Cover plate assembly and battery

Abstract

The present application relates to the technical field of batteries, and discloses a cover plate assembly and a battery. The cover plate assembly comprises a base plate, a pole, a support member, and an injection-molded connecting member. The pole passes through the cover plate. One end of the pole can be connected to a jelly roll of the battery, and the other end of the pole can be connected to an external electrical device. The support member is connected to the base plate, and the support member and the base plate are fixed relative to each other in the axial direction of the pole, so that the support member is reliably connected to the base plate. The injection-molded connecting member is disposed between a support ring and the pole, and the injection-molded connecting member connects the support ring to the pole, so that the pole and the support ring are fixed relative to each other.

Description

Cover plate assembly and battery

[0001] The present application claims priority to the Chinese patent application No. 202411348219.0, filed on September 25, 2024, and entitled "Cover plate assembly and battery", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, and more particularly, to a cover plate assembly and a battery. BACKGROUND

[0003] As the smallest energy storage unit, the battery cell also provides the power source for tools. The battery cell structure usually includes a cover plate assembly, a shell, an insulating film and other parts. The core of the cover plate assembly is the pole, which is the interface for connecting the battery cell with external power equipment. One end of the pole is connected with the winding core, and the other end of the pole is electrically connected with the external power equipment through the cover plate.

[0004] Currently, when the pole in the cover plate assembly is connected with the base plate, the insulation problem needs to be considered. Therefore, the pole is connected with the cover plate through an insulating part. Although this connection mode ensures electrical safety, the connection reliability of the pole and the cover plate is poor. When the pole is subjected to an axial force, it is easy to loosen and separate from the cover plate. SUMMARY

[0005] The present application aims to provide a cover plate assembly and a battery, which solves the problem of poor connection reliability of the pole and the cover plate of the battery in the related art.

[0006] In a first aspect, the present application provides a cover plate assembly, comprising:

[0007] a base plate;

[0008] a pole, penetrating the base plate;

[0009] a support member, disposed on the base plate, the support member and the base plate being fixed relative to each other in the axial direction of the pole;

[0010] an injection-molded connecting member, disposed between the support member and the pole, connecting the support member and the pole.

[0011] In some embodiments, the pole comprises a first pole body and a second pole body connected with each other, the outer diameter of the second pole body is greater than that of the first pole body, the first pole body penetrates the base plate, and the second pole body is limited and matched with one side plate surface of the base plate in the axial direction of the pole.

[0012] In some embodiments, the substrate is provided with a mounting hole for the first post to pass through, and the mounting hole has a support surface facing the hole opening of the mounting hole, and the support member is arranged on the support surface.

[0013] In some embodiments, the support member is sleeved on the first post, and the inner wall of the support member has a gap with the outer wall of the first post, and at least part of the injection-molded connecting member is filled between the inner wall of the support member and the outer wall of the first post.

[0014] In some embodiments, the side wall of the first post has a limiting groove, the support member is opposite to the side wall of the limiting groove and has a gap, and at least part of the injection-molded connecting member is filled between the support member and the bottom wall of the limiting groove.

[0015] In some embodiments, the limiting groove further has opposite top and bottom walls, the top and bottom walls are both in the axial direction of the post, the support member has a gap with the top and bottom walls, and the injection-molded connecting member is further filled between the support member and the top wall and between the support member and the bottom wall.

[0016] In some embodiments, the support member includes first and second support portions, the first and second support portions are arranged opposite to and spaced from each other, and the first and second support portions are both sleeved on the first post, and the injection-molded connecting member is further filled between the first and second support portions.

[0017] In some embodiments, the cover plate assembly further includes a sealing member, the sealing member is sleeved on the first post, and the sealing member is located between the second post and the substrate.

[0018] In some embodiments, the support member is welded to the substrate.

[0019] In a second aspect, based on the cover plate assembly above, the application provides a battery including the cover plate assembly above.

[0020] The cover plate assembly provided by the application can be applied to a battery, wherein a pole is arranged through the cover plate, one end of the pole can be connected with a winding core of the battery, and the other end of the pole can be connected with an external power consuming device. The support is connected with the base plate, and the support and the base plate are fixed relative to each other in the axial direction of the pole, so that the support and the base plate are reliably connected. The injection-molded connecting piece is arranged between the support ring and the pole, and the injection-molded connecting piece connects the support ring and the pole, so that the pole and the support ring are fixed relative to each other, and when the pole is subjected to a force in the axial direction, the support ring can support the pole in the axial direction of the pole, preventing the pole from moving relative to the cover plate in the axial direction of the pole, and ensuring the stability and reliability of the pole. The injection-molded connecting piece is an insulating piece, and the injection-molded connecting piece arranged between the pole and the support can separate the pole and the support, avoiding the direct contact of the pole, the support and the base plate to prevent short circuit, and improving the electrical safety of the pole.

[0021] The battery provided by the application applies the cover plate assembly, so that the reliability and safety of the connection between the battery and the external power consuming device are high. BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a schematic view of a cover plate assembly according to an embodiment of the application;

[0023] FIG. 2 is a top view of the cover plate assembly according to an embodiment of the application;

[0024] FIG. 3 is a sectional view of A-A in FIG. 2;

[0025] FIG. 4 is a schematic view of a base plate of the cover plate assembly according to an embodiment of the application;

[0026] FIG. 5 is a schematic view of a pole of the cover plate assembly according to an embodiment of the application;

[0027] FIG. 6 is a schematic view of a support of the cover plate assembly according to an embodiment of the application.

[0028] BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION

[0029] The embodiments of the application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation of the application.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] The electric core is the smallest energy storage unit and also provides a power source for the tool. The electric core structural member usually includes a cover plate assembly, a shell, an insulating film and the like. The core of the cover plate assembly is a pole, which is an interface for connecting the electric core with an external power consumption device. One end of the pole is connected with the winding core, and the other end of the pole is arranged in the cover plate and electrically connected with the external power consumption device.

[0032] At present, when the pole in the cover plate assembly is connected with the base plate, the insulation problem needs to be considered, so the pole is connected with the cover plate through an insulating member. Although such a connection mode ensures electrical safety, the connection reliability of the pole and the cover plate is poor. When the pole is subjected to an axial force, the pole is prone to loosen and separate from the cover plate.

[0033] The cover plate assembly provided in the present application can be applied to a battery. The pole is arranged in the cover plate. One end of the pole can be connected with an electrode assembly of the battery, and the other end of the pole can be connected with an external power consumption device. The support member is connected with the base plate, and the support member and the base plate are fixed relative to each other in the axial direction of the pole, so that the support member and the base plate are reliably connected. The injection-molded connecting member is arranged between the support ring and the pole, and the injection-molded connecting member connects the support ring and the pole. In this way, the pole and the support ring are fixed relative to each other. When the pole is subjected to a force in the axial direction thereof, the support ring can support the pole in the axial direction of the pole, so as to prevent the pole from moving along the axial direction of the pole relative to the cover plate, thereby ensuring the stability and reliability of the pole. The injection-molded connecting member is an insulating member. The injection-molded connecting member arranged between the pole and the support member can separate the pole and the support member, so as to prevent the pole and the support member from directly contacting the base plate and causing short circuit, thereby improving the electrical safety of the pole.

[0034] The battery provided in the present application applies the above-mentioned cover plate assembly, so that the connection reliability and safety of the battery and the external power consumption device are high.

[0035] The cover plate assembly and the battery provided in the present application will be described in detail below in combination with specific embodiments.

[0036] The application provides a battery, which comprises a shell, an electrode assembly and a cover plate assembly. The battery can be applied to a car as a power battery or to other power consuming devices, and the application is not limited in this aspect.

[0037] The shell is a basic component of the battery, and can provide a mounting base for other at least partial components of the battery and protect the other at least partial components. The shell can be made of a metal material, so that the shell has better structural strength, and the service life and reliability of the shell are better. The shell has a cavity, which can be used to mount other at least partial components of the battery. The electrode assembly can be arranged in the cavity of the shell, and the cover plate assembly is sealed to the opening of the cavity of the shell. The electrode assembly can be electrically connected with the cover plate assembly.

[0038] The application further provides a cover plate assembly, which can be applied to the battery. As shown in FIGS. 1 to 3, the cover plate assembly comprises a base plate 100, a pole 200, a support 300 and an injection-molded connecting piece 400.

[0039] The base plate 100 is a basic component of the cover plate assembly, and can provide a mounting base for other at least partial components of the cover plate assembly. The base plate 100 can be made of a metal material, so that the base plate 100 has better structural strength, and the service life and reliability of the base plate 100 are better. The base plate 100 can be arranged at the opening of the cavity of the shell and seal the opening of the cavity, so that the electrode assembly in the shell can be enclosed in the cavity of the shell, and the electrode assembly is protected.

[0040] The pole 200 is arranged through the base plate 100, one end of the pole 200 extends into the cavity of the shell and is connected with the electrode assembly, and the other end of the pole 200 extends out of the base plate 100 and is connected with an external electrical connection device, so that the electrode assembly can be connected with the external electrical connection device, and the charging and discharging function is realized.

[0041] The support 300 is arranged on the base plate 100, and the support 300 is relatively fixed with the base plate 100 in the axial direction of the pole column 200, so that the support 300 can remain relatively fixed with the base plate 100 after being subjected to the force in the axial direction of the pole column 200, avoiding displacement of the support 300 relative to the base plate 100. The support 300 and the pole column 200 have a gap therebetween, and the injection-molded connecting piece 400 is arranged between the support 300 and the pole column 200. The injection-molded connecting piece 400 is connected to the pole column 200 and the support 300, so that the pole column 200 is connected and fixed with the support 300 through the injection-molded connecting piece 400. When the pole column 200 is subjected to the force in the axial direction of the pole column 200, the force can be transmitted to the support 300. Since the support 300 is relatively fixed with the base plate 100 in the axial direction of the pole column 200, the support 300 can remain relatively fixed with the base plate 100 after bearing the force in the axial direction of the pole column 200 transmitted by the pole column 200. In this way, the pole column 200 can also remain relatively fixed with the base plate 100, so that the two ends of the pole column 200 can remain in a reliable connection state with the electrode assembly and the external electrical connecting piece.

[0042] The injection-molded connecting piece 400 is an injection-molded part, and accordingly, the injection-molded connecting piece 400 is a plastic part and is made of insulating material. The injection-molded connecting piece 400 is located between the support 300 and the pole column 200, so that the injection-molded connecting piece 400 can separate the support 300 and the pole column 200 to avoid direct contact therebetween. The injection-molded connecting piece 400 is made of insulating material, so that the support 300 and the pole column 200 cannot conduct electricity with each other, thereby preventing short circuit of the battery.

[0043] Specifically, when assembling the cover plate assembly of the application, the support 300 can be first fixedly connected with the base plate 100, so that the support 300 is relatively fixed with the base plate 100 in the thickness direction of the base plate 100, i.e., in the axial direction of the pole column 200. Then, the pole column 200 is arranged through the base plate 100, and the pole column 200 and the support 300 have a gap therebetween, so that the pole column 200 and the support 300 do not directly contact each other. Finally, the injection-molded connecting piece 400 is formed between the pole column 200 and the support 300 through an injection molding process. In this way, the injection-molded connecting piece 400 can be simultaneously connected with the pole column 200 and the support 300, and separate the pole column 200 and the support 300, so as to achieve the purpose of connecting and fixing the pole column 200 and the support 300 without conducting electricity with each other.

[0044] In some embodiments, referring to FIGS. 1-3, the pole 200 of the present application can be provided with a first pole body 210 and a second pole body 220 connected to each other. The first pole body 210 is arranged to pass through the base plate 100, and the second pole body 220 has an outer diameter greater than that of the first pole body 210, so that a stepped surface is formed at the connection between the second pole body 220 and the first pole body 210. The stepped surface between the second pole body 220 and the first pole body 210 is opposite to one side surface of the base plate 100, so that the second pole body 220 is limited in the axial direction of the pole 200 by the one side surface of the base plate 100.

[0045] Specifically, the second pole body 220 is limited in the axial direction of the pole 200 by the one side surface of the base plate 100 facing the cavity of the shell, so that the pole 200 is prevented from being separated from the base plate 100 under the action of a force in a direction away from the cavity of the shell. An insulating pad can be arranged between the second pole body 220 and the one side surface of the base plate 100 to separate the second pole body 220 from the one side surface of the base plate 100, so that the second pole body 220 is prevented from directly contacting the one side surface of the base plate 100 and causing short circuit.

[0046] When assembling the cover plate assembly of the present application, an insulating pad can be arranged on the one side surface of the base plate 100, and then the first pole body 210 is arranged to pass through the base plate 100, and the second pole body 220 is arranged opposite to the one side surface of the base plate 100 and abuts against the insulating pad. In this way, the pole 200 and the base plate 100 can be pre-fixed, so that the injection-molded connecting piece 400 can be formed between the support 300 and the pole 200 by the injection molding process.

[0047] In some embodiments, it should be understood that, referring to FIGS. 3-4, since the pole 200 passes through the base plate 100, the base plate 100 is provided with a mounting hole 110 for the pole 200 to pass through. A support surface 120 facing the opening of the mounting hole 110 is arranged in the mounting hole 110, and the support 300 can be arranged on the support surface 120, so that the support surface 120 can support and fix the support 300. Specifically, the support surface 120 is a stepped surface in the mounting hole 110, and the mounting hole 110 can be provided with a first hole section and a second hole section connected to each other, and the inner diameter of the first hole section is different from that of the second hole section, so that the stepped surface can be supported between the first hole section and the second hole section. By arranging the support 300 on the stepped surface of the mounting hole 110, the support 300 can be located in the mounting hole 110, so that the support 300 can utilize the space in the mounting hole 110 to reduce the space occupied by the support 300 outside the base plate 100, thereby making the structure of the cover plate assembly of the present application relatively more compact.

[0048] Specifically, the support member 300 is also made of metal, so that the support member 300 has better structural strength, so that the support member 300 can better bear the axial force of the pole 200, so that the pole 200 remains stable. When assembling the cover plate assembly of the application, the support member 300 can be placed on the stepped surface in the mounting hole 110, so that the support member 300 can be pre-fixed, and then the support member 300 and the mounting hole 110 are connected by welding, so that the support member 300 and the base plate 100 are reliably connected.

[0049] In addition, the support member 300 and the base plate 100 can also be fixed by screw connection and the like. Specifically, screw holes can be formed on the support surface 120 of the support member 300 and the mounting hole 110, and the support member 300 and the base plate 100 are fixed by screws.

[0050] In some embodiments, as shown in FIG. 3, in order to make the connection effect of the support member 300 and the pole 200 more reliable, the support member 300 can be provided to cover the first column body 210 of the pole 200. Specifically, the support member 300 is a ring-shaped structure, the circumferential inner wall of the support member 300 and the circumferential outer wall of the first column body 210 both have gaps, the injection connection member 400 is distributed along the circumferential outer wall of the first column body 210, so that the injection connection member 400 is located between the circumferential inner wall of the support member 300 and the circumferential outer wall of the first column body 210, and the circumferential outer wall of the support member 300 can be connected with the circumferential outer wall of the pole 200 through the injection connection member 400. In this way, the connection area of the support member 300 and the injection connection member 400 is larger, the connection area of the injection connection member 400 and the pole 200 is also larger, and the connection reliability of the support member 300 and the pole 200 is better.

[0051] In some embodiments, as shown in FIGS. 3 to 5, the side wall 211a of the first column body 210 of the application can be provided with a limiting groove 211, and the direction of the groove of the limiting groove 211 is consistent with the radial direction of the first column body 210. The inner wall of the annular support member 300 and the side wall 211a of the limiting groove 211 have a gap, wherein the side wall 211a of the limiting groove 211 is the inner wall opposite to the groove of the limiting groove 211. In this way, the support member 300 and the first column body 210 can form a gap, so that the injection connection member 400 can be arranged between the support member 300 and the first column body 210 to connect the support member 300 and the first column body 210.

[0052] The limiting groove 211 of the first column body 210 can limit the support member 300, so that the connection reliability of the support member 300 and the first column body 210 in the axial direction of the first column body 210 is better.

[0053] In some embodiments, referring to FIGS. 3-5, the limiting groove 211 of the first column 210 further has opposite top and bottom walls 211b and 211c, the top and bottom walls 211b and 211c of the limiting groove 211 face each other and are in the same direction as the axial direction of the first column 210. Specifically, the top and bottom walls 211b and 211c of the limiting groove 211 are connected to the two sides of the side wall 211a, the support 300 has a gap with the top and bottom walls 211b and 211c of the limiting groove 211, and the injection-molded connecting piece 400 is further filled in the gap between the support 300 and the top wall 211b of the limiting groove 211 and in the gap between the support 300 and the bottom wall 211c of the limiting groove 211. In this way, the injection-molded connecting piece 400 can further fix the support 300 to the top and bottom walls 211b and 211c of the limiting groove 211, thereby further increasing the contact area of the injection-molded connecting piece 400 with the support 300 and the contact area of the injection-molded connecting piece 400 with the pole 200, and the connection stability and reliability of the support 300 with the pole 200 are further improved.

[0054] In some embodiments, referring to FIG. 6, in order to make the assembly process of the cover plate assembly of the application more simple and convenient, the support 300 can be provided with a first support portion 310 and a second support portion 320. The first support portion 310 and the second support portion 320 are arranged opposite to and spaced from each other, and both of them are sleeved on the first column 210. Specifically, the first support portion 310 and the second support portion 320 are both semi-annular structural members, and the central angles of the first support portion 310 and the second support portion 320 are both 180°. In this way, the first support portion 310 and the second support portion 320 have the same structure, and the first support portion 310 and the second support portion 320 do not need to be separately molded, thereby reducing the manufacturing cost of the cover plate assembly of the application.

[0055] The injection-molded connecting piece 400 can also be filled in the gap between the first support portion 310 and the second support portion 320, so that the first support portion 310 and the second support portion 320 can be connected by the injection-molded connecting piece 400. In this way, the first support portion 310 and the second support portion 320 do not need to be separately fixed and connected, thereby further improving the assembly efficiency of the cover plate assembly of the application.

[0056] Specifically, when assembling the cover plate assembly of the present application, the first support part 310 and the second support part 320 can be placed on the support surface 120 of the mounting hole 110, the first support part 310 and the second support part 320 are opposite and have a gap, and then the injection molding connecting part 400 is arranged by the injection molding process, so that the injection molding connecting part 400 is arranged between the first support part 310 and the pole column 200, between the second support part 320 and the pole column 200, and between the first support part 310 and the second support part 320. In this way, the injection molding connecting part 400 can be formed by one injection molding process, and the first connecting part and the second connecting part are connected, which improves the assembly efficiency of the cover plate assembly of the present application and reduces the preparation cost of the cover plate assembly.

[0057] In some embodiments, referring to FIG. 3, the cover plate assembly of the present application can further comprise a sealing part 500, which can be sleeved on the first column body 210 of the pole column 200 and located outside the mounting hole 110 of the base plate 100. The sealing part 500 is also stacked on the end surface of the second column body 220 facing the base plate 100. The sealing part 500 is an insulating part, which can be specifically made of rubber. The sealing part 500 not only can seal the area between the base plate 100 and the pole column 200, but also can separate the second column body 220 and the plate surface of the base plate 100 to avoid short circuit caused by direct contact between the second column body 220 and the base plate 100.

[0058] In some embodiments, referring to FIG. 3, the support part 300 of the present application can further comprise a first support section 330 and a second support section 340 connected together. The first support section 330 and the second support section 340 are both annular, so that the first support section 330 and the second support section 340 can be sleeved on the pole column 200. The outer diameter of the first support section 330 is greater than that of the second support section 340, and the first support section 330 is arranged on the support surface 120 of the mounting hole 110, so that the structure of the support part 300 is relatively more compact.

[0059] In the description of the present specification, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized by The application relates to a polar column structure. The polar column structure comprises a substrate (100), a polar column (200) penetrating through the substrate (100), a support (300) arranged on the substrate (100) and fixed relative to the substrate (100) in the axial direction of the polar column (200), and an injection-molded connecting piece (400) arranged between the support (300) and the polar column (200) and connecting the support (300) and the polar column (200). The polar column (200) comprises a first column body (210) and a second column body (220) connected to each other, the second column body (220) has an outer diameter larger than that of the first column body (210), the first column body (210) penetrates through the substrate (100), and the second column body (220) is limitedly matched with a side plate surface of the substrate (100) in the axial direction of the polar column (200). The substrate (100) is provided with a mounting hole (110) for the first column body (210) to penetrate through, the mounting hole (110) has a support surface (120) facing the hole of the mounting hole (110), and the support (300) is arranged on the support surface (120). The support (300) is sleeved on the first column body (210), the inner wall of the support (300) and the outer wall of the first column body (210) have a gap, and at least part of the injection-molded connecting piece (400) is filled between the inner wall of the support (300) and the outer wall of the first column body (210).

2. The cover plate assembly of claim 1, wherein, The side wall (211a) of the first column body (210) is provided with a limiting groove (211), the support (300) is opposite to the side wall (211a) of the limiting groove (211) and has a gap, and at least part of the injection-molded connecting piece (400) is filled between the support (300) and the bottom wall (211c) of the limiting groove (211).

3. The cover plate assembly of claim 2, wherein, The limiting groove (211) further comprises opposite top and bottom walls (211b) and (211c), the top and bottom walls (211b) and (211c) are both in the axial direction of the polar column (200), the support (300) has a gap with the top and bottom walls (211b) and (211c), and the injection-molded connecting piece (400) is further filled between the support (300) and the top wall (211b) and between the support (300) and the bottom wall (211c). The support (300) comprises first and second support portions (310) and (320), the first and second support portions (310) and (320) are arranged opposite to and spaced from each other, and both the first and second support portions (310) and (320) are sleeved on the first column body (210), and the injection-molded connecting piece (400) is further filled between the first and second support portions (310) and (320).

4. The cover plate assembly of claim 2, wherein, ​ 5. The cover plate assembly of claim 3, wherein, ​ 6. The cover plate assembly of claim 5, wherein, ​ 7. The cover plate assembly of claim 4, wherein, ​ 8. The cover plate assembly of claim 2, wherein, The cover plate assembly further comprises a sealing member (500) sleeved on the first column (210), and located between the second column (220) and the base plate (100).

9. The cover plate assembly of any one of claims 1-8, wherein, The support member (300) is welded to the base plate (100).

10. A battery, characterized by A cover plate assembly comprising any one of claims 1-9.

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