Cylindrical battery and electric equipment

Abstract

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 a pole, 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; the second collector plate comprises a first connecting part, a second connecting part and a short-circuit protection structure, the first connecting part is connected with the fourth end, the second connecting part is connected with the pole, and the pole penetrates through the second end and is in insulated connection with the second end; 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] Currently, with the technological advancement of electrical devices, cylindrical batteries are increasingly being used. The safety of cylindrical batteries is a key research topic, and the safety protection mechanisms of cylindrical batteries themselves are also an important research direction. When a cylindrical battery experiences an abnormal short circuit, the current suddenly increases, causing a huge amount of heat to be generated within the cylindrical battery, resulting in violent phenomena such as explosions or flames, which can affect the safety of electrical devices and users.

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

[0004] In view of the above problems, embodiments of the present invention 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 present utility model discloses a cylindrical battery, comprising: a housing, a battery cell, a first current collecting plate, a second current collecting plate and a pole;

[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 disc, the second current collecting disc 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 disc is arranged at the first end and connected to the third end, and the second current collecting disc is arranged at the second end;

[0008] The second current collecting disk includes a first connecting portion, a second connecting portion, and a short-circuit protection structure, wherein the first connecting portion is connected to the fourth end, the second connecting portion is connected to the pole, and the pole is provided through the second end and is insulated from the second end;

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

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

[0011] At least two short-circuit protection structures are arranged at intervals along the circumference of the housing, and each short-circuit protection structure is connected between the first connecting portion and the second connecting portion;

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

[0013] Optionally, the cross-sectional area of a single short-circuit protection structure is 0.5-1 mm 2 The sum of the cross-sectional areas of all the short-circuit protection structures is 2-4 mm 2 ;

[0014] The cross section is a cross section obtained by cutting along a direction perpendicular to an extension direction of the short-circuit protection structure, and the extension direction is a direction from the first connecting portion to the second connecting portion.

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

[0016] Optionally, there is a gap between the pole and the first connecting portion.

[0017] Optionally, a receiving groove is provided at one end of the pole facing the battery cell, and a notch of the receiving groove is provided facing the battery cell;

[0018] At least a portion of the second connecting portion is embedded in the accommodating groove and connected to the pole.

[0019] Optionally, the pole is provided with a first liquid injection hole, and the second connecting portion is provided with a second liquid injection hole;

[0020] The first liquid injection hole penetrates the pole along the axial direction of the shell, and the first liquid injection hole penetrates the bottom wall of the accommodating groove;

[0021] The second liquid injection hole passes through the second connecting portion along the axial direction of the housing, and the second liquid injection hole is opposite to and communicates with the first liquid injection hole.

[0022] Optionally, the cylindrical battery further includes a first cover plate and a second cover plate, and a stepped groove is provided at one end of the electrode away from the battery cell, with the notch of the stepped groove facing the outside of the shell; the first liquid injection hole passes through the bottom wall of the stepped groove;

[0023] The first cover plate is connected to the first current collecting plate and is sealed to the first end;

[0024] The second cover plate is sealed and connected in the stepped groove.

[0025] The stepped groove includes a first groove, a second groove and a third groove; along the direction from the second current collecting plate to the first current collecting plate, the first groove, the second groove and the third groove are sequentially connected, and the slot sizes of the first groove, the second groove and the third groove are sequentially reduced;

[0026] The second cover plate is disposed in the second groove and is welded and fixed to the groove side wall of the second groove to seal the groove opening of the third groove.

[0027] Optionally, the first connecting portion and the second connecting portion are spaced apart along the axial direction of the housing, and at least two short-circuit protection structures are spaced apart along the circumferential direction of the housing, and each short-circuit protection structure is connected between the first connecting portion and the second connecting portion;

[0028] A first avoidance hole is formed between the first connecting portion, the second connecting portion, and two adjacent short-circuit protection structures, and the first liquid injection hole, the second liquid injection hole, and the first avoidance hole constitute a channel for electrolyte to flow;

[0029] And / or, the first connection part is provided with a second avoidance hole, the second avoidance hole passes through the first connection part along the axial direction of the shell and is connected with the second injection hole, and the first injection hole, the second injection hole and the second avoidance hole constitute a channel for electrolyte circulation.

[0030] Optionally, the cylindrical battery further includes an insulating member, the pole is provided with an annular groove, and the notch of the annular groove is arranged away from the axial direction of the shell;

[0031] The second end of the housing is at least partially embedded in the annular groove;

[0032] The insulating member is arranged between the second end of the shell and the pole, and is partially embedded in the annular groove.

[0033] In a second aspect, the utility model further discloses an electrical device comprising the above cylindrical battery.

[0034] The present invention has the following advantages:

[0035] In an embodiment of the present invention, the first current collecting disc is connected to the third end of the battery cell, the first connecting portion of the second current collecting disc is connected to the fourth end of the battery cell, and the second connecting portion of the second current collecting disc is connected to the terminal post. The second connecting portion and the first connecting portion are connected via a short-circuit protection structure, so that in the cylindrical battery, the battery cell is connected to the external circuit via the first connecting portion, the short-circuit protection structure, the second connecting portion, and the terminal post in sequence, forming a pathway. When the short-circuit protection structure blows, the second connecting portion and the first connecting portion can be disconnected, thereby disconnecting the pathway. This can provide short-circuit protection for the cylindrical battery and improve the safety of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1This is an exploded view of a cylindrical battery of the present invention;

[0037] Figure 2 This is a front view of a cylindrical battery of the present invention;

[0038] Figure 3 This utility model Figure 2 Cross-sectional view of the cylindrical battery along the A1 A1 and A2 A2 directions;

[0039] Figure 4 This utility model Figure 3 The enlarged view of point B1 in the middle;

[0040] Figure 5 This utility model Figure 3 The enlarged view of B2 in the middle;

[0041] Figure 6 This is a schematic structural diagram of a pole of the utility model;

[0042] Figure 7 This is a front view of a pole of the utility model;

[0043] Figure 8 This utility model Figure 7 Cross-sectional view of the pole along CC direction;

[0044] Figure 9 This is a structural diagram of a second current collecting plate of the utility model;

[0045] Figure 10 This is a front view of a second current collecting plate of the present utility model;

[0046] Figure 11 This utility model Figure 10 A cross-sectional view of the second collecting plate along the DD direction;

[0047] Figure 12 This is a cross-sectional view of a housing of the present utility model;

[0048] Figure 13 This utility model is a needle puncture test battery explosion or flame jet ratio statistics;

[0049] Figure 14 It is an efficacy curve diagram of a double ratio test of the present invention.

[0050] Description of reference numerals:

[0051] 1. Housing; 11. Accommodation cavity; 12. First end; 13. Second end; 14. First opening; 15. Second opening; 2. Cell; 21. Third end; 22. Fourth end; 31. First cover; 32. Second cover; 41. First collector plate; 42. Second collector plate; 42. First connecting portion; 4211. Second avoidance hole; 422. Second connecting portion; 4221. Second injection hole; 423. Second welding surface; 424. Short-circuit protection Protective structure; 4241, arc chamfer; 425, first avoidance hole; 5, pole; 51, accommodating groove; 511, first welding surface; 52, stepped groove; 521, first groove; 522, second groove; 523, third groove; 524, third welding surface; 53, annular groove; 54, first liquid injection hole; 6, gap; 7, insulating part; 71, first insulating component; 72, second insulating component; 721, first insulating section; 722, second insulating section. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0053] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of these features. In the description of this utility model, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected items, and the character " / " generally indicates an "or" relationship between the connected items.

[0054] 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 to 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0055] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0056] like Figures 1 to 12 As shown, one of the core concepts of the embodiment of the present invention is to disclose a cylindrical battery, comprising: a shell 1, a battery cell 2, a first current collecting disc 41, a second current collecting disc 42 and a pole 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 first end 12 and connected to the third end 21, and the second current collecting disc 42 is arranged at the fourth end 22. The current collecting disc 42 is arranged at the second end 13; the second current collecting disc 42 includes a first connecting portion 421, a second connecting portion 422 and a short-circuit protection structure 424, the first connecting portion 421 is connected to the fourth end 22, the second connecting portion 422 is connected to the pole 5, the pole 5 is passed through the second end 13 and is insulated from the second end 13; the short-circuit protection structure 424 is connected between the first connecting portion 421 and the second connecting portion 422, and the first connecting portion 421 and the second connecting portion 422 can be disconnected when the short-circuit protection structure 424 is blown.

[0057] In an embodiment of the present invention, the first current collecting disc 41 is connected to the third end 21 of the battery cell 2, the first connection portion 421 of the second current collecting disc 42 is connected to the fourth end 22 of the battery cell 2, and the second connection portion 422 of the second current collecting disc 42 is connected to the terminal 5. The second connection portion 422 and the first connection portion 421 are connected via a short-circuit protection structure 424. Thus, in the cylindrical battery, the battery cell 2 is connected to the external circuit via the first connection portion 421, the short-circuit protection structure 424, the second connection portion 422, and the terminal 5 in sequence, forming a pathway. When the short-circuit protection structure 424 blows, the second connection portion 422 and the first connection portion 421 are disconnected, thereby disconnecting the pathway. This can provide short-circuit protection for the cylindrical battery and improve the safety of the cylindrical battery.

[0058] Specifically, the battery cell 2 forms the core of the cylindrical battery. One of the first and second current collecting discs 41, 42 is a positive current collecting disc, and the other is a negative current collecting disc. This embodiment of the utility model illustrates the case where the first current collecting disc 41 is a negative current collecting disc and the second current collecting disc 42 is a positive current collecting disc. The battery cell 2 has a negative tab at one end and a positive tab at the other. Specifically, the first current collecting disc 41 is welded to the negative tab, and the second current collecting disc 42 is welded to the positive tab. The second current collecting disc 42 can conduct the electrical energy of the battery cell 2 to the electrode 5, which can serve as the positive terminal of the cylindrical battery.

[0059] Specifically, the shell 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 arranged opposite to each other, the first collecting plate 41 is arranged at the first end 12 and connected to the third end 21, and the second collecting plate 42 is arranged at the second end 13.

[0060] Specifically, the second current collecting plate 42 includes a first connecting portion 421, a second connecting portion 422, and a short-circuit protection structure 424 connected between the first connecting portion 421 and the second connecting portion 422. The first connecting portion 421 is connected to the fourth end 22, and the second connecting portion 422 is connected to the pole 5. The pole 5 is provided through the second end 13 and is insulated from the second end 13. This allows the battery cell 2 to communicate with the external circuit while effectively preventing the pole 5 from being electrically connected to the housing 1 and causing a short circuit.

[0061] Furthermore, when the short-circuit protection structure 424 is intact, the first connection portion 421 and the second connection portion 422 are electrically connected, forming a pathway between the cylindrical battery and the external circuit. When a short circuit occurs in the cylindrical battery, the current at the location of the short-circuit protection structure 424 increases instantaneously, causing it to fuse immediately. The first connection portion 421 and the second connection portion 422 are disconnected, and the pathway is severed, preventing the cylindrical battery from exploding or emitting flames.

[0062] Specifically, the short-circuit protection structure 424 can be fused when the current is too large to protect the cylindrical battery from short circuits. The short-circuit protection structure 424 acts as a fuse.

[0063] Specifically, integrating the short-circuit protection structure 424 in the second current collecting disk 42 can improve the convenience of preparing the short-circuit protection structure 424, and can reduce the stress on the short-circuit protection structure 424, so as to ensure the structural strength of the short-circuit protection structure 424. In this way, when the short-circuit protection structure 424 is not blown, the connection stability of the path and the reliability of current passage can be improved.

[0064] like Figures 1 to 11As shown, the short-circuit protection structure 424 is connected between the first connection portion 421 and the second connection portion 422 ; one end of the short-circuit protection structure 424 is connected to the first connection portion 421 , and the other end is connected to the second connection portion 422 .

[0065] Specifically, when the short-circuit protection structure 424 is not blown, the first connection portion 421 and the second connection portion 422 can be indirectly connected through the short-circuit protection structure 424, thereby achieving a conductive path. When the short-circuit protection structure 424 is blown, the first connection portion 421 remains connected to the battery cell 2, the second connection portion 422 remains connected to the terminal 5, and the first connection portion 421 and the second connection portion 422 are disconnected, thereby cutting off the path and protecting the cylindrical battery.

[0066] Specifically, the short-circuit protection structure 424, the first connection part 421 and the second connection part 422 can be integrally formed or spliced; the short-circuit protection structure 424, the first connection part 421 and the second connection part 422 can all be metal parts to have good conductivity; the materials of the short-circuit protection structure 424, the first connection part 421 and the second connection part 422 can be the same or different.

[0067] Optionally, the embodiment of the present invention does not limit the specific shapes of the pole 5, the first connecting part 421 and the second connecting part 422. The embodiment of the present invention takes the pole 5, the first connecting part 421 and the second connecting part 422 as a rotating body structure for illustration, and other situations can refer to the settings.

[0068] Optionally, the connection between the short circuit protection structure 424 and the first connection part 421 may have an arc chamfer 4241 to enhance the structural strength of the connection between the short circuit protection structure 424 and the first connection part 421, improve the pressure bearing capacity of the short circuit protection structure 424 and improve the overcurrent performance.

[0069] Specifically, the connection between the short-circuit protection structure 424 and the first connection part 421 can have an arc chamfer 4241. In this way, when the second connection part 422 and the pole 5 are fitted together and penetrated and welded to complete the connection, the short-circuit protection structure 424 can be ensured to have a good pressure-bearing capacity, thereby avoiding the short-circuit protection structure 424 from breaking.

[0070] Optionally, the connection between the short-circuit protection structure 424 and the second connection portion 422 may also have an arc chamfer 4241 to further improve the pressure-bearing capacity of the short-circuit protection structure 424 .

[0071] Specifically, the radius of the arc chamfer 4241 can be greater than or equal to 0.1 mm. For example, the radius of the arc chamfer 4241 can be 0.1 mm, 0.2 mm, 0.8 mm, 1 mm, 1.1 mm, etc.

[0072] Optionally, the short-circuit protection structure 424 may include an aluminum alloy structure or a tin alloy structure, which is helpful to ensure that the short-circuit protection structure 424 is promptly blown when a short circuit occurs in the cylindrical battery.

[0073] Specifically, the short-circuit protection structure 424 may be made of a metal with a low melting point, such as aluminum alloy or tin alloy, to ensure the fusing property of the short-circuit protection structure 424 .

[0074] Optionally, the number of short-circuit protection structures 424 can be one, or at least two. When the number of short-circuit protection structures 424 is at least two, the at least two short-circuit protection structures 424 can be spaced apart along the circumference of the housing 1, thereby ensuring the structural stability of the cylindrical battery and effectively ensuring that the short-circuit protection structures 424 are blown in a timely manner. Furthermore, each short-circuit protection structure 424 is made of the same material and has the same or approximately the same size.

[0075] Specifically, at least two short-circuit protection structures 424 may be evenly spaced along the circumference of the shell 1 , which may further improve the structural stability of the cylindrical battery.

[0076] Specifically, each short-circuit protection structure 424 is connected between the first connection portion 421 and the second connection portion 422 .

[0077] Optionally, the cross-sectional area of a single short-circuit protection structure 424 may be 0.5-1 mm 2 The sum of the cross-sectional areas of all short-circuit protection structures 424 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 424 , and the extension direction is the direction from the first connection portion 421 to the second connection portion 422 .

[0078] In the embodiment of the present invention, the cross-sectional area of a single short-circuit protection structure 424 is controlled to be 0.5-1 mm 2 The sum of the cross-sectional areas of all short-circuit protection structures 424 is controlled to be 2-4 mm 2 , which is conducive to ensuring that the short-circuit protection structure 424 is blown in time to achieve short-circuit protection. Since the short-circuit protection structure 424 is a three-dimensional structure with a three-dimensional space, the short-circuit protection structure 424 will extend in three directions of the three-dimensional space, that is, the short-circuit protection structure 424 has a length, width and height. In this embodiment, the extension direction of the short-circuit protection structure 424 refers to the length direction of the short-circuit protection structure 424, such as Figures 9 to 11 As shown, the extension direction of the short-circuit protection structure 424 refers to the axial direction of the housing 1 .

[0079] Specifically, if Figures 9 to 11As shown, the embodiment of the present invention only takes the number of short-circuit protection structures 424 as 4, the short-circuit protection structures 424 extending along the axial direction of the shell, and the cross-sectional shape of the cross section of a single short-circuit protection structure 424 as an example. Other situations can refer to the settings, and the embodiment of the present invention does not make specific limitations on this.

[0080] Specifically, according to Q=I 2 When RT, the resistance, is large, the temperature rises instantaneously when a short circuit occurs, and the temperature rise is sufficient to melt the short-circuit protection structure 424 in time.

[0081] Specifically, in the embodiment of the present invention, the number and cross-sectional area of the short-circuit protection structure 424 can be reasonably designed to ensure that when an abnormal short circuit occurs inside the cylindrical battery, the current increases instantaneously. 2 During RT, the current at the position of the short-circuit protection structure 424 increases instantly, generating a great deal of heat. When the temperature rises, the short-circuit protection structure 424 can instantly self-fuse, disconnecting the first connection part 421 from the second connection part 422, and cutting off the path. This can prevent the cylindrical battery from exploding or spraying flames, and other violent phenomena.

[0082] Optionally, the short-circuit protection structure 424 may have a shape comprising at least one of a straight line, an arc, a broken line, and a wave. In some embodiments, the cross-sectional shape of the short-circuit protection structure 424 may comprise at least one of a circle and a polygon, making the short-circuit protection structure 424 more diverse and adaptable to different spaces.

[0083] Optionally, a gap 6 is provided between the pole 5 and the first connection portion 421 to prevent the pole 5 and the first connection portion 421 from being directly connected without passing through the short-circuit protection structure 424. In this way, in the event of a disconnection between the first connection portion 421 and the second connection portion 422, the first connection portion 421 can be prevented from being connected to the pole 5, thereby improving the reliability of the cut-off path.

[0084] Optionally, combined Figures 2 to 4 As shown, a receiving groove 51 may be provided at one end of the electrode 5 facing the battery cell 2, with the notch of the receiving groove 51 facing the battery cell 2; at least a portion of the second connecting portion 422 is embedded in the receiving groove 51 and connected to the electrode 5. In some embodiments, the surface of the second connecting portion 422 facing the bottom wall of the receiving groove 51 is welded to the bottom wall of the receiving groove 51.

[0085] In an embodiment of the present invention, at least a portion of the second connecting portion 422 is embedded in the accommodating groove 51, so that the accommodating groove 51 can limit the second connecting portion 422, thereby ensuring the reliability of the connection between the second connecting portion 422 and the pole 5 and making the structure of the cylindrical battery more compact.

[0086] Specifically, the second connection portion 422 may be bonded to the accommodating groove 51 by means of conductive adhesive, or the second connection portion 422 may be fixed to the bottom wall of the accommodating groove 51 by welding.

[0087] Specifically, the notch of the accommodating groove 51 is arranged toward the battery core 2 , and the accommodating groove 51 is communicated with the interior of the housing 1 .

[0088] Specifically, along the axial direction of the housing 1, there is a gap 6 between the pole 5 and the first connecting portion 421, which can also improve the installation convenience of installing the second connecting portion 422 into the receiving groove 51. For example, the gap 6 can be 0.1mm, 0.2mm, 0.3mm, etc.

[0089] Optionally, the pole 5 may be provided with a first liquid injection hole 54, and the second connecting portion 422 may be provided with a second liquid injection hole 4221; the first liquid injection hole 54 may pass through the pole 5 along the axial direction of the shell 1, and the first liquid injection hole 54 may pass through the bottom wall of the accommodating groove 51; the second liquid injection hole 4221 passes through the second connecting portion 422 along the axial direction of the shell 1, and the second liquid injection hole 4221 is opposite to and connected to the first liquid injection hole 54.

[0090] In the embodiment of the present invention, since at least a portion of the second connecting portion 422 is embedded in the accommodating groove 51, the first liquid injection hole 54 can pass through the bottom wall of the accommodating groove 51, so that the second liquid injection hole 4221 and the first liquid injection hole 54 are opposite and connected, and the electrolyte is then injected into the battery cell 2 through the second liquid injection hole 4221 and the first liquid injection hole 54.

[0091] Specifically, one end of the first injection hole 54 can penetrate the bottom wall of the stepped groove 52, and the other end can penetrate the bottom wall of the accommodating groove 51, so that the stepped groove 52 is connected to the accommodating groove 51 through the first injection hole 54. The electrolyte can be injected from the stepped groove 52 into the first injection hole 54, and then flow into the interior of the housing 1 through the second injection hole 4221. In this way, in addition to connecting the battery cell 2 inside the cylindrical battery to the external circuit, the terminal 5 can also assist in the introduction of the electrolyte during the manufacturing process of the cylindrical battery.

[0092] In some embodiments, the first connection portion 421 and the second connection portion 422 are arranged at intervals along the axial direction of the shell 1, and at least two short-circuit protection structures 424 are arranged at intervals along the circumferential direction of the shell 1, and each short-circuit protection structure 424 is connected between the first connection portion 421 and the second connection portion 422; the first connection portion 421, the second connection portion 422 and the two adjacent short-circuit protection structures 424 enclose a first avoidance hole 425, and the first liquid injection hole 54, the second liquid injection hole 4221 and the first avoidance hole 425 constitute a channel for electrolyte circulation, so that the electrolyte injected through the first liquid injection hole 54 flows to the battery cell 2 in turn through the second liquid injection hole 4221 and the first avoidance hole 425.

[0093] In some embodiments, the first connection portion 421 is provided with a second avoidance hole 4211, which passes through the first connection portion 421 along the axial direction of the shell 1 and is connected to the second liquid injection hole 4221. The first liquid injection hole 54, the second liquid injection hole 4221 and the second avoidance hole 4211 constitute a channel for electrolyte circulation, so that the electrolyte injected through the first liquid injection hole 54 flows to the battery cell 2 in turn through the second liquid injection hole 4221 and the second avoidance hole 4211.

[0094] In some embodiments, the first connection portion 421 and the second connection portion 422 are arranged at intervals along the axial direction of the shell 1, and at least two short-circuit protection structures 424 are arranged at intervals along the circumferential direction of the shell 1, and each short-circuit protection structure 424 is connected between the first connection portion 421 and the second connection portion 422; the first connection portion 421, the second connection portion 422 and the two adjacent short-circuit protection structures 424 enclose a first avoidance hole 425, and the first connection portion 421 is provided with a second avoidance hole 4211, the second avoidance hole 4211 passes through the first connection portion 421 along the axial direction of the shell 1 and is connected to the second liquid injection hole 4221, the first liquid injection hole 54, the second liquid injection hole 4221 and the second avoidance hole 4211 constitute a first channel for electrolyte circulation, and the first liquid injection hole 54, the second liquid injection hole 4221 and the second avoidance hole 4211 constitute a second channel for electrolyte circulation, and the electrolyte injected through the first liquid injection hole 54 can flow to the battery cell 2 through the first channel and the second channel.

[0095] In an embodiment of the present utility model, the electrolyte can pass through the second liquid injection hole 4221. On the one hand, it can flow out of the second collecting plate 42 through the first avoidance hole 425, and then flow to the battery cell 2 to replenish the electrolyte for the battery cell 2; on the other hand, it can also flow out of the second collecting plate 42 through the second avoidance hole 4211, and then flow to the battery cell 2 to replenish the electrolyte for the battery cell 2.

[0096] Alternatively, as Figure 1 、 Figure 8As shown, the cylindrical battery further includes a first cover plate 31 and a second cover plate 32. A stepped groove 52 is provided at the end of the pole 5 facing away from the battery cell 2, and the notch of the stepped groove 52 is arranged toward the outside of the shell 1; the first liquid injection hole 54 passes through the bottom wall of the stepped groove 52; the first cover plate 31 is connected to the first current collecting plate 41 and is sealed to the first end 12; the second cover plate 32 is sealed in the stepped groove 52.

[0097] In an embodiment of the present utility model, the first cover plate 31 is sealed to the first end 12, and the second cover plate 32 is sealed to the stepped groove 52, so as to facilitate sealing the battery cell 2, the first current collecting disc 41 and the second current collecting disc 42 inside the shell 1 to protect the battery cell 2, the first current collecting disc 41 and the second current collecting disc 42, and also to avoid leakage of the electrolyte.

[0098] Specifically, the first liquid injection hole 54 passes through the bottom wall of the stepped groove 52 , so as to facilitate the injection of electrolyte from the stepped groove 52 into the first liquid injection hole 54 .

[0099] Optionally, the second cover plate 32 is spaced apart from the bottom wall of the stepped groove 52 to facilitate penetration welding of the second connecting portion 422 and the bottom wall of the accommodating groove 51 from the bottom wall side of the stepped groove 52 .

[0100] Optionally, the stepped groove 52 may include a first groove 521, a second groove 522 and a third groove 523; along the direction from the second current collecting plate 42 to the first current collecting plate 41, the first groove 521, the second groove 522 and the third groove 523 are connected in sequence, and the groove opening sizes of the first groove 521, the second groove 522 and the third groove 523 are reduced in sequence; the second cover plate 32 can be arranged in the second groove 522, and welded and fixed to the groove side wall of the second groove 522 to seal the groove opening of the third groove 523, which can avoid leakage of electrolyte, and the second cover plate 32 is spaced apart from the bottom wall of the third groove 523, which can improve the convenience of penetrating welding the second connecting portion 422 and the bottom wall of the accommodating groove 51 from the bottom wall side of the third groove 523.

[0101] Specifically, combined Figure 5 、 Figure 8 and Figure 9 As shown, the bottom wall of the accommodating groove 51 can serve as the first welding surface 511, the surface of the second connecting portion 422 opposite to the bottom wall of the accommodating groove 51 is the second welding surface 423, and the bottom wall of the third groove 523 can serve as the third welding surface 524. Penetration welding can be performed through the third welding surface 524, so that the first welding surface 511 and the second welding surface 423 are welded into one.

[0102] Specifically, the second cover plate 32 is fixed in the second groove 522, which can prevent the second cover plate 32 from protruding from the surface of the pole 5 facing away from the battery cell 2, that is, the outer surface, thereby improving the reliability of the pole 5 connecting to the external circuit.

[0103] Specifically, along the axial direction of the housing 1 , the depth of the second groove 522 is greater than or equal to 0.1 mm, so as to further effectively prevent the second cover plate 32 from protruding from the outer surface of the pole 5 .

[0104] Specifically, the first cover plate 31 is directly connected to the first end 12 , the second cover plate 32 is connected to the pole 5 , and the pole 5 is insulatedly connected to the second end 13 , that is, the second cover plate 32 is indirectly connected to the second end through the pole 5 .

[0105] Specifically, the first cover plate 31 , the second cover plate 32 and the housing 1 may all be rigid structures made of metal materials to ensure the structural strength of the cylindrical battery and protect the internal components of the cylindrical battery.

[0106] Specifically, the shell 1 can be a cylindrical body with a hollow interior and open ends, such as Figure 12 As shown, the first end 12 can be provided with a first opening 14, and the second end 13 can be provided with a second opening 15. The first cover plate 31 can be connected to the first opening 14 and used to block the first opening 14. The pole 5 is passed through the second opening 15, and the pole 5 is insulated and connected to the edge of the second opening 15 to block the second opening 15. Moreover, the second cover plate 32 is connected to the second groove 522 on the pole 5, so that the first cover plate 31, the housing 1, the second cover plate 32 and the pole 5 can enclose to form the accommodating cavity 11.

[0107] In other cases, the housing 1 may be hollow inside, and the second end 13 may have an open cylinder.

[0108] Specifically, the first cover plate 31 and the shell 1 can be sealed and fixedly connected, the pole 5 and the second end 13 of the shell 1 can be sealed and fixedly connected, and the second cover plate 32 can be sealed and fixed in the second groove 522 to improve the sealing and waterproof properties of the accommodating cavity 11.

[0109] Alternatively, as Figure 4 As shown, the cylindrical battery further includes an insulating member 7, such as Figures 6 to 8 As shown, the pole 5 is provided with an annular groove 53, the notch of the annular groove 53 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 53; the insulating member 7 is provided between the second end 13 of the housing 1 and the pole 5, and the insulating member 7 is partially embedded in the annular groove 53.

[0110] In the embodiment of the present invention, the second end 13 of the housing 1 is embedded in the annular groove 53 of the terminal 5, so that the housing 1 and the terminal 5 can be riveted. In addition, an insulating member 7 is provided between the second end 13 of the housing 1 and the terminal 5 to achieve an insulated connection between the second end 13 of the housing 1 and the terminal 5, thereby preventing electrical conduction between the housing 1 and the terminal 5, thereby preventing short circuits in the cylindrical battery and improving the safety of the cylindrical battery.

[0111] Specifically, the annular groove 53 can be provided on the outer side wall of the pole 5 , so that the pole 5 at least partially extends out of the housing 1 , thereby facilitating connection of the cylindrical battery with an external circuit through the pole 5 .

[0112] Optionally, the insulating member 7 may include a first insulating component 71 and a second insulating component 72 , which may be embedded in the annular groove 53 and combined to form an annular space, in which at least a portion of the housing 1 may be accommodated.

[0113] Optionally, the second insulating component 72 may include a first insulating segment 721 and a second insulating segment 722, both of which are annular structures. The outer diameter of the first insulating segment 721 may be smaller than the inner diameter of the second insulating segment 722. In this way, the second insulating component 72 may be spliced together, which can improve the convenience of riveting the shell 1 and the pole 5.

[0114] For example, the steps of assembling the cylindrical battery in the embodiment of the present invention may include:

[0115] S1: Rivet the insulating member 7, the housing 1 and the pole 5 to fasten them together;

[0116] 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;

[0117] S3: Encapsulate the battery cell 2 with rubber and install it into the housing 1 from the first end 12 of the housing 1;

[0118] S4: Apply appropriate pressure to the battery cell 2 so that the second connecting portion 422 is embedded in the receiving groove 51 and the second welding surface 423 is aligned with the first welding surface 511, and then penetration welding is performed through the third welding surface 524 to complete the electrical connection of the positive electrode of the cylindrical battery;

[0119] S5: Close the first cover plate 31 and the first end 12 of the housing 1 , and perform penetration welding on the first cover plate 31 and the first current collecting plate 41 ;

[0120] S6: Sealing welding the first cover plate 31 and the housing 1;

[0121] S7: The battery cell 2 is placed upright, and the electrolyte is injected through the first injection hole 54 and the second injection hole 4221;

[0122] S8: Assemble the second cover plate 32 and the pole 5 to install the second cover plate 32 into the second groove 522, perform sealing welding, and complete the sealing of the cylindrical battery.

[0123] Specifically, the test items are the cylindrical battery in the present invention and the traditional cylindrical battery. The two are used as comparison items to compare the battery safety performance of the two under the same conditions of the needle puncture test. The number of samples can be 100 groups. The factor X1 is whether it has a short-circuit protection structure 424, and the corresponding result is Y1, which is the proportion of battery explosion or flame ejection. Among them, the difference between the two cylindrical batteries is that the cylindrical battery in the present invention has a short-circuit protection structure 424 (four short-circuit protection structures are evenly distributed), while the traditional cylindrical battery does not have a short-circuit protection structure 424, and one end of the second current collecting plate 42 is directly welded to the pole 5. The pole 5 is inserted into the second end 13 of the shell 1, and the end facing away from the second current collecting plate 42 is exposed outside the shell 1. The pole 5 is not provided with a accommodating groove 51, a stepped groove 52, and a first liquid injection hole 54.

[0124] Furthermore, the test conditions include: 1. Design of the incoming battery cell 2, the tab forming method of the incoming battery cell 2 is cutting and stacking, the tabs are provided at both ends of the battery cell 2, the total height tolerance of the battery cell 2 is designed to be ±0.2mm, and the isolation film is a 12μm PP base film. 2. Laser usage: The laser used to weld the battery cell 2 and the first current collecting tray 41 is an IPG YLS-1000 / 1000-SM-AMB. The laser used to weld the battery cell 2 and the second current collecting tray 42 is an IPG YLR-2000-SM. The laser used to weld the second current collecting tray 42 and the bottom wall of the accommodating tank 51 is an IPG YLR-2000-SM. The laser used to weld the first cover plate 31 and the first current collecting tray 41 is an IPG YLR-2000-SM. The laser used to weld the first cover plate 31 and the housing 1 is an IPG YLS-2000 / 2000-AMB. The laser used to weld the second cover plate 32 and the sidewall of the second tank 522 is an IPG YLS-2000 / 2000-SM-AMB. The list item is the proportion of cylindrical battery explosions or flame sprays, which is required to be less than 0%. The detection method is through observation and statistical analysis.

[0125] The experimental results are as follows Figure 13 As shown, the cylindrical battery of the present invention has a 0% explosion or flame ejection rate in the needle penetration test, which can effectively improve the safety of the cylindrical battery. In particular, from the disassembly effect, after the needle penetration, the short-circuit protection structure 424 is completely melted, and the protection effect is significant.

[0126] Specifically, a two-proportion hypothesis test was conducted on the explosion or flame ejection rates of cylindrical batteries with different cylindrical battery structures in the needle penetration test. Null hypothesis: There is no significant difference in the explosion or flame ejection rates between the cylindrical battery of the utility model and the traditional cylindrical battery; alternative hypothesis: The explosion or flame ejection rate of the cylindrical battery of the utility model is less than the explosion or flame ejection rate of the traditional cylindrical battery.

[0127] Hypothesis test results:

[0128] Two Proportion Tests and Confidence Intervals

[0129]

[0130] Difference = p(1) - p(2), Difference Estimate: -0.89, 95% Upper Confidence Limit for Difference: -0.838534. Test for Difference = 0 (vs. < 0): Z = -28.44, P value = 0.000. Fisher's Exact Test: P value = 0.000. P value < 0.05, accept the alternative hypothesis.

[0131] Sample calculation as Figure 14 As shown in the figure, under the statistical defective rate, the sample size power value of 100 reaches 100%, and the sample size meets the judgment.

[0132] The cylindrical battery described in the embodiment of the present utility model has at least the following advantages:

[0133] In an embodiment of the present invention, the first current collecting disc 41 is connected to the third end 21 of the battery cell 2, the first connection portion 421 of the second current collecting disc 42 is connected to the fourth end 22 of the battery cell 2, and the second connection portion 422 of the second current collecting disc 42 is connected to the terminal 5. The second connection portion 422 and the first connection portion 421 are connected via a short-circuit protection structure 424. Thus, in the cylindrical battery, the battery cell 2 is connected to the external circuit via the first connection portion 421, the short-circuit protection structure 424, the second connection portion 422, and the terminal 5 in sequence, forming a pathway. When the short-circuit protection structure 424 blows, the second connection portion 422 and the first connection portion 421 are disconnected, thereby disconnecting the pathway. This can provide short-circuit protection for the cylindrical battery and improve the safety of the cylindrical battery.

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

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

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

[0137] In an embodiment of the present invention, the first current collecting disc 41 is connected to the third end 21 of the battery cell 2, the first connection portion 421 of the second current collecting disc 42 is connected to the fourth end 22 of the battery cell 2, and the second connection portion 422 of the second current collecting disc 42 is connected to the terminal 5. The second connection portion 422 and the first connection portion 421 are connected via a short-circuit protection structure 424. Thus, in the cylindrical battery, the battery cell 2 is connected to the external circuit via the first connection portion 421, the short-circuit protection structure 424, the second connection portion 422, and the terminal 5 in sequence, forming a pathway. When the short-circuit protection structure 424 blows, the second connection portion 422 and the first connection portion 421 are disconnected, thereby disconnecting the pathway. This can provide short-circuit protection for the cylindrical battery and improve the safety of the cylindrical battery.

[0138] The cylindrical battery and electrical equipment provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

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 a pole (5); The interior of the housing (1) is hollow, and the housing (1) has a first end (12) and a second end (13) that are 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); The second current collecting disk (42) comprises a first connecting portion (421), a second connecting portion (422) and a short-circuit protection structure (424), wherein the first connecting portion (421) is connected to the fourth end (22), the second connecting portion (422) is connected to the pole (5), and the pole (5) is provided through the second end (13) and is insulated from the second end (13); The short-circuit protection structure (424) is connected between the first connection part (421) and the second connection part (422), and when the short-circuit protection structure (424) is fused, the first connection part (421) and the second connection part (422) can be disconnected.

2. The cylindrical battery according to claim 1, characterized in that: The number of the short-circuit protection structures (424) includes at least two; At least two short-circuit protection structures (424) are arranged at intervals along the circumference of the housing (1), and each short-circuit protection structure (424) is connected between the first connecting portion (421) and the second connecting portion (422); And / or, the short circuit protection structure (424) includes 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 (424) is 0.5-1 mm2, and the sum of the cross-sectional areas of all the short-circuit protection structures (424) is 2-4 mm2; The cross section is a cross section obtained by cutting along a direction perpendicular to the extension direction of the short-circuit protection structure (424), and the extension direction is the direction from the first connecting portion (421) to the second connecting portion (422).

4. The cylindrical battery according to claim 1, characterized in that A connection point between the short-circuit protection structure (424) and the first connection portion (421) has an arc chamfer (4241).

5. The cylindrical battery according to claim 1, characterized in that: A gap (6) is provided between the pole (5) and the first connecting portion (421).

6. The cylindrical battery according to claim 1, characterized in that An accommodating groove (51) is provided at one end of the pole (5) facing the battery core (2), and a notch of the accommodating groove (51) is provided facing the battery core (2); At least a portion of the second connecting portion (422) is embedded in the accommodating groove (51) and connected to the pole (5).

7. The cylindrical battery according to claim 6, characterized in that: The pole (5) is provided with a first liquid injection hole (54), and the second connecting portion (422) is provided with a second liquid injection hole (4221); The first liquid injection hole (54) penetrates the pole (5) along the axial direction of the housing (1), and the first liquid injection hole (54) penetrates the bottom wall of the accommodating groove (51); The second liquid injection hole (4221) passes through the second connecting portion (422) along the axial direction of the shell (1), and the second liquid injection hole (4221) is opposite to and communicates with the first liquid injection hole (54).

8. The cylindrical battery according to claim 7, characterized in that: The cylindrical battery further comprises a first cover plate (31) and a second cover plate (32); a stepped groove (52) is provided at one end of the pole (5) facing away from the battery cell (2); the notch of the stepped groove (52) is arranged toward the outside of the housing (1); and the first injection hole (54) penetrates the bottom wall of the stepped groove (52); The first cover plate (31) is connected to the first collecting plate (41) and is sealed to the first end (12); The second cover plate (32) is sealed and connected in the stepped groove (52).

9. The cylindrical battery according to claim 8, characterized in that: The stepped groove (52) comprises a first groove (521), a second groove (522) and a third groove (523); along the direction from the second current collecting plate (42) to the first current collecting plate (41), the first groove (521), the second groove (522) and the third groove (523) are sequentially connected, and the slot sizes of the first groove (521), the second groove (522) and the third groove (523) decrease sequentially; The second cover plate (32) is disposed in the second groove (522) and is welded and fixed to the groove side wall of the second groove (522) to seal the groove opening of the third groove (523).

10. The cylindrical battery according to claim 7, characterized in that: The first connecting portion (421) and the second connecting portion (422) are arranged at intervals along the axial direction of the housing (1); at least two short-circuit protection structures (424) are arranged at intervals along the circumference of the housing (1); and each short-circuit protection structure (424) is connected between the first connecting portion (421) and the second connecting portion (422); The first connecting portion (421), the second connecting portion (422) and two adjacent short-circuit protection structures (424) enclose a first avoidance hole (425), and the first liquid injection hole (54), the second liquid injection hole (4221) and the first avoidance hole (425) form a channel for electrolyte circulation; And / or, the first connecting portion (421) is provided with a second avoidance hole (4211), the second avoidance hole (4211) passes through the first connecting portion (421) along the axial direction of the shell (1) and is connected to the second injection hole (4221), and the first injection hole (54), the second injection hole (4221) and the second avoidance hole (4211) constitute a channel for the circulation of electrolyte.

11. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further comprises an insulating member (7), the pole (5) is provided with an annular groove (53), and the notch of the annular groove (53) 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 (53); The insulating member (7) is arranged between the second end (13) of the housing (1) and the pole (5), and is partially embedded in the annular groove (53).

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

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