Riveting top cover anti-rotation structure of cylindrical battery and cylindrical battery

Abstract

The utility model provides a riveting top cover anti-rotation structure of a cylindrical battery and the cylindrical battery, and belongs to the technical field of batteries. The riveting top cover anti-rotation structure of the cylindrical battery comprises a riveting block, an upper insulating plastic plate, a top cover, a ceramic limiting piece, a lower insulating plastic plate and a pole, at least three first limiting grooves are formed in the lower surface of the riveting block; limiting through holes are formed in the positions, corresponding to the first limiting grooves, of the upper insulating plastic plate. A second limiting groove is formed in the position, corresponding to the limiting through hole, of the top cover; the ceramic limiting pieces are arranged in limiting cavities formed by the corresponding first limiting grooves, the limiting through holes and the second limiting grooves in a matched mode. According to the utility model, the riveting block and the top cover are occluded to prevent rotation through the ceramic limiting pieces, and meanwhile, the plurality of ceramic limiting pieces form circumferential plane support between the riveting block and the top cover to support / prevent the riveting block from inclining, so that short circuit caused by lap joint of the riveting block and the top cover is avoided, and safety risks such as fire and explosion caused by secondary short circuit of the battery are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to riveting top cover anti -rotation structure of cylindrical battery and cylindrical power battery. BACKGROUND

[0002] At present, lithium ion / sodium ion cylindrical battery gradually becomes new energy industry mainstream product because of high energy density, capacity consistency is good, can support big times of charging and discharging and so on advantage. More and more battery manufacturers select riveting top cover structure to realize cost reduction and improve capacity, but there are the following problems in the process of manufacturing or using:

[0003] 1, the riveting top cover structure of the existing cylindrical battery, the cylindrical pole is riveted on the top cover, if the anti -rotation limit is insufficient, when the long -term vibration / twist or drum test of loading, busbar drives pole / connecting sheet rotation, will directly impact the stability of battery structure, causes riveting top cover structure (riveting stability, sealing ring wear etc.) to be destroyed, causes top cover leakage, cannot normally charge and discharge overcurrent etc. Problem, influence battery service life;

[0004] 2, when the cylindrical battery high temperature abnormality occurs and the insulating plastic melts, or the riveting block is distorted when loading, the pole and the shell cover lap can cause the battery secondary short circuit and fire explosion etc. Safety risk, brings hidden danger to personal safety. INVENTION CONTENTS

[0005] The utility model discloses a riveting top cover anti -rotation structure of cylindrical battery and cylindrical battery to solve the problems in the prior art, through the first limit recess, limit through -hole and second limit recess that cooperate are set up between riveting block, upper insulating plastic plate and top cover and form limit cavity, and the ceramic limit piece that cooperates is set up in limit cavity, riveting block and top cover are prevented from rotating between occlusion, and multiple ceramic limit pieces form circumferential plane support between riveting block and top cover, support / prevent riveting block from skewing, avoid riveting block and top cover lap short circuit, avoid the safety risk that battery secondary short circuit brings, fire explosion etc. Safety risk.

[0006] The utility model discloses the technical scheme that adopts is:

[0007] A riveting top cover anti -rotation structure of cylindrical battery, comprising:

[0008] Riveting block, the central region of riveting block is seted up with first through -hole;The lower surface of riveting block is seted up with at least three first limit recess, and the first through -hole is located in the region surrounded by multiple first limit recesses;

[0009] An upper insulating plastic plate, a center region of the upper insulating plastic plate is provided with a second through hole; the upper insulating plastic plate is located below the riveting block, and a limiting through hole is provided at a corresponding position of the first limiting groove;

[0010] A top cover, a center region of the top cover is provided with a third through hole; the top cover is located below the upper insulating plastic plate, and a second limiting groove is provided at a corresponding position of the limiting through hole;

[0011] A ceramic limiting piece, the ceramic limiting piece is arranged in a limiting cavity formed by the first limiting groove, the limiting through hole and the second limiting groove in cooperation;

[0012] A lower insulating plastic plate, a center region of the lower insulating plastic plate is provided with a fourth through hole; an inner diameter of the fourth through hole, the third through hole and the second through hole is greater than an inner diameter of the first through hole; the lower insulating plastic plate is located below the top cover;

[0013] An inverted T-shaped pole, a vertical part of the pole is a coaxial column-shaped upper segment and a column-shaped lower segment; a diameter of the column-shaped upper segment is smaller than a diameter of the column-shaped lower segment and is close to the inner diameter of the first through hole; a horizontal part of the pole abuts against a lower surface of the lower insulating plastic plate; the column-shaped lower segment is arranged in a combined cavity of the second through hole, the third through hole and the fourth through hole and is sleeved with a matched sealing piece; the column-shaped upper segment is arranged in the first through hole in cooperation, and a top edge thereof is connected with an upper end opening edge of the first through hole, so that the riveting block and the pole clamp the upper insulating plastic plate, the top cover and the lower insulating plastic plate in cooperation.

[0014] Further, the first limiting grooves are uniformly distributed in a circumferential manner.

[0015] Further, an upper positioning protrusion is arranged at an upper surface edge of the upper insulating plastic plate; an inner side dimension of the upper positioning protrusion is close to an outer circumferential dimension of the riveting block.

[0016] Further, a lower end opening edge of the second through hole is downwardly protruded in a cylindrical shape to form a first lower positioning protrusion; an inner diameter of the first lower positioning protrusion is close to an inner diameter of the second through hole, and an outer diameter thereof is close to an inner diameter of the third through hole; an axial length of the first lower positioning protrusion is less than or equal to a depth of the third through hole.

[0017] Further, a positioning groove is provided at a center position of an upper surface of the top cover; an inner side dimension of the positioning groove is close to an outer circumferential dimension of the upper insulating plastic plate; the third through hole and the second limiting groove are located on a groove bottom of the positioning groove.

[0018] Further, a first limiting protrusion and a third limiting groove are arranged in cooperation between the top cover and the lower insulating plastic plate.

[0019] Further, a second lower positioning protrusion coaxial with the fourth through hole is formed on the lower surface of the lower insulating plastic plate, and the inner diameter of the second lower positioning protrusion is close to the diameter of the circular horizontal part of the pole.

[0020] Further, a U-shaped fifth limiting groove is arranged on the edge of the horizontal part of the pole, and a second limiting protrusion is arranged on the inner side wall of the ring of the second lower positioning protrusion at a position corresponding to the fifth limiting groove.

[0021] Based on the same inventive concept, the utility model also provides a cylindrical battery comprising the riveting top cover anti-rotation structure of the cylindrical battery.

[0022] The utility model has the advantages of:

[0023] In the utility model, the first limiting groove, the limiting through hole and the second limiting groove are arranged in cooperation between the riveting block, the upper insulating plastic plate and the top cover to form a limiting cavity, and the ceramic limiting pieces are arranged in cooperation in the limiting cavity, so that the riveting block and the top cover are engaged and prevented from rotating, and the plurality of ceramic limiting pieces form circumferential plane support between the riveting block and the top cover. When the busbar brings rotational impact to the pole during loading, vibration or roller testing, the upper insulating plastic plate and the top cover are stressed and limited under the engagement of the first limiting groove, the limiting through hole, the second limiting groove and the ceramic limiting pieces, the service life of the battery is improved; when the battery abnormally generates high temperature, the ceramic limiting pieces support / stop the riveting block from being skewed, the riveting block and the top cover are prevented from being overlapped and short-circuited, the safety risks such as secondary short circuit of the battery, fire and explosion are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 It is a front view of the riveting top cover anti-rotation structure of the embodiment cylindrical battery.

[0026] Figure 2 It is Figure 1 It is a sectional view along A-A direction in the embodiment.

[0027] Figure 3A three-dimensional structure diagram of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment.

[0028] Figure 4 An exploded structure diagram of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment.

[0029] Figure 5 An exploded structure diagram of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment from another perspective.

[0030] The reference signs are:

[0031] 100-riveting block, 200-upper insulating plastic plate, 300-top cover, 400-lower insulating plastic plate, 500-sealing element, 600-pole, 700-ceramic limiting element.

[0032] 110-first through hole, 120-first limiting groove.

[0033] 210-second through hole, 220-upper positioning protrusion, 230-first lower positioning protrusion, 240-limiting through hole.

[0034] 310-positioning groove, 320-third through hole, 330-second limiting groove, 340-third limiting groove.

[0035] 410-fourth through hole, 420-first limiting protrusion, 430-second lower positioning protrusion, 440-second limiting protrusion.

[0036] 610-cylindrical upper section, 620-cylindrical lower section, 630-fifth limiting groove. DETAILED DESCRIPTION

[0037] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0039] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0040] Figure 1 The front view of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment. Figure 2 As shown in Figure 1 The middle A-A sectional view. Figure 3 The three-dimensional structure schematic view of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment. Figure 4 The exploded structure schematic view of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment. Figure 5 The exploded structure schematic view of the riveting top cover anti-rotation structure of the cylindrical battery in the embodiment from another perspective. Figures 1 to 5 As shown in the embodiment, the riveting top cover anti-rotation structure of the cylindrical battery comprises a circular riveting block 100, a circular upper insulating plastic plate 200, a circular top cover 300, a circular lower insulating plastic plate 400, a high hat-shaped sealing element 500 and a pole 600. From top to bottom, the riveting block 100, the upper insulating plastic plate 200, the top cover 300 and the lower insulating plastic plate 400 are stacked in sequence to form a combination; the sealing element 500 is sleeved on the pole 600 and then passes through the combination, and the top end edge of the pole 600 is laser welded to the riveting block 100 after riveting.

[0041] The following will describe in detail each component constituting the riveting top cover anti-rotation structure of the cylindrical battery.

[0042] As shown in Figures 1 to 5 The pole 600 is roughly inverted T-shaped and is made of metal materials such as copper and aluminum; the vertical part of the pole 600 is a coaxial cylindrical upper segment 610 and a cylindrical lower segment 620; the diameter of the cylindrical upper segment 610 is smaller than that of the cylindrical lower segment 620; the horizontal part of the pole 600 is circular, and opposite two side edges thereof are provided with a U-shaped fifth limiting groove 630.

[0043] As shown in Figures 1 to 5As shown in the figure, the circular riveting block 100 is made of metal material such as copper or aluminum, and a first through hole 110 is formed in the center area along the thickness direction thereof, which can be used for the insertion of the cylindrical upper section 610 of the pole 600. After the cylindrical upper section 610 is inserted into the first through hole 110, the top end surface of the pole 600 is substantially flush with the surface where the upper end opening of the first through hole 110 is located, and the top end edge of the pole 600 is connected to the upper end opening edge of the first through hole 110 by laser welding to form an integral whole. Three circular first limiting grooves 120 are uniformly formed on the lower surface of the riveting block 100 (i.e. the surface facing the upper insulating plastic plate 200) in a circumferential manner. In this embodiment, the first limiting grooves 120 can also be formed in a non-circumferential manner according to requirements and processing difficulty, and the number of the first limiting grooves 120 can also be more than three, as long as the surrounding area of the plurality of first limiting grooves 120 can contain the first through hole 110.

[0044] As shown in the figure, Figures 1 to 5 As shown in the figure, the circular upper insulating plastic plate 200 is made of insulating resin material such as PP or PET, and a second through hole 210 is formed in the center area along the thickness direction thereof, and the inner diameter of the second through hole 210 is larger than the diameter of the first through hole 110. The edge of the upper surface of the upper insulating plastic plate 200 is protruded upward in a cylindrical shape to form an upper positioning protrusion 220, the inner diameter of the upper limiting protrusion 220 is similar to the diameter of the riveting block 100, and the outer diameter of the upper limiting protrusion 220 is similar to the diameter of the upper insulating plastic plate 200. The lower end opening edge of the second through hole 210 is protruded downward in a cylindrical shape to form a first lower positioning protrusion 230, and the inner diameter of the first lower positioning protrusion 230 is similar to the inner diameter of the second through hole 210. Limiting through holes 240 are formed in the upper insulating plastic plate 200 at positions corresponding to the first limiting grooves 120. When the upper insulating plastic plate 200 is combined with the riveting block 100, the riveting block 100 is placed flat inside the upper positioning protrusion 220, and the lower surface of the riveting block 100 is in contact with the upper surface of the upper insulating plastic plate 200. After the vertical part of the pole 600 is inserted into the first through hole 110, the second through hole 210 and the first lower positioning protrusion 230, the top end surface of the pole 600 is substantially flush with the surface where the upper end opening of the first through hole 110 is located, and the top end edge of the pole 600 is connected to the upper end opening edge of the first through hole 110 by laser welding to form an integral whole. The side wall of the cylindrical upper section 610 is in contact with the side of the first through hole 110, the upper side wall of the cylindrical lower section 620 is in contact with the side wall of the second through hole 210 and the inner side wall of the first lower positioning protrusion 230, and the first limiting grooves 120 correspond to the limiting through holes 240.

[0045] As shown in the figure, Figures 1 to 5As shown in the figure, the circular top cover 300 is made of metal material such as aluminum, and a circular positioning groove 310 is formed in the center area of the top cover 300. The inner diameter of the positioning groove 310 is close to the diameter of the upper insulating plastic plate 200. A third through hole 320 is formed in the center area of the groove bottom of the positioning groove 310 along the thickness direction of the groove bottom. The inner diameter of the third through hole 320 is close to the outer diameter of the first lower positioning protrusion 230, and the depth (the size in the through direction) of the third through hole 320 is greater than the axial length of the first lower positioning protrusion 230. Second limiting grooves 330 are respectively formed in the groove bottom of the positioning groove 310 at positions corresponding to the limiting through holes 240. A circular third limiting groove 340 is formed on each of the two sides of the lower surface of the top cover 300. When the top cover 300 is combined with the upper insulating plastic plate 200, the upper insulating plastic plate 200 is placed in the positioning groove 310, and the outer side wall of the first lower positioning protrusion 230 is in contact with the side wall of the third through hole 320. The first limiting groove 120, the corresponding limiting through hole 240 and the second limiting groove 330 form a limiting cavity, and a matched ceramic limiting piece 700 is arranged in the limiting cavity. The ceramic limiting piece 700 is made of inorganic insulating material such as aluminum oxide. The vertical part of the pole 600 is matched and inserted into the first through hole 110, the second through hole 210 and the first lower positioning protrusion 230. The top end surface of the pole 600 is substantially flush with the surface on which the upper end opening of the first through hole 110 is located. After riveting, the top end edge of the pole 600 is connected to the edge of the upper end opening of the first through hole 110 as a whole by laser welding. The side wall of the cylindrical upper section 610 is in contact with the side of the first through hole 110, and the upper side wall of the cylindrical lower section 620 is in contact with the side wall of the second through hole 210 and the inner side wall of the first lower positioning protrusion 230. In this embodiment, the first limiting groove, the limiting through hole and the second limiting groove form a limiting cavity by being arranged between the riveting block, the upper insulating plastic plate and the top cover, and the matched ceramic limiting piece is arranged in the limiting cavity. The riveting block and the top cover are clamped to prevent rotation, and the plurality of ceramic limiting pieces form circumferential plane support between the riveting block and the top cover. When the busbar brings rotational impact to the pole during loading, vibration or roller testing, the upper insulating plastic plate and the top cover are stressed and limited under the clamping of the first limiting groove, the limiting through hole, the second limiting groove and the ceramic limiting piece, thereby improving the service life of the battery. When the battery abnormally generates high temperature and the insulating plastic melts or is impacted by external force, the ceramic limiting piece supports / prevents the riveting block from being skewed, thereby avoiding the riveting block and the top cover from being short-circuited, avoiding the safety risks such as secondary short circuit of the battery, fire and explosion.

[0046] As Figures 1 to 5As shown, the circular lower insulating plastic plate 400 is made of insulating resin materials such as PP and PET. A fourth through hole 410 is formed in its central area along its thickness direction. The inner diameter of the fourth through hole 410 is larger than the inner diameter of the third through hole 320. The upper surface of the lower insulating plastic plate 400 is formed with a first limiting protrusion 420 corresponding to the third limiting groove 340. The lower surface of the lower insulating plastic plate 400 is formed with a second lower positioning protrusion 430 coaxial with the fourth through hole 410. The inner diameter of the second lower positioning protrusion 430 is similar to the diameter of the horizontal part of the pole post 600. A second limiting protrusion 440 is provided on the inner side wall of the second lower positioning protrusion 430 at a position corresponding to the fifth limiting groove 630. When the lower insulating plastic sheet 400 is assembled with the top cover 300, the first limiting protrusion 420 is inserted into the third limiting groove 340; the horizontal part of the pole post 600 is inserted into the second lower positioning protrusion 430, and the second limiting protrusion 440 is engaged with the fifth limiting groove 630; after the vertical part of the pole post 600 is inserted into the first through hole 110, the second through hole 210 and the first lower positioning protrusion 230, the top end face of the pole post 600 is approximately flush with the surface where the upper opening of the first through hole 110 is located, and after riveting... The top edge of the pole post 600 is laser-welded to the upper opening edge of the first through hole 110 to form a whole; the side wall of the upper cylindrical section 610 contacts the side of the first through hole 110, and the upper side wall of the lower cylindrical section 620 contacts the side wall of the second through hole 210 and the inner side wall of the first lower positioning protrusion 230; the lower cylindrical section 620, the first lower positioning protrusion 230, the top cover 300, the lower insulating plastic plate, and the horizontal part of the pole post 600 form a high-top-hat shaped cavity in which a sealing element 500 is fitted. In this embodiment, the lower insulating plastic plate, the top cover, and the pole post are further positioned and engaged to prevent rotation between the top cover and the lower insulating plastic plate, and between the pole post and the lower insulating plastic plate, through the cooperation of the third limiting groove and the first limiting protrusion, and the second limiting protrusion and the fifth limiting groove.

[0047] The assembly process for the anti-rotation structure of the riveted top cover of the cylindrical battery in this embodiment is as follows:

[0048] 1. The ceramic limiting parts are respectively installed into the limiting through holes 240 of the upper insulating plastic plate 200, and the two are slightly interference fit;

[0049] 2. Install the sealing element 500 onto the pole post 600, and then place it into the riveting mold for fixture positioning;

[0050] 3. Place the lower insulating plastic plate 400 into the riveting mold: insert the pole post 600 into the fourth through hole 410, insert the second lower positioning protrusion 430 into the horizontal part of the pole post 600, and insert the second limiting protrusion 440 into the fifth limiting groove 630.

[0051] 4, Put the top cover into the riveting mold, the first limiting protrusion 420 is matched into the third limiting groove 340;

[0052] 5, Put the upper insulating plastic plate 200 into the positioning groove 310 on the upper surface of the top cover 300, and the lower part of the ceramic limiting part 600 is inserted into the second limiting groove 330;

[0053] 6, Put the riveting block 100 into the upper insulating plastic plate 100, and the upper part of the ceramic limiting part 600 is inserted into the first limiting groove 120;

[0054] 7, The riveting clamp presses down the riveting block 100, and the expansion riveting is completed;

[0055] 8, The riveting part (the upper end edge of the pole 600) is fixed by laser welding.

[0056] It should be noted that the shapes of the riveting block 100, the upper insulating plastic plate 200, the lower insulating plastic plate 400 and the like in the embodiment can also be square, and the corresponding matching structures can be adjusted adaptively on the basis of the foregoing embodiments, and the skilled in the art does not need to pay creative labor. In the embodiment, "close" adopted for the size relationship means that the sizes of the parts are close but allow small differences to meet the assembly, function or manufacturing needs.

Claims

1. A riveted top cover anti-rotation structure for a cylindrical battery, characterized in that, The utility model relates to a riveting block, the central region of the riveting block is provided with a first through hole, and the lower surface of the riveting block is provided with at least three first limiting grooves, and the first through hole is located in the region surrounded by the first limiting grooves. An upper insulating plastic plate is located below the riveting block and is provided with a limiting through hole at the corresponding position of the first limiting groove. A top cover is located below the upper insulating plastic plate and is provided with a second limiting groove at the corresponding position of the limiting through hole. A ceramic limiting piece is arranged in the limiting cavity formed by the first limiting groove, the limiting through hole and the second limiting groove. A lower insulating plastic plate is located below the top cover and is provided with a fourth through hole in the central region. The vertical part of the pole is a coaxial cylindrical upper segment and a cylindrical lower segment. The diameter of the cylindrical upper segment is smaller than that of the cylindrical lower segment and is close to the inner diameter of the first through hole.

2. The rivet top cover anti-rotation structure of a cylindrical battery according to claim 1, characterized by, The horizontal part of the pole abuts against the lower surface of the lower insulating plastic plate.

3. The rivet top cover anti-rotation structure of a cylindrical battery according to claim 1, characterized by, The cylindrical lower segment is arranged in the combined cavity of the second through hole, the third through hole and the fourth through hole and is sleeved with a matched sealing piece.

4. The riveted top cover anti-rotation structure of a cylindrical battery according to claim 1, characterized by The cylindrical upper segment is arranged in the first through hole, and the top edge thereof is connected to the upper end opening edge of the first through hole, so that the riveting block and the pole clamp the upper insulating plastic plate, the top cover and the lower insulating plastic plate.

5. The riveted top cover anti-rotation structure of a cylindrical battery according to claim 1, characterized by The first limiting grooves are uniformly distributed in a circumferential manner.

6. The riveted top cover anti-rotation structure of a cylindrical battery according to claim 1, characterized by An upper positioning protrusion is arranged at the edge of the upper surface of the upper insulating plastic plate.

7. The riveted top cover anti-rotation structure of a cylindrical battery according to any one of claims 1 to 6, characterized by The lower end opening edge of the second through hole is downwardly protruded in a cylindrical shape to form a first lower positioning protrusion.

8. The riveted top cover anti-rotation structure of a cylindrical battery according to claim 7, characterized by, The inner diameter of the first lower positioning protrusion is close to the inner diameter of the second through hole, and the outer diameter thereof is close to the inner diameter of the third through hole. The axial length of the first lower positioning protrusion is less than or equal to the depth of the third through hole. A positioning groove is arranged at the central position of the upper surface of the top cover. The inner side size of the positioning groove is close to the outer peripheral size of the upper insulating plastic plate. The top cover and the lower insulating plastic plate are provided with a first limiting protrusion and a third limiting groove matched with each other. A second lower positioning protrusion coaxial with the fourth through hole is formed on the lower surface of the lower insulating plastic plate. The inner diameter of the second lower positioning protrusion is close to the diameter of the circular horizontal part of the pole. A U-shaped fifth limiting groove is arranged on the edge of the horizontal part of the pole. A second limiting protrusion is arranged on the inner side wall of the ring of the second lower positioning protrusion at the position corresponding to the fifth limiting groove.

9. A cylindrical battery, characterized by A rivet top cover anti-rotation structure comprising the cylindrical battery as claimed in any one of claims 1 to 8. A rivet top cover anti-rotation structure comprising the cylindrical battery as claimed in any one of claims 1 to 8.

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