Battery and its cover

Abstract

The embodiment of the present application discloses a battery and its cover plate, the cover plate includes a cover body, a pole and a connector. A mounting groove is provided on one side surface of the cover body, and a mounting hole is provided at the bottom of the mounting groove; the pole is arranged relative to the mounting hole; the connector is made of an insulating material, and the connector is arranged around the axis of the mounting hole in a full circle on the pole, and a first seam arranged around the axis is formed between the connector and the pole, and the first seam is sealed and connected, and the connector is embedded in the mounting groove, and a second seam arranged around the axis is formed between the connector and the cover body, and the second seam is sealed and connected. In the embodiment of the present application, the cover plate reduces the number of parts, thereby reducing costs. The connector is embedded in the mounting groove, which is conducive to reducing the axial size of the cover plate in the mounting hole, thereby improving the volume energy density of the battery.

Description

Technical Field

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

[0002] As an energy storage unit, batteries are increasingly used in the electric vehicle industry and the energy storage industry.

[0003] The cover plate includes a plain aluminum sheet, a positive pole, a negative pole, a riveting block, a sealing ring, and a plastic cover. The plain aluminum sheet has through holes at the positions corresponding to the positive and negative poles. The assembly method is: insert the sealing ring into the pole, insert the assembly from the bottom of the plain aluminum sheet into the corresponding through hole, connect the riveting block with the pole, and form the plastic cover.

[0004] Traditional cover plates have many parts, resulting in higher cover plate costs. Summary of the invention

[0005] The embodiments of the present application provide a battery and a cover plate thereof, which reduce the number of components of the cover plate and lower the cost of the cover plate.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] In one aspect, a battery cover is provided, the cover comprising a cover body, a pole and a connector.

[0008] One side surface of the cover body is provided with a mounting groove, and the bottom of the mounting groove is provided with a penetrating mounting hole; the pole is arranged relative to the mounting hole; the connecting piece is made of an insulating material, and the connecting piece is arranged around the axis of the mounting hole in a full circle on the pole, and a first seam arranged around the axis is formed between the connecting piece and the pole, and the connection is sealed at the first seam; the connecting piece is embedded in the mounting groove, and a second seam arranged around the axis is formed between the connecting piece and the cover body, and the connection is sealed at the second seam.

[0009] In addition to one or more of the features disclosed above, or as an alternative, the connecting piece is welded to the pole to form a first welded connection portion that is arranged in a complete circle around the axis, and the first welded connection portion seals the first seam; the connecting piece is welded to the cover body to form a second welded connection portion that is arranged in a complete circle around the axis, and the second welded connection portion seals the second seam.

[0010] In addition to one or more features disclosed above, or as an alternative, the first welding connection is located on the side of the cover body having the mounting groove, and is located where the first seam contacts the outside world; the second welding connection is located on the side of the cover body having the mounting groove, and is located where the second seam contacts the outside world.

[0011] In addition to or as an alternative to one or more of the features disclosed above, at the point where the first seam contacts the outside, the connecting piece is flush with the pole; at the point where the second seam contacts the outside, the connecting piece is flush with the cover.

[0012] In addition to or as an alternative to one or more of the features disclosed above, on the side of the cover body having the mounting groove, the poles protrude from the cover body and the connecting member respectively.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the connecting piece is flush with the cover body, and the height of the pole protruding from the connecting piece is not less than 0.2 mm.

[0014] In addition to one or more of the features disclosed above, or as an alternative, along the axial direction of the mounting hole, the size of the connector is not less than 0.5 mm, and the size of the pole is not less than 1.7 mm; along the radial direction of the mounting hole, the distance between the outer edge of the protruding connector part of the pole and the inner edge of the connector is not less than 0.5 mm.

[0015] In addition to one or more of the features disclosed above, or as an alternative, the cover plate also includes an insulating member, a first portion of the insulating member is located on the side of the cover body facing away from the connecting member, a second portion of the insulating member is located on the side of the cover body facing the connecting member, a third portion of the insulating member is located in the mounting hole and respectively connects the first portion and the second portion, and the second portion is clamped between the connecting member and the cover body in the axial direction of the mounting hole.

[0016] In addition to or as an alternative to one or more of the features disclosed above, the edge of the mounting hole facing the connecting member has a notch, and the second part is accommodated in the notch; optionally, the second part is arranged in a full circle around the axis of the mounting hole.

[0017] On the other hand, a battery is provided, the battery comprising a shell, a cover plate and a battery cell. One side of the shell has an opening; the cover plate is arranged to cover the opening of the shell and to form a receiving cavity with the shell; the battery cell is received in the receiving cavity. The cover plate is any of the above-mentioned cover plates.

[0018] One of the above technical solutions has the following advantages or beneficial effects:

[0019] The connector is made of an insulating material, and is arranged around the axis of the mounting hole in a full circle on the pole. A first seam arranged around the axis is formed between the connector and the pole, and the connector and the pole are sealed at the first seam. The connector is embedded in the mounting groove, and a second seam arranged around the axis is formed between the connector and the cover body, and the connector and the cover body are sealed at the second seam. Compared with the prior art, the cover plate reduces the number of parts and components, thereby reducing costs. In addition, since the number of parts and components is reduced, the weight of the cover plate can also be reduced and the assembly process can be reduced. In addition, the connector is embedded in the mounting groove, which is conducive to reducing the axial size of the cover plate in the mounting hole, thereby improving the volume energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the cover plate in the related art;

[0022] Figure 2 yes Figure 1 A partial cross-sectional view of the cover plate at the pole;

[0023] Figure 3 is a three-dimensional exploded schematic diagram of a battery embodiment of the present application;

[0024] Figure 4 is a schematic diagram of the three-dimensional structure of an embodiment of the cover plate of the present application;

[0025] Figure 5 is a three-dimensional exploded view of an embodiment of a cover plate of the present application;

[0026] Figure 6 is a top view of an embodiment of a cover plate of the present application;

[0027] Figure 7 is a cross-sectional view of the cover plate embodiment of the present application in an assembled state (showing a partial part);

[0028] Figure 8 It is a cross-sectional view (partially showing) of the cover plate embodiment of the present application in a disassembled state.

[0029] Description of reference numerals: 201-cover; 203-pole; 205-rivet; 207-lower plastic; 209-upper plastic; 211-seal; 213-first assembly hole; 215-second assembly hole; 100-battery; 102 housing; 104 cover; 106 battery cell; 108-opening; 110-accommodating cavity; 112-cover; 114-outer surface; 115-explosion-proof valve; 116- Inner surface; 117-injection hole; 118-mounting groove; 120-mounting hole; 122-pole; 124-connector; 126-insulating member; 128-first joint; 130-second joint; 132-first welding connection; 134-second welding connection; 136-notch; 138-first part; 140-second part; 142-third part; 144-chamfer; L1-axis line. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and beneficial effects of this application clearer, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, 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 of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the cover plate in the related art. Figure 2 yes Figure 1The illustrated is a partial cross-sectional view of the cover plate at the pole 203 .

[0035] In the related art, the cover plate includes a cover body 201 , a pole 203 , a rivet 205 , a sealing member 211 , an upper plastic 209 and a lower plastic 207 .

[0036] The cover body 201 has a first assembly hole 213 extending therethrough. The first assembly hole 213 has an axis L0.

[0037] The lower plastic 207 has a penetrating second assembly hole 215 . The second assembly hole 215 is disposed opposite to the first assembly hole 213 .

[0038] The pole 203 is respectively disposed in the first assembly hole 213 and the second assembly hole 215 , and presses the lower plastic 207 against the cover 201 along the axis L0 , thereby fixing the lower plastic 207 to the cover 201 .

[0039] The seal 211 is used to seal the pole 203 and the cover 201. Specifically, the seal 211 is sleeved outside the pole 203, and is clamped between the pole 203 and the cover 201 along the radial direction of the first assembly hole 213, and is clamped between the lower plastic 207 and the cover 201 along the axial direction of the first assembly hole 213.

[0040] The rivet 205 and the lower plastic 207 are respectively disposed on two opposite sides of the cover 201. The rivet 205 is riveted to the pole 203.

[0041] The upper plastic 209 is disposed around the pole 203 and connects the rivet 205 to the cover 201. The upper plastic 209 can be formed between the rivet 205 and the cover 201 by injection molding.

[0042] When assembling the cover, the lower plastic 207 , the seal 211 , the pole 203 and the rivet 205 may be assembled to the cover 201 , and then the whole assembly may be put into an injection molding machine, and the upper plastic 209 may be molded in the injection molding machine.

[0043] In the related art, the cover plate has a large number of parts, a heavy weight, and many assembly steps, which results in a high cost of the cover plate and is not conducive to reducing the cost and weight of the battery.

[0044] In the related art, the height H1 of the pole 203 in the cover plate (the distance from the upper surface of the cover body 201 to the upper surface of the rivet 205) is relatively high, generally 3.2 mm, which is not conducive to improving the volume energy density of the battery.

[0045] The battery and the cover plate embodiments of the present application are used to solve the problems in the above-mentioned related technologies.

[0046] In the following embodiments of the battery, the battery is a battery that can be used continuously by activating the active material by charging after discharge, that is, a secondary battery.

[0047] Figure 3 It is a three-dimensional exploded view of an embodiment of a battery 100 of the present application.

[0048] In some embodiments, the battery 100 includes a housing 102 , a cover 104 , and a battery cell 106 .

[0049] One side of the housing 102 has an opening 108. Specifically, the housing 102 is substantially in the shape of a rectangular box and has an opening 108 at one end of the Z axis.

[0050] The cover plate 104 covers the opening 108 of the housing 102 and is surrounded by the housing 102 to form a receiving chamber 110 . The electrolyte is received in the receiving chamber 110 .

[0051] The battery cell 106 is accommodated in the accommodation cavity 110. The battery cell 106 may include a positive electrode sheet (not shown), a negative electrode sheet (not shown), and a separator (not shown). During the charging and discharging process of the battery 100, active ions are embedded and released back and forth between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet. The separator plays an isolation role. The electrolyte plays a role of conducting ions between the positive electrode sheet and the negative electrode sheet. In some embodiments, the battery cell 106 is formed by a winding process, that is, it is wound by the positive electrode sheet, the negative electrode sheet, and the separator. In other embodiments, the battery cell 106 is formed by a stacking process, that is, it is stacked by the positive electrode sheet, the negative electrode sheet, and the separator.

[0052] The battery 100 is not limited to the square battery shown in the figure. The present application does not limit the specific structure of the battery 100, and the improvement of the present application mainly lies in the cover plate 104.

[0053] Figure 4 It is a schematic diagram of the three-dimensional structure of the cover plate 104 embodiment of the present application. Figure 5 It is a three-dimensional exploded view of an embodiment of the cover plate 104 of the present application. Figure 6 It is a top view of an embodiment of the cover plate 104 of the present application.

[0054] In some embodiments, the cover plate 104 includes a cover body 112 , a pole 122 , a connector 124 , and an insulating member 126 .

[0055] The cover 112 is used to cover the opening 108 of the shell 102 of the battery 100, so as to form a receiving cavity 110 with the shell 102. The connector 124 fixes the pole 122 to the cover 112, so that the pole 122 is arranged relative to the mounting hole 120. A portion of the pole 122 is located in the receiving cavity 110 and is electrically connected to the battery cell 106. Another portion of the pole 122 is located outside the receiving cavity 110 for outputting current. A portion of the insulating member 126 is located on the side of the cover 112 facing the shell 102, so as to prevent the battery cell 106 from contacting the cover 112.

[0056] In some embodiments, the cover 112 is substantially in the shape of a plate, is made of aluminum or aluminum alloy, and is laser welded to the housing 102 .

[0057] In some embodiments, the cover 112 has a liquid injection hole 117 to inject electrolyte into the accommodating cavity 110 through the liquid injection hole 117 .

[0058] In some embodiments, the cover 112 has an explosion-proof valve 115 to release the high-pressure gas in the accommodating chamber 110 through the explosion-proof valve 115 .

[0059] In some embodiments, as shown in the figure, the number of poles 122 in the cover plate 104 is two, one pole 122 is the positive pole of the battery 100, and the other pole 122 is the negative pole of the battery 100. Correspondingly, the cover body 112 has two mounting holes 120, and the poles 122 correspond to the mounting holes 120 one by one. Each pole 122 is installed at the corresponding mounting hole 120. Correspondingly, the number of connectors 124 is two, and the connectors 124 correspond to the poles 122 one by one. Each connector 124 is used to fix the corresponding pole 122.

[0060] In other embodiments, the number of poles 122 in the cover plate 104 is one, and one pole 122 is the positive pole or the negative pole of the battery 100. For example, the battery 100 has two cover plates 104, wherein the pole 122 in one cover plate 104 is the positive pole of the battery 100, and the pole 122 in the other cover plate 104 is the negative pole of the battery 100.

[0061] In some embodiments, the mounting hole 120 is a circular hole. In other embodiments, the mounting hole 120 is a square hole, an elliptical hole or other irregularly shaped hole. The shape of the mounting hole 120 matches the shape of the pole 122. The specific shape of the mounting hole 120 is not limited.

[0062] Figure 7 It is a cross-sectional view (partially showing) of the cover plate 104 embodiment of the present application in an assembled state. Figure 8 It is a cross-sectional view (partially showing) of the cover plate 104 embodiment of the present application in a disassembled state.

[0063] In some embodiments, the cover 112 has an outer surface 114 facing away from the housing 102 and an inner surface 116 facing the housing 102. The cover 112 has a mounting groove 118 on the outer surface 114, and the mounting hole 120 is disposed at the bottom of the mounting groove 118. The mounting hole 120 has an axis L1. The axis L1 extends in the inner and outer directions of the accommodating cavity 110.

[0064] The pole 122 is arranged relative to the mounting hole 120. Specifically, the pole 122 is accommodated in the mounting hole 120, that is, the pole 122 is penetrated through the cover 112 through the mounting hole 120. The surface of the pole 122 facing away from the cover 112 is used to be electrically connected to the busbar to supply power to the outside. The surface of the pole 122 facing the accommodating cavity 110 is used to be electrically connected to the battery cell 106.

[0065] The connecting member 124 is made of an insulating material, such as ceramic. The connecting member 124 is arranged around the pole 122 in a full circle around the axis L1 of the mounting hole 120. A first joint 128 arranged around the axis L1 is formed between the connecting member 124 and the pole 122, and a sealing connection is made at the first joint 128. The connecting member 124 is embedded in the mounting groove 118. A second joint 130 arranged around the axis L1 is formed between the connecting member 124 and the cover 112, and a sealing connection is made at the second joint 130.

[0066] Compared with the prior art, the cover plate 104 reduces the number of parts, thereby reducing costs. In addition, due to the reduction in the number of parts, the weight of the cover plate 104 can also be reduced and the assembly process can be reduced. In addition, the connector 124 is embedded in the mounting groove 118, which is conducive to reducing the protruding height of the pole 122 in the axial direction of the mounting hole 120 while ensuring the axial dimension of the connector 124 in the mounting hole 120, that is, ensuring the structural strength of the connector 124, thereby reducing the axial dimension of the cover plate 104 in the mounting hole 120, thereby improving the volume energy density of the battery 100.

[0067] In some embodiments, the connector 124 is welded to the pole 122 to form a first welded connection 132 that is arranged in a circle around the axis L1. The first welded connection 132 seals the first seam 128. The connector 124 is welded to the cover 112 to form a second welded connection 134 that is arranged in a circle around the axis L1. The second welded connection 134 seals the second seam 130.

[0068] Specifically, in some embodiments, the connector 124 is made of ceramic material, and the connector 124 can be respectively welded to the cover 112 and the pole 122 by a brazing process. To improve the welding quality, in some embodiments, a metal layer is preformed on the surface to be welded of the connector 124, or a metal layer is preformed on the surface to be welded of the cover 112 and the pole 122.

[0069] In some other embodiments, the connector 124 is bonded to the pole 122 to form a first bonded connection portion that is arranged in a circle around the axis L1. The first bonded connection portion seals the first seam 128. The connector 124 is bonded to the cover 112 to form a second bonded connection portion that is arranged in a circle around the axis L1. The second bonded connection portion seals the second seam 130.

[0070] Specifically, in some embodiments, glue is applied to a pair of opposite surfaces of the connector 124 and the pole 122 along the radial direction of the mounting hole 120, and the connector 124 and the pole 122 are assembled so that the glue fills the first seam 128. After the glue solidifies, the connector 124 and the pole 122 are bonded. In other embodiments, after the connector 124 and the pole 122 are assembled, glue is injected into the first seam 128 so that the glue fills the first seam 128. After the glue solidifies, the connector 124 and the pole 122 are bonded. Similarly, the bonding connection between the connector 124 and the cover body 112 can be similar to the bonding connection between the connector 124 and the pole 122.

[0071] In some other implementations, the connector 124 is bonded to one of the pole 122 and the cover 112 , and is welded to the other of the pole 122 and the cover 112 .

[0072] The connection methods between the connecting member 124 and the pole 122 and the cover 112 are not limited to welding and bonding.

[0073] When the connector 124 is welded to the pole 122, in some embodiments, the connector 124 and the pole 122 are completely welded to a pair of opposite surfaces along the radial direction of the mounting hole 120, that is, the first welded connection portion 132 is cylindrical and annularly arranged on the axis L1. For example, the connector 124 is welded to the pole 122 by friction welding. In this way, the connection strength and sealing performance between the connector 124 and the pole 122 can be improved.

[0074] In the case where the connector 124 is welded to the pole 122, in other embodiments, in order to reduce the welding difficulty, the connector 124 is welded to the pole 122 at the place where the first seam 128 contacts the outside. The first welding connection portion 132 is annular and annular with the axis L1. For example, the connector 124 is welded to the pole 122 by laser welding. In this way, the process difficulty is reduced while ensuring the connection strength and sealing performance, which is conducive to controlling the welding deformation of the connector 124 and the pole 122.

[0075] Along the axial direction of the mounting hole 120, the first seam 128 has a first end away from the cover body 112 and a second end close to the cover body 112. In some embodiments, the insulating member 126 blocks the second end. In this case, in order to facilitate welding, the connector 124 is welded to the pole 122 at the first end of the first seam 128, and finally the first welded connection portion 132 is located on the side of the cover body 112 having the mounting groove 118 and at the place where the first seam 128 contacts the outside.

[0076] Furthermore, in some embodiments, at the place where the first joint 128 contacts the outside, the connector 124 is flush with the pole 122. In this way, during the welding operation, the welding equipment (laser welding head) or the cover plate 104 does not need to be tilted, which can improve the welding efficiency.

[0077] When the connector 124 is welded to the cover 112, in some embodiments, a pair of opposite surfaces of the connector 124 and the cover 112 along the radial direction of the mounting hole 120 are completely welded. The second welded connection portion 134 is cylindrical and annularly arranged on the axis L1. For example, the connector 124 is welded to the cover 112 by friction welding. In this way, the connection strength and sealing performance between the connector 124 and the cover 112 can be improved.

[0078] In the case where the connector 124 is welded to the cover body 112, in other embodiments, in order to reduce the difficulty of welding, the connector 124 is welded to the cover body 112 at the point where the second seam 130 contacts the outside, that is, the connector 124 is welded to the cover body 112 at the edge of the notch of the mounting groove 118. The second welded connection 134 is annular and arranged around the axis L1. For example, the connector 124 is welded to the cover body 112 by laser welding. Specifically, the second welded connection 134 is located on the side of the cover body 112 having the mounting groove 118, and is located at the point where the second seam 130 contacts the outside. In this way, while ensuring the connection strength and sealing performance, the process difficulty is reduced, which is conducive to controlling the welding deformation of the connector 124 and the cover body 112.

[0079] Further, in some embodiments, at the point where the second seam 130 contacts the outside, the connector 124 is flush with the cover 112. With this arrangement, during the welding operation, the welding equipment (laser welding head) or the cover plate 104 does not need to be tilted, which can improve welding efficiency.

[0080] In some embodiments, on the side of the cover 112 having the mounting groove 118, the pole 122 protrudes from the cover 112 and the connector 124, respectively. Further, in some embodiments, the connector 124 is flush with the cover 112, and the height H2 of the pole 122 protruding from the connector 124 is not less than 0.2 mm. Such a configuration can make it easier for the pole 122 to be electrically connected to external parts. In the application scenario where the pole 122 is welded to the bus bar, the pole 122 protrudes from the cover 112 and the connector 124, respectively, so that the bus bar is not interfered.

[0081] In some embodiments, along the axial direction of the mounting hole 120 , the dimension H3 of the connecting member 124 is not less than 0.5 mm. This arrangement can ensure the structural strength of the connecting member 124 .

[0082] In some embodiments, along the axial direction of the mounting hole 120 , the dimension H4 of the pole 122 is not less than 1.7 mm. This arrangement can ensure the structural strength of the pole 122 .

[0083] In some embodiments, along the radial direction of the mounting hole 120 , the distance L2 between the outer edge of the portion of the pole 122 protruding from the connector 124 and the inner edge of the connector 124 is not less than 0.5 mm. This arrangement can ensure that there is sufficient space to form the first welding connection portion 132 .

[0084] In some embodiments, with the axial direction of the mounting hole 120 as the projection direction, the projection of the mounting groove 118 is circular, the projection of the connector 124 seal is annular, and the projection of the mounting hole 120 is circular. The projection of the mounting groove 118, the projection of the connector 124, and the projection of the mounting hole 120 are coaxially arranged.

[0085] In some embodiments, the first portion 138 of the insulating member 126 is located on the side of the cover 112 facing away from the connector 124. The second portion 140 of the insulating member 126 is located on the side of the cover 112 facing the connector 124. The third portion 142 of the insulating member 126 is located in the mounting hole 120 and connects the first portion 138 and the second portion 140 respectively. The second portion 140 is sandwiched between the connector 124 and the cover 112 in the axial direction of the mounting hole 120.

[0086] When assembling the cover plate 104, the insulating member 126 is assembled to the cover body 112, and then the connecting member 124 is assembled. The insulating member 126 is buckled on the cover body 112 through the second portion 140. On this basis, the connecting member 124 presses against the second portion 140 of the insulating member 126, which can improve the fixing effect of the insulating member 126 on the cover body 112.

[0087] In some embodiments, the edge of the mounting hole 120 facing the connecting member 124 has a notch 136, and the second portion 140 is accommodated in the notch 136. Further, in the axial direction of the mounting hole 120, the thickness H5 of the second portion 140 is less than or equal to the depth H6 of the notch 136, so that the second portion 140 does not protrude from the bottom surface of the mounting groove 118. In this way, when the connecting member 124 is flush with the cover body 112, it is possible to prevent the second portion 140 from affecting the axial dimension of the connecting member 124 in the mounting hole 120.

[0088] In some embodiments, a depth H6 of the notch 136 in the axial direction of the mounting hole 120 is greater than or equal to 0.2 mm.

[0089] In some embodiments, a width L3 of the second portion 140 in the radial direction of the mounting hole 120 is greater than or equal to 0.5 mm.

[0090] In some embodiments, the second portion 140 is arranged in a circle around the axis L1 of the mounting hole 120, and correspondingly, the third portion 142 is arranged in a circle around the axis L1 of the mounting hole 120, and the notch 136 is arranged in a circle around the axis L1 of the mounting hole 120. Such a configuration can increase the area of ​​the insulating member 126 being pressed, and further improve the fixing effect of the insulating member 126.

[0091] In some embodiments, the outer edge of the second portion 140 is provided with a chamfer 144 , so that it is easier to assemble the insulating member 126 to the cover 112 through the mounting hole 120 .

[0092] The above embodiments can be reasonably combined as follows.

[0093] See also Figure 7 and Figure 8 Specifically, in some embodiments, the cover plate 104 includes a cover body 112 , a pole 122 , a connector 124 , and an insulating member 126 .

[0094] The cover body 112 is generally in the shape of a plate. The cover body 112 has an outer surface 114 of the back shell 102 and an inner surface 116 facing the shell 102. The cover body 112 has a mounting groove 118 on the outer surface 114, and the mounting hole 120 is arranged at the bottom of the groove of the mounting groove 118. The mounting hole 120 has an axis L1. The axis L1 extends in the inner and outer directions of the accommodating cavity 110. With the axial direction of the mounting hole 120 as the projection direction, the projection of the mounting groove 118 is circular, and the projection of the mounting hole 120 is circular. The projection of the mounting groove 118 and the projection of the mounting hole 120 are coaxially arranged. The edge of the mounting hole 120 facing the side of the outer surface 114 has a notch 136, and the notch 136 is arranged around the axis L1 in a full circle of the mounting hole 120. The depth H6 of the notch 136 in the axial direction of the mounting hole 120 is greater than or equal to 0.2 mm.

[0095] The insulating member 126 has a first portion 138 , a second portion 140 , and a third portion 142 .

[0096] The first portion 138 is located on the side of the cover 112 facing away from the connecting member 124 . The first portion 138 is generally in the shape of a flat plate and is attached to the inner surface 116 .

[0097] The second portion 140 is located on the side of the cover body 112 facing the connecting member 124. The second portion 140 is arranged in a full circle around the axis L1 of the mounting hole 120. The outer edge of the second portion 140 is provided with a chamfer 144. The second portion 140 is accommodated in the notch 136. In the axial direction of the mounting hole 120, the thickness H5 of the second portion 140 is less than or equal to the depth H6 of the notch 136. The width L3 of the second portion 140 in the radial direction of the mounting hole 120 is greater than or equal to 0.5 mm.

[0098] The third portion 142 is disposed in a complete circle around the axis L1 of the mounting hole 120 and connects the first portion 138 and the second portion 140 respectively. The third portion 142 is located in the mounting hole 120.

[0099] The connecting member 124 is embedded in the mounting groove 118. The second portion 140 is sandwiched between the connecting member 124 and the cover 112 in the axial direction of the mounting hole 120. The connecting member 124 is flush with the cover 112 in the axial direction of the mounting hole 120. The dimension H3 of the connecting member 124 in the axial direction of the mounting hole 120 is not less than 0.5 mm.

[0100] The connecting member 124 is made of insulating material, such as ceramic.

[0101] A second joint 130 is formed between the connector 124 and the cover 112 . The connector 124 and the cover 112 are welded at the second joint 130 in contact with the outside, and a second welded connection 134 is formed around the axis L1 . The second welded connection 134 seals the second joint 130 .

[0102] The pole 122 is arranged relative to the mounting hole 120. The connector 124 is arranged around the pole 122 in a full circle around the axis L1 of the mounting hole 120. Along the axial direction of the mounting hole 120, the dimension H4 of the pole 122 is not less than 1.7 mm. On the side of the cover body 112 having the mounting groove 118, the pole 122 protrudes from the cover body 112 and the connector 124 respectively. The height H2 of the pole 122 protruding from the connector 124 is not less than 0.2 mm. Along the radial direction of the mounting hole 120, the distance L2 between the outer edge of the part of the pole 122 protruding from the connector 124 and the inner edge of the connector 124 is not less than 0.5 mm.

[0103] A first joint 128 is formed between the connector 124 and the pole 122 and is arranged around the axis L1. At the place where the first joint 128 contacts the outside, the connector 124 is flush with the pole 122. The connector 124 and the pole 122 are welded and connected at the place where the first joint 128 contacts the outside, and form a first welded connection portion 132 arranged around the axis L1 in a full circle, and the first welded connection portion 132 seals the first joint 128.

[0104] The assembly process is as follows:

[0105] The insulating member 126 is assembled to the cover 112 through the mounting hole 120 .

[0106] The connecting member 124 is embedded in the mounting groove 118 so that the connecting member 124 presses against the second portion 140 of the insulating member 126 .

[0107] The pole 122 is passed through the connecting piece 124 and the mounting hole 120 .

[0108] The connector 124 and the pole 122 are welded together at the place where the first joint 128 contacts the outside, and a first welded connection portion 132 that is arranged in a full circle around the axis L1 is formed.

[0109] The connecting member 124 and the cover body 112 are welded together at the contact point between the second joint 130 and the outside, and a second welding connection portion 134 which is arranged in a complete circle around the axis L1 is formed.

[0110] In some embodiments, the connector 124 and the pole 122 may be welded to form an assembly, and then the assembly may be embedded in the mounting groove 118 so that the assembly presses against the second portion 140 of the insulating member 126 , and then the assembly may be welded to the cover 112 .

[0111] In summary, in the embodiment of the present application, the connector 124 is made of an insulating material, and the connector 124 is arranged around the axis L1 of the mounting hole 120 in a circle around the pole 122. The connector 124 and the pole 122 form a first seam 128 arranged around the axis L1, and are sealed at the first seam 128. The connector 124 is embedded in the mounting groove 118, and the connector 124 and the cover body 112 form a second seam 130 arranged around the axis L1, and are sealed at the second seam 130. Compared with the prior art, the cover plate 104 reduces the number of parts, thereby reducing costs. In addition, due to the reduction in the number of parts, the weight of the cover plate 104 can also be reduced and the assembly process can be reduced. In addition, the connector 124 is embedded in the mounting groove 118, which is conducive to reducing the axial size of the cover plate 104 in the mounting hole 120, thereby improving the volume energy density of the battery 100.

[0112] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery cover, characterized in that: include: A cover body, wherein a surface of one side of the cover body is provided with a mounting groove, and a bottom of the mounting groove is provided with a penetrating mounting hole; A pole, the pole being arranged relative to the mounting hole; A connecting piece, the connecting piece is made of an insulating material, the connecting piece is arranged around the axis of the mounting hole in a circle on the pole, a first seam arranged around the axis is formed between the connecting piece and the pole, and the connecting piece is sealed at the first seam, the connecting piece is embedded in the mounting groove, a second seam arranged around the axis is formed between the connecting piece and the cover body, and the connecting piece is sealed at the second seam; an insulating member, wherein a first portion of the insulating member is located on a side of the cover body facing away from the connecting member, a second portion of the insulating member is located on a side of the cover body facing the connecting member, a third portion of the insulating member is located in the mounting hole and respectively connects the first portion and the second portion, and the second portion is sandwiched between the connecting member and the cover body in the axial direction of the mounting hole; The edge of the mounting hole facing the connecting member has a notch, and the second part is accommodated in the notch; The connecting piece is welded to the pole to form a first welding connection portion which is arranged around the axis in a complete circle, and the first welding connection portion seals the first joint; The connecting piece is welded to the cover body to form a second welding connection portion that is arranged around the axis in a full circle, and the second welding connection portion seals the second seam.

2. The cover plate according to claim 1, characterized in that: The first welding connection portion is located at a side of the cover body having the mounting groove, and is located at a location where the first seam contacts the outside world; The second welding connection portion is located on a side of the cover body having the installation groove, and is located at a position where the second seam contacts the outside.

3. The cover plate according to claim 2, characterized in that: At the place where the first joint contacts the outside, the connecting piece is flush with the pole; At the place where the second seam contacts the outside, the connecting member is flush with the cover body.

4. The cover plate according to claim 1, characterized in that: On one side of the cover body having the mounting groove, the poles protrude from the cover body and the connecting member respectively.

5. The cover plate according to claim 4, characterized in that: The connecting piece is flush with the cover body, and the height of the pole protruding from the connecting piece is not less than 0.2 mm.

6. The cover plate according to claim 5, characterized in that: Along the axial direction of the mounting hole, the size of the connecting piece is not less than 0.5 mm, and the size of the pole is not less than 1.7 mm; Along the radial direction of the mounting hole, the distance between the outer edge of the portion of the pole protruding from the connector and the inner edge of the connector is not less than 0.5 mm.

7. The cover plate according to claim 6, characterized in that: The second portion is arranged in a complete circle around the axis of the mounting hole.

8. A battery, characterized in that: include: A housing, one side of which has an opening; A cover plate, the cover plate is arranged to cover the opening of the shell and is surrounded by the shell to form a receiving cavity; A battery cell, wherein the battery cell is accommodated in the accommodation cavity; Wherein, the cover plate is the cover plate according to any one of claims 1 to 7.

Images