Cylindrical battery and battery pack

Abstract

The cylindrical battery comprises a shell, a pole, a battery cell, a collector plate and a fastener, one end of the shell is provided with an opening, the pole is in insulated connection with the shell and covers the opening, the pole is provided with a through hole to communicate the interior of the shell with the exterior of the battery, and the battery cell and the collector plate are arranged in the shell. The first collector plate is electrically connected with the battery cell and the pole, and the fastener at least partially penetrates through the through hole and is in threaded connection with the first collector plate. The battery pack comprises the cylindrical battery. According to the invention, the battery cell and the collector plate are connected through the fastener, so that the product yield can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cylindrical battery and a battery pack. Background Art

[0002] The existing cylindrical batteries generally have the poles and current collectors fixed by ultrasonic torque welding or other methods. This design, if there is no good cold weld detection method, can easily lead to many defective products flowing into the next process. It is also easy to generate particles during welding. In addition, the space inside the battery shell is limited, making dust removal difficult, which can easily cause battery cell damage or short circuit. Utility Model Content

[0003] The purpose of this application is to provide a cylindrical battery and a battery pack to solve the technical problems that welding and fixing between the pole and the collector plate may bring about the risk of cold welding and the risk of generating particles and causing damage to the battery cell or short circuit. The technical solution is as follows:

[0004] The cylindrical battery of the embodiment of the present application has a first direction and a second direction arranged vertically, and the cylindrical battery includes:

[0005] A shell having a receiving cavity and an opening at one end in a first direction;

[0006] A pole, the pole is insulated and connected to the shell and covers the opening, the pole is provided with a through hole, and the through hole penetrates the pole along a first direction to communicate with the accommodating cavity and the outside of the cylindrical battery respectively;

[0007] A battery cell, wherein the battery cell is arranged in the accommodating cavity;

[0008] A first current collecting disk, which is arranged in the accommodating cavity and located on a side of the battery cell facing the pole, and is electrically connected to the battery cell and the pole respectively;

[0009] A fastener is at least partially penetrated through the through hole and is threadedly connected to the first collecting plate.

[0010] Optionally, the fastener includes a stop portion and a fixing portion connected to the stop portion, the stop portion and the fixing portion are distributed along the first direction, and a size of the stop portion in the second direction is greater than a size of the fixing portion in the second direction;

[0011] The hole wall of the through hole is provided with a limiting boss, which extends from the hole wall toward the direction of the central axis of the through hole. The fixing part passes through the limiting boss and is threadedly connected with the first collecting plate. The stop part and the limiting boss abut against each other in the first direction.

[0012] Optionally, the first current collecting plate includes a main body and a first protrusion, the main body is electrically connected to the battery cell, the first protrusion is arranged on one side of the main body in the first direction, the first protrusion is penetrated into the through hole and is threadedly connected to the fastener.

[0013] Optionally, the outer side wall of the fastener is provided with a first external thread structure, the end of the first protrusion away from the main body is provided with a first connecting hole, the inner side wall of the first connecting hole is provided with a first internal thread structure matching the first external thread structure, and the fastener is inserted into the first connecting hole and threadedly connected with the first collecting plate through the cooperation of the first external thread structure and the first internal thread structure; or

[0014] A second connecting hole is set at one end of the fastener facing the battery cell, the inner wall of the second connecting hole is set with a second internal thread structure, the outer wall of the first protrusion is set with a second external thread structure, the first protrusion is inserted into the second connecting hole and is threadedly connected with the fastener through the cooperation of the second external thread structure and the second internal thread structure.

[0015] Optionally, the cylindrical battery further includes a seal, and the stop portion and the pole are sealed by the seal.

[0016] Optionally, the sealing member includes a sealant, and the sealant is sealingly disposed in the through hole and located at the periphery of the stop portion.

[0017] Optionally, the sealant has a first surface facing away from the battery cell, the pole has a second surface facing away from the battery cell, and the first surface is closer to the battery cell relative to the second surface or the first surface is flush with the second surface.

[0018] Optionally, an inner side wall of the through hole and / or an outer side wall of the stop portion is provided with a glue containing groove, and at least a portion of the sealant is contained in the glue containing groove.

[0019] Optionally, the first collecting plate also includes a second protrusion, the main body, the second protrusion and the first protrusion are distributed along the first direction, the size of the second protrusion in the second direction is larger than the size of the first protrusion in the second direction, and the size of the second protrusion in the second direction is smaller than the size of the main body in the second direction.

[0020] Optionally, the fastener is a conductive fastener.

[0021] The battery pack of the embodiment of the present application includes the above-mentioned cylindrical battery.

[0022] The cylindrical battery of the present application has at least the following beneficial effects: the cylindrical battery of the present application fixes the pole and the collector plate by setting a through hole on the pole and using a fastener to thread the collector plate. This design does not produce the risk of cold welding brought by traditional welding methods and the risk of generating particles that cause damage to the battery cell or short circuit, and can effectively improve the product yield.

[0023] The battery pack of the present application may include all the technical features and beneficial effects of the above-mentioned cylindrical battery, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of a cylindrical battery provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of the exploded structure of a cylindrical battery provided in one embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a half-section structure of a cylindrical battery provided in one embodiment of the present application;

[0028] Figure 4 yes Figure 3 An enlarged schematic diagram of the structure shown at position I;

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of a pole provided in an embodiment of the present application;

[0030] Figure 6 It is a schematic diagram of a half-section structure of a pole provided in an embodiment of the present application;

[0031] Figure 7 is a schematic diagram of the three-dimensional structure of a first current collecting plate provided in an embodiment of the present application;

[0032] Figure 8 is a schematic diagram of a half-section structure of a first current collecting disk provided in an embodiment of the present application;

[0033] Fig. 9 is a schematic diagram of the three-dimensional structure of a fastener provided in one embodiment of the present application;

[0034] Fig.10 is a schematic diagram of a half-section structure of a fastener provided in one embodiment of the present application;

[0035] Fig.11 is a schematic diagram of a half-section structure of a cylindrical battery provided in another embodiment of the present application;

[0036] Fig.12 yes Fig.11 An enlarged schematic diagram of the structure shown at position II;

[0037] Fig.13 is a schematic diagram of the three-dimensional structure of a first current collecting plate provided in another embodiment of the present application;

[0038] Fig.14 is a schematic diagram of a half-section structure of a first current collecting plate provided in another embodiment of the present application;

[0039] Fig.15is a schematic diagram of the three-dimensional structure of a fastener provided in another embodiment of the present application;

[0040] Fig.16 It is a schematic diagram of a half-section structure of a fastener provided in another embodiment of the present application.

[0041] Figure markings: 1-shell, 11-accommodating cavity, 12-opening, 13-open end, 2-pole, 21-through hole, 211-first hole portion, 212-second hole portion, 213-glue storage groove, 22-limiting boss, 23-second surface, 3-battery cell, 4-first current collecting plate, 41-main body, 42-first protruding portion, 421-first connecting hole, 422-first internal thread structure, 423-second external thread structure, 43-second protruding portion, 5-fastener, 51-stop portion, 511-groove structure, 52-fixing portion, 521-first external thread structure, 522-second connecting hole, 523-second internal thread structure, 6-sealing member, 61-first surface, 7-insulating rubber ring, 8-insulating gasket, 9-second current collecting plate, 10-cover plate, Z-first direction, X-second direction. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0043] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein, unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0044] The embodiment of the present application provides a battery pack, which includes a box and a cylindrical battery, wherein the cylindrical battery is arranged in the box. Since the specific structure of the box and the arrangement between the cylindrical battery and the box can be realized by using the existing technology, and they are not the focus of the present application, they will not be described in detail in this embodiment.

[0045] The cylindrical battery includes a housing 1, a pole 2, a battery cell 3, a first current collecting plate 4 and a fastener 5. Figures 1 to 16 The technical solution of this application is described. In order to more clearly describe the technical solution, the following definition is given: Figure 1 The first direction Z and the second direction X shown in FIG. are perpendicular to each other, wherein the first direction Z corresponds to the axial direction of the cylindrical battery, and the second direction X corresponds to the radial direction of the cylindrical battery. It should be noted here that Figure 1 The second direction X shown in the figure is only a schematic representation and does not mean that it is limited to this single direction. In this embodiment, the second direction X refers to any radial direction of the cylindrical battery.

[0046] The housing 1 has a housing cavity 11 . One end of the housing 1 in the first direction Z has an opening 12 communicating with the housing cavity 11 . The aperture of the opening 12 is smaller than the diameter of the housing cavity 11 .

[0047] The pole 2 is insulated and connected to the housing 1 and covers the opening 12. The pole 2 can pass through the opening 12 and be fixed to the end of the housing 1 by riveting. The pole 2 and the housing 1 can be insulated by providing an insulating rubber ring 7 and an insulating gasket 8. Since this part of the structure can be implemented by using existing technology and it is not the focus of protection of this application, it will not be described in detail in this embodiment. The pole 2 is provided with a through hole 21, which passes through the pole 2 along a first direction, such as Figure 6 As shown, when the pole 2 covers the opening 12, the accommodating cavity 11 can communicate with the outside of the cylindrical battery.

[0048] The first current collecting disc 4 and the battery cell 3 are both arranged in the accommodating cavity 11, and the first current collecting disc 4 is located on the side of the battery cell 3 facing the pole 2. The first current collecting disc 4 is electrically connected to the battery cell 3. Since the specific structure and arrangement of the battery cell 3 can be realized by the existing technology, and it is not the focus of protection of this application, it will not be described in detail in this embodiment.

[0049] The fastener 5 is at least partially disposed in the through hole 21 and is threadedly connected to the first current collecting plate 4 , so that the pole 2 and the first current collecting plate 4 are electrically connected, and the accommodating cavity 11 is sealed from the outside.

[0050] The cylindrical battery of the present application connects the pole 2 and the first current collecting disk 4 and realizes electrical conduction by setting a through hole 21 on the pole 2 and using a fastener 5 to be threadedly connected to the first current collecting disk 4. This design does not produce the risk of cold welding caused by traditional welding methods and the risk of generating particles that cause damage to the battery cell 3 or short circuit, and can effectively improve the product yield.

[0051] Reference Figures 3 to 6, which schematically shows a preferred embodiment, the fastener 5 includes a stop portion 51 and a fixing portion 52 connected to the stop portion 51, the stop portion 51 and the fixing portion 52 are distributed along the first direction Z, and the size of the stop portion 51 in the second direction X is greater than the size of the fixing portion 52 in the second direction X. The hole wall of the through hole 21 is provided with a limiting boss 22, and the limiting boss 22 extends from the hole wall toward the direction where the central axis of the through hole 21 is located, thereby forming a through hole in the middle of the limiting boss 22. The fixing portion 52 is threadedly connected to the first collector 4 through the through hole in the middle of the limiting boss 22. The stop portion 51 and the limiting boss 22 abut against each other in the first direction Z to limit the stop portion 51 from moving toward the battery cell 3. The size H1 of the pole 2 in the first direction Z is preferably 1.5mm-5.0mm. H1 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, any one of the values ​​or the range between any two values. The size L1 of the through hole 21 in the second direction X is preferably 4mm-7mm. L1 can be 4mm, 5mm, 6mm, 7mm, any one of the values ​​or the range between any two values. The dimension L2 of the stopper 51 in the second direction X is preferably 4 mm.

[0052] Figure 6A preferred embodiment is schematically shown in the figure, in which the limiting boss 22 separates the through hole 21 into a first hole portion 211 and a second hole portion 212 that are interconnected. The first hole portion 211 is arranged close to the battery cell 3, and the second hole portion 212 is arranged away from the battery cell 3. The first hole portion 211 and the second hole portion 212 are connected through the middle hole of the limiting boss 22. The dimension H2 of the limiting boss 22 in the first direction Z is preferably 0.2mm-0.5mm. H2 can be any one of 0.2mm, 0.3mm, 0.4mm, 0.5mm or a range between any two values. The extension dimension L3 of the limiting boss 22 in the second direction X is preferably 2mm. The dimension H3 of the first hole portion 211 in the first direction Z is preferably 1.5mm-5.0mm. H3 can be any one of 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm or a range between any two values. It should be noted that the size H1 of the pole 2 and the size H3 of the first hole 211 are only preferred solutions. In specific implementation, the specific sizes of the two can be matched and set according to design requirements. The stop portion 51 is located in the second hole portion 212, and the fixing portion 52 penetrates into the first hole portion 211 through the through hole in the middle of the limiting boss 22. Of course, the above is only a preferred embodiment. In other embodiments, the limiting boss 22 can also extend along the first direction Z toward the direction close to the battery cell 3, that is, the second hole portion 212 is formed in the through hole 21 only on the side of the limiting boss 22 away from the battery cell 3, the stop portion 51 is located in the second hole portion 212, and the fixing portion 52 is penetrated in the through hole in the middle of the limiting boss 22. Preferably, a groove structure 511 can be provided on the end side of the stop portion 51 away from the fixing portion 52, such as Fig. 9 In the preferred solution schematically shown in the figure, a cross-shaped groove structure 511 is provided at one end of the stop portion 51 away from the fixing portion 52, so that the fastener 5 can be easily rotated using a cross screwdriver or other tools. Of course, the above is only a preferred embodiment. In other embodiments, the end of the stop portion 51 away from the fixing portion 52 may also be provided with a groove structure 511 of other shapes, or a convex structure of a set shape, or the radial cross-section shape of the fixing portion 52 may be designed to be a polygon, etc.

[0053] In a preferred embodiment, the first current collecting plate 4 includes a main body 41 and a first protrusion 42, and the main body 41 is electrically connected to the battery cell 3. The dimension H4 of the main body 41 in the first direction Z is preferably 0.3 mm. The first protrusion 42 is arranged on one side of the main body 41 in the first direction Z, and the first protrusion 42 penetrates into the through hole 21 and is threadedly connected to the fastener 5.

[0054] like Figures 7 to 10 In a preferred embodiment shown in the figure, the radial cross section of the fixing portion 52 of the fastener 5 is circular, and the outer wall of the fixing portion 52 is provided with a first external thread structure 521. The end of the first protrusion 42 away from the main body 41 is provided with a first connecting hole 421, and the radial cross section of the first connecting hole 421 is circular. The inner wall of the first connecting hole 421 is provided with a first internal thread structure 422 that matches the first external thread structure 521. The fixing portion 52 of the fastener 5 penetrates into the first connecting hole 421 and is threadedly connected to the first collecting plate 4 through the cooperation of the first external thread structure 521 and the first internal thread structure 422, as shown in FIG. Figure 3 and Figure 4In this embodiment, the radial cross-sectional shape of the first protrusion 42 is not limited to a circle, and may also be a square, a hexagon or other polygon. The dimension H5 of the first protrusion 42 in the first direction Z is preferably 1.5 mm to 5.0 mm. H5 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, any one of the values ​​or the range between any two values. The dimension L4 of the first protrusion 42 in the second direction X is preferably 4mm-7mm. L4 can be 4mm, 5mm, 6mm, 7mm, any one of the values ​​or the range between any two values. The distance L5 between the hole wall of the first connection hole 421 and the outer wall of the first protrusion 42 is preferably 1 mm. The first internal thread structure 422 preferably extends from the end of the first protrusion 42 away from the main body 41 toward the main body 41. The dimension H6 of the first internal thread structure 422 in the first direction Z is preferably 1.3 mm-4.5 mm. H6 can be any value of 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, and 4.5mm, or a range between any two values.

[0055] like Figures 11 to 16 In another preferred embodiment shown, a second connection hole 522 is provided at one end of the fastener 5 facing the battery cell 3. The radial cross section of the second connection hole 522 is circular, and the inner side wall of the second connection hole 522 is provided with a second internal thread structure 523. The radial cross section of the first protrusion 42 is circular, and the outer side wall of the first protrusion 42 is provided with a second external thread structure 423. The first protrusion 42 penetrates into the second connection hole 522 and is threadedly connected to the fastener 5 through the cooperation of the second external thread structure 423 and the second internal thread structure 523.

[0056] Of course, the above are only preferred embodiments. In another embodiment, the first current collecting plate 4 may not be provided with the first protrusion 42, that is, the first current collecting plate 4 only includes the body 41, and the fixing portion 52 passes through the through hole in the middle of the limiting boss 22 and is directly threadedly connected with the body 41. In another embodiment, the first protrusion 42 may not be inserted into the through hole 21.

[0057] In a further preferred embodiment, the stopper 51 and the pole 2 are sealed by a seal 6. Figure 3 and Figure 4 or Fig.11 and Fig.12 In a preferred embodiment shown in , the sealing member 6 is made of sealant, which is sealed in the through hole 21 and located on the periphery of the stopper 51. Of course, the above is only a preferred embodiment. In other embodiments, other forms of sealants 6 may be used to seal between the stopper 51 and the pole 2, such as a sealing ring. During implementation, a sealing groove may be provided on the side of the limiting boss 22 facing the stopper 51, and the sealing groove ring is provided on the periphery of the through hole in the middle of the limiting boss 22 and is located in the projection area of ​​the stopper 51 on the limiting boss 22. The sealing ring is embedded in the sealing groove. When the stopper 51 and the limiting boss 22 abut against each other in the first direction Z, the sealing ring embedded in the sealing groove forms a seal between the stopper 51 and the limiting boss 22.

[0058] In the above-mentioned preferred embodiment of using sealant to seal between the stop portion 51 and the pole 2, it is further preferred that the sealant has a first surface 61 facing away from the battery cell 3, the pole 2 has a second surface 23 facing away from the battery cell 3, the first surface 61 is close to the battery cell 3 relative to the second surface 23 or the first surface 61 is flush with the second surface 23, that is, the sealant does not protrude from the second surface 23 of the pole 2, which can ensure that the pole 2 can be better fitted and connected with external devices.

[0059] In the above preferred embodiment in which sealant is used to seal the stop portion 51 and the pole 2, it is further preferred that a sealant groove 213 is provided on the inner side wall of the through hole 21, such as Figure 6Schematically shown in the figure, a glue-containing groove 213 is provided on the inner side wall of the second hole portion 212. At least part of the sealant is contained in the glue-containing groove 213. It should be noted that the glue-containing groove 213 can be an annular groove extending continuously along the circumferential direction of the inner side wall of the through hole 21, and its number is not limited to one, and it can also be a plurality of grooves distributed at intervals along the first direction Z; the glue-containing groove 213 can also be a groove segment extending along the circumferential direction of the inner side wall of the through hole 21, and its number is also not limited to one, for example, it can include one or more groups of groove segments, and the plurality of groove segments in each group are distributed at intervals along the circumferential direction of the through hole 21, and the plurality of groups of groove segments are distributed at intervals along the first direction Z. The groove segments in adjacent groups can be arranged one by one or in an interlaced manner. Similarly, in other embodiments, the glue-containing groove 213 can also be provided on the outer side wall of the stop portion 51, and the arrangement of the glue-containing groove 213 on the outer side wall of the stop portion 51 can refer to the arrangement of the glue-containing groove 213 on the inner side wall of the through hole 21, which will not be repeated here. The above-mentioned design of the glue containing groove 213 can effectively increase the fitting area between the sealant and the pole 2 or the stop portion 51 during sealing, and at the same time, it can also form a corner after the sealant is formed, thereby effectively improving the sealing performance of the sealant. The radial cross-sectional shape of the glue containing groove 213 is not limited, and can be a polygon such as a triangle or a quadrilateral, or other shapes such as an arc. It should be noted that in a specific implementation, the glue containing groove 213 can be provided only on the inner wall of the through hole 21, or only on the outer wall of the stop portion 51, or the glue containing groove 213 can be provided on both the inner wall of the through hole 21 and the outer wall of the stop portion 51. The size L6 of the adhesive groove 213 in the second direction X (i.e., the groove depth) is preferably 0.5mm-2.0mm, and L6 can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, and 2.0mm, or a range between any two values. It should be noted that the size L2 of the stopper 51 and the size L6 of the adhesive groove 213 are only preferred solutions. In specific implementation, the specific sizes of the two can be matched and set according to design requirements. The size H7 of the adhesive groove 213 in the first direction Z is preferably 0.2 mm-1.0 mm, and H7 can be any one of 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1.0 mm, or a range between any two values. The distance H8 between the adhesive groove 213 closest to the limiting boss 22 and the limiting boss 22 in the first direction Z is preferably 0.20 mm-0.30 mm.H8 can be any value among 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.30mm, or a range between any two values.

[0060] In a further preferred embodiment, the first collecting plate 4 further includes a second protrusion 43, the main body 41, the second protrusion 43 and the first protrusion 42 are distributed along the first direction Z, the size of the second protrusion 43 in the second direction X is larger than the size of the first protrusion 42 in the second direction X, and the size of the second protrusion 43 in the second direction X is smaller than the size of the main body 41 in the second direction X, such as Figure 7 and Figure 8 or Fig.13 and Fig.14 As shown. With such a design, the strength of the first collector plate 4 can be increased by only partially increasing the thickness of the main body 41, which can save materials and reduce costs to a certain extent. It should be noted that the radial cross-sectional shape of the second protrusion 43 is not limited to a circle, and it can also be a square, hexagon or other polygon. The dimension H9 of the second protrusion 43 in the first direction Z is preferably 0.15mm-0.40mm. H9 can be any one of 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.40mm or the range between any two values. The dimension L7 of the second protrusion 43 in the second direction X is preferably 7mm-14mm. L7 can be any one of 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or the range between any two values.

[0061] In a further embodiment, the cylindrical battery further comprises a second current collecting plate 9 and a cover plate 10, such as Figure 2 , Figure 3 or Fig.11As shown. The second current collecting plate 9 is electrically connected to the battery cell 3. The other end of the shell 1 in the first direction Z is an open end 13, and the cover plate 10 is sealed at the open end 13. Preferably, the size of the cover plate 10 in the second direction X is larger than the size of the shell 1 at the open end 13 in the second direction X, and the cover plate 10 and the open end 13 of the shell 1 abut against each other. The cover plate 10 and the shell 1 are preferably welded and fixed by a sealing welding process to achieve the sealing of the open end 13 of the shell 1. The second current collecting plate 9 is arranged between the battery cell 3 and the cover plate 10, and the second current collecting plate 9 and the cover plate 10 are electrically connected. The second current collecting plate 9 and the cover plate 10 are preferably welded and fixed by penetration welding. An injection hole, not shown in the figure, may be provided on the cover plate 10 for injecting electrolyte into the shell 1. The injection hole is sealed by a sealing nail or other sealing member. Since this part of the content can be implemented by the existing technology and is not the focus of protection of this application, it will not be described in detail in this embodiment. In addition, it should be noted that in Figure 3 and Fig.11 In the preferred embodiment shown, the pole 2 is a positive pole of a cylindrical battery, the first current collecting plate 4 is also a positive current collecting plate, and the second current collecting plate 9 is also a negative current collecting plate.

[0062] Next, Figure 2 and Figure 3 The assembly process of the cylindrical battery in the embodiment shown is illustrated as an example:

[0063] S1, connect the first current collecting plate 4 and the positive electrode tab of the battery cell 3 by laser welding, and connect the second current collecting plate 9 and the negative electrode tab of the battery cell 3 by laser welding; assemble the pole 2, the insulating rubber ring 7 and the insulating gasket 8 to the housing 1;

[0064] S2, performing penetration welding on the second current collecting disc 9 and the cover plate 10. A continuous laser is used for penetration welding. After setting the parameters, the second current collecting disc 9 and the cover plate 10 are vertically aligned at the joint to achieve electrical connection on the negative electrode side.

[0065] S3, encapsulate the positive electrode side of the battery cell 3 with rubber, and assemble the welded battery cell 3 from the open end 13 of the shell 1 into the accommodating cavity 11 of the shell 1. When assembling, first assemble the first current collecting plate 4, and make the first protrusion 42 on the first current collecting plate 4 penetrate into the through hole 21 of the pole 2;

[0066] S4, placing the fastener 5 in the through hole 21, and rotating the fastener 5 so that the fixing portion 52 is thread-locked with the first protruding portion 42;

[0067] S5, placing the cylindrical battery with the fastener 5 fastened on the fixture of the shell opening peripheral welding process, selecting the continuous laser, and after setting the relevant parameters, tilting the laser head 70° to the joint between the cover plate 10 and the shell 1, and starting the continuous laser to perform deep melting welding and sealing on the joint between the shell 1 and the cover plate 10;

[0068] S6. Inject sealant into the through hole 21 for sealing. The height of the sealant is not higher than the second surface 23 of the pole 2 .

[0069] It should be noted that in the above steps, there are two situations regarding the close contact between the housing 1 and the cover plate 10:

[0070] The first method is to absorb the assembly tolerance between the first collector plate 4, the battery cell 3, the second collector plate 9 and the cover plate 10 by adjusting the thread engagement length between the fastener 5 and the first protrusion 42, so that the cover plate 10 can be closely fitted with the open end 13 of the shell 1 during assembly for subsequent welding. Specifically, since the size of the cover plate 10 in the second direction X is larger than the size of the opening at the open end 13 of the shell 1 in the second direction X, under the stop limit of the stop portion 51 by the limit boss 22 and the stop limit of the open end 13 of the shell 1 on the cover plate 10, the assembly tolerance between the first collector plate 4, the battery cell 3, the second collector plate 9 and the cover plate 10 is gradually absorbed in the process of gradually increasing the thread engagement length between the fastener 5 and the first protrusion 42, until the stop portion 51 is closely abutted with the limit boss 22 and the cover plate 10 is also closely abutted with the open end 13 of the shell 1. It should be noted that, in this case, the fastener 5 must be a conductive fastener, so that after fastening, the electrical connection between the pole 2 and the first current collecting plate 4 can be achieved by utilizing the close contact between the stop portion 51 and the limiting boss 22 .

[0071] The second method: during welding, the cover plate 10 is pressed against the open end 13 of the shell 1 by a clamping mechanism. In this case, the first collector plate 4 and the pole 2 can be fastened directly by a fastener 5. Specifically, under the stop limit of the stop portion 51 by the limit boss 22, in the process of rotating the fastener 5 to gradually increase the thread engagement length between it and the first protrusion 42, the main body 41 of the first collector plate 4 gradually approaches the pole 2 until the main body 41 of the first collector plate 4 is tightly abutted against the pole 2 or the second protrusion 43 of the first collector plate 4 in the other embodiments mentioned above is tightly abutted against the pole 2. The electrical connection between the first collector plate 4 and the pole 2 can be achieved by using the abutment surface between the two. In this case, the fastener 5 can be either a conductive fastener or a non-conductive fastener.

[0072] The above are only some implementation methods of the embodiments of the present application, and do not constitute any form of limitation on the application. The protection scope of the embodiments of the present application is not limited to this. Any simple modifications, equivalent changes and modifications that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.

Claims

1. A cylindrical battery, characterized in that: The cylindrical battery has a first direction (Z) and a second direction (X) arranged vertically, and the cylindrical battery comprises: A housing (1), the housing (1) having a containing cavity (11) and an opening (12) provided at one end in the first direction (Z); A pole (2), the pole (2) being insulated and connected to the housing (1) and covering the opening (12), the pole (2) being provided with a through hole (21), the through hole (21) penetrating the pole (2) along the first direction (Z) so as to be connected to the accommodation cavity (11) and the outside of the cylindrical battery respectively; A battery core (3), the battery core (3) being arranged in the accommodating cavity (11); a first current collecting disk (4), the first current collecting disk (4) being arranged in the accommodating cavity (11) and located on a side of the battery cell (3) facing the pole (2), the first current collecting disk (4) being electrically connected to the battery cell (3) and the pole (2) respectively; A fastener (5), wherein the fastener (5) is at least partially penetrated through the through hole (21) and is threadedly connected to the first collecting plate (4).

2. The cylindrical battery according to claim 1, characterized in that: The fastener (5) comprises a stop portion (51) and a fixing portion (52) connected to the stop portion (51), the stop portion (51) and the fixing portion (52) are distributed along the first direction (Z), and the size of the stop portion (51) in the second direction (X) is greater than the size of the fixing portion (52) in the second direction (X); The hole wall of the through hole (21) is provided with a limiting boss (22), and the limiting boss (22) is extended and protruded from the hole wall in the direction of the central axis of the through hole (21), the fixing portion (52) passes through the limiting boss (22) and is threadedly connected to the first collecting plate (4), and the stop portion (51) and the limiting boss (22) abut against each other in the first direction (Z).

3. The cylindrical battery according to claim 1, characterized in that: The first current collecting plate (4) comprises a main body (41) and a first protrusion (42); the main body (41) is electrically connected to the battery cell (3); the first protrusion (42) is arranged on one side of the main body (41) in the first direction (Z); the first protrusion (42) is inserted into the through hole (21) and is threadedly connected to the fastener (5).

4. The cylindrical battery according to claim 3, characterized in that: The outer side wall of the fastener (5) is provided with a first external thread structure (521), the end of the first protrusion (42) facing away from the main body (41) is provided with a first connecting hole (421), the inner side wall of the first connecting hole (421) is provided with a first internal thread structure (422) matching the first external thread structure (521), and the fastener (5) is inserted into the first connecting hole (421) and threadedly connected to the first collecting plate (4) through the cooperation of the first external thread structure (521) and the first internal thread structure (422); or The fastener (5) is provided with a second connection hole (522) at one end facing the battery cell (3); the inner wall of the second connection hole (522) is provided with a second internal thread structure (523); the outer wall of the first protrusion (42) is provided with a second external thread structure (423); the first protrusion (42) is inserted into the second connection hole (522) and is threadedly connected to the fastener (5) through the cooperation of the second external thread structure (423) and the second internal thread structure (523).

5. The cylindrical battery according to claim 2, characterized in that: The cylindrical battery further comprises a sealing member (6), and the stop portion (51) and the pole (2) are sealed by the sealing member (6).

6. The cylindrical battery according to claim 5, characterized in that: The sealing member (6) comprises a sealant, and the sealant is sealingly arranged in the through hole (21) and is located at the periphery of the stop portion (51).

7. The cylindrical battery according to claim 6, characterized in that: The sealant has a first surface (61) facing away from the battery cell (3), the pole (2) has a second surface (23) facing away from the battery cell (3), and the first surface (61) is close to the battery cell (3) relative to the second surface (23) or the first surface (61) is flush with the second surface (23).

8. The cylindrical battery according to claim 6, characterized in that: The inner side wall of the through hole (21) and / or the outer side wall of the stop portion (51) is provided with a glue containing groove (213), and at least a part of the sealant is contained in the glue containing groove (213).

9. The cylindrical battery according to claim 3, characterized in that: The first collecting plate (4) further comprises a second protrusion (43); the main body (41), the second protrusion (43) and the first protrusion (42) are distributed along the first direction (Z); the size of the second protrusion (43) in the second direction (X) is larger than the size of the first protrusion (42) in the second direction (X); and the size of the second protrusion (43) in the second direction (X) is smaller than the size of the main body (41) in the second direction (X).

10. The cylindrical battery according to claim 1, characterized in that: The fastener (5) is a conductive fastener.

11. A battery pack, characterized in that: Comprising a cylindrical battery as claimed in any one of claims 1 to 10.

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