Pole, cover plate assembly and battery

Abstract

The utility model discloses a pole, a cover plate assembly and a battery, the pole comprises a pole body and a shell arranged around the pole body, an insulating part is integrally formed between the shell and the pole body, the pole body is pressed and fixed in the shell by the insulating part, and the shell is insulated from the pole body. The pole body is covered with the shell and the insulation part, the stability of the relative position of the pole body can be guaranteed, the pole body is protected, the insulation part is arranged to make contact with the pole body, the sealing effect can be improved, the number of parts is reduced, the positioning and assembling requirements are reduced, the assembling precision is improved, and the assembling cost of the pole is reduced.

Description

Technical Field

[0001] The present application generally relates to the field of battery technology, and specifically to a pole, a cover plate assembly and a battery. Background Art

[0002] As the core components of power lithium batteries, the performance and function of battery structural parts are particularly important in the entire battery.

[0003] In the current battery structure, the poles, top cover plates, sealing rings and other components of the cover assembly are generally assembled separately. The complicated process leads to low efficiency, high cost and serious impact on the yield rate. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a pole, a cover plate assembly and a battery, which can simplify the manufacturing, assembly and installation of the pole.

[0005] In a first aspect, the present application provides a pole, which includes a pole body and a shell arranged around the pole body, an insulating member is integrally formed between the shell and the pole body, the insulating member presses and fixes the pole body in the shell, and insulates the shell from the pole body.

[0006] Optionally, the pole body includes a pole plate and a pole body, the pole body is arranged on the pole plate, the cross-sectional radius of the pole plate is larger than the cross-sectional radius of the pole body, and the insulating member presses and fixes the pole plate in the shell.

[0007] Optionally, the shell includes a first limiting portion, and the insulating member is fixedly arranged to cover the first limiting portion and press and fix the electrode plate.

[0008] Optionally, the shell includes a second limiting portion located at the bottom, and the insulating member presses and fixes the electrode plate on the second limiting portion.

[0009] Optionally, both ends of the shell have edge portions, one of which extends from the shell to the end of the pole body to form the first limiting portion, and the other edge portion extends from the shell to the end of the pole body to form the second limiting portion.

[0010] Optionally, a seal is further included, wherein the seal is disposed between the pole body and the second limiting portion, and the seal is used to insulate and seal the pole body and the second limiting portion.

[0011] Optionally, the second limiting portion is provided with an annular groove for fixing the sealing member, and the sealing member is provided with a protrusion engaged with the annular groove;

[0012] Alternatively, the second limiting portion is provided with an annular protrusion for fixing the sealing member; and the sealing member is provided with a groove for engaging with the annular protrusion.

[0013] Optionally, the insulating member is formed between the housing and the pole body by injection molding.

[0014] Optionally, at least one positioning hole is formed on the shell, and part of the insulating component is injection molded in the positioning hole.

[0015] In a second aspect, the present application provides a cover plate assembly, comprising a cover plate sheet and a pole as described above, wherein at least one pole hole is provided on the cover plate sheet, and a shell of the pole is welded in the pole hole.

[0016] Optionally, the pole hole is a stepped hole, the pole hole includes a stepped platform, and the second limiting portion on the shell is welded to the stepped platform.

[0017] Optionally, it further comprises a plastic part arranged on a side of the cover plate away from the pole, and the plastic part is provided with a via hole matching the pole hole.

[0018] In a third aspect, the present application provides a battery, comprising a housing and a cover assembly as described above that is sealed to the housing.

[0019] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0020] The pole provided in the embodiment of the present application can ensure the stability of the relative position of the pole body and protect the pole body by covering the shell and the insulating part outside the pole body. By setting the insulating part to contact the pole body, the sealing effect can be improved, the number of parts can be reduced, the positioning and assembly requirements can be reduced, the assembly accuracy can be improved, and the assembly cost of the pole can be reduced. Moreover, the pole of the embodiment of the present application can be easily welded to the battery cover assembly.

[0021] Furthermore, a first limiting portion for pressing the pole is provided at the top end of the shell of the pole, and a second limiting portion for supporting the pole is provided at the bottom end of the shell. An insulating part is then formed between the shell and the pole body through an injection molding process, and the pole body and the sealing part are fixed in the internal through cavity of the adapter shell, thereby effectively reducing the later assembly process, improving the sealing effect, reducing the number of parts, reducing the positioning assembly requirements, improving the assembly accuracy, and reducing the assembly cost of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 A schematic diagram of the structure of a pole provided in an embodiment of the present application;

[0024] Figure 2 An exploded schematic diagram of a pole provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of a pole body provided in an embodiment of the present application;

[0026] Figure 4 A partially cutaway schematic diagram of a housing provided in an embodiment of the present application;

[0027] Figure 5 A partially cutaway schematic diagram of a pole provided in an embodiment of the present application;

[0028] Figure 6 A schematic cross-sectional view of a pole provided in an embodiment of the present application;

[0029] Figure 7 A partially cutaway schematic diagram of another housing provided in an embodiment of the present application;

[0030] Figure 8 A schematic structural diagram of a sealing member provided in an embodiment of the present application;

[0031] Fig. 9 A schematic structural diagram of a cover plate assembly provided in an embodiment of the present application;

[0032] Fig.10 A cross-sectional schematic diagram of a cover plate assembly provided in an embodiment of the present application;

[0033] Fig.11 An enlarged cross-sectional schematic diagram of a cover plate assembly provided in an embodiment of the present application.

[0034] In the figure:

[0035] 100, housing; 200, pole body; 300, insulating member; 400, sealing member;

[0036] 121, first limiting portion; 122, second limiting portion; 1201, first through hole; 1202, second through hole; 1203, first outer surface; 1204, first inner surface; 1205, end surface;

[0037] 130, annular portion; 1301, second outer surface; 1302, second inner surface; 1303, positioning hole;

[0038] 140, annular groove; 150, annular protrusion; 160, laminated layer; 141, first bottom surface; 151, first top surface;

[0039] 210, polar plate; 220, polar body; 211, first surface; 212, second surface; 221, middle hole; 222, opening;

[0040] 310, first insulator part; 320, second insulator part; 330, third insulator part; 340, extending part;

[0041] 410, first sealing portion; 420, second sealing portion; 430, protrusion; 440, slot; 450, third through hole; 401, first sealing surface; 402, second sealing surface; 421, third top surface; 431, second top surface; 441, second bottom surface;

[0042] 500, cover plate; 600, plastic part; 501, pole hole; 502, step platform; 503, via hole; 504, welding hole. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] Please see Figure 1-2 The present application provides a pole, which includes a pole body 200 and a shell 100 arranged around the pole body 200, an integrally formed insulating member 300 is arranged between the shell 100 and the pole body 200, and the insulating member 300 presses and fixes the pole body 200 in the shell 100, and insulates the shell 100 from the pole body 200.

[0046] In the embodiment of the present application, the shell 100 and the insulating member 300 at least cover the outside of the pole body 200, which can ensure the stability of the relative position of the pole body 200 and protect the pole body 200. By setting the insulating member 300 to contact the pole body 200, the sealing effect can be improved, the number of parts can be reduced, the positioning and assembly requirements can be reduced, the assembly accuracy can be improved, and the assembly cost of the pole can be reduced.

[0047] Alternatively, if Figure 3As shown, the pole body 200 includes a pole plate 210 and a pole body 220, the pole body 220 is arranged on the pole plate 210, the pole plate 210 includes a first surface 211 and a second surface 212 arranged opposite to each other along the axial direction, the pole body 220 is arranged on the second surface 212; the cross-sectional radius of the pole plate 210 is greater than the cross-sectional radius of the pole body 220, and the insulating member 300 presses and fixes the pole plate 210 in the housing 100. It should be noted that the pole plate 210 and the pole body 220 can be formed in an integral molding manner.

[0048] The shape of the pole plate 210 and the pole body 220 can be a columnar body extending along the axis direction, such as a cylinder, a prism, etc. The shape of the pole plate 210 and the pole body 220 on the cross section of the axis can be a polygon such as a circle, a triangle, a quadrilateral, etc., so that when set, the axis of the pole plate 210 and the axis of the pole body 220 coincide. In the embodiment of the present application, the cross-sectional shape is a circle for exemplary description. In the embodiment of the present application, the cross-sectional radius is defined as the maximum distance from the edge of the cross section to the center of the cross section in the cross section perpendicular to the axis direction. In the embodiment of the present application, the cross-sectional radius of the pole plate 210 and the pole body 220 is not limited. The cross-sectional radius in this embodiment is the radius of the circular cross section.

[0049] In addition, in the embodiment of the present application, the pole body 220 is provided with a middle hole 221 at the position corresponding to the axis. The middle hole 221 is used for CCD positioning when the battery cells are subsequently assembled into modules and welded to the busbar, which facilitates the welding positioning of the busbar.

[0050] The pole plate 210 is provided with at least one opening 222 facing outward at its circumferential edge position, and the insulating member 300 is formed with a protruding sub-portion 340 cooperating with the opening 222 on its circumferential inner side. After the insulating member 300 is integrally formed (for example, by injection molding or other technology), the protruding sub-portion 340 is fixed in the opening 222, further avoiding rotation between the insulating member 300 and the pole body 200, improving the fixing effect and installation accuracy of the insulating member 300 and the pole plate 210, and preventing the insulating member 300 from being damaged.

[0051] Optionally, the housing 100 includes a first limiting portion 121, and the insulating member 300 is fixedly arranged to cover the first limiting portion 121 and press and fix the electrode plate 210. Optionally, the housing 100 includes a second limiting portion 122 located at the bottom, and the insulating member 300 presses and fixes the electrode plate 210 on the second limiting portion 122.

[0052] The formation method of the first limiting portion 121 and the second limiting portion 122 is not limited in the embodiment of the present application, and they can be formed by bending, or fixed to a part of the shell by welding or the like. In order to facilitate the installation of the pole, in the present embodiment, preferably, both ends of the shell 100 have edge portions, one of which extends from the outer direction of the pole body 200 to the inner direction (the position of the end of the pole body 200) to form the first limiting portion 121, and the other edge portion extends from the shell 100 to the end of the pole body 200 to form the second limiting portion 122. In the embodiment of the present application, one of the edge portions is the first limiting portion 121, and the other edge portion is the second limiting portion 122, a part of the pole body 200 is located between the first limiting portion 121 and the second limiting portion 122, and one end of the pole body 200 protrudes from the first limiting portion 121. More specifically, in combination with Figure 5 , Figure 6 As shown, in the extended axial direction, the end of the pole body 200 is more protruding than the edge of the housing 100 and the insulating member 300. Such an arrangement is conducive to the subsequent welding of the pole and the busbar when the battery cells are assembled into a module.

[0053] In this embodiment, the insulating member 300 is in close contact with the pole body 200 , and the insulating member 300 at least covers the first limiting portion 121 .

[0054] It should be noted that the arrangement position of the insulating member 300 is not limited in the embodiment of the present application. The insulating member 300 can be covered on the first limiting portion 121, and the insulating member 300 can also be covered on other limiting portions formed on the housing 100, as long as the insulating member 300 can be formed and fixed, and the insulating member 300 can be pressed and fixed to the pole body 200. In the embodiment of the present application, the insulating member 300 is covered on the first limiting portion 121 as an example for exemplary description.

[0055] In the embodiment of the present application, the first limiting portion 121 and the second limiting portion 122 are arranged opposite to each other in the axial direction of the pole body 200. Figure 5 , Figure 6As shown, the portion of the housing 100 extending in the axial direction is defined as an annular portion, the first limiting portion 121 can be arranged at the upper end of the annular portion 130, and the second limiting portion 122 is arranged at the lower end of the annular portion 130, so as to limit the pole body 200. The pole body 200 is pressed between the first limiting portion 121 and the second limiting portion 122, the first limiting portion 121 is arranged on one side of the pole protruding end, and the second limiting portion 122 is arranged on the side away from the pole protruding end, and the pole protruding end can be used as the positive or negative pole of the battery.

[0056] like Figure 4 As shown, the shell 100 includes an annular portion 130 connected between the first limiting portion 121 and the second limiting portion 122, and the open space enclosed by the annular portion 130, the second limiting portion 122, and the first limiting portion 121 is defined as a mounting cavity, and at least a portion of the pole plate 210 is placed in the mounting cavity, wherein, in the axial extension direction of the pole body 200, one end of the pole body 220 protrudes out of the mounting cavity.

[0057] In the embodiment of the present application, the diameters of the annular portion 130, the second limiting portion 122 and the first limiting portion 121 are not limited. By way of example, the cross-sectional radius of the annular portion 130 is greater than the cross-sectional radius of the electrode plate 210, the first limiting portion 121 is provided with a first through hole 1201, one end of the electrode body 220 passes through the first through hole 1201 and protrudes from the mounting cavity, the cross-sectional radius of the first through hole 1201 is greater than the cross-sectional radius of the electrode body 220; the second limiting portion 122 is provided with a second through hole 1202, the connecting piece on the battery cell can be electrically connected to the electrode plate 210 through the second through hole 1202, and the cross-sectional radius of the second through hole 1202 is smaller than the cross-sectional radius of the electrode plate 210.

[0058] The shapes of the annular portion 130, the second limiting portion 122, and the first limiting portion 121 can be adapted to the shapes of the pole plate 210 and the pole body 220, and the axes of the annular portion 130, the second limiting portion 122, and the first limiting portion 121 can coincide with the axis of the pole body 200, and the cross-sectional shapes of the pole plate 210 and the pole body 200 can be polygonal shapes such as a circle, a triangle, and a quadrilateral. In the embodiment of the present application, the annular portion 130, the second limiting portion 122, and the first limiting portion 121 are enclosed to form an installation cavity, and a partial structure of the pole body 200 is arranged in the installation cavity. The insulating member 300 is injection-molded and fixed between the installation cavity and the pole body 200 by injection molding, so that the insulating member 300 seals the gap between the pole body 200 and the housing 100 in the installation cavity.

[0059] Optionally, the insulating member 300 is injection molded between the housing 100 and the pole body 200 by means of an injection mold. The metal material of the housing 100 may be, for example, copper, copper alloy, aluminum or aluminum alloy. The insulating member 300 may be made of a plastic material that is resistant to high temperature and does not deform and has high insulation properties, such as alumina, silicon nitride, polyperfluoroethylene propylene (FEP), polyimide (PI), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyvinylidene fluoride (PVDF), polyphenylene oxide (PPO), etc.

[0060] For example, the metal housing 100 with the first limiting portion 121 is placed in an injection mold, and the plastic material is injected into the mold to form an injection-molded integrated structure. The integrated formation method can simplify the formation of the housing 100, and the structure is simple, the operation is convenient, and modular installation can be achieved.

[0061] It should be noted that, in the embodiment of the present application, the insulating member 300 can be formed after the housing 100 is loaded into the pole body 200, and the housing 100 is bent and then an integrated structure is formed by injection molding. In this embodiment, the insulating member 300 can be fixedly connected to the housing 100 and the pole body 200 by plastic material during the integrated molding process. By injection molding, the setting method of the insulating member 100 can be simplified to further simplify the combination and assembly method of the pole, and the connection strength and sealing performance between the housing 100 and the pole body 200 can also be improved.

[0062] like Figure 5-6 As shown, the first limiting portion 121 includes a first outer surface 1203 and a first inner surface 1204, the first inner surface 1204 is located on one side of the installation cavity, and the first limiting portion 121 also includes an end surface 1205 connecting the first outer surface 1203 and the first inner surface 1204; the annular portion 130 includes a second outer surface 1301 and a second inner surface 1302, and the second inner surface 1302 is located on one side of the installation cavity.

[0063] like Figure 5 , Figure 6As shown, in a cross-sectional view along the axial direction of the pole body 200, the insulating member 300 extends from between the pole body 200 and the housing 100 to the outside of the housing 100, and covers at least the first limiting portion 121. The extended portion of the insulating member 300 includes a first insulator portion 310 covering the first outer surface 1203 and a portion of the second outer surface 1301, a second insulator portion 320 covering the first inner surface 1204 and a portion of the second inner surface 1302, and a third insulator portion 330 covering the end surface 1205, and the first insulator portion 310, the third insulator portion 330, and the second insulator portion 320 are continuously arranged on a path extending from between the pole body 200 and the housing 100 to the outside of the housing 100.

[0064] In the embodiment of the present application, by arranging the first insulator part 310, the second insulator part 320, and the third insulator part 330 on the housing 100, the housing 100 can be prevented from contacting with the pole body 200, so as to achieve insulation and sealing between the housing 100 and the pole body 200, and to achieve external insulation of other regions of the pole except the pole body 200. In addition, the first insulator part 310, the second insulator part 320, and the third insulator part 330 can also improve the mechanical properties of the pole, for example, the mechanical strength, deformation resistance, stability, high temperature resistance, corrosion resistance, etc. of the pole.

[0065] The third insulator portion 330 conformally covers the end surface 1205 of the first limiting portion 121, that is, is located in the first through hole 1201 formed in the first limiting portion 121. One side surface of the third insulator portion 330 is adapted to the shape of the end surface 1205 of the first limiting portion 121, and the other side surface is adapted to the surface shape of the pole body 200. The second insulator portion 320 conformally covers the first inner surface 1204 of the first limiting portion 121 and part of the second inner surface 1302 of the annular portion 130 and is adapted to the shape, and the other side surface is adapted to the surface shape of the pole body 200.

[0066] It should be noted that the embodiment of the present application does not limit the extension height of the first insulator part 310 and the second insulator part 320 on the housing 100, that is, the distance to the second limiting part 122, and is set as needed in different embodiments.

[0067] In one embodiment of the present application, the extension height of the first insulator part 310 and the second insulator part 320 on the annular part 130 is equal to the distance between the second surface 212 of the pole body 200 and the second stopper 122, that is, the bottom end of the first insulator part 310 is flush with the second surface 212 of the pole body 200. In another embodiment of the present application, the extension height of the first insulator part 310 is flush with the surface on the cover plate 500, which can facilitate the installation of the pole and the cover plate 500, improve the installation performance and the sealing performance of the pole and the cover plate 500, and improve the mechanical performance of the cover plate assembly.

[0068] It should also be noted that, in the embodiment of the present application, the thickness of the first insulator portion 310, the second insulator portion 320, and the third insulator portion 330 is not limited. The thickness of the first insulator portion 310, the second insulator portion 320, and the third insulator portion 330 can be the same or different, and can be set as required in different embodiments. In this embodiment, the housing 100 and the insulating member 300 can be formed by an integral injection molding method, which simplifies the forming method and improves the mechanical properties of the pole.

[0069] It should be noted that in the embodiment of the present application, part of the surface of the pole body 200 and part of the surface of the shell 100 are not formed with plastic material, and the excess plastic on the area can be removed by various stripping methods in the prior art, and it can also be circumvented by the shape of the mold cavity, and the present application does not limit this.

[0070] Optionally, at least one positioning hole 1303 is provided on the housing 100, and part of the insulating member 300 is injection molded in the positioning hole 1303. The first insulator portion 310 is connected to the second insulator portion 320 through the positioning hole 1303. In the embodiment of the present application, by providing the positioning hole 1303 at any position of the annular portion 130, the first limiting portion 121, and the second limiting portion 122 of the housing 100, it is convenient for the outer surface of the housing 100 to flow with the insulating plastic material formed in the installation cavity, improve the forming effect of the insulating member 300, and at the same time, the integral connection structure of the insulating member 300 and the housing 100 can be realized, which can further improve the structural strength, connection strength and sealing of the housing 100. In this embodiment, the position, number and size of the positioning hole 1303 are not limited, and the number of the positioning holes 1303 can be one, two or more.

[0071] In the embodiment of the present application, the insulating member 300 conformally covers a portion of the surface of the shell 100 and is adapted to the surface shape of the pole body 200, wherein the second insulator portion 320 is pressed against the first circumferential surface of the pole plate 210 and the first surface 211, and the third insulator portion 330 is pressed against the second circumferential surface of the pole body 220; the second limiting portion 122 is pressed against the second surface 212.

[0072] It should be noted that, in this embodiment, the insulating member 300 can prevent the shell 100 from contacting the pole body 200, thereby achieving insulation between the shell 100 and the pole body 200. On the other hand, the pole body 200 can be fixed. The direct contact between the insulating member 300 and the pole body 200 can prevent the pole body 200 from being damaged when the pole body 200 and the shell 100 are installed. When applied to a battery module, the pole body 200 can be prevented from being damaged due to shaking or collision, thereby improving the mechanical properties and service life of the pole.

[0073] Alternatively, if Figure 7 As shown, the first limiting portion 121 is a bendable structure, and the first limiting portion 121 includes at least two layers of stacked layers 160 formed by bending. When the stacked layer 160 includes at least two layers, the bending directions of the two adjacent layers of the stacked layers 160 are opposite; the insulating member 300 fills the gap between the two adjacent layers of the stacked layers 160, further improving the fixing effect between the insulating member 300 and the shell 100.

[0074] In the embodiment of the present application, the number of bending layers of the first limiting portion 121 is not limited, and can be set as needed in different embodiments, and the number of the stacked layers 160 can be two, three or more layers. By setting at least two stacked layers 160, the degree of pressing of the first limiting portion 121 can be improved, and by filling the plastic material of the insulating layer between the adjacent stacked layers 160 of the first limiting portion 121, the connection strength of the pole can be further improved to prevent the pole body 200 from shaking.

[0075] When provided, the first limiting portion 121 is used to be formed by bending the protruding portion 430 toward the center direction of the pole body 200 after the pole body 200 is placed in the installation cavity. When the number of layers of the laminated layer 160 is two, the protruding portion 430 is bent once toward the center direction of the pole body 200 and then continues to bend away from the center direction of the pole body 200.

[0076] Furthermore, if Figure 5 , Figure 6 and Figure 8As shown, the pole further includes a seal 400 , which is disposed between the pole body 200 and the second limiting portion 122 , and is used to insulate and seal the pole body 200 and the second limiting portion 122 .

[0077] In the embodiment of the present application, by setting an insulating member 300 on the first limiting portion 121, the first through hole 1201 can be insulated and sealed. By setting a sealing member 400 on the second limiting portion 122, the second through hole 1202 can be insulated and sealed. The elasticity of the sealing member 400 is greater than the elasticity of the insulating member 300. By setting the sealing member 400, the degree of compression of the second limiting portion 122 and the insulating member 300 on the pole body 200 can be controlled to improve the compression effect, further improve the sealing effect, prevent the pole body 200 from being damaged during the installation process, and improve the mechanical properties of the pole.

[0078] like Figure 8 As shown, the sealing member 400 includes a first sealing portion 410 and a second sealing portion 420, the first sealing portion 410 includes a first sealing surface 401 and a second sealing surface 402 arranged opposite to each other, the first sealing surface 401 is in sealing contact with the first surface 211 of the electrode plate 210, the second sealing surface 402 is in sealing contact with the second limiting portion 122, the second sealing portion 420 is arranged on the second sealing surface 402, the second sealing portion 420 is embedded in the second through hole 1202, the two sides of the first sealing portion 410 are in tight contact with the second limiting portion 122 and the first surface 211 respectively, the second limiting portion 122 is provided with a supporting surface, and the first sealing portion 410 is in tight contact with the supporting surface.

[0079] The sealing member 400 is provided with a third through hole 450, the axis of the third through hole 450 coincides with the axis of the second through hole 1202, and the third through hole 450 is used to electrically connect the pole body 200 with the connector of the battery cell. The outer diameter of the second sealing portion 420 is greater than or equal to the diameter of the second through hole 1202, and the second sealing portion 420 can be compressed and arranged in the second through hole 1202 to achieve sealing and insulation of the pole body 200 and the second limiting portion 122 of the second through hole 1202, and insulation of the connector of the battery cell and the housing 100 can be achieved.

[0080] Optionally, the second limiting portion 122 is provided with an annular groove 140 for fixing the seal 400, and the seal 400 is provided with a protrusion 430 engaged with the annular groove 140. The annular groove 140 is provided on the support surface, and the protrusion 430 is provided on the second sealing surface 402. The annular groove 140 and the protrusion 430 can realize the fixed connection of the seal 400, improve the sealing degree of the pole, and prevent the pole body 200 from shaking.

[0081] Optionally, the second limiting portion 122 is provided with an annular protrusion 150 for fixing the seal 400; the seal 400 is provided with a clamping groove 440 clamped with the annular protrusion 150. The annular protrusion 150 is provided on the supporting surface, and the clamping groove 440 is provided on the second sealing surface 402. The annular protrusion 150 and the clamping groove 440 can realize the fixed connection of the seal 400, improve the sealing degree of the pole, and prevent the pole body 200 from shaking.

[0082] It should be noted that, along the axial direction of the pole body 220, the annular groove 140 is recessed toward the side away from the pole body 220, and the annular protrusion 150 is protruding toward the side close to the pole body 220. By extending the sealing member 400 and the supporting surface in two directions, the sealing contact area between the second sealing surface 402 and the supporting surface can be increased, thereby improving the sealing degree.

[0083] In the embodiment of the present application, the cross-sectional shapes of the annular groove 140 , the protruding portion 430 , the annular protrusion 150 and the locking groove 440 are not limited, and their cross-sectional shapes may be square, trapezoidal, etc.

[0084] Optionally, the second limiting portion 122 is provided with an annular groove 140 and an annular protrusion 150 for fixing the seal 400, and the annular groove 140 and the annular protrusion 150 are both arranged on the supporting surface, and the annular groove 140 and the annular protrusion 150 are both arranged to be closed circles. The number of the annular groove 140 and the annular protrusion 150 can be set to one or more, and can be set as needed in different embodiments. By setting one or more annular grooves 140 and annular protrusions 150, the sealing between the supporting surface and the second sealing surface 402 can be improved, thereby playing a role of multiple sealing, extending the battery leakage path, and improving the sealing effect of the seal 400.

[0085] In this embodiment, the positions of the annular groove 140 and the annular protrusion 150 are not limited. When setting, the second limiting portion 122 includes an annular protrusion 150 arranged between the annular protrusion 150 and the third through hole 450. The annular protrusion 150 can be formed by bending the end of the second limiting portion 122 upward, which can facilitate the setting of the annular protrusion 150, that is, the second through hole 1202 is formed around the annular protrusion 150, and the sealing degree at the position of the second through hole 1202 can be improved by the annular protrusion 150.

[0086] In this embodiment, the sizes of the annular groove 140 and the annular protrusion 150 are not limited. For example, the outer diameter of the annular groove 140 can be larger than the outer diameter of the first sealing portion 410. The pole is pressed tightly in the accommodating cavity and the sealing member 400 is pressed, so that the outer diameter surface of the annular groove 140 can be in sealing contact with the outer diameter surface of the first sealing portion 410 to improve the sealing effect. Of course, in other embodiments, the inner diameter of the annular groove 140 can be smaller than the inner diameter of the first sealing portion 410 to further improve the sealing effect.

[0087] The annular groove 140 includes a first bottom surface 141 , the annular protrusion 150 includes a first top surface 151 , the protrusion 430 includes a second top surface 431 , the slot 440 includes a second bottom surface 441 , the second top surface 431 is in sealing contact with the first bottom surface 141 , and the second bottom surface 441 is in sealing contact with the first top surface 151 .

[0088] In the present application, in the initial state or when the seal 400 is in an uncompressed state, the distance between the first bottom surface 141 and the first top surface 151 is less than or equal to the distance between the second bottom surface 441 and the second top surface 431, and the compression degree of the seal 400 can be limited by limiting the distance between the second bottom surface 441 and the second top surface 431. For example, the compression amount of the seal 400 is 10%-50%, and the sealing degree between the seal 400 and the pole body 200 and the second limiting portion 122 can be controlled by controlling the compression amount of the seal 400, thereby increasing the friction between the seal 400 and the pole body 200, and preventing the pole body 200 from rotating relative to the housing 100.

[0089] The second sealing portion 420 includes a third top surface 421, and the distance from the third top surface 421 to the second bottom surface 441 is greater than the distance from the second top surface 431 to the second bottom surface 441, and the distance from the third top surface 421 to the second bottom surface 441 is greater than the distance from the first top surface 151 to the side surface of the second limiting portion 122 away from the installation cavity. The length of the second sealing portion 420 extends to the outside of the second limiting portion 122, thereby improving the sealing degree and insulation performance of the second through hole 1202, effectively preventing internal leakage of the battery, and improving the battery life.

[0090] The present application also provides a method for forming a pole as described above, the method comprising:

[0091] S100, placing the pole body 200 in the housing 100, so that the housing 100 is disposed around the pole body 200;

[0092] S200 , forming an insulating member 300 between the pole body 200 and the housing 100 by injection molding to insulate the pole body 200 from the housing 100 .

[0093] In this embodiment, the insulating member 300 formed by injection molding between the pole body 200 and the housing 100 includes:

[0094] S210, forming a first limiting portion 121 and a second limiting portion 122 on the housing 100, wherein a gap is formed between the first limiting portion 121, the second limiting portion 122 and the pole body 200;

[0095] S220, the insulating member 300 is formed by covering the first limiting portion 121 at the gap position by injection molding, and the insulating member 300 presses and fixes the pole body 200 to the second limiting portion 122. In one embodiment of the present application, in the specific operation:

[0096] S211 , bend one end of the shell 100 toward the center to form the second limiting portion 122 , and fix the sealing member 400 on the second limiting portion 122 .

[0097] S212 , placing the pole body 200 in the annular portion 130 and making contact with the sealing member 400 .

[0098] S213. On the molding die, the other end of the shell 100 is bent toward the center direction of the pole body 200 by a jig to form a first limiting portion 121. The molding die is used to fix the position of the pole body 200 and extrude and fit the seal 400. The molding die is also used to limit the first limiting portion 121 after bending.

[0099] S214 , forming an insulating member 300 on the first limiting portion 121 by an integrated injection molding method on a molding die.

[0100] In the embodiment of the present application, the first limiting portion 121 and the second limiting portion 122 are realized by bending, and the insulating member 300 is formed by one-piece injection molding, which can simplify the structure of the pole body 200 assembly, reduce the number of parts, reduce positioning and assembly requirements, improve assembly accuracy, and reduce the assembly cost of the pole.

[0101] Based on the same concept, Figure 9-11 As shown, the present application provides a cover plate assembly, including a cover plate sheet 500 and a pole as described above, wherein at least one pole hole 501 is provided on the cover plate sheet 500 , and a shell 100 of the pole is welded in the pole hole 501 .

[0102] When set, the pole hole 501 is a stepped hole, and the pole hole 501 includes a stepped platform 502, and the second limiting portion 122 on the housing 100 is welded to the stepped platform 502. In the embodiment of the present application, the end of the first insulator portion 310 extends to the surface of the cover plate 500 and is flush with the surface of the cover plate 500. The shape of the pole hole 501 matches the shape of the annular portion 130 and the second limiting portion 122, that is, the part of the annular portion 130 and the second limiting portion 122 where the insulating member 300 is not set are located in the pole hole 501. In this way, the sealing performance at the position of the pole hole 501 can be improved.

[0103] The large hole diameter of the stepped hole matches the outer diameter of the annular portion 130, and the inner diameter of the stepped hole matches the diameter of the first through hole 1201, so as to achieve the fixation and installation of the pole body 200. The second sealing portion 420 of the seal 400 can extend to the inner diameter of the pole hole 501 to improve the sealing effect. The second limiting portion 122 can be fixedly arranged on the stepped platform 502 by ultrasonic welding or the like to achieve the installation of the pole. During welding, a welding hole 504 can be arranged on the surface of the side of the cover plate 500 away from the shell, and the second limiting portion 122 is welded and fixed to the stepped platform 502 through the welding hole 504.

[0104] The cover plate assembly further comprises a plastic part 600 disposed on the side of the cover plate 500 away from the pole, and the plastic part 600 is provided with a through hole 503 matching the pole hole 501. The through hole 503 can realize the electrical connection between the connecting piece of the battery and the pole body 200.

[0105] The present application also provides a method for forming a cover plate assembly as described above, the method comprising:

[0106] The pole is placed in the pole hole 501 of the cover plate 500 , and the housing 100 and the cover plate 500 are welded.

[0107] In the embodiment of the present application, the welding position of the shell 100 and the cover plate 500 is not limited. The surface of the annular portion 130 can be welded to the surface of the cover plate 500. Preferably, the second limiting portion 122 can also be welded to the surface of the step platform 502. On the one hand, it can facilitate welding and prevent damage to the insulating part 300 and the sealing part 400 during the welding process. On the other hand, the welding area is larger, which can effectively improve the connection strength and sealing performance of the cover plate assembly.

[0108] Based on the same concept, the present application provides a battery, comprising a housing and a cover assembly as described above and sealed to the housing.

[0109] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0110] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. 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 utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0111] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article may indicate that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0112] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of the protection claimed by the utility model.

Claims

1. A pole, characterized in that: The pole comprises a pole body and a shell arranged around the pole body, an insulating member is integrally formed between the shell and the pole body, the insulating member presses and fixes the pole body in the shell, and insulates the shell from the pole body; The shell includes a first limiting portion and a second limiting portion, and both ends of the shell have edge portions, one of the edge portions extends from the shell to the end of the pole body to form the first limiting portion, and the other edge portion extends from the shell to the end of the pole body to form the second limiting portion.

2. The pole according to claim 1, characterized in that: The pole body comprises a pole plate and a pole body, wherein the pole body is arranged on the pole plate, and the insulating member presses and fixes the pole plate in the shell.

3. The pole according to claim 2, characterized in that: The insulating member is fixedly arranged to cover the first limiting portion and press and fix the electrode plate.

4. The pole according to claim 3, characterized in that: The second limiting portion is located at the bottom of the shell, and the insulating member presses and fixes the pole plate on the second limiting portion.

5. The pole according to claim 4, characterized in that: It also includes a seal, which is arranged between the pole body and the second limiting portion, and is used to insulate and seal the pole body and the second limiting portion.

6. The pole according to claim 5, characterized in that: The second limiting portion is provided with an annular groove for fixing the sealing member, and the sealing member is provided with a protrusion engaged with the annular groove; Alternatively, the second limiting portion is provided with an annular protrusion for fixing the sealing member; and the sealing member is provided with a groove for engaging with the annular protrusion.

7. The pole according to any one of claims 1 to 6, characterized in that: The insulating member is formed between the shell and the pole body by injection molding.

8. The pole according to claim 7, characterized in that: At least one positioning hole is formed on the shell, and part of the insulating component is injection molded in the positioning hole.

9. A cover plate assembly, characterized in that: It comprises a cover plate and a pole as claimed in any one of claims 1 to 8, wherein the cover plate is provided with at least one pole hole, and a shell of the pole is welded in the pole hole.

10. The cover plate assembly according to claim 9, characterized in that: The pole hole is a stepped hole, and the pole hole includes a stepped platform, and the second limiting portion on the shell is welded to the stepped platform.

11. The cover plate assembly according to claim 9, characterized in that: It also includes a plastic part arranged on a side of the cover plate away from the pole, and the plastic part is provided with a through hole matched with the pole hole.

12. A battery, characterized in that: It comprises a shell and a cover plate assembly as described in any one of claims 9 to 11 which is sealed and connected to the shell.

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