Cylindrical battery and electric equipment

Abstract

The embodiment of the utility model provides a cylindrical battery and electric equipment. The cylindrical battery comprises a shell, a battery cell, a first collector plate, a second collector plate and an adapter, the interior of the shell is hollow, and the shell is provided with a first end and a second end which are oppositely arranged; the first current collecting plate, the second current collecting plate and the battery cell are arranged in the shell; the battery cell is provided with a third end and a fourth end which are oppositely arranged; the first collector plate is arranged at the first end and connected with the third end, and the second collector plate is arranged at the second end and connected with the fourth end; the adapter comprises a first connecting part, a second connecting part and a short-circuit protection structure, the first connecting part is connected with the second end, and the second connecting part is connected with the second collector plate; the short-circuit protection structure is connected between the first connecting part and the second connecting part, and the first connecting part and the second connecting part can be disconnected when the short-circuit protection structure is fused. Short-circuit protection can be carried out on the cylindrical battery, and the use safety of the cylindrical battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery and electrical equipment. Background Art

[0002] At present, with the development of technology in electrical equipment, cylindrical batteries are being used more and more widely. Among them, the safety of cylindrical batteries is a key research topic, and the safety protection mechanism of cylindrical batteries themselves is also an important research direction. When a cylindrical battery has an abnormal short circuit, the current will suddenly increase, causing huge heat to be generated instantly in the cylindrical battery, showing violent phenomena such as explosion or flame spray, affecting the safety of electrical equipment or users.

[0003] Based on the above analysis, how to improve the safety of cylindrical battery use is an issue that the industry urgently needs to solve. Utility Model Content

[0004] In view of the above problems, embodiments of the present utility model are proposed to provide a cylindrical battery and an electrical device that overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above problems, the embodiment of the utility model discloses a cylindrical battery, including: a shell, a battery cell, a first current collecting plate, a second current collecting plate and an adapter;

[0006] The interior of the shell is hollow, and the shell has a first end and a second end that are oppositely arranged;

[0007] The first current collecting plate, the second current collecting plate and the battery cell are all arranged inside the housing; the battery cell has a third end and a fourth end arranged opposite to each other; the first current collecting plate is arranged at the first end and connected to the third end, and the second current collecting plate is arranged at the second end and connected to the fourth end;

[0008] The adapter comprises a first connecting portion, a second connecting portion and a short circuit protection structure, the first connecting portion is connected to the second end, and the second connecting portion is connected to the second current collecting plate;

[0009] The short-circuit protection structure is connected between the first connection part and the second connection part, and the first connection part and the second connection part can be disconnected when the short-circuit protection structure is blown.

[0010] Optionally, the number of the short-circuit protection structures includes at least two;

[0011] At least two of the short-circuit protection structures are arranged at intervals along the circumference of the housing;

[0012] And / or, the short circuit protection structure includes one of an aluminum alloy structure and a tin alloy structure.

[0013] Optionally, the area of the cross-section of a single short-circuit protection structure is 0.5 - 1 mm 2 , and the sum of the areas of the cross-sections of at least two short-circuit protection structures is 2 - 4 mm 2 ;

[0014] The cross-section is a section obtained by truncating along a direction perpendicular to the extension direction of the short-circuit protection structure.

[0015] Optionally, the connection between the short-circuit protection structure and the first connection portion has a rounded chamfer.

[0016] Optionally, the second current collector plate includes a third connection portion and a fourth connection portion connected to the third connection portion;

[0017] Along the axial direction of the housing, the fourth connection portion is disposed between the second connection portion and the third connection portion, the fourth connection portion is welded to the second connection portion, and the third connection portion is connected to the fourth end;

[0018] There is a first gap between the first connection portion and the fourth connection portion;

[0019] There is a second gap between the first connection portion and the third connection portion.

[0020] Optionally, the first connection portion is provided with an opening, and the opening penetrates the first connection portion along the axial direction of the housing;

[0021] The second connection portion is disposed in the opening, and at least a part of the fourth connection portion is embedded in the opening;

[0022] There is a first gap between the first connection portion and the fourth connection portion along the radial direction of the housing;

[0023] There is a second gap between the first connection portion and the third connection portion along the axial direction of the housing.

[0024] Optionally, the cylindrical battery further includes a first cover plate and a second cover plate;

[0025] The first connection portion is provided with an opening, and the opening penetrates the first connection portion along the axial direction of the housing. The opening includes a first through hole, a second through hole, and a third through hole with sequentially decreasing diameters. The first through hole, the second through hole, and the third through hole are sequentially connected, and the third through hole communicates with the inside of the housing;

[0026] The first cover plate is respectively connected to the first end and the first current collector plate;

[0027] The second cover plate is disposed within the second through hole and is fixedly welded to the first connecting portion;

[0028] The second connecting portion is disposed within the third through hole.

[0029] Optionally, the first end has a first open end, and the second end has a second open end;

[0030] The first cover plate is connected to the first open end and is used to seal the first open end;

[0031] The first connecting portion is connected to the second open end and is used to seal the second open end.

[0032] Optionally, the first connecting portion is provided with an opening, and the opening penetrates the first connecting portion along the axial direction of the housing;

[0033] Along the axial direction of the housing, the orthographic projection of the second connecting portion falls within the orthographic projection of the opening;

[0034] The second connecting portion is provided with a first liquid injection hole, the first liquid injection hole penetrates the second connecting portion along the axial direction of the housing, the second current collecting plate is provided with a second liquid injection hole, the second liquid injection hole penetrates the second current collecting plate along the axial direction of the housing, and the second liquid injection hole and the first liquid injection hole are opposite and communicated.

[0035] Optionally, the cylindrical battery further includes an insulating member, the first connecting portion is provided with an annular groove, and the notch of the annular groove is arranged facing away from the axial direction of the housing;

[0036] At least a part of the second end of the housing is embedded in the annular groove;

[0037] The insulating member is disposed between the housing and the first connecting portion and is partially embedded in the annular groove.

[0038] In a second aspect, the present invention also discloses an electrical device including the above cylindrical battery.

[0039] The embodiments of the present invention have the following advantages:

[0040] In the embodiment of the present utility model, the first current collector plate is connected to the third end of the battery cell, the second current collector plate is connected to the fourth end of the battery cell, and the second current collector plate is connected to the second connecting portion of the adapter. The second connecting portion and the first connecting portion are connected through the short-circuit protection structure, so that the cylindrical battery can form a conducting battery loop. Among them, when the short-circuit protection structure fuses, the second connecting portion and the first connecting portion can be disconnected, and thus the battery loop can be disconnected, so as to realize short-circuit protection for the cylindrical battery and improve the safety of using the cylindrical battery. Description of the Drawings

[0041] Figure 1 is an exploded view of a cylindrical battery of the present utility model;

[0042] Figure 2 is a front view of a cylindrical battery of the present utility model;

[0043] Figure 3 is the present utility model Figure 2 a cross-sectional view of the cylindrical battery in the present utility model along the directions of A1 A1 and A2 A2;

[0044] Figure 4 is the present utility model Figure 3 an enlarged view of B1 in the present utility model;

[0045] Figure 5 is the present utility model Figure 3 an enlarged view of B2 in the present utility model;

[0046] Figure 6 is a structural schematic diagram of an adapter of the present utility model;

[0047] Figure 7 is a front view of an adapter of the present utility model;

[0048] Figure 8 is the present utility model Figure 7 a cross-sectional view of the adapter in the present utility model along the CC direction;

[0049] Figure 9 is a structural schematic diagram of a second current collector plate of the present utility model;

[0050] Figure 10 is a front view of a second current collector plate of the present utility model;

[0051] Figure 11 is the present utility model Figure 10 a cross-sectional view of the second current collector plate in the present utility model along the DD direction;

[0052] Figure 12 is a cross-sectional view of a housing of the present utility model;

[0053] Figure 13 It is the statistics of the explosion or flame ejection ratio of an acupuncture experiment battery of the present utility model;

[0054] Figure 14 It is the power curve graph of a two - proportion test of the present utility model.

[0055] Explanation of reference numerals:

[0056] 1. Housing; 11. Accommodating cavity; 12. First end; 13. Second end; 14. First opening; 15. Second opening; 2. Electric core; 21. Third end; 22. Fourth end; 31. First cover plate; 32. Second cover plate; 41. First current collector plate; 42. Second current collector plate; 421. Third connecting part; 422. Fourth connecting part; 423. Second welding surface; 424. Second liquid injection hole; 5. Adapter; 51. First connecting part; 511. Opening; 5111. First through - hole; 5112. Second through - hole; 5113. Third through - hole; 514. Annular groove; 52. Second connecting part; 521. First liquid injection hole; 522. First welding surface; 523. Third welding surface; 53. Short - circuit protection structure; 531. Arc chamfer; 7. Insulating part; 71. First insulating component; 72. Second insulating component; 721. First insulating section; 722. Second insulating section; 81. First gap; 82. Second gap; 83. Third gap. Detailed implementation manners

[0057] To make the above - mentioned objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific implementation manners.

[0058] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element 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 invention.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] One of the core concepts of the embodiments of the utility model is to disclose a cylindrical battery, such as Figure 1 As shown, it includes: a shell 1, a battery cell 2, a first current collecting disc 41, a second current collecting disc 42 and an adapter 5, the interior of the shell 1 is hollow, and the shell 1 has a first end 12 and a second end 13 arranged oppositely; the first current collecting disc 41, the second current collecting disc 42 and the battery cell 2 are all arranged inside the shell 1; the battery cell 2 has a third end 21 and a fourth end 22 arranged oppositely; the first current collecting disc 41 is arranged at the first end 12 and connected to the third end 21, and the second current collecting disc 42 is arranged at the second end 13 and connected to the fourth end 22; the adapter 5 includes a first connecting portion 51, a second connecting portion 52 and a short-circuit protection structure 53, the first connecting portion 51 is connected to the second end 13, and the second connecting portion 52 is connected to the second current collecting disc 42; the short-circuit protection structure 53 is connected between the first connecting portion 51 and the second connecting portion 52, and the first connecting portion 51 and the second connecting portion 52 can be disconnected when the short-circuit protection structure 53 is blown.

[0062] In the embodiment of the present utility model, the first current collector plate 41 is connected to the third end 21 of the battery cell 2, the second current collector plate 42 is connected to the fourth end 22 of the battery cell 2, and the second current collector plate 42 is connected to the second connecting portion 52 of the adapter 5. The second connecting portion 52 and the first connecting portion 51 are connected through a short-circuit protection structure 53, so that a conductive battery circuit can be formed for the cylindrical battery. Among them, when the short-circuit protection structure 53 fuses, the second connecting portion 52 and the first connecting portion 51 can be disconnected, and further the battery circuit can be disconnected, so as to realize short-circuit protection for the cylindrical battery and improve the safety of using the cylindrical battery.

[0063] Specifically, the battery cell 2 is the wound core part of the cylindrical battery, and one of the first current collector plate 41 and the second current collector plate 42 is a positive current collector plate and the other is a negative current collector plate. In the embodiment of the present utility model, only the case where the first current collector plate 41 is the negative current collector plate and the second current collector plate 42 is the positive current collector plate is taken as an example for illustration. One end of the battery cell 2 has a negative tab, and the other end has a positive tab, that is, the first current collector plate 41 is welded to the negative tab, and the second current collector plate 42 is welded to the positive tab. Among them, at least a part of the second current collector plate 42 can extend out of the second end 13 of the housing 1, and the second current collector plate 42 can lead the electric energy of the battery cell 2 outwards to the adapter 5, so that the adapter 5 can also act as the positive terminal of the battery, and a separate positive terminal can be omitted.

[0064] Specifically, the housing 1 has a first end 12 and a second end 13, the battery cell 2 has a third end 21 and a fourth end 22 which are oppositely arranged, the first current collector plate 41 can be arranged at the first end 12 and connected to the third end 21, and the second current collector plate 42 can be arranged at the second end 13 and connected to the fourth end 22.

[0065] Specifically, the adapter 5 can include a first connecting portion 51, a second connecting portion 52 and a short-circuit protection structure 53 connected between the first connecting portion 51 and the second connecting portion 52. The first connecting portion 51 is connected to the first end 12 of the housing 1, and the second connecting portion 52 is connected to the second current collector plate 42.

[0066] Further, when the short-circuit protection structure 53 is not fused, the second connecting portion 52 and the first connecting portion 51 are conducting, and a battery circuit is formed inside the cylindrical battery. When a short-circuit phenomenon occurs in the cylindrical battery, the current at the position of the short-circuit protection structure 53 instantaneously becomes larger and the short-circuit protection structure 53 fuses in time, so that the second connecting portion 52 and the first connecting portion 51 are disconnected, and the current circuit of the battery is cut off, which can prevent violent phenomena such as explosion or flame ejection of the cylindrical battery.

[0067] Specifically, the short-circuit protection structure 53 can fuse when the current is too large to perform short-circuit protection on the cylindrical battery. The short-circuit protection structure 53 has the function of a fuse.

[0068] Specifically, the short-circuit protection structure 53 is integrated into the adapter 5, which can reduce the restrictions on the layout space of the short-circuit protection structure 53, which is conducive to increasing the size of the short-circuit protection structure 53 and ensuring the structural strength of the short-circuit protection structure 53. In this way, when the short-circuit protection structure 53 is not blown, the structural stability of the battery circuit in the cylindrical battery and the reliability of the current path can be improved.

[0069] like Figures 4 to 8 As shown, the short-circuit protection structure 53 is connected between the first connection portion 51 and the second connection portion 52 ; one end of the short-circuit protection structure 53 is connected to the first connection portion 51 , and the other end is connected to the second connection portion 52 .

[0070] Specifically, the short-circuit protection structure 53, the first connection part 51 and the second connection part 52 can be integrally formed or spliced; the short-circuit protection structure 53, the first connection part 51 and the second connection part 52 can all be metal parts to have good conductivity; the materials of the short-circuit protection structure 53, the first connection part 51 and the second connection part 52 can be the same or different.

[0071] Optionally, the connection between the short circuit protection structure 53 and the first connection part 51 may have an arc chamfer 531 to enhance the structural strength of the connection between the short circuit protection structure 53 and the first connection part 51, improve the pressure bearing capacity of the short circuit protection structure 53 and improve the overcurrent performance.

[0072] Specifically, the connection between the short-circuit protection structure 53 and the first connecting part 51 can have an arc chamfer 531. In this way, in the process of fitting the second connecting part 52 and the second current collecting plate 42 together for penetration welding to complete the connection, it can be ensured that the short-circuit protection structure 53 has a good pressure-bearing capacity, avoiding the short-circuit protection structure 53 from breaking, and improving the reliability of the connection between the second connecting part 52 and the second current collecting plate 42.

[0073] Specifically, Figure 4 As shown, along the axial direction of the shell 1, there is a third gap 83 between the second cover plate 32 and the second connecting portion 52, which can improve the convenience of penetrating welding the second connecting portion 52 and the second current collecting disc 42 from the side of the second connecting portion 52 away from the second current collecting disc 42, and can avoid affecting the size and strength of the short-circuit protection structure 53.

[0074] Specifically, the radius of the circular chamfer 531 may be greater than or equal to 0.1 mm, and may be less than or equal to the height of the third gap 83 in the axial direction of the housing 1. For example, the radius of the circular chamfer 531 may be 0.1 mm, 0.2 mm, 0.8 mm, 1 mm, 1.1 mm, etc.

[0075] Optionally, the short-circuit protection structure 53 includes one of an aluminum alloy structure and a tin alloy structure, so that the short-circuit protection structure 53 can be selected from one of an aluminum alloy structure and a tin alloy structure, which is beneficial to ensuring that the short-circuit protection structure 53 melts in time when the cylindrical battery undergoes a short circuit.

[0076] Specifically, the material of the short-circuit protection structure 53 can be a metal with a relatively low melting point such as aluminum alloy or tin alloy to ensure the fusing characteristics of the short-circuit protection structure 53.

[0077] Optionally, the number of the short-circuit protection structures 53 can be one, or at least two. When the number of the short-circuit protection structures 53 includes at least two, the at least two short-circuit protection structures 53 can be arranged at intervals along the circumferential direction of the housing 1, which can not only ensure the structural stability of the cylindrical battery, but also effectively ensure that the short-circuit protection structure 53 melts in time. And the materials of each short-circuit protection structure 53 are the same, and the sizes can be the same or approximately the same.

[0078] Specifically, the at least two short-circuit protection structures 53 can also be arranged at uniform intervals along the circumferential direction of the housing 1, which can further improve the structural stability of the cylindrical battery.

[0079] Optionally, the area of the cross-section of a single short-circuit protection structure 53 can be 0.5-1 mm 2 , and the sum of the cross-sectional areas of the at least two short-circuit protection structures 53 is 2-4 mm 2 , and the cross-section is a section obtained by truncating along a direction perpendicular to the extending direction of the short-circuit protection structure 53, which is beneficial to ensuring that the short-circuit protection structure 53 melts in time and realizing short-circuit protection. Since the short-circuit protection structure 53 is a three-dimensional structure with a three-dimensional space, the short-circuit protection structure 53 extends in three directions of the three-dimensional space, that is, the short-circuit protection structure 53 has a length, width and height. In this embodiment, the extending direction of the short-circuit protection structure 53 refers to the length direction of the short-circuit protection structure 424. For example, Figure 6 as shown, the extending direction of the short-circuit protection structure 53 refers to the direction from the central axis of the housing 1 to the wall of the housing 1, that is, the radial direction of the housing 1.

[0080] Specifically, as Figure 6 shown, in the embodiment of the present invention, only the number of the short-circuit protection structures 53 is taken as 4, the short-circuit protection structures 53 extend along the radial direction of the housing 1, and the cross-sectional shape of the cross-section of a single short-circuit protection structure 53 is a square of 1 mm * 1 mm as an example, and other situations can be set with reference, and the embodiment of the present invention does not make specific limitations thereto.

[0081] Specifically, according to Q = I 2 RT, when the resistance is large, the instantaneous temperature rise during a short circuit is sufficient to melt the short-circuit protection structure 53 in time when the temperature rise is sufficient.

[0082] Specifically, in the embodiment of the present utility model, the number and cross-sectional area of the short-circuit protection structure 53 can be reasonably designed to ensure that when an abnormal short circuit occurs inside the cylindrical battery, the current instantaneously increases. According to Q = I 2 RT, within a short period of time, a great deal of heat is generated at the position of the short-circuit protection structure 53, the temperature rises, and the short-circuit protection structure 53 can instantaneously self-fuse, thereby cutting off the entire battery circuit and preventing violent phenomena such as explosion or flame ejection of the cylindrical battery.

[0083] Optionally, the shape of the short-circuit protection structure 53 includes at least one of a straight line shape, an arc shape, a broken line shape, and a wavy shape. In some embodiments, the cross-sectional shape of the short-circuit protection structure 53 includes at least one of a circular shape and a polygonal shape, so that the structure of the short-circuit protection structure 53 is applicable and matched to different spaces.

[0084] Optionally, the second current collector plate 42 includes a third connecting portion 421 and a fourth connecting portion 422 connected to the third connecting portion 421; along the axial direction of the housing 1, the fourth connecting portion 422 is disposed between the second connecting portion 52 and the third connecting portion 421, the fourth connecting portion 422 and the second connecting portion 52 are welded, and the third connecting portion 421 is connected to the fourth end 22.

[0085] In the embodiment of the present utility model, the fourth connecting portion 422 and the second connecting portion 52 are welded, which facilitates the realization of the firmness and conductivity of the connection between the second connecting portion 52 and the second current collector plate 42.

[0086] Specifically, along the axial direction of the housing 1, the second connecting portion 52 and the fourth connecting portion 422 can be oppositely arranged, the surface of the second connecting portion 52 opposite to the fourth connecting portion 422 can be a first welding surface 522, and the surface of the fourth connecting portion 422 opposite to the second connecting portion 52 is a second welding surface 423. Further, the surface of the second connecting portion 52 facing away from the fourth connecting portion 422 can be a third welding surface 523, and penetration welding can be performed through the third welding surface 523, so that the first welding surface 522 and the second welding surface 423 are welded into one body to improve the convenience of connecting the second connecting portion 52 and the fourth connecting portion 422.

[0087] Specifically, the third connecting portion 421 and the fourth connecting portion 422 can be directly connected or indirectly connected.

[0088] Exemplarily, the first connecting portion 51, the second connecting portion 52, the third connecting portion 421, and the fourth connecting portion 422 can all be annular structures. The first connecting portion 51 can be sleeved outside the second connecting portion 52 and at least partially sleeved outside the fourth connecting portion 422; alternatively, the second connecting portion 52 is disposed above the first connecting portion 51, and the fourth connecting portion 422 can pass through the first connecting portion 51 to be connected to the second connecting portion 52.

[0089] Specifically, when the short-circuit protection structure 53 is not fused, the first connecting portion 51 and the second connecting portion 52 can be connected through the short-circuit protection structure 53, the second connecting portion 52 is connected to the fourth connecting portion 422, and the fourth connecting portion 422 is connected to the third connecting portion 421, so as to realize the conduction of the battery circuit. When the short-circuit protection structure 53 is fused, the connection between the first connecting portion 51 and the second connecting portion 52 is disconnected, and thus the battery circuit can be cut off to protect the cylindrical battery.

[0090] Optionally, there is a first gap 81 between the first connecting portion 51 and the fourth connecting portion 422 to prevent them from being directly conducted without passing through the short-circuit protection structure 53; there is a second gap 82 between the first connecting portion 51 and the third connecting portion 421 to prevent them from being directly conducted without passing through the short-circuit protection structure 53. In this way, when the connection between the first connecting portion 51 and the second connecting portion 52 is disconnected due to the fusion of the short-circuit protection structure 53, since the first connecting portion 51 is only connected to the second end 13, and the second connecting portion 52 is only connected to the second current collector plate 42, the reliability of cutting off the battery circuit is ensured.

[0091] Optionally, the first connecting portion 51 is provided with an opening 511, and the opening 511 penetrates the first connecting portion 51 along the axial direction of the housing 1; the second connecting portion 52 is disposed in the opening 511, and at least part of the fourth connecting portion 422 is embedded in the opening 511; along the radial direction of the housing 1, there is a first gap 81 between the first connecting portion 51 and the fourth connecting portion 422; along the axial direction of the housing 1, there is a second gap 82 between the first connecting portion 51 and the third connecting portion 421.

[0092] In the embodiment of the present invention, along the radial direction of the housing 1, there is a first gap 81 between the first connecting portion 51 and the fourth connecting portion 422; along the axial direction of the housing 1, there is a second gap 82 between the first connecting portion 51 and the third connecting portion 421. In this way, after the short-circuit protection structure 53 is fused, the connection between the first connecting portion 51 and the second current collector plate 42 can be effectively ensured to be disconnected. Moreover, along the axial direction of the housing 1, there is a second gap 82 between the first connecting portion 51 and the third connecting portion 421, which can also improve the installation convenience between the second connecting portion 52 and the fourth connecting portion 422. Exemplarily, the second gap 82 can be 0.1 mm, 0.2 mm, 0.3 mm, etc.

[0093] Optionally, as Figures 1 to 12 shown, the first connecting portion 51, the second connecting portion 52, the third connecting portion 421, and the fourth connecting portion 422 can all be rotary body structures; the first connecting portion 51 is sleeved outside the second connecting portion 52, and the fourth connecting portion 422 protrudes from the third connecting portion 421.

[0094] Furthermore, the axes of the first connecting portion 51, the second connecting portion 52, the third connecting portion 421, and the fourth connecting portion 422 can coincide to effectively improve the structural stability of the cylindrical battery.

[0095] Optionally, the cylindrical battery further includes a first cover plate 31 and a second cover plate 32. As Figure 8 shown, an opening 511 is provided on the first connecting portion 51. The opening 511 can penetrate the first connecting portion 51 along the axial direction of the housing 1. The opening 511 can include a first through hole 5111, a second through hole 5112, and a third through hole 5113 with gradually decreasing diameters. The first through hole 5111, the second through hole 5112, and the third through hole 5113 are sequentially communicated, and the third through hole 5113 is communicated with the inside of the housing 1; the first cover plate 31 is respectively connected to the first end 12 and the first current collector plate 41; the second cover plate 32 is disposed in the second through hole 5112 and is fixedly welded to the first connecting portion 51; the second connecting portion 52 is disposed in the third through hole 5113.

[0096] In the embodiment of the present utility model, the first through hole 5111 and the second through hole 5112 can be combined to form a stepped hole. Fixing the second cover plate 32 in the second through hole 5112 can prevent the second cover plate 32 from protruding from the outer surface of the adapter 5, thereby improving the reliability of the adapter 5 when accessing the circuit.

[0097] Specifically, in the housing 1, the first end 12 can be directly connected to the first cover plate 31, the first cover plate 31 is connected to the first current collector plate 41, and the second end 13 can be indirectly connected to the second cover plate 32 through the first connecting portion 51.

[0098] Specifically, the first cover plate 31, the second cover plate 32, and the housing 1 can all be rigid structures made of metal materials to ensure the structural strength of the cylindrical battery and protect the internal devices of the cylindrical battery.

[0099] Optionally, as Figure 12 shown, the housing 1 can be a hollow cylinder with openings at both ends. The first end 12 can have a first opening 14, and the second end 13 can have a second opening 15; the first cover plate 31 can be connected to the first opening 14 and is used to block the first opening 14, and the first connecting portion 51 can be connected to the second opening 15 and is used to block the second opening 15.

[0100] In an embodiment of the present utility model, the first cover plate 31, the second cover plate 32 and the housing 1 can be spliced together, making the assembly process of the battery relatively simple and convenient.

[0101] Specifically, connect the first cover plate 31 to the first open end 14, connect the first connecting portion 51 to the second open end 15, and connect the second cover plate 32 to the second through hole 5112 on the first connecting portion 51, and an accommodating cavity 11 can be formed by enclosing.

[0102] In other cases, the housing 1 can also be a hollow cylinder with an open end at the second end 13.

[0103] Specifically, the first cover plate 31 and the housing 1 can be sealed and fixedly connected, the first connecting portion 51 and the housing 1 can be sealed and fixedly connected, and the first connecting portion 51 and the second cover plate 32 can be sealed and fixedly connected to improve the sealing and waterproof performance of the accommodating cavity 11.

[0104] Specifically, along the axial direction of the housing 1, the first through hole 5111, the second through hole 5112 and the third through hole 5113 are sequentially communicated and the diameters are sequentially reduced, and the first through hole 5111, the second through hole 5112 and the third through hole 5113 can be combined to form a stepped hole.

[0105] Specifically, along the axial direction of the housing 1, the depth of the second through hole 5112 is greater than or equal to 0.1 mm to further effectively prevent the second cover plate 32 from protruding out of the outer surface of the adapter 5.

[0106] Specifically, the second cover plate 32 is fixed in the second through hole 5112 and connected to the first connecting portion 51. The second connecting portion 52 and the short-circuit protection structure 53 are both arranged in the third through hole 5113, and the second connecting portion 52 is connected to the first connecting portion 51 through the short-circuit protection structure 53. The second cover plate 32 and the second connecting portion 52 are spaced apart to improve the reliability of disconnecting the first connecting portion 51 and the second connecting portion 52.

[0107] Optionally, the first connecting portion 51 is provided with an opening 511, and the opening 511 penetrates the first connecting portion 51 along the axial direction of the housing 1; along the axial direction of the housing 1, the orthographic projection of the second connecting portion 52 falls within the orthographic projection of the opening 511, so as to facilitate the connection and fixation between the second connecting portion 52 and the second current collector plate 42.

[0108] Specifically, the orthographic projection of the fourth connecting portion 422 can fall within the orthographic projection of the opening 511, so as to facilitate the connection and fixation between the second connecting portion 52 and the fourth connecting portion 422.

[0109] Optionally, the second connection part 52 is provided with a first liquid injection hole 521 which penetrates the second connection part 52 along the axial direction of the housing 1. The second current collecting plate 42 is provided with a second liquid injection hole 424 which penetrates the second current collecting plate 42 along the axial direction of the housing 1. The second liquid injection hole 424 and the first liquid injection hole 521 are opposite and communicated with each other to improve the convenience and reliability of injecting electrolyte into the battery cell 2.

[0110] Optionally, as Figure 4 shown, the cylindrical battery further includes an insulating member 7. As Figure 6 shown, the first connection part 51 is provided with an annular groove 514, and the notch of the annular groove 514 is arranged facing away from the axial direction of the housing 1; at least a part of the second end 13 of the housing 1 is embedded in the annular groove 514; the insulating member 7 is arranged between the housing 1 and the first connection part 51, and a part of the insulating member 7 is embedded in the annular groove 514 to insulate the housing 1 from the adapter 5.

[0111] In the embodiment of the present invention, the second end 13 of the housing 1 is embedded in the annular groove 514 of the first connection part 51, so that riveting can be achieved between the housing 1 and the adapter 5. Moreover, an insulating member 7 is arranged between the housing 1 and the first connection part 51, which can prevent conduction between the housing 1 and the adapter 5, thereby avoiding short circuit of the cylindrical battery and improving the use safety of the cylindrical battery.

[0112] Specifically, as Figure 6 shown, the annular groove 514 is arranged on the outer periphery of the first connection part 51, and the notch faces outward.

[0113] Optionally, the insulating member 7 may include a first insulating part 71 and a second insulating part 72. The first insulating part 71 and the second insulating part 72 may be embedded in the annular groove 514 and combined to form an annular space, and at least a part of the housing 1 may be accommodated in the annular space.

[0114] Optionally, the second insulating part 72 may include a first insulating section 721 and a second insulating section 722. Both the first insulating section 721 and the second insulating section 722 are annular structures, and the outer diameter of the first insulating section 721 may be smaller than the inner diameter of the second insulating section 722. In this way, the second insulating part 72 can be spliced, which can improve the convenience of riveting the housing 1 and the adapter 5.

[0115] Exemplarily, the assembly steps of the cylindrical battery described in the embodiment of the present invention may include:

[0116] S1: Rivet the insulating member 7, the housing 1 and the adapter 5 together and fasten them into one body;

[0117] S2: Weld the negative electrode tab of the battery cell 2 to the first current collecting plate 41, and weld the positive electrode tab to the second current collecting plate 42;

[0118] S3: Wrap the battery cell 2 with glue and insert it into the housing 1 from the first end 12 of the housing 1;

[0119] S4: Apply appropriate pressure to the battery cell 2 so that the first welding surface 522 of the second connection part 52 fits against the second welding surface 423 of the fourth connection part 422, and then perform penetration welding through the third welding surface 523 of the second connection part 52 to complete the positive electrical connection of the cylindrical battery;

[0120] S5: Close the first cover plate 31 with the first end 12 of the housing 1 and perform penetration welding between the first cover plate 31 and the first current collector plate 41;

[0121] S6: Perform sealing welding between the first cover plate 31 and the housing 1;

[0122] S7: Place the battery cell 2 upright and inject electrolyte through the first liquid injection hole 521 and the second liquid injection hole 424;

[0123] S8: Assemble the second cover plate 32 with the first connection part 51, insert the second cover plate 32 into the second through hole 5112 on the first connection part 51, and perform sealing welding to complete the sealing of the cylindrical battery.

[0124] Specifically, the test items are the cylindrical battery in the present utility model and the traditional cylindrical battery. The two are used as comparison items to compare the battery safety performance of the two under the same condition of needle puncture experiment. The number of samples can be 100 groups. The factor X1 is whether there is a short - circuit protection structure 53, and the corresponding result Y1 is the proportion of battery explosion or flame ejection. Among them, the difference between the two cylindrical batteries is only that: the cylindrical battery in the present utility model has a short - circuit protection structure 53 (four short - circuit protection structures are evenly distributed), and the traditional cylindrical battery has no short - circuit protection structure 53.

[0125] Furthermore, the test conditions include: 1. Design of the incoming battery cells 2. The tab forming method of the incoming battery cells 2 is cut and stacked. The tabs are led out from both ends of the battery cell 2. The total height tolerance of the battery cell 2 is designed to be ±0.2 mm. The separator is a 12-μm PP-based film. 2. Usage of the lasers. The laser for welding the battery cell 2 and the first current collector 41 is IPG YLS-1000 / 1000-SM-AMB. The laser for welding the battery cell 2 and the second current collector 42 is IPG YLR-2000-SM. The laser for welding the second connecting part 52 and the second current collector 42 is IPG YLR-2000-SM. The laser for welding the first cover plate 31 and the first current collector 41 is IPG YLR-2000-SM. The laser for welding the first cover plate 31 and the housing 1 is IPG YLS-2000 / 2000-AMB. The laser for welding the second cover plate 32 and the first connecting part 51 is IPG YLS-2000 / 2000-SM-AMB. The proportion of the list item for battery explosion or flame ejection is required to be less than 0%, and the detection method is by observation and statistics.

[0126] The experimental results are as Figure 13 shown. In the pinprick test of the cylindrical battery of the present utility model, the proportion of battery explosion or flame ejection is 0%, which can effectively improve the safety of the cylindrical battery. Among them, from the disassembly effect, after pinpricking, the short-circuit protection structures are all melted, and the protection effect is remarkable.

[0127] Specifically, a two-proportion hypothesis test is conducted on the proportion of battery explosion or flame ejection in the pinprick test of different cylindrical battery structures. Null hypothesis: There is no significant difference in the proportion of battery explosion or flame ejection between the cylindrical battery of the present utility model and the traditional cylindrical battery; Alternative hypothesis: The proportion of battery explosion or flame ejection of the cylindrical battery of the present utility model < the proportion of battery explosion or flame ejection of the traditional cylindrical battery.

[0128] Hypothesis test results:

[0129] Two-proportion test and confidence interval

[0130]

[0131] Among them, the difference = p(1) - p(2), difference estimate: -0.89, 95% upper confidence limit of the difference: -0.838534. Test of the difference = 0 (versus <0): Z = -28.44, P-value = 0.000. Fisher's exact test: P-value = 0.000. P-value < 0.05, accept the alternative hypothesis.

[0132] Sample calculation is as Figure 14 shown. At the statistical defective rate, the power value of the sample size of 100 reaches 100%, and the sample size meets the judgment.

[0133] In the embodiment of the present utility model, the first current collector plate 41 is connected to the third end 21 of the battery cell 2, the second current collector plate 42 is connected to the fourth end 22 of the battery cell 2, and the second current collector plate 42 is connected to the second connection portion 52 of the adapter 5. The second connection portion 52 and the first connection portion 51 are connected through a short-circuit protection structure 53, so that the cylindrical battery can form a conductive battery circuit. Wherein, when the short-circuit protection structure 53 fuses, the second connection portion 52 and the first connection portion 51 can be disconnected, and further the battery circuit can be disconnected, so as to realize short-circuit protection for the cylindrical battery and improve the safety of using the cylindrical battery.

[0134] In a second aspect, the embodiment of the present utility model also discloses an electrical device, which may specifically include the above-mentioned cylindrical battery.

[0135] In the embodiment of the present utility model, the electrical device includes the cylindrical battery, and the cylindrical battery can supply power to the electrical device.

[0136] The electrical device described in the embodiment of the present utility model has at least the following advantages:

[0137] In the embodiment of the present utility model, the first current collector plate 41 is connected to the third end 21 of the battery cell 2, the second current collector plate 42 is connected to the fourth end 22 of the battery cell 2, and the second current collector plate 42 is connected to the second connection portion 52 of the adapter 5. The second connection portion 52 and the first connection portion 51 are connected through a short-circuit protection structure 53, so that the cylindrical battery can form a conductive battery circuit. Wherein, when the short-circuit protection structure 53 fuses, the second connection portion 52 and the first connection portion 51 can be disconnected, and further the battery circuit can be disconnected, so as to realize short-circuit protection for the cylindrical battery and improve the safety of using the cylindrical battery.

[0138] The above provides a detailed introduction to a cylindrical battery and an electrical device provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A cylindrical battery, characterized in that: It comprises a housing (1), a battery cell (2), a first current collecting disc (41), a second current collecting disc (42), and an adapter (5); The interior of the shell (1) is hollow, and the shell (1) has a first end (12) and a second end (13) arranged opposite to each other; The first current collecting disc (41), the second current collecting disc (42) and the battery cell (2) are all arranged inside the housing (1); the battery cell (2) has a third end (21) and a fourth end (22) arranged opposite to each other; the first current collecting disc (41) is arranged at the first end (12) and connected to the third end (21), and the second current collecting disc (42) is arranged at the second end (13) and connected to the fourth end (22); The adapter (5) comprises a first connecting portion (51), a second connecting portion (52) and a short-circuit protection structure (53), wherein the first connecting portion (51) is connected to the second end (13), and the second connecting portion (52) is connected to the second current collecting plate (42); The short-circuit protection structure (53) is connected between the first connection part (51) and the second connection part (52), and when the short-circuit protection structure (53) is fused, the first connection part (51) and the second connection part (52) can be disconnected.

2. The cylindrical battery according to claim 1, characterized in that: The number of the short-circuit protection structures (53) includes at least two; At least two of the short-circuit protection structures (53) are arranged at intervals along the circumference of the housing (1); And / or, the short circuit protection structure (53) comprises one of an aluminum alloy structure and a tin alloy structure.

3. The cylindrical battery according to claim 1, characterized in that: The cross-sectional area of ​​a single short-circuit protection structure (53) is 0.5-1 mm 2 The sum of the cross-sectional areas of at least two of the short-circuit protection structures (53) is 2-4 mm 2 ; The cross section is a cross section obtained by cutting along a direction perpendicular to the extension direction of the short-circuit protection structure (53).

4. The cylindrical battery according to claim 1, characterized in that: A connection point between the short-circuit protection structure (53) and the first connection portion (51) has an arc chamfer (531).

5. The cylindrical battery according to claim 1, characterized in that: The second current collecting plate (42) comprises a third connecting portion (421) and a fourth connecting portion (422) connected to the third connecting portion (421); Along the axial direction of the housing (1), the fourth connection portion (422) is arranged between the second connection portion (52) and the third connection portion (421), the fourth connection portion (422) and the second connection portion (52) are welded together, and the third connection portion (421) is connected to the fourth end (22); A first gap (81) is provided between the first connecting portion (51) and the fourth connecting portion (422); A second gap (82) is provided between the first connection portion (51) and the third connection portion (421).

6. The cylindrical battery according to claim 5, characterized in that: The first connecting portion (51) is provided with an opening (511), and the opening (511) penetrates the first connecting portion (51) along the axial direction of the housing (1); The second connection portion (52) is disposed in the opening (511), and at least a portion of the fourth connection portion (422) is embedded in the opening (511); Along the radial direction of the housing (1), there is the first gap (81) between the first connecting portion (51) and the fourth connecting portion (422); Along the axial direction of the housing (1), the second gap (82) is provided between the first connecting portion (51) and the third connecting portion (421).

7. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further comprises a first cover plate (31) and a second cover plate (32); The first connecting portion (51) is provided with an opening (511), the opening (511) penetrates the first connecting portion (51) along the axial direction of the housing (1), the opening (511) comprises a first through hole (5111), a second through hole (5112) and a third through hole (5113) with diameters decreasing in sequence, the first through hole (5111), the second through hole (5112) and the third through hole (5113) are connected in sequence, and the third through hole (5113) is connected to the interior of the housing (1); The first cover plate (31) is connected to the first end (12) and the first current collecting plate (41) respectively; The second cover plate (32) is disposed in the second through hole (5112) and is fixed to the first connecting portion (51) by welding; The second connecting portion (52) is disposed in the third through hole (5113).

8. The cylindrical battery according to claim 7, characterized in that: The first end (12) has a first opening (14), and the second end (13) has a second opening (15); The first cover plate (31) is connected to the first opening (14) and is used to seal the first opening (14); The first connecting portion (51) is connected to the second opening (15) and is used to seal the second opening (15).

9. The cylindrical battery according to claim 1, characterized in that: The first connecting portion (51) is provided with an opening (511), and the opening (511) penetrates the first connecting portion (51) along the axial direction of the housing (1); Along the axial direction of the housing (1), the orthographic projection of the second connecting portion (52) falls within the orthographic projection of the opening (511); The second connecting portion (52) is provided with a first liquid injection hole (521), and the first liquid injection hole (521) penetrates the second connecting portion (52) along the axial direction of the shell (1); the second collecting plate (42) is provided with a second liquid injection hole (424), and the second liquid injection hole (424) penetrates the second collecting plate (42) along the axial direction of the shell (1); the second liquid injection hole (424) and the first liquid injection hole (521) are opposite to each other and are connected.

10. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further comprises an insulating member (7), the first connecting portion (51) is provided with an annular groove (514), and the notch of the annular groove (514) is arranged away from the axial direction of the housing (1); The second end (13) of the housing (1) is at least partially embedded in the annular groove (514); The insulating member (7) is arranged between the housing (1) and the first connecting portion (51), and is partially embedded in the annular groove (514).

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

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