization of new energy technologies, secondary battery technologies have developed accordingly. Secondary batteries are favored by the new energy industry due to their excellent characteristics such as large electricity storage capacity, stable power supply capacity, and long service life.

[0003] In the related art, a transfer sheet is required to transfer between the end cap and the electrode assembly of the cylindrical battery cell to achieve electrical connection. One end of the transfer sheet is connected to the tab of the electrode assembly, and the other end of the transfer sheet is connected to the end cap. Moreover, when the end cap is closed onto the cylindrical housing, the transfer sheet needs to be bent, and the transfer sheet folds to adapt to the assembly space between the end cap and the electrode assembly. However, when the transfer sheet is bent, the bent position is prone to breakage, resulting in the inability to achieve electrical connection between the electrode assembly and the end cap, thereby affecting the product yield of the cylindrical battery cell. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a cylindrical battery cell, a battery, and an electrical device, including but not limited to solving the problem that the transfer sheet of the electrode assembly in the related art needs to be bent, resulting in easy breakage at the bent position.

[0005] The technical solution adopted in the embodiments of the present application is as follows:

[0006] In a first aspect, a cylindrical battery cell is provided, including:

[0007] A housing having an accommodation space and a first opening;

[0008] An electrode assembly installed in the accommodation space, the electrode assembly having a first tab;

[0009] A first end cap covering the first opening;

[0010] A first transfer sheet, the first transfer sheet being plate-shaped, the first transfer sheet including a main body portion and a protruding portion, the main body portion being connected to the first tab, and the protruding portion protruding from the side of the main body portion facing the first end cap, the protruding portion being connected to the first end cap.

[0011] When manufacturing cylindrical battery cells using the first adapter provided in this application, since the first adapter is provided with a main body portion for connecting to the first end cap and a protruding portion for connecting to the first tab of the electrode assembly, and the protruding portion protrudes from the side of the main body portion facing the first end cap, a distance is formed between the main body portion and the protruding portion in the axial direction of the cylindrical battery cell. This enables the first tab and the first end cap to be spaced apart in the accommodation space, thus meeting the requirement of spacing between the electrode assembly and the first end cap. Moreover, this application uses the first adapter to transfer the electrode assembly and the first end cap. Compared with the related art, the first adapter does not need to be bent, ensuring the integrity and self-strength of the first adapter, without the risk of bending and breaking, and always maintaining a stable electrical connection between the electrode assembly and the first end cap.

[0012] In some embodiments of this application, the first adapter is in the shape of a disc as a whole.

[0013] In some embodiments of this application, the main body portion and the protruding portion are arranged radially or circumferentially.

[0014] In some embodiments of this application, both the main body portion and the protruding portion are annular structures, and the main body portion and the protruding portion are nested as inner and outer rings. Further, the axis of the main body portion and the axis of the protruding portion are coaxially arranged. This simplifies the design structure of the first adapter, thereby improving production efficiency.

[0015] In some embodiments of this application, the main body portion is arranged on the outer side of the protruding portion in the radial direction, simplifying the design structure of the first adapter, thereby improving production efficiency.

[0016] In some embodiments of this application, the protruding portion is a circumferentially continuous annular structure, and the main body portion is a circumferentially continuous annular structure. The annular protruding portion can quickly align with the first tab of the bare battery cell, and the annular main body portion can quickly align with the first end cap, thereby improving the working efficiency of welding.

[0017] In some embodiments of this application, the protruding portion is a circumferentially continuous annular structure. The annular protruding portion can quickly align with the first tab of the bare battery cell, thereby improving the working efficiency of welding. The number of main body portions is multiple, and multiple main body portions are all connected to the outer ring of the protruding portion, and two adjacent main body portions are spaced apart. In this way, the heat generated during welding of each main body portion is dispersed, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the electrode assembly.

[0018] In some embodiments of the present application, the main body is a circumferentially continuous annular structure. The annular-shaped main body can be quickly aligned with the first end cap, thereby improving the working efficiency of welding. The number of protruding portions is multiple. The main body is connected to the outer rings of the multiple protruding portions, and two adjacent protruding portions are spaced apart. In this way, heat is dispersed when welding each protruding portion, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the bare battery cell.

[0019] In some embodiments of the present application, the protruding portion is disposed on the outer side of the main body along the radial direction, simplifying the design structure of the first adapter piece, thereby improving the production efficiency.

[0020] In some embodiments of the present application, the main body is a circumferentially continuous annular structure. The annular-shaped main body can be quickly aligned with the first end cap, thereby improving the working efficiency of welding. The protruding portion is a circumferentially continuous annular structure. The protruding portion is connected to the outer ring of the main body. The annular-shaped protruding portion can be quickly aligned with the first tab, thereby improving the working efficiency of welding.

[0021] In some embodiments of the present application, the main body is a circumferentially continuous annular structure. The annular-shaped main body can be quickly aligned with the first end cap, thereby improving the working efficiency of welding. The number of protruding portions is multiple. The multiple protruding portions are all connected to the outer ring of the main body, and two adjacent protruding portions are spaced apart. In this way, heat is dispersed when welding each protruding portion, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the bare battery cell.

[0022] In some embodiments of the present application, the protruding portion is a circumferentially continuous annular structure. The annular-shaped protruding portion can be quickly aligned with the first tab, thereby improving the working efficiency of welding. The number of main bodies is multiple. The protruding portion is connected to the outer rings of the multiple main bodies, and two adjacent main bodies are spaced apart. In this way, heat is dispersed when welding each main body, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the bare battery cell.

[0023] In some embodiments of the present application, the number of main bodies is multiple, and the number of protruding portions is multiple. The multiple main bodies and the multiple protruding portions are alternately connected in sequence along the circumference. In this way, heat is dispersed when welding each main body and each protruding portion, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the bare battery cell.

[0024] In some embodiments of the present application, the multiple main bodies are respectively connected to the first tab, and the multiple protruding portions are respectively connected to the first end cap.

[0025] In some embodiments of the present application, the main body includes a first non-welding region and a first welding region. The first welding region is used for welding to the first electrode tab. The first welding region protrudes relative to the first non-welding region toward the first electrode tab, and the protrusion is welded to the first end cap. Welding is employed between the main body and the first electrode tab, and between the protrusion and the first end cap, to ensure a stable connection and achieve a stable electrical connection between the first end cap and the electrode assembly via the first adapter. Furthermore, the protruding first welding region not only clearly and accurately indicates the welding position of the protrusion and the first electrode tab, but also correspondingly shortens the length of the first electrode tab.

[0026] In some embodiments of the present application, the protrusion includes a second non-welding area and a second welding area. The second welding area is welded to the first end cap. The second welding area protrudes relative to the second non-welding area toward the first end cap, and the main body is welded to the first tab. The protruding second welding area not only clearly and accurately identifies the welding position between the main body and the first end cap, but also allows for better contact between the protrusion and the first end cap, thereby facilitating the welding operation.

[0027] In some embodiments of the present application, the main body and the protruding portion are integrally formed, thereby improving production efficiency.

[0028] In some embodiments of the present application, the first adapter plate is provided with a first liquid injection hole, and both the main body and the protrusion surround the first liquid injection hole. The first liquid injection hole is provided in the middle of the first adapter plate. This ensures that the provision of the first liquid injection hole does not affect the mechanical strength of the first adapter plate itself and facilitates liquid injection.

[0029] In some embodiments of the present application, the first end cap is provided with a second liquid injection hole, which is arranged opposite the first liquid injection hole along the axial direction of the first opening. The second liquid injection hole is provided in the middle of the first end cap. This ensures that the second liquid injection hole does not affect the mechanical strength of the first end cap itself and facilitates liquid injection.

[0030] In some embodiments of the present application, the housing is cylindrical and has a groove structure recessed toward the accommodation space. The groove structure is disposed proximate to the first opening, and the electrode assembly is disposed on a side of the groove structure away from the first opening. The housing at the first opening has a circumferential flange. The cylindrical battery cell further includes a first insulating member and a second insulating member, the second insulating member abutting against a side of the groove structure away from the electrode assembly, and the first insulating member disposed between the circumferential flange and the edge of the first end cap. The groove structure supports the circumferential edge of the first end cap, preventing the first end cap from collapsing into the accommodation space, and the circumferential flange prevents the first end cap from separating from the housing, thereby ensuring that the first end cap is securely and stably mounted at the first opening.

[0031] In some embodiments of the present application, the first end cap is further provided with an explosion-proof notch. The explosion-proof notch is in an arc shape and is arranged around the second liquid injection hole. Moreover, the first end cap has a second welding portion, and the second welding portion is welded to the second welding area. The second welding portion surrounds the explosion-proof notch. In this way, the surface position of the first end cap can be fully utilized, and the structural positions of the second liquid injection hole, the explosion-proof notch, and the second welding portion can be reasonably designed and distributed on the limited surface position of the first end cap.

[0032] In some embodiments of the present application, the housing further has a second opening, and the second opening is disposed opposite to the first opening. The electrode assembly further has a second tab; the cylindrical battery cell further includes a second end cap and a second adapter plate. The second end cap covers the second opening. Among them, the second adapter plate has the same structure as the first adapter plate. The main body portion of the second adapter plate is connected to the second end cap, and the protruding portion of the second adapter plate is connected to the second tab.

[0033] In a second aspect, a battery is provided. Among them, the battery includes the cylindrical battery cell as described above.

[0034] In a third aspect, an electrical device is provided. Among them, the electrical device includes the battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 is an exploded schematic view of a cylindrical battery cell according to an embodiment of the present application;

[0037] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0038] Figure 3 is Figure 1 a partial cross-sectional schematic view of the cylindrical battery cell shown;

[0039] Figure 4 is a structural schematic Figure 1 ;

[0040] Figure 5 is Figure 4 a structural schematic of the electrode assembly Figure 2 ;

[0041] Figure 6 is Figure 1Schematic structural diagram of the first adapter used in the cylindrical battery cell shown;

[0042] Figure 7 is Figure 6 Schematic structural diagram of the protruding part of the first adapter shown with an arc-shaped second welding area;

[0043] Figure 8 is Figure 7 Cross-sectional schematic diagram in the A-A direction in;

[0044] Figure 9 is Figure 6 Schematic structural diagram of the protruding part of the first adapter shown with a circular second welding area;

[0045] Figure 10 is Figure 6 Schematic structural diagram of the protruding part of the first adapter shown with a square second welding area;

[0046] Figure 11 Exploded schematic diagram of another cylindrical battery cell of an embodiment of the present application;

[0047] Figure 12 is Figure 11 Schematic structural diagram of the first adapter used in the cylindrical battery cell shown Figure 1 ;

[0048] Figure 13 is Figure 11 Schematic structural diagram of the protruding part of the first adapter used in the cylindrical battery cell shown with a second welding area;

[0049] Figure 14 is Figure 11 Schematic structural diagram of the first adapter used in the cylindrical battery cell shown Figure 2 ;

[0050] Figure 15 is Figure 11 Schematic structural diagram of the first adapter used in the cylindrical battery cell shown Figure 3 ;

[0051] Figure 16 Exploded schematic diagram of yet another cylindrical battery cell of an embodiment of the present application;

[0052] Figure 17 is Figure 16 Schematic structural diagram of the first adapter used in the cylindrical battery cell shown Figure 1 ;

[0053] Figure 18 is Figure 16 Schematic structural diagram of the first adapter used in the cylindrical battery cell shownFigure 2 ;

[0054] Figure 19 For Figure 16 the structural schematic of the first adapter tab used in the cylindrical battery cell shown Figure 3 ;

[0055] Figure 20 the structural schematic of the first end cap of the cylindrical battery cell according to the embodiment of the present application Figure 1 ;

[0056] Figure 21 the structural schematic of the first end cap of the cylindrical battery cell according to the embodiment of the present application Figure 2 ;

[0057] Figure 22 the structural schematic of the first end cap of the cylindrical battery cell according to the embodiment of the present application Figure 3 ;

[0058] Figure 23 the exploded schematic diagram of the battery provided by the embodiment of the present application;

[0059] Figure 24 the structural schematic diagram of the electrical device provided by the embodiment of the present application.

[0060] Among them, each reference numeral in the figure:

[0061] 10, the first adapter tab;

[0062] 11, the main body; 111, the first welding area; 12, the protruding part; 121, the second welding area; 13, the first liquid injection hole;

[0063] 20, the cylindrical battery cell;

[0064] 21, the housing; 211, the first opening; 212, the accommodating space; 213, the rolling groove structure; 214, the circumferential flanging; 22, the electrode assembly; 220, the first tab; 221, the first welding part; 222, the shoulder; 223, the second tab; 224, the third welding part; 225, the first separator; 226, the second separator; 227, the first electrode plate; 228, the second electrode plate; 23, the first end cap; 231, the second liquid injection hole; 232, the explosion-proof notch; 233, the circumferential installation area; 234, the second welding part; 24, the insulation assembly; 241, the first insulation member; 242, the second insulation member; 25, the screw cap; 26, the plug;

[0065] 30, the battery;

[0066] 31, the box shell; 311, the box main body; 312, the box cover; 313, the assembly space;

[0067] 40, the electrical device;

[0068] 41. Driving motor; 42. Frame; 43. Wheel. Specific implementation manner

[0069] In order to make the purpose, technical solution and advantages of the present application clearer, the following further details the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0070] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for convenience of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. Terms "first" and "second" are only for convenience of description purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0071] In order to illustrate the technical solution provided by the present application, the following details are given in combination with specific drawings and embodiments.

[0072] Currently, in order to meet the requirements of high endurance capacity, electric vehicles generally use multiple battery cells combined into a battery to store and supply electricity through the battery, so as to store a large amount of electricity to ensure high endurance capacity. Among them, cylindrical battery cells have the advantages of high capacity, long cycle life, wide operating temperature range, etc. Therefore, the battery composed of cylindrical battery cells is widely used in new energy products.

[0073] In a cylindrical battery cell, a first end cap and an electrode assembly are generally connected through a transfer piece to achieve electrical connection between the first end cap and the first tab of the electrode assembly. When assembling through the transfer piece, the transfer piece needs to be bent, and the transfer piece is folded to adapt to the assembly space between the end cap and the electrode assembly. However, when the transfer piece is bent, the bent position is prone to breakage, resulting in the inability to achieve electrical connection between the electrode assembly and the end cap, thereby affecting the product yield of the cylindrical battery cell.

[0074] Based on the above considerations, an embodiment of the present application provides a cylindrical battery cell. The first tab of the electrode assembly and the first end cap of the cylindrical battery cell are connected through a first adapter tab. Since the first adapter tab is provided with a main body portion connected to the first end cap and a protruding portion connected to the first tab of the electrode assembly, and there is a height difference between the main body portion and the protruding portion in the height direction of the housing, that is, the protruding portion protrudes from the side of the main body portion facing the first end cap, a distance is formed between the main body portion and the protruding portion in the axial direction of the cylindrical battery cell, thereby meeting the requirement of spaced arrangement between the electrode assembly and the first end cap, and there is no need to bend the first adapter tab, ensuring the integrity and self-strength of the first adapter tab, reducing the risk of bending and breaking, and improving the electrical connection stability between the electrode assembly and the first end cap. Among them, the cylindrical battery cell includes but is not limited to lithium-ion batteries, and may also be sodium-ion batteries, for example. Moreover, the cylindrical battery cell obtained by application production is used for production and manufacturing to obtain a battery, and the battery is applied to corresponding electrical equipment to provide a stable power supply capacity for the electrical load of the electrical equipment.

[0075] As Figures 1 to 22 shown, an embodiment of the present application provides a cylindrical battery cell 20. As Figure 1 , Figure 11 and Figure 16 shown, the cylindrical battery cell 20 includes a housing 21, an electrode assembly 22, a first end cap 23, and a first adapter tab 10. The housing 21 is provided with an accommodation space 212, and the housing 21 has a first opening 211, and the first opening 211 communicates with the accommodation space 212. The electrode assembly 22 is installed in the accommodation space 212, and the electrode assembly 22 has a first tab 220. The first end cap 23 covers the first opening 211 so that the accommodation space 212 forms a closed space, and the first end cap 23 is insulated from the housing 21. The first adapter tab 10 is plate-shaped, and the first adapter tab 10 includes a main body portion 11 and a protruding portion 12. The main body portion 11 is connected to the first tab 220, and there is a height difference between the main body portion 11 and the protruding portion 12 in the height direction of the housing 21, that is, the protruding portion 12 protrudes from the side of the main body portion 11 facing the first end cap 23, so that a distance is formed between the main body portion 11 and the protruding portion 12 in the axial direction of the cylindrical battery cell 20, and the protruding portion 12 is connected to the first end cap 23.

[0076] In the cylindrical battery cell 20, the first tab 220 of the electrode assembly 22 is electrically connected to the main body portion 11 of the first adapter tab 10, and the protruding portion 12 of the first adapter tab 10 is electrically connected to the first end cap 23. When the cylindrical battery cell 20 discharges, the current sequentially flows through the first tab 220, the main body portion 11, the protruding portion 12, and the first end cap 23.

[0077] Specifically, the specific shape of the housing 21 is cylindrical, and the size of the housing 21 can be determined according to the specific size of the electrode assembly 22. The material of the housing 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0078] Among them, the "sealed space" in "the first end cap 23 covers the first opening 211 so that the accommodation space 212 is formed into a sealed space" means that the dustproof and waterproof performance can be achieved, and the accommodation space 212 is airtight and impermeable.

[0079] When manufacturing the cylindrical battery cell 20 by using the first adapter piece 10 provided in the present application, since the first adapter piece 10 is provided with a protruding portion 12 for connecting with the first end cap 23 and a main body portion 11 for connecting with the first tab 220 of the electrode assembly 22, and the protruding portion 12 protrudes on the side of the main body portion 11 facing the first end cap 23, a distance is formed between the protruding portion 12 and the main body portion 11 in the axial direction of the cylindrical battery cell 20, which enables the first tab 220 and the first end cap 23 to be arranged at intervals in the accommodation space 212, thus meeting the requirement of the interval arrangement between the electrode assembly 22 and the first end cap 23. Moreover, the present application uses the first adapter piece 10 to transfer the electrode assembly 22 and the first end cap 23. Compared with the related art, the first adapter piece 10 does not need to be bent, ensuring the integrity and self-strength of the first adapter piece 10, and there is no risk of bending and breaking, and the stable electrical connection between the electrode assembly 22 and the first end cap 23 is always maintained.

[0080] In some embodiments of the present application, the first end cap 23 can be a separate sheet-shaped cover plate. At this time, the first end cap 23 is connected to the protruding portion 12 to achieve electrical connection, that is, the first end cap 23 serves as the positive terminal of the cylindrical battery cell as a whole, and moreover, the first end cap 23 is insulated from the housing 21.

[0081] In some other embodiments of the present application, the first end cap 23 can be a combined end cap. The first end cap 23 includes a cover plate, a pole column, an insulating member, a sealing ring, etc. At this time, the cover plate covers the first opening 211, and an insulating and sealing arrangement is formed between the cover plate and the pole column through the insulating member and the sealing ring. The pole column is connected to the protruding portion 12, that is, the pole column serves as the positive terminal for connecting with an external electrical device.

[0082] The main body portion 11 and the first tab 220 are preferably welded, and the protruding portion 12 and the first end cap 23 are preferably welded. When welding between the first end cap 23 and the protruding portion 12, a part of the heat generated by welding is transferred from the first end cap 23 to the protruding portion 12, then the protruding portion 12 transfers heat to the main body portion 11, and then the heat can be transferred from the main body portion 11 to the first tab 220, which slows down the heat transfer speed. Moreover, most of the heat is transferred through the air gap formed between the first tab 220 and the first end cap 23, greatly reducing the efficiency of heat transfer to the first tab 220. Therefore, the heat generated by welding can be reduced from being transferred to the electrode assembly 22, which is beneficial to reducing the probability of the heat generated by welding causing burning damage to the electrode assembly 22, and then helps to improve the product yield of the cylindrical battery cell 20.

[0083] In the cylindrical battery cell of the present application, the first adapter piece 10 is integrally disc-shaped to adapt to the cross-sectional shape of the cylindrical battery cell. Among them, the so-called "disc-shaped" can be a regular disc shape, a disc shape that is continuously arranged in the circumferential direction; or an irregular structure and is integrally disc-shaped, and there may be a notch in the circumferential direction, so that the first adapter piece 10 is not continuous in the circumferential direction but is still disc-shaped as a whole.

[0084] Furthermore, the main body portion 11 and the protruding portion 12 are arranged radially, or the main body portion 11 and the protruding portion 12 are arranged circumferentially.

[0085] In some embodiments of the present application, such as Figures 6 to 10 、 Figures 12 to 14 、 Figures 17 to 19As shown, the protruding portion 12 is integrally in a ring structure, and the main body portion 11 is integrally in a ring structure. The main body portion 11 and the protruding portion 12 are arranged with the inner and outer rings nested. Moreover, the axis of the ring structure formed by the protruding portion 12 as a whole and the axis of the ring structure formed by the main body portion 11 as a whole are coaxially arranged or relatively eccentrically arranged. On the first adapter piece 10, there is actually a center point position. When the axis of the ring structure formed by the protruding portion 12 as a whole and the axis of the ring structure formed by the main body portion 11 as a whole are coaxially arranged, both the axis of the ring structure formed by the protruding portion 12 as a whole and the axis of the ring structure formed by the main body portion 11 as a whole pass through the center point of the first adapter piece 10, and both the axis of the ring structure formed by the protruding portion 12 as a whole and the axis of the ring structure formed by the main body portion 11 as a whole are perpendicular to the plane where the first adapter piece 10 is located. Or, when the axis of the ring structure formed by the protruding portion 12 as a whole and the axis of the ring structure formed by the main body portion 11 as a whole are relatively eccentrically arranged, and when the axis of the ring structure formed by the protruding portion 12 as a whole passes through the center point of the first adapter piece 10, the axis of the ring structure formed by the main body portion 11 as a whole is eccentrically arranged relative to the axis of the ring structure formed by the protruding portion 12 as a whole; or, when the axis of the ring structure formed by the main body portion 11 as a whole passes through the center point of the first adapter piece 10, the axis of the ring structure formed by the protruding portion 12 as a whole is eccentrically arranged relative to the axis of the ring structure formed by the main body portion 11 as a whole. In this way, the design structure of the first adapter piece 10 is simplified, so that the first adapter piece 10 can be easily manufactured, and the production efficiency is improved.

[0086] Among them, "the ring structure formed by the protruding portion 12 as a whole and the ring structure formed by the main body portion 11 as a whole are coaxially arranged" can be that the ring structure formed by the protruding portion 12 as a whole coincides with the ring structure formed by the main body portion 11 as a whole; it can also be that the ring structure formed by the protruding portion 12 as a whole and the ring structure formed by the main body portion 11 as a whole are distributed inside and outside, that is, the ring structure formed by the protruding portion 12 as a whole surrounds the ring structure formed by the main body portion 11 as a whole, or the ring structure formed by the main body portion 11 as a whole surrounds the ring structure formed by the protruding portion 12 as a whole.

[0087] As a preferred embodiment, the axis of the ring structure formed by the protruding portion 12 as a whole and the axis of the ring structure formed by the main body portion 11 as a whole are coaxially arranged.

[0088] In some embodiments of the present application, the protruding portion 12 and the main body portion 11 are integrally formed. For example, the first adapter piece 10 is manufactured by a blanking process. Since the center of the circle formed by the circumferential surrounding of the protruding portion 12 in the first adapter piece 10 and the center of the circle formed by the circumferential surrounding of the main body portion 11 are concentrically arranged, the structure of the first adapter piece 10 is simplified. Therefore, the simplified structure can reduce the difficulty of the blanking process, thereby improving the production efficiency.

[0089] In some embodiments of the present application, the protruding portions 12 and the main body portion 11 are alternately connected in the circumferential direction. The protruding portion 12 can be one or more; the main body portion 11 can be one or more. The protruding portion 12 and the main body portion 11 can be alternately connected to form an arc-shaped structure; or, the protruding portion 12 and the main body portion 11 can be alternately and end-to-end connected to form a closed circular structure.

[0090] In some embodiments of the present application, as Figures 6 to 10 shown, the number of the protruding portions 12 is multiple, and multiple protruding portions 12 are all welded to the first end cap 23, improving the welding strength between the first adapter piece 10 and the first end cap 23 and improving the connection stability. As Figures 6 to 10 shown, the number of the main body portions 11 is multiple, and multiple main body portions 11 are all welded to the first tab 220 of the electrode assembly 22, improving the welding strength between the first adapter piece 10 and the first tab 220 and improving the connection stability.

[0091] As a preferred embodiment, the number of the protruding portions 12 is multiple, and the number of the main body portions 11 is multiple. Multiple protruding portions 12 and multiple main body portions 11 are alternately connected end-to-end in sequence in the circumferential direction to form a closed circular structure. Multiple protruding portions 12 are all welded to the first end cap 23, improving the welding strength between the first adapter piece 10 and the first end cap 23 and improving the connection stability. Moreover, multiple main body portions 11 are all welded to the first tab 220 of the electrode assembly 22, improving the welding strength between the first adapter piece 10 and the first tab 220 and improving the connection stability. In this way, a more stable connection can be always maintained between the first end cap 23 and the first tab 220, and a stable electrical connection performance can be maintained. Also, during the welding process of the protruding portions 12 and the main body portions 11, each protruding portion 12 and each main body portion 11 are welded one by one and dispersedly. In this way, the heat generated during the welding of each protruding portion 12 and each main body portion 11 is dispersed, avoiding heat concentration, which helps to reduce the probability of the heat generated by welding causing burning damage to the electrode assembly 22. In this embodiment, the distribution structure of the protruding portion 12 and the main body portion 11 is simple. When opening a die-cutting die, only by alternately arranging concave and convex structures at intervals on the end of the punch on the same circumference can the die opening be completed. The die opening is simple and fast. Moreover, the processing efficiency of processing the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on the blank plate.

[0092] In some embodiments of the present application, as Figures 12 to 14 、 Figures 17 to 19As shown, the protruding portion 12 is disposed on the radially outer side of the main body portion 11. In this embodiment, the protruding portion 12 and the main body portion 11 are arranged in a concentric circle distribution, that is, the annular structure formed by the protruding portion 12 as a whole and the annular structure formed by the main body portion 11 as a whole are coaxially arranged, which simplifies the design structure of the first adapter piece 10, so that the first adapter piece 10 can be easily manufactured, improving the production efficiency.

[0093] Specifically, in some embodiments of the present application, such as Figure 12 and Figure 13 As shown, the main body portion 11 is a circumferentially continuous annular structure, and the protruding portion 12 is a circumferentially continuous annular structure. The protruding portion 12 is connected to the outer ring of the main body portion 11, that is, the annular structure formed by the protruding portion 12 as a whole and the annular structure formed by the main body portion 11 as a whole are coaxially arranged. In this way, the annular main body portion 11 can quickly align with the first tab 220 of the electrode assembly 22 and then be welded. Similarly, the annular protruding portion 12 can quickly align with the first end cap 23 and then be welded, thereby improving the working efficiency of welding. When opening the die-cutting die, only by setting the concave and convex structures of concentric circles inside and outside at the end of the punch, the die opening can be completed, and the die opening is simple and fast. Moreover, the processing efficiency of the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on the blank plate.

[0094] Or, in some embodiments of the present application, such as Figure 14 As shown, the main body portion 11 is a circumferentially continuous annular structure. The annular main body portion 11 can quickly align with the first tab 220 of the electrode assembly 22 and then be welded, thereby improving the working efficiency of welding. Further, as Figure 14 As shown, the number of the protruding portions 12 is multiple, and the multiple protruding portions 12 are all connected to the outer ring of the main body portion 11. Moreover, two adjacent protruding portions 12 are arranged at intervals, that is, the multiple protruding portions 12 form a discontinuous annular structure. The multiple protruding portions 12 are all welded to the first end cap 23, improving the connection stability between the first adapter piece 10 and the first end cap 23. And during the welding process of the protruding portions 12, the individual protruding portions 12 are welded separately, so that the heat generated during the welding of each protruding portion 12 is dispersed, avoiding heat concentration, which helps to reduce the probability of the heat generated by welding causing burning damage to the electrode assembly 22. When opening the die-cutting die, only by setting the concave and convex structures of concentric circles inside and outside at the end of the punch and setting the punching edges at the bottom of the grooves corresponding to the protruding portions 12 of the punch to punch and form multiple spaced protruding portions 12, the die opening is completed, and the die opening is simple and fast. Moreover, the processing efficiency of the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on the blank plate.

[0095] Alternatively, in some embodiments of the present application, such as Figure 15 shown, the protruding portion 12 is a circumferentially continuous annular structure. The annular protruding portion 12 in the shape of a ring can be quickly aligned with the first end cap 23 and then welded, thereby improving the working efficiency of welding. Further, as Figure 15 shown, the number of the main body portions 11 is multiple. The protruding portion 12 is connected to the inner edges of the multiple main body portions 11, and two adjacent main body portions 11 are spaced apart. That is, the multiple main body portions 11 form a discontinuous ring structure. The multiple main body portions 11 are all welded to the first tab 220 of the electrode assembly 22, improving the connection stability between the first adapter piece 10 and the first tab 220. Moreover, during the welding process of the main body portions 11, the individual main body portions 11 are welded separately, so that the heat generated during the welding of each main body portion 11 is dispersed, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the electrode assembly 22. When opening a die-cutting mold, only a concavo-convex structure of concentric circles inside and outside needs to be provided at the end of the punch, and a punching edge is provided on the top surface of the punch corresponding to the protrusion of the main body portion 11 to punch and form multiple spaced-apart main body portions 11, thus completing the mold opening. The mold opening is simple and fast. Moreover, the processing efficiency of processing the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on a blank plate.

[0096] In some embodiments of the present application, such as Figures 17 to 19 shown, the main body portion 11 circumferentially surrounds the protruding portion 12. In this embodiment, the protruding portion 12 and the main body portion 11 adopt a concentric circle distribution method inside and outside, that is, the annular structure formed by the protruding portion 12 as a whole and the annular structure formed by the main body portion 11 as a whole are coaxially arranged, simplifying the design structure of the first adapter piece 10, so that the first adapter piece 10 can be easily manufactured and the production efficiency is improved.

[0097] Specifically, in some embodiments of the present application, such as Figure 17 shown, both the protruding portion 12 and the main body portion 11 are complete and continuous annular structures, and the two annular structures are coaxially arranged. The main body portion 11 is connected to the outer ring of the protruding portion 12. In this way, the annular protruding portion 12 in the shape of a ring can be quickly aligned with the first end cap 23 and then welded. Similarly, the annular main body portion 11 in the shape of a ring can be quickly aligned with the first tab 220 of the electrode assembly 22 and then welded, thereby improving the working efficiency of welding. When opening a die-cutting mold, only a concavo-convex structure of concentric circles inside and outside needs to be provided at the end of the punch to complete the mold opening. The mold opening is simple and fast. Moreover, the processing efficiency of processing the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on a blank plate.

[0098] Or, in some embodiments of the present application, such as Figure 18As shown, the main body portion 11 is a circumferentially continuous annular structure. The annular main body portion 11 in the shape of a ring can be quickly aligned with the first tab 220 of the electrode assembly 22 and then welded, thereby improving the working efficiency of welding. Further, as Figure 18 shown, the number of the protruding portions 12 is multiple, and the multiple protruding portions 12 form a discontinuous annular structure. The main body portion 11 is connected to the outer edges of the multiple protruding portions 12. Moreover, two adjacent protruding portions 12 are arranged at intervals. The multiple protruding portions 12 are all welded to the first end cap 23, improving the connection stability between the first adapter piece 10 and the first end cap 23. And during the welding process of the protruding portions 12, each protruding portion 12 is welded dispersedly, so that the heat generated during the welding of each protruding portion 12 is dispersed, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the electrode assembly 22. When opening a die-cutting mold, only an uneven structure of inner and outer concentric circles needs to be set at the end of the punch, and a punching edge is set at the bottom of the groove of the punch corresponding to the groove of the protruding portion 12 to punch and form multiple spaced protruding portions 12, thus completing the mold opening. The mold opening is simple and fast. Moreover, the processing efficiency of processing the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on a blank plate.

[0099] Or, in some embodiments of the present application, as Figure 19 shown, the protruding portion 12 is a circumferentially continuous annular structure. The annular protruding portion 12 in the shape of a ring can be quickly aligned with the first end cap 23 and then welded, thereby improving the working efficiency of welding. Further, as Figure 19 shown, the number of the main body portions 11 is multiple, and the multiple main body portions 11 form a discontinuous annular structure. The multiple main body portions 11 are all connected to the outer ring of the protruding portion 12. Moreover, two adjacent main body portions 11 are arranged at intervals. The multiple main body portions 11 are all welded to the first tab 220 of the electrode assembly 22, improving the connection stability between the first adapter piece 10 and the first tab 220. And during the welding process of the main body portions 11, each main body portion 11 is welded dispersedly, so that the heat generated during the welding of each main body portion 11 is dispersed, avoiding heat concentration, and thus helping to reduce the probability of the heat generated by welding causing burning damage to the electrode assembly 22. When opening a die-cutting mold, only an uneven structure of inner and outer concentric circles needs to be set at the end of the punch, and a punching edge is set at the top surface of the protrusion of the punch corresponding to the main body portion 11 to punch and form multiple spaced main body portions 11, thus completing the mold opening. The mold opening is simple and fast. Moreover, the processing efficiency of processing the first adapter piece 10 is relatively high, and the first adapter piece 10 can be directly formed by punching on a blank plate.

[0100] In some other embodiments of the present application, the annular structure formed by the protruding portion 12 as a whole and the annular structure formed by the main body portion 11 as a whole may also be arranged with different axes, that is, the axis of the annular structure formed by the protruding portion 12 as a whole is parallel to the circumferential direction of the annular structure formed by the main body portion 11 as a whole but does not coincide, that is, they are relatively eccentrically arranged.

[0101] In order to ensure the welding strength between the first adapter piece 10 and the first tab 220 of the electrode assembly 22 and meet the over-current requirement, therefore, in some embodiments of the present application, as Figures 7 to 10 shown, the main body portion 11 includes a first non-welding area and a first welding area 111, and the first welding area 111 is used for welding with the first tab 220. Among them, the shape of the first welding area 111 includes one or several combinations of arc, circle, ellipse, square, and line segment. In this way, by specially providing the first welding area 111 on the main body portion 11, the welding position between the main body portion 11 and the first tab 220 can be clearly and accurately marked, so as to quickly align the first tab 220 with the main body portion 11, and then perform the welding operation, improving the welding efficiency. And, by welding the first welding area 111 with the first tab 220 of the electrode assembly 22, the welding strength between the first adapter piece 10 and the first tab 220 of the electrode assembly 22 can meet the requirements of the connection strength, and can meet the over-current requirement, ensuring the normal electrical connection between the first tab 220 and the main body portion 11.

[0102] In some embodiments of the present application, the first welding area 111 may but is not limited to protrude towards the first tab 220 relative to the first non-welding area, as Figure 8 shown. The protruding first welding area 111 can not only clearly and accurately mark the welding position between the main body portion 11 and the first tab 220, so as to quickly align the first tab 220 with the main body portion 11, and then perform the welding operation, improving the welding efficiency, but also can correspondingly shorten the length of the first tab 220, saving the usage amount of the electrode material.

[0103] In some other embodiments of the present application, the first welding area 111 may also be a region range directly outlined on the surface of the main body portion 11, and this way of marking the first welding area 111 is very convenient and fast.

[0104] In some embodiments of the present application, the first tab 220 has a first welding portion 221, and the first welding area 111 is welded to the first welding portion 221 of the first tab 220, as Figures 3 to 5As shown, the area of the first welding region 111 is smaller than the area of the first welding part 221. In this way, when the main body 11 of the first adapter piece 10 is placed on the first tab 220, the main body 11 can be quickly aligned with the first tab 220 and then welded, improving the welding work efficiency.

[0105] The electrode assembly 22 is a component that undergoes an electrochemical reaction in the cylindrical battery cell 20. As Figure 4 and Figure 5 shown, the electrode assembly 22 is laminated in sequence with the first electrode plate 227, the second separator 226, the second electrode plate 228, and the first separator 225, and then wound and formed. A first tab 220 is provided on one side of the second electrode plate 228, and a first welding part 221 is provided on the first tab 220. Further, a second tab 223 is provided on one side of the first electrode plate 227, and a third welding part 224 is provided on the second tab 223. That is, the portions of the first electrode plate 227 and the second electrode plate 228 having active materials constitute the main part of the electrode assembly 22 that undergoes an electrochemical reaction. During the charge and discharge process of the battery, the active materials of the first electrode plate 227 and the second electrode plate 228 react with the electrolyte. The portions of the first electrode plate 227 and the second electrode plate 228 that do not have active materials respectively constitute the second tab 223 and the first tab 220. Among them, both the first separator 225 and the second separator 226 are insulating films. After the electrode assembly 22 is wound and formed, the first separator 225 is located on the outermost layer. In this way, when the electrode assembly 22 is placed into the accommodation space 212 of the housing 21, the side wall of the electrode assembly 22 and the inner wall of the housing 21 can be insulated by the first separator 225.

[0106] Further, in order to ensure the welding strength between the first adapter piece 10 and the first end cap 23 and meet the overcurrent requirement, therefore, in some embodiments of the present application, as Figures 7 to 10 shown, the protruding part 12 includes a second non-welding region and a second welding region 121, and the second welding region 121 is used for welding with the first end cap 23. Among them, the second welding region 121 includes one or several combinations of an arc shape, a circular shape, an oval shape, a square shape, a line segment shape, etc. In this way, by specially providing the second welding region 121 on the protruding part 12, the welding position between the protruding part 12 and the first end cap 23 can be clearly and accurately marked, so as to quickly align the protruding part 12 and the first end cap 23 and then perform the welding operation, improving the welding efficiency. And, by welding the second welding region 121 with the first end cap 23, the welding strength between the first adapter piece 10 and the first end cap 23 can meet the requirement of the connection strength, and can meet the overcurrent requirement, ensuring the normal electrical connection between the first end cap 23 and the protruding part 12.

[0107] In some embodiments of the present application, the second welding area 121 may, but is not limited to, protrude towards the first end cap 23 relative to the second non-welding area, as Figure 8 shown. In this way, the protruding second welding area 121 can not only clearly and accurately identify the welding position between the protrusion 12 and the first end cap 23, so as to quickly align the protrusion 12 and the first end cap 23 and then perform the welding operation, improving the welding efficiency, but also enable better contact between the main body 11 and the first end cap 23, thus facilitating the welding operation.

[0108] In some other embodiments of the present application, the second welding area 121 may also be a region range directly outlined on the surface of the protrusion 12. In this way, the method of identifying the second welding area 121 is very convenient and fast.

[0109] In some embodiments of the present application, as Figures 6 to 10 , Figures 12 to 15 , Figures 17 to 19 shown, the first adapter piece 10 is provided with a first liquid injection hole 13, and both the protrusion 12 and the main body 11 surround the first liquid injection hole 13. After the welding operation on the first adapter piece 10 is completed, electrolyte is injected into the cylindrical battery cell 20 through the first liquid injection hole 13, so that the electrolyte wets the electrode assembly 22. Specifically, the first liquid injection hole 13 is formed by the protrusion 12 and / or the main body 11 surrounding it. In the present application, the first liquid injection hole 13 is opened at the middle position of the first adapter piece 10, so that the setting of the first liquid injection hole 13 does not affect the mechanical strength of the first adapter piece 10 itself and is convenient for the liquid injection operation.

[0110] In some embodiments of the present application, as Figure 12 and Figure 13 shown, the first adapter piece 10 has the protrusion 12 circumferentially surrounding the main body 11, and the main body 11 is set as a complete circular shape, and the protrusion 12 is connected to the outer circle of the main body 11. For the first adapter piece 10, as Figure shown, the diameter of the first liquid injection hole 13 is d1, the inner circle diameter of the first welding area 111 on the main body 11 is d2, the outer circle diameter of the first welding area 111 on the main body 11 is d3, and the inner circle diameter of the protrusion 12 is d4. Among them, d1≤d2<d3≤d4. In this way, the effective area of the main body 11 can be fully utilized to design the first welding area 111. Thus, by welding the first welding area 111 with the first pole ear 220 of the electrode assembly 22, the welding strength between the first adapter piece 10 and the first pole ear 220 of the electrode assembly 22 can meet the requirements of the connection strength, and can meet the over-current demand, ensuring normal electrical connection between the first pole ear 220 and the main body 11. Specifically, 0.5mm≤d2-d1, 0.5mm≤d4-d3.

[0111] In the present application, ​ the shown cylindrical battery cell 20, ​ the shown cylindrical battery cell 20, and ​ the shown cylindrical battery cell 20 all adopt first adapter plates 10 with different design structures. Optionally, ​ the shown cylindrical battery cell 20 adopts ​ the shown first adapter plate 10, ​ the shown cylindrical battery cell 20 adopts ​ the shown first adapter plate 10, and ​ the shown cylindrical battery cell 20 adopts ​ the shown first adapter plate 10.

[0112] In some embodiments of the present application, as ​ , ​ , ​ , ​ shown, the first end cap 23 is provided with a second liquid injection hole 231, and the second liquid injection hole 231 and the first liquid injection hole 13 of the first adapter plate 10 are arranged opposite to each other along the axis of the first opening 211. That is, the second liquid injection hole 231 is opened at the middle position of the first end cap 23, so that the setting of the second liquid injection hole 231 does not affect the mechanical strength of the first end cap 23 itself and is convenient for liquid injection operation. As ​ shown, after the liquid injection operation is completed, the plug block 26 is inserted into the second liquid injection hole 231 to block the second liquid injection hole 231, and then the screw cap 25 is screwed and installed on the first end cap 23 and the screw cap 25 completely covers the plug block 26, thereby preventing the plug block 26 from coming out of the second liquid injection hole 231 and ensuring that the electrolyte in the cylindrical battery cell 20 does not leak.

[0113] In some embodiments of the present application, as ​ , ​ , ​ shown, the cylindrical battery cell 20 further includes an insulating assembly 24, and the insulating assembly 24 is arranged between the first end cap 23 and the housing 21. Through the insulating assembly 24, insulation is provided between the first end cap 23 and the housing 21 to ensure that no short circuit occurs between the first end cap 23 and the housing 21 and to ensure that the cylindrical battery cell 20 can be normally electrically connected. Among them, as ​ , ​ , ​As shown, the insulating component 24 includes a first insulating member 241 and a second insulating member 242. The first insulating member 241 and the second insulating member 242 are oppositely arranged to cover the circumferential edge of the first end cap 23. Moreover, the circumferential side walls of the first insulating member 241 and the second insulating member 242 are abutted against the inner wall of the housing 21, so that insulation is achieved between the first end cap 23 and the housing 21. By using the assembly method of laminating the first insulating member 241 and the second insulating member 242 up and down to cover the circumferential edge of the first end cap 23, the first insulating member 241 and the second insulating member 242 can quickly complete the covering of the circumferential edge of the first end cap 23, improving the assembly efficiency.

[0114] In some embodiments of the present application, the housing 21 is a cylindrical housing 21, such as ​ and ​ As shown, the housing 21 is provided with a rolling groove structure 213 recessed towards the accommodation space 212, and the rolling groove structure 213 is arranged close to the first opening 211. After the electrode assembly 22 is placed into the accommodation space 212, the rolling groove structure 213 is roll-pressed circumferentially on the outer side of the housing 21, so that the rolling groove structure 213 abuts against the shoulder 222 of the electrode assembly 22, that is, the electrode assembly 22 is arranged on the side of the rolling groove structure 213 away from the first opening 211. Moreover, an insulating ring glue is sleeved on the first tab 220 of the electrode assembly 22 after winding and forming, and the insulating ring glue insulates between the rolling groove structure 213 and the first tab 220 at the position of the shoulder 222 of the electrode assembly 22. Further, one of the first insulating member 241 and the second insulating member 242 abuts against the side of the rolling groove structure 213 away from the electrode assembly 22 (as shown in the cylindrical battery cell 20 in ​ it is the second insulating member 242 that abuts against the side of the rolling groove structure 213 away from the electrode assembly 22), that is to say, the rolling groove structure 213 supports the circumferential edge of the first end cap 23, so that the first end cap 23 will not collapse into the accommodation space 212. After the first end cap 23 is installed, the housing 21 at the first opening 211 is provided with a circumferential flanging 214, and the circumferential flanging 214 buckles the other of the first insulating member 241 and the second insulating member 242 (as shown in the cylindrical battery cell 20 in ​ it is the first insulating member 241 that is buckled by the circumferential flanging 214, that is, the first insulating member 241 is arranged between the circumferential flanging 214 and the circumferential edge of the first end cap 23), so that the first end cap 23 cannot be separated from the housing 21, ensuring that the first end cap 23 is firmly and stably installed at the first opening 211. Moreover, the assembled first insulating member 241 and the second insulating member 242 form a sealing setting for the gap between the circumferential edge of the first end cap 23 and the circumferential inner wall of the housing 21, thus achieving good dust-proof and waterproof performance. At this time, the accommodation space 212 is a closed space.

[0115] When a thermal runaway occurs during the charging and discharging of the cylindrical battery cell 20, high-temperature flue gas is generated inside the cylindrical battery cell 20. If the high-temperature and high-pressure flue gas cannot be discharged in time for pressure relief, the internal pressure of the cylindrical battery cell 20 will continue to rise (i.e., in a high-pressure state), and ultimately may cause the cylindrical battery cell 20 to explode, which is very dangerous. Therefore, in some embodiments of the present application, as ​ and ​ and ​ and ​ shown, the first end cap 23 is further provided with an explosion-proof notch 232. In this way, when the high-temperature and high-pressure flue gas inside the cylindrical battery cell 20 reaches the preset pressure threshold of the explosion-proof notch 232, the explosion-proof notch 232 ruptures, thereby realizing pressure relief inside the cylindrical battery cell 20 and preventing the cylindrical battery cell 20 from exploding.

[0116] Among them, the explosion-proof notch 232 can be in an arc shape, and the explosion-proof notch 232 is arranged around the second liquid injection hole 231. Further, as ​ shown, the first end cap 23 has a second welding portion 234, and the second welding portion 234 is welded to the second welding area 121 of the protruding portion 12 of the first adapter plate 10. The second welding portion 234 surrounds the explosion-proof notch 232, that is, the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding portion 234. In this way, the surface position of the first end cap 23 can be fully utilized, and the structural positions of the second liquid injection hole 231, the explosion-proof notch 232, and the second welding portion 234 can be reasonably designed and distributed on the limited surface position of the first end cap 23. [[ID=]14]

[0117] In some other embodiments of the present application, the explosion-proof notch 232 can also be arranged around the second welding portion 234. Since the second welding portion 234 is welded to the protruding portion 12, therefore, compared with the way that the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding portion 234, when the explosion-proof notch 232 is arranged around the second welding portion 234, the preset pressure threshold of the explosion-proof notch 232 is higher. Therefore, according to the actual situation of the cylindrical battery cell 20, the way of arranging around the second welding portion 234 can be selected, or the way that the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding portion 234 can be selected.

[0118] In the embodiments of the present application, the first end cap 23 preferably adopts the way that the explosion-proof notch 232 is arranged between the second liquid injection hole 231 and the second welding portion 234.

[0119] In some embodiments of the present application, as ​ and [[ID=?25]] ​ and ​ and ​As shown, a circumferential installation area 233 is further provided in the circumferential edge area of the first end cover 23. 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. Moreover, the second welding part 234 is located between the explosion-proof notch 232 and the circumferential installation area 233.

[0120] In some embodiments of the present application, as ​ shown, the outer edge diameter of the explosion-proof notch 232 is D1, the inner edge diameter of the second welding part 234 is D2, the outer edge diameter of the second welding part 234 is D3, and the inner edge diameter of the circumferential installation area 233 is D4. Among them, D1≤D2<D3≤D4. In this way, the structural position of the second welding part 234 can be designed by making full use of the effective area of the first end cover 23. Thus, by welding the second welding part 234 with the protruding part 12, the welding strength between the first end cover 23 and the first adapter piece 10 can meet the requirements of the connection strength, and the over-current requirement can be satisfied, ensuring the normal electrical connection between the protruding part 12 and the first end cover 23. Specifically, 0.5mm≤D2-D1, 0.5mm≤D4-D3.

[0121] In some embodiments of the present application, the housing 21 further has a second opening, which is disposed opposite to the first opening 211. The electrode assembly 22 further has a second tab 223. The cylindrical battery cell 20 further includes a second end cap and a second adapter piece. The second end cap covers the second opening. Among them, the second adapter piece has the same structure as the first adapter piece 10. The main body portion of the second adapter piece is connected to the second end cap, and the protruding portion of the second adapter piece is connected to the third welding portion 224 of the second tab 223. In this embodiment, "the second adapter piece has the same structure as the first adapter piece 10" means that the structures and shapes of the various components included in the second adapter piece and the arrangement positions between the various component structures are similar to or the same as those of the various component structures and their shapes and the arrangement positions between the various component structures included in the first adapter piece 10. However, the sizes of the structures and shapes of the various components included in the second adapter piece and the intervals between the arrangement positions of the various component structures may be the same or different from those of the structures and shapes of the various components included in the first adapter piece 10 and the intervals between the arrangement positions of the various component structures. That is to say, the second adapter piece also includes a protruding portion 12 and a main body portion 11. The protruding portion 12 is connected to the second end cap, and the protruding portion 12 protrudes from the side of the main body portion 11 facing the second end cap. The main body portion 11 is connected to the second tab. Moreover, the shape of the protruding portion 12 of the second adapter piece is the same as the shape of the protruding portion 12 of the first adapter piece 10, the shape of the main body portion 11 of the second adapter piece is the same as the shape of the main body portion 11 of the first adapter piece 10, and the positional relationship between the protruding portion 12 and the main body portion 11 of the second adapter piece is the same as the positional relationship between the protruding portion 12 and the main body portion 11 of the first adapter piece 10. However, the sizes of the protruding portion 12 and the main body portion 11 of the second adapter piece may be the same as or different from those of the protruding portion 12 and the main body portion 11 of the first adapter piece 10. In this embodiment, since the second adapter piece is provided with a protruding portion 12 for connecting to the second end cap and a main body portion 11 for connecting to the second tab 223 of the electrode assembly 22, and the main body portion 11 protrudes from the side of the protruding portion 12 facing the second end cap, a distance is formed between the protruding portion 12 and the main body portion 11 in the axial direction of the cylindrical battery cell 20. This enables the second tab 223 and the second end cap to be spaced apart in the accommodation space 212, thus meeting the requirement of the spaced arrangement between the electrode assembly 22 and the second end cap. Moreover, compared with the related art, the second adapter piece does not need to be bent, ensuring the integrity and self-strength of the second adapter piece, and there is no risk of bending and breaking, and the stable electrical connection between the electrode assembly 22 and the second end cap is always maintained.

[0122] In some embodiments of the present application, the second end cap may be a separate sheet-shaped cover plate. At this time, the second end cap is not only connected to the protruding portion 12 of the second adapter piece to achieve electrical connection, and the second end cap as a whole serves as the negative terminal of the cylindrical battery cell, but also, the second end cap needs to be assembled with the second opening to form a seal. Alternatively, in some other embodiments of the present application, the second end cap may be a combined end cap. The second end cap includes a cover plate, a pole column, an insulating member, a sealing ring, etc. At this time, the cover plate covers the second opening, and a sealing arrangement is formed between the cover plate and the second opening through the sealing ring, and an insulating arrangement is formed between the cover plate and the housing 21 through the insulating member. The pole column is connected to the inner side of the cover plate, and the pole column is connected to the protruding portion 12 of the second adapter piece, and the cover plate serves as the negative terminal for connecting to an external electrical device.

[0123] The first end cap 23 and the second end cap refer to components that respectively cover the first opening 211 and the second opening of the housing 21 to isolate the internal environment of the cylindrical battery cell 20 from the external environment. Optionally, the first end cap 23 and the second end cap can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the first end cap 23 and the second end cap are not easily deformed when being squeezed and collided, enabling the cylindrical battery cell 20 to have higher structural strength and improved safety performance. The materials of the first end cap 23 and the second end cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, conductive plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0124] According to a second aspect of the present application, a battery 30 is provided, as ​ shown. Among them, the battery 30 includes the cylindrical battery cell 20 as described above, and the cylindrical battery cells 20 are distributed in an array.

[0125] As ​ shown, the battery 30 further includes a box housing 31, and the box housing 31 forms an assembly space 313. Among them, the box housing 31 includes a box main body 311 and a box cover 312, and the box cover 312 covers the box main body 311 to form a closed assembly space 313. The cylindrical battery cells 20 are installed in the assembly space 313 in an array distribution.

[0126] According to a third aspect of the present application, an electrical device 40 is provided, as ​ shown. Among them, the electrical device 40 includes the battery 30 as described above, uses the battery 30 for charging and energy storage, and uses the battery 30 for discharging to provide electrical energy for the electrical load of the electrical device 40.

[0127] The electrical device 40 includes, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, 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 vehicle toys, electric ship toys, and electric airplane toys, etc. The spacecraft may include, but is not limited to, airplanes, rockets, space shuttles, and spaceships, etc.

[0128] In the embodiment of the present application, the electrical device 40 is an electric vehicle, as ​ shown, the battery 30 is installed on the vehicle frame 42 of the electric vehicle. Applying the battery 30 provided by the embodiment design of the present application to supply power to the drive motor 41 of the electric vehicle (i.e., the electrical load of the electrical device 40), the drive motor 41 drives the wheels 43 to rotate, so that the electric vehicle can run normally.

[0129] The above are only optional embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A cylindrical battery cell, characterized in that, Comprising: A housing having an accommodation space, the housing having a first opening; An electrode assembly installed in the accommodation space, the electrode assembly having a first tab; A first end cap covering the first opening; A first adapter piece, the first adapter piece being plate-shaped, the first adapter piece including a main body portion and a protruding portion, the main body portion being connected to the first tab, the protruding portion protruding from the side of the main body portion facing the first end cap, and the protruding portion being connected to the first end cap.

2. The cylindrical battery cell according to claim 1, wherein: The first adapter piece is integrally disc-shaped.

3. The cylindrical battery cell according to claim 1, wherein: The main body portion and the protruding portion are arranged radially or circumferentially.

4. The cylindrical battery cell according to claim 3, wherein: Both the main body portion and the protruding portion are annular structures, and the main body portion and the protruding portion are arranged in an inner and outer ring nested manner.

5. The cylindrical battery cell according to claim 4, wherein: The main body portion and the protruding portion are coaxially arranged.

6. The cylindrical battery cell according to claim 4 or 5, wherein: The main body portion is arranged on the radially outer side of the protruding portion.

7. The cylindrical battery cell according to claim 6, wherein: Both the protruding portion and the main body portion are circumferentially continuous annular structures.

8. The cylindrical battery cell according to claim 6, wherein: The protruding portion is a circumferentially continuous annular structure, and the number of the main body portions is multiple and they are arranged at intervals circumferentially.

9. The cylindrical battery cell according to claim 8, wherein: The multiple main body portions are respectively connected to the first tab.

10. The cylindrical battery cell according to claim 6, wherein: The main body portion is a circumferentially continuous annular structure, and the number of the protruding portions is multiple and they are arranged at intervals circumferentially.

11. The cylindrical battery cell according to claim 10, wherein: The multiple protruding portions are respectively connected to the first end cap.

12. The cylindrical battery cell according to claim 4 or 5, wherein: The protruding portion is arranged on the radially outer side of the main body portion.

13. The cylindrical battery cell according to claim 12, wherein: Both the main body portion and the protruding portion are circumferentially continuous annular structures.

14. The cylindrical battery cell according to claim 12, wherein: The main body portion is a circumferentially continuous annular structure, and the number of the protruding portions is multiple and they are arranged at intervals circumferentially.

15. The cylindrical battery cell according to claim 12, wherein: The protruding portion is a circumferentially continuous annular structure, and the number of the main body portions is multiple and they are arranged at intervals circumferentially.

16. The cylindrical battery cell according to claim 15, wherein: The multiple main body portions are respectively connected to the first tab.

17. The cylindrical battery cell according to claim 14, wherein: The multiple protruding portions are respectively connected to the first end cap.

18. The cylindrical battery cell according to claim 3, wherein: The number of the main body parts is multiple, and the number of the protruding parts is multiple. The multiple main body parts and the multiple protruding parts are sequentially and alternately connected in the circumferential direction.

19. The cylindrical battery cell according to claim 18, wherein The multiple main body parts are respectively connected to the first pole ear, and the multiple protruding parts are respectively connected to the first end cap.

20. The cylindrical battery cell according to any one of claims 1-5, wherein The main body part includes a first non-welding area and a first welding area. The first welding area is used for welding with the first pole ear, and the first welding area protrudes towards the first pole ear with respect to the first non-welding area.

21. The cylindrical battery cell according to claim 1, wherein The protruding part includes a second non-welding area and a second welding area. The second welding area is used for welding with the first end cap, and the second welding area protrudes towards the first end cap with respect to the second non-welding area.

22. The cylindrical battery cell according to any one of claims 1-5, wherein The main body part and the protruding part are integrally formed.

23. The cylindrical battery cell according to claim 21, wherein The first adapter plate is provided with a first liquid injection hole, and the main body part and the protruding part both surround the first liquid injection hole.

24. The cylindrical battery cell according to claim 23, wherein The first end cap is provided with a second liquid injection hole, and the second liquid injection hole is axially opposite to the first liquid injection hole along the axis of the first opening.

25. The cylindrical battery cell according to claim 24, wherein The housing is a cylindrical housing. The housing is provided with a rolling groove structure that is recessed towards the accommodation space. The rolling groove structure is close to the first opening. The electrode assembly is arranged on the side of the rolling groove structure away from the first opening. The housing at the first opening is provided with a circumferential flanging; The cylindrical battery cell further includes a first insulating member and a second insulating member. The second insulating member abuts against the side of the rolling groove structure away from the electrode assembly, and the first insulating member is arranged between the circumferential flanging and the first end cap.

26. The cylindrical battery cell according to claim 24, wherein The first end cap is further provided with an explosion-proof notch. The explosion-proof notch is in an arc shape and surrounds the second liquid injection hole.

27. The cylindrical battery cell according to claim 26, wherein The first end cap has a second welding portion. The second welding portion is welded to the second welding area, and the second welding portion surrounds the explosion-proof notch.

28. The cylindrical battery cell according to any one of claims 1-5, wherein The housing further has a second opening, the second opening is arranged opposite to the first opening, and the electrode assembly further has a second pole ear; The cylindrical battery cell further includes a second end cap and a second adapter piece. The second end cap covers the second opening. Among them, the second adapter piece has the same structure as the first adapter piece. The main body part of the second adapter piece is connected to the second end cap, and the protruding part of the second adapter piece is connected to the second pole ear.

29. A battery, characterized in that, It includes the cylindrical battery cell according to any one of claims 1-28.

30. An electrical device, characterized in that, It includes the battery according to claim 29.

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