Cylindrical battery and battery pack

Abstract

The cylindrical battery comprises a shell, a pole, a battery cell, a collector plate and sealant, an opening is formed in one end of the shell, the pole is in insulated connection with the shell and covers the opening, a through liquid injection hole is formed in the pole to communicate the interior of the shell with the exterior of the battery, the battery cell and the collector plate are arranged in the shell, and the sealant is arranged in the shell. The current collecting disc is electrically connected with the battery cell and is in threaded connection with the pole, a through hole opposite to the liquid injection hole is formed in the current collecting disc, and the sealant is arranged in the liquid injection hole in a sealing manner. The battery cell and the collector plate are in direct threaded connection, and the liquid injection hole is formed in the pole and sealed by the sealant, so that the product yield and reliability 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] In existing cylindrical batteries, the pole and the collector are generally welded and fixed by ultrasonic torque welding or other methods. The injection hole is set at the end of the shell and sealed with a sealing nail. If there is no good method for detecting cold welding, this design will easily cause many defective products to flow into the next process. In addition, particles are easily generated during welding. In addition, the space inside the battery shell is limited, and dust removal is difficult, which can easily cause damage to the battery cell or short circuit. In addition, when welding the sealing nail, if there is electrolyte residue around the injection hole or the electrolyte overflows into the welding gap between the sealing nail and the pole due to the heat generated by welding, it will also cause bubbles when welding the sealing nail, thereby affecting the welding quality and yield of the sealing nail. Utility Model Content

[0003] The purpose of this application is to provide a cylindrical battery and a battery pack to solve the technical problems of the risk of cold welding, the risk of cell damage or short circuit caused by particles generated, and the substandard sealing performance of the sealing nail when welding the pole and the collector plate and the sealing pin and the shell. 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 liquid injection hole, and the liquid injection hole penetrates the pole along a first direction to communicate with the accommodation 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, the first current collecting disk is electrically connected to the battery cell, the first current collecting disk is threadedly connected to the pole, and the first current collecting disk is provided with a through hole penetrating along a first direction, and the through hole is arranged opposite to the injection hole;

[0009] The sealant is sealed and arranged in the injection hole.

[0010] Optionally, the first current collecting plate includes a main body and a first protrusion, the first protrusion is arranged on one side of the main body in the first direction, the main body is electrically connected to the battery cell, the first protrusion is threadedly connected to the pole, and a through hole is arranged through the main body and the first protrusion.

[0011] Optionally, the outer wall of the first protrusion is provided with a first external thread structure, the hole wall of the injection hole is provided with a first internal thread structure matching the first external thread structure, the first protrusion is penetrated into the injection hole and is connected with the pole thread through the cooperation of the first external thread structure and the first internal thread structure.

[0012] Optionally, the pole includes a first part and a second part connected to the first part, the first part is arranged around the outer periphery of the injection hole, the second part is arranged around the outer periphery of the first part, the second part and the first part are spaced apart from each other to form an annular groove arranged around the outer periphery of the injection hole, and the first protrusion is embedded in the annular groove and is threadedly connected to the pole.

[0013] Optionally, the outer side wall of the first protrusion is provided with a second external thread structure, the inner side wall of the second part facing the first part is provided with a second internal thread structure matching the second external thread structure, and the first protrusion is threadably connected to the pole through the cooperation of the second external thread structure and the second internal thread structure.

[0014] Optionally, the hole wall of the through hole is provided with a third internal thread structure, the outer wall of the first part facing the second part is provided with a fourth internal thread structure matching the third internal thread structure, and the first protrusion is connected to the pole thread through the cooperation of the third internal thread structure and the fourth internal thread structure.

[0015] Optionally, the cylindrical battery further includes a sealing member, which is disposed in the liquid injection hole and is located on a side of the sealant facing the battery cell.

[0016] Optionally, a limiting boss is provided on the hole wall of the injection hole, and the limiting boss extends from the hole wall in the direction of the central axis of the injection hole. The sealing member is located on the side of the limiting boss away from the battery cell. The sealing member and the limiting boss abut against each other in a first direction, and the sealant seal is provided on the periphery of the sealing member.

[0017] Optionally, the through hole has an opening along the first direction that is set away from the battery cell, and the size of the opening in the second direction is smaller than the size of the injection hole in the second direction. The seal is located on the side of the first current collecting disk away from the battery cell and abuts against the first current collecting disk in the first direction, and the sealant seal is arranged on the periphery of the seal.

[0018] 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.

[0019] Optionally, a glue containing groove is provided on the inner side wall of the liquid injection hole, and at least a part of the sealant is contained in the glue containing groove.

[0020] 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.

[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 directly connects the current collecting plate to the pole thread. 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, which can effectively improve the product yield; the battery filling hole is set on the pole and is sealed with a sealant, which can improve the reliability of the battery sealing.

[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 It is 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 It is a schematic diagram of the three-dimensional structure of a current collecting plate provided in one embodiment of the present application;

[0032] Figure 8 It is a schematic diagram of a half-section structure of a current collecting plate provided in one embodiment of the present application;

[0033] Fig. 9is a schematic diagram of a half-section structure of a pole provided in another embodiment of the present application;

[0034] Fig.10 is a schematic diagram of a half-section structure of a current collecting plate provided in another embodiment of the present application;

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

[0036] Fig.12 It is a schematic diagram of a half-section structure of a current collecting plate provided in yet another embodiment of the present application.

[0037] Figure numerals: 1-shell, 11-accommodating cavity, 12-opening, 13-body, 131-open end, 132-closed end, 14-cover plate, 2-pole, 21-liquid injection hole, 211-first internal thread structure, 212-limiting boss, 213-glue containing groove, 22-annular groove, 221-second internal thread structure, 222-fourth internal thread structure, 23-second surface, 24-first part, 25-second part, 26 -The third part, 3-battery cell, 4-first current collecting plate, 41-main body, 42-first protrusion, 421-first external thread structure, 422-second external thread structure, 43-through hole, 431-third internal thread structure, 432-opening, 44-second protrusion, 5-sealant, 51-first surface, 6-seal, 7-insulating rubber ring, 8-insulating gasket, 9-second current collecting plate, Z-first direction, X-second direction. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The cylindrical battery includes a shell 1, a pole 2, a battery cell 3, a first current collecting plate 4 and a sealant 5. Figures 1 to 12 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.

[0042] 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 .

[0043] 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 riveted and fixed to the end of the housing 1 by a riveting process. 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 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 liquid injection hole 21, which penetrates the pole 2 along a first direction, such as Figure 5 and 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.

[0044] The first current collecting disc 4 and the battery cell 3 are both arranged in the accommodating cavity 11. 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.

[0045] The first current collecting plate 4 is threadedly connected to the pole 2. The first current collecting plate 4 is provided with a through hole 43 penetrating along the first direction Z, and the through hole 43 is arranged opposite to the injection hole 21. The sealant 5 is sealed in the injection hole 21.

[0046] The cylindrical battery of the present application directly connects the first current collecting plate 4 to the pole 2 by threading. 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, which can effectively improve the product yield; and the injection hole 21 is arranged on the pole 2 and is sealed by the sealant 5, which can improve the reliability of the battery sealing.

[0047] Reference Figures 3 to 8 , which schematically shows a preferred embodiment, the first collecting plate 4 includes a main body 41 and a first protrusion 42. The size H of the main body 41 in the first direction Z is 1 Preferably 0.3mm. The first protrusion 42 is arranged on one side of the main body 41 in the first direction Z, and the main body 41 is electrically connected to the battery cell 3. The through hole 43 is arranged through the main body 41 and the first protrusion 42. The outer wall of the first protrusion 42 is provided with a first external thread structure 421, and the hole wall of the injection hole 21 is provided with a first internal thread structure 211 matching the first external thread structure 421. The first protrusion 42 is penetrated in the injection hole 21 and is threadedly connected to the pole 2 through the cooperation of the first external thread structure 421 and the first internal thread structure 211. In this embodiment, the dimension H of the pole 2 in the first direction Z is 2 Preferably, it is 1.5 mm to 5.0 mm. 2 The size L of the injection hole 21 in the second direction X 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, and 5.0mm, or a range between any two of the values. 1 Preferably 4mm-7mm. 1 The dimension H of the first protrusion 42 in the first direction Z can be any one of 4 mm, 5 mm, 6 mm, and 7 mm, or a range between any two of the values. 3 Preferably, it is 1.5 mm to 5.0 mm. 3The size of the first protrusion 42 in the second direction X is equal to the size L of the injection hole 21 in the second direction X. 1 Match.

[0048] Reference Fig. 9 and Fig.10 , which schematically shows another preferred embodiment. The pole 2 includes a first part 24, a second part 25 and a third part 26. The first part 24 is arranged around the outer periphery of the injection hole 21, the second part 25 is arranged around the outer periphery of the first part 24, the second part 25 and the first part 24 are spaced apart from each other and connected through the third part 26 to form an annular groove 22 arranged around the outer periphery of the injection hole 21. The first protrusion 42 is embedded in the annular groove 22 and is threadedly connected to the pole 2. Specifically, the outer side wall of the first protrusion 42 is provided with a second external thread structure 422, and the inner side wall of the second part 25 facing the first part 24 is provided with a second internal thread structure 221 matching the second external thread structure 422, and the first protrusion 42 is threadedly connected to the pole 2 through the cooperation of the second external thread structure 422 and the second internal thread structure 221. In other embodiments, a third internal thread structure 431 may be provided on the hole wall of the through hole 43, and a fourth internal thread structure 222 matching the third internal thread structure 431 may be provided on the outer wall of the first portion 24 facing the second portion 25, and the first protrusion 42 may be threadedly connected to the pole 2 through the third internal thread structure 431 and the fourth internal thread structure 222. Fig.11 and Fig.12 shown.

[0049] In a preferred embodiment, the cylindrical battery further includes a sealing member 6 , which is disposed in the injection hole 21 , and is located on a side of the sealant 5 facing the battery cell 3 . Figure 3 and Figure 4 A preferred solution is schematically shown in FIG. 1 , in which a limiting boss 212 is provided on the wall of the injection hole 21, and the limiting boss 212 extends from the wall toward the direction of the central axis of the injection hole 21, thereby forming a through hole in the middle of the limiting boss 212. The dimension H of the limiting boss 212 in the first direction Z is 4Preferably, it is 0.2mm-0.5mm. 4 The extension dimension L of the limiting boss 212 in the second direction X can be any one of 0.2 mm, 0.3 mm, 0.4 mm, and 0.5 mm, or a range between any two of the values. 2 The distance H between the limiting boss 212 and the end side of the pole 2 facing the battery cell 3 in the first direction Z is preferably 2 mm. 5 Preferably, it is 1.5 mm to 5.0 mm. 5 It can be any value among 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 the range between any two values. It should be noted that the size H of the pole 2 mentioned above is 2 The size and the distance H between the limiting boss 212 and the end side of the pole 2 5 The size is only a preferred solution. During the specific implementation, the specific sizes of the two can be matched and set according to the design requirements. The seal 6 is in the form of a sheet. The seal 6 is located on the side of the limiting boss 212 away from the battery cell 3 and abuts against the limiting boss 212 in the first direction Z to limit the movement of the seal 6 toward the battery cell 3. At the same time, the seal 6 blocks the through hole in the middle of the limiting boss 212. In a preferred embodiment, the seal 6 can be first welded and fixed to the limiting boss 212, and then sealed on the periphery of the seal 6 with a sealant 5, thereby achieving a double sealing effect. Of course, in other embodiments, the seal 6 and the limiting boss 212 may not be fixed, or other fixing methods may be used, such as locking and fixing with fasteners such as screws. In addition, in other embodiments, the structure of the seal 6 is not limited to a sheet shape, and it can also be other shapes, such as a nail shape, where the nail is inserted into the through hole in the middle of the limiting boss 212, and the nail cap is located on the side of the limiting boss 212 away from the battery cell 3 and abuts against the limiting boss 212 in the first direction Z.

[0050] In another embodiment, the seal 6 may also be directly in contact with the first current collecting plate 4 in the first direction Z. Specifically, the through hole 43 has an orifice 432 disposed away from the battery cell 3 along the first direction Z, and the size of the orifice 432 in the second direction X is smaller than the size of the injection hole 21 in the second direction X. The seal 6 is located on the side of the first current collecting plate 4 away from the battery cell 3, and is in contact with the first current collecting plate 4 in the first direction Z to limit the movement of the seal 6 toward the battery cell 3, while the seal 6 blocks the orifice 432. In a preferred embodiment, the seal 6 may be first welded and fixed to the first current collecting plate 4, and then sealed to the periphery of the seal 6 with a sealant 5, thereby achieving a double sealing effect. Of course, in other embodiments, the seal 6 may not be fixed to the first current collecting plate 4, or other fixing methods may be used, such as locking and fixing with fasteners such as screws. In addition, in other embodiments, the structure of the seal 6 is not limited to a sheet shape, and it can also be other shapes, such as a nail shape, where the nail body passes through the through hole 43 from the hole 432, and the nail cap is located on the side of the first current collecting disk 4 away from the battery cell 3 and abuts against the first current collecting disk 4 in the first direction Z.

[0051] In a further preferred embodiment, the sealant 5 has a first surface 51 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 51 is close to the battery cell 3 relative to the second surface 23 or the first surface 51 is flush with the second surface 23, that is, the sealant 5 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.

[0052] In a further preferred embodiment, a glue containing groove 213 is provided on the inner side wall of the injection hole 21, such as Figure 6As schematically shown in the figure, a glue containing groove 213 is provided on the inner wall of the injection hole 21 on the side of the limiting boss 212 away from the battery cell 3. At least part of the sealant 5 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 circumference of the inner wall of the injection 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 wall of the injection 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 multiple groove segments in each group are distributed at intervals along the circumferential direction of the injection hole 21, and the multiple 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 staggered. By providing the glue groove 213 on the inner wall of the injection hole 21, the fitting area between the sealant 5 and the pole 2 can be effectively increased when the sealant 5 is sealed, and a corner can be formed after the sealant 5 is formed, thereby effectively improving the sealing performance of the sealant 5. The radial cross-sectional shape of the glue groove 213 is not limited, and can be a polygon such as a triangle or a quadrilateral, or other shapes such as an arc. The size (i.e., the groove depth) L of the glue groove 213 in the second direction X is 3 Preferably 0.5mm-2.0mm, L 3 It can be any value among 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, 2.0mm, or a range between any two values. The dimension H of the adhesive containing groove 213 in the first direction Z is 6 Preferably 0.2mm-1.0mm, H 6 The distance H between the adhesive groove 213 closest to the limiting boss 212 and the limiting boss 212 in the first direction Z is 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 any two of the values. 7 Preferably, it is 0.20 mm to 0.30 mm. 7 It 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.

[0053] In a further preferred embodiment, the first collecting plate 4 further includes a second protrusion 44, the main body 41, the second protrusion 44 and the first protrusion 42 are distributed along the first direction Z, the size of the second protrusion 44 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 44 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.10 or Fig.12 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 44 is not limited to a circle, and it can also be a square, hexagon or other polygon. The size H of the second protrusion 44 in the first direction Z is 8 Preferably, it is 0.15mm-0.40mm. 8 The dimension L of the second protrusion 44 in the second direction X can be any one of 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, 0.30 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, and 0.40 mm, or a range between any two of the values. 4 Preferably 7mm-14mm. 4 It can be any value of 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or a range between any two values.

[0054] In a further embodiment, the cylindrical battery further includes a second current collecting plate 9. The second current collecting plate 9 is disposed in the accommodating cavity 11 surrounded by the shell 1, and the second current collecting plate 9 is electrically connected to the battery cell 3 and the shell 1 respectively. Figure 2 or Figure 3In the preferred embodiment shown, the shell 1 shown includes a main body 13 and a cover plate 14, wherein one end of the main body 13 in the first direction Z is an open end 131, and the other end is a closed end 132, and the cover plate 14 is sealed at the open end 131. Preferably, the size of the cover plate 14 in the second direction X is larger than the size of the opening in the second direction X at the open end 131, and the cover plate 14 and the open end 131 abut against each other. The cover plate 14 and the main body 13 are preferably welded and fixed by a sealing welding process to achieve the sealing of the open end 131. The second current collecting plate 9 is arranged between the battery cell 3 and the end wall of the closed end 132, and the second current collecting plate 9 is electrically connected to the end wall of the closed end 132. The second current collecting plate 9 and the end wall of the closed end 132 are preferably welded and fixed by penetration welding. It should be noted that in Figure 3 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.

[0055] Next, Figure 2 and Figure 3 The assembly process of the cylindrical battery in the embodiment shown is illustrated as an example:

[0056] 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 onto the cover plate 14;

[0057] S2, encapsulate the positive electrode side of the battery cell 3 with glue, and assemble the welded battery cell 3 into the body 13 from the open end 131 of the body 13, assembling the second current collecting plate 9 first;

[0058] S3, placing the body 13 equipped with the battery cell 3 on the fixture of the negative electrode penetration welding process, and pressing it with a pressing mechanism to make the second current collecting disc 9 and the end wall of the closed end 132 fit together without a gap, then selecting a continuous laser, setting the parameters and vertically aligning the second current collecting disc 9 and the end wall of the closed end 132 to weld to achieve electrical connection on the negative electrode side;

[0059] S4, put the intermediate product completed after step S3 on the cover plate shell clamp, and screw the cover plate 14 to lock the pole 2 and the first current collecting disc 4; in this step, the assembly tolerance between the first current collecting disc 4, the battery cell 3, the second current collecting disc 9 and the end wall of the closed end 132 of the body 13 can be absorbed by adjusting the thread engagement length between the pole 2 and the first current collecting disc 4, so that during assembly, the cover plate 14 can fit tightly with the open end 131 of the body 13 to facilitate subsequent welding. Specifically, since the size of the cover plate 14 in the second direction X is larger than the size of the opening at the open end 131 in the second direction X, the assembly tolerance between the first current collecting disc 4, the battery cell 3, the second current collecting disc 9 and the end wall of the closed end 132 of the body 13 is gradually absorbed in the process of screwing the cover plate 14 to drive the pole 2 to rotate and gradually increase the thread engagement length between the pole 2 and the first current collecting disc 4, until the cover plate 14 is also tightly abutted against the open end 131 of the body 13;

[0060] S5. Place the fastened cylindrical battery on the fixture of the cover plate sealing welding process, select the continuous laser, and after setting the relevant parameters, tilt the laser head 70° to the joint between the cover plate 14 and the body 13, and start the continuous laser to perform deep melting welding and sealing on the joint between the body 13 and the cover plate 14;

[0061] S6, injecting electrolyte into the housing 1 through the injection hole 21, then assembling the sealing member 6 into the injection hole 21, and welding and fixing the sealing member 6 to the limiting boss 212;

[0062] S7 . Inject sealant 5 into the injection hole 21 for sealing. The height of the sealant 5 is not higher than the second surface 23 of the pole 2 .

[0063] The above description is only a partial implementation method of the embodiments of the present application and does not constitute any form of limitation on the application. The protection scope of the embodiments of the present application is not limited thereto. 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 liquid injection hole (21), the liquid injection hole (21) penetrating the pole (2) along the first direction (Z) so as to be connected to the accommodating 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 being 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), the first current collecting disk (4) being threadedly connected to the pole (2), the first current collecting disk (4) being provided with a through hole (43) penetrating along the first direction (Z), the through hole (43) being arranged opposite to the injection hole (21); A sealant (5), wherein the sealant (5) is sealingly disposed in the liquid injection hole (21).

2. 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 first protrusion (42) is arranged on one side of the main body (41) in the first direction (Z); the main body (41) is electrically connected to the battery cell (3); the first protrusion (42) is threadedly connected to the pole (2); and the through hole (43) is arranged to pass through the main body (41) and the first protrusion (42).

3. The cylindrical battery according to claim 2, characterized in that: The outer wall of the first protrusion (42) is provided with a first external thread structure (421), the hole wall of the injection hole (21) is provided with a first internal thread structure (211) matching the first external thread structure (421), and the first protrusion (42) is inserted into the injection hole (21) and is threadably connected to the pole (2) through the cooperation of the first external thread structure (421) and the first internal thread structure (211).

4. The cylindrical battery according to claim 2, characterized in that: The pole (2) comprises a first portion (24) and a second portion (25) connected to the first portion (24); the first portion (24) is arranged around the outer periphery of the injection hole (21); the second portion (25) is arranged around the outer periphery of the first portion (24); the second portion (25) and the first portion (24) are spaced from each other to form an annular groove (22) arranged around the outer periphery of the injection hole (21); the first protrusion (42) is embedded in the annular groove (22) and is threadedly connected to the pole (2).

5. The cylindrical battery according to claim 4, characterized in that: The outer side wall of the first protruding portion (42) is provided with a second external thread structure (422), and the inner side wall of the second portion (25) facing the first portion (24) is provided with a second internal thread structure (221) matching the second external thread structure (422), and the first protruding portion (42) is threadedly connected to the pole (2) through the cooperation of the second external thread structure (422) and the second internal thread structure (221).

6. The cylindrical battery according to claim 4, characterized in that: The hole wall of the through hole (43) is provided with a third internal thread structure (431), the outer side wall of the first part (24) facing the second part (25) is provided with a fourth internal thread structure (222) matching the third internal thread structure (431), and the first protrusion (42) is threadedly connected to the pole (2) through the cooperation of the third internal thread structure (431) and the fourth internal thread structure (222).

7. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further comprises a sealing member (6), wherein the sealing member (6) is arranged in the liquid injection hole (21), and the sealing member (6) is located on a side of the sealant (5) facing the battery core (3).

8. The cylindrical battery according to claim 7, characterized in that: The hole wall of the injection hole (21) is provided with a limiting boss (212), and the limiting boss (212) is extended and protruded from the hole wall in the direction of the central axis of the injection hole (21), and the sealing member (6) is located on the side of the limiting boss (212) away from the battery cell (3), and the sealing member (6) and the limiting boss (212) are in contact with each other in the first direction (Z), and the sealant (5) is sealingly arranged on the periphery of the sealing member (6).

9. The cylindrical battery according to claim 7, characterized in that: The through hole (43) has an orifice (432) arranged away from the battery core (3) along the first direction (Z); the size of the orifice (432) in the second direction (X) is smaller than the size of the injection hole (21) in the second direction (X); the sealing member (6) is located on a side of the first current collecting plate (4) away from the battery core (3) and abuts against the first current collecting plate (4) in the first direction (Z); and the sealant (5) is sealingly arranged on the periphery of the sealing member (6).

10. The cylindrical battery according to claim 1, characterized in that: The sealant (5) has a first surface (51) 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 (51) is close to the battery cell (3) relative to the second surface (23) or the first surface (51) is flush with the second surface (23).

11. The cylindrical battery according to claim 1, characterized in that: The inner side wall of the liquid injection hole (21) is provided with a glue containing groove (213), and at least a part of the sealant (5) is contained in the glue containing groove (213).

12. The cylindrical battery according to claim 2, characterized in that: The first collecting plate (4) further comprises a second protrusion (44); the main body (41), the second protrusion (44) and the first protrusion (42) are distributed along the first direction (Z); the size of the second protrusion (44) 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 (44) in the second direction (X) is smaller than the size of the main body (41) in the second direction (X).

13. A battery pack, characterized in that: Comprising a cylindrical battery as described in any one of claims 1-12.

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