Battery cover plate, battery and electric device

Abstract

The utility model relates to battery technical field discloses a kind of battery cover plate, battery and electric equipment.Battery cover plate includes cover plate main body, pole and plastic part, cover plate main body is formed with pole hole and annular groove around the outer periphery of pole hole, pole extends through pole hole, plastic part is set to at least fill annular space between pole and pole hole, so that pole is insulatedly sealed fixed to cover plate main body in the position of through pole hole, plastic part has inverted buckle structure embedded into annular groove.By setting the annular groove of inverted buckle structure of plastic part on cover plate main body, reliable limit cooperation between plastic part and cover plate main body is realized, so that effectively prevent plastic part from axial displacement or looseness in injection molding or use process, improve assembly accuracy and sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cover, a battery including the battery cover, and an electrical device including the battery. Background Technology

[0002] With the development of lithium-ion batteries and energy storage batteries, battery covers, as key packaging components, are typically used to seal the cells, provide electrical leads to the terminals, and isolate the battery from gas and liquid.

[0003] In the prior art, battery covers generally include terminals, cover body, and plastic parts for isolation and sealing. The plastic parts are mostly directly combined with terminals and cover through injection molding process.

[0004] In practical applications, due to the influence of factors such as flowability, shrinkage rate, and molding stress on the injection molding process, plastic parts may experience problems such as unstable positioning, local warping, or axial displacement during injection molding or subsequent assembly, affecting the assembly accuracy and sealing reliability of the cover plate. In addition, during long-term cyclic use, plastic parts are also prone to loosening or displacement due to thermal stress and mechanical vibration, which can lead to electrolyte leakage or a decline in electrical performance. Utility Model Content

[0005] The purpose of this invention is to solve the problem that plastic parts are prone to axial displacement or loosening after injection molding in the prior art.

[0006] To achieve the above objectives, the first aspect of this utility model provides a battery cover plate, which includes a cover plate body, a terminal post, and a plastic part. The cover plate body has a terminal post hole and an annular groove surrounding the outer periphery of the terminal post hole. The terminal post extends through the terminal post hole. The plastic part is configured to at least fill the annular space between the terminal post and the terminal post hole, so that the terminal post is insulatedly and sealed to the cover plate body at the position where it passes through the terminal post hole. The plastic part has an inverted buckle structure that is embedded in the annular groove.

[0007] Optionally, the opening width of the annular groove is smaller than the bottom width of the groove.

[0008] Optionally, the sidewall of the annular groove is provided with an outward protrusion that mates with the undercut structure, and the outward protrusion is embedded in the undercut structure.

[0009] Optionally, the cover plate body has a plate body and a rivet block that protrudes outward from the plate body and forms a pole hole at the top end, and an annular groove is formed on the plate body and is adjacent to the root of the rivet block connected to the plate body.

[0010] Optionally, the rivet block has a columnar portion extending outward from the plate body and a limiting portion disposed at the inner edge of the top of the columnar portion and defining the pole hole; the pole includes a pole body extending through the pole hole and a pole flange located at least partially between the limiting portion and the plate body; the plastic part is configured to completely cover the outer peripheral surface of the columnar portion and the limiting portion.

[0011] Optionally, the battery cover also includes a sealing ring disposed in the space surrounding the columnar portion, through which the terminal flange is sealed and supported on the plate body.

[0012] Optionally, the plastic component is configured to connect the rivet block, pole, and sealing ring into one unit.

[0013] Optionally, an inner insulating element that snaps onto the inner surface of the plate body is provided.

[0014] A second aspect of this utility model provides a battery, which includes a housing and the aforementioned battery cover disposed on the housing.

[0015] The third aspect of this utility model provides an electrical device that includes the aforementioned battery.

[0016] By setting an annular groove on the cover plate body that can fit the plastic part with an inverted structure, a reliable limiting fit between the plastic part and the cover plate body is achieved, thereby effectively preventing axial displacement or loosening of the plastic part during injection molding or use, and improving assembly accuracy and sealing reliability. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the battery cover plate of this utility model;

[0018] Figure 2 This is a partial enlarged view of the battery cover of this utility model;

[0019] Figure 3 This is a partial enlarged view of the battery cover of this utility model;

[0020] Figure 4 This is a top view of the battery cover of this utility model.

[0021] Explanation of reference numerals in the attached figures Detailed Implementation

[0022] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this utility model by way of example, but should not be used to limit the scope of this utility model. This utility model can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0023] These embodiments are provided to make the present invention thorough and complete, and to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0024] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Furthermore, the terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well.

[0026] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0028] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0029] like Figures 1 to 4As shown, the first aspect of this utility model provides a battery cover plate, which includes a cover plate body 1, a terminal post 3, and a plastic part 2. The cover plate body 1 has a terminal post hole and an annular groove surrounding the outer periphery of the terminal post hole. The terminal post 3 extends through the terminal post hole. The plastic part 2 is configured to at least fill the annular space between the terminal post 3 and the terminal post hole, so that the terminal post 3 is insulatedly and sealed to the cover plate body 1 at the position where it passes through the terminal post hole. The plastic part 2 has an inverted buckle structure 21 that is embedded in the annular groove.

[0030] Specifically, such as Figure 1 and Figure 4 As shown, the cover plate body 1 can be a plate-like structure, with electrode holes provided at the corresponding positions of the electrode posts 3 for inserting the positive or negative electrode posts. The electrode posts 3 can be made of a metal material with good electrical conductivity, such as aluminum, copper, nickel, or their alloys. An annular groove is formed around the electrode hole, and its cross-section is an annular groove, used to accommodate part of the structure of the plastic part 2 during injection molding.

[0031] To achieve insulation and sealing of the electrode post 3 at the electrode post hole and reliable fixation between the plastic part 2 and the annular groove, after the electrode post 3 is inserted into the electrode post hole, an insulating plastic material in a flowing state, used to form the plastic part 2, can be injected into the electrode post hole and its surrounding gaps through injection molding. After the plastic material cures, it fills the annular space between the electrode post 3 and the electrode post hole, forming an inverted structure 21 within the annular groove. This inverted structure 21 cooperates with the inner wall and bottom of the annular groove, limiting and constraining the plastic part 2 on the cover plate body 1, thereby maintaining stability during use.

[0032] Optionally, the opening width of the annular groove is smaller than the bottom width of the groove.

[0033] To achieve a reliable limiting fit after the plastic part 2 is injected and cured, the annular groove can have a structure that narrows radially. Specifically, such as Figure 2 and Figure 3 As shown, the cross-section of the annular groove can be set to a shape where the opening width is smaller than the bottom width, so that the groove presents a certain inverted trapezoidal or flared profile. In this way, when the insulating plastic material used to form the plastic part 2 is injected and cured, the inverted structure 21 formed by the plastic part 2 in the groove can effectively restrict the displacement or detachment of the plastic part 2 in the axial direction through the interlocking action with the groove opening.

[0034] Optionally, the sidewall of the annular groove is provided with an outward protrusion 111 that cooperates with the inverted structure 21, and the outward protrusion 111 is embedded in the inverted structure 21.

[0035] Specifically, such as Figure 3As shown, the sidewall of the annular groove can be provided with an outward protrusion 111 or an inward concave portion (not shown in the figure) for cooperating with the undercut structure 21. Such a structural arrangement can effectively position the plastic part 2 in the radial direction without using the annular groove narrowing structure. Through the geometric interference fit (i.e., shape interlocking) formed by the outward protrusion or inward concave portion in the radial direction, the plastic part 2 is constrained after curing, thereby preventing loosening or falling off during use.

[0036] Preferably, the annular groove employs a structure where the opening width is smaller than the groove bottom width, and also features either an outwardly protruding portion or an inwardly recessed portion on its sidewalls. These two elements work together to enhance the limiting effect. Furthermore, the outwardly protruding portion 111 or the inwardly recessed portion can be formed on two opposite sidewalls of the annular groove, or distributed circumferentially as several raised points or recessed areas to achieve different ranges or degrees of limiting as needed. The specific choice can be reasonably determined based on actual working conditions and mold conditions.

[0037] Optionally, the cover plate body 1 has a plate body 11 and a rivet block 12 that protrudes outward from the plate body 11 and forms a pole hole at the top end. An annular groove is formed on the plate body 11 and is adjacent to the root of the rivet block 12 connected to the plate body 11.

[0038] To further improve the installation strength and positioning accuracy of the pole, the cover plate body 1 may include a plate body 11 and a riveting block 12 integrally formed therewith. Specifically, the riveting block 12 protrudes outward from the surface of the plate body 11, and its top end forms a pole hole for installing the pole 3. The annular groove is preferably provided on the outer surface of the plate body 11 and is located in the region adjacent to the root where the riveting block 12 connects to the plate body 11.

[0039] The rivet block 12 not only provides geometric support for the electrode post hole, but also, through its protruding three-dimensional structure, forms a reliable coating interface during the injection molding of the plastic part 2. This helps to enhance the curing coating strength of the plastic part 2 and improve the fixing stability of the electrode post 3 on the cover plate body 1. In addition, the rivet block 12 also provides better insulation clearance.

[0040] Optionally, the rivet block 12 has a columnar portion 121 extending outward from the plate body 11 and a limiting portion 122 disposed on the inner edge of the top of the columnar portion 121 and defining the pole hole; the pole 3 includes a pole body extending through the pole hole and a pole flange 32 located at least partially between the limiting portion 122 and the plate body 11; the plastic part 2 is configured to completely cover the outer peripheral surface of the columnar portion 121 and the limiting portion 122.

[0041] Specifically, such as Figure 2As shown, the riveting block 12 may include a columnar portion 121 extending outward from the plate body 11, and a limiting portion 122 formed at the top of the columnar portion 121 by a riveting process during the assembly process, which is used to limit the size and shape of the pole hole.

[0042] The process of installing the pole post into the cover plate body 1: Before the pole post 3 is installed, the top of the columnar part 121 is in a pre-formed state, only forming a through hole, which facilitates the pole post body of the pole post 3 to be inserted from above into the predetermined position, and ensures that at least part of the pole post flange 32 can be located between the columnar part 121 and the plate body 11. After the pole post 3 is inserted and positioned, the top of the columnar part 121 is riveted or stamped to deform the material radially inward, forming a limiting part 122, thereby forming a shielding area above the pole post flange 32, effectively preventing the pole post 3 from falling out of the pole post hole along the installation direction, and ensuring axial limiting. At the same time, the process of inserting first and then riveting avoids direct physical interference between the pole post flange 32 and the pole post hole, improves the convenience of assembly operation and process adaptability, and enhances the process adaptability and assembly reliability of the aforementioned related components under complex working conditions such as high temperature and vibration.

[0043] Preferably, the plastic part 2 is configured to completely cover the outer peripheral surface of the columnar part 121 and the limiting part 122 after riveting, thereby forming a continuous and complete insulating and sealing interface between the three-dimensional support area and the pole body and the pole flange 32, improving the sealing reliability.

[0044] The above-mentioned configuration of columnar part 121 and limiting part 122 is a concrete manifestation of the three-dimensional structure and three-dimensional support effect of the aforementioned riveting block 12. It can provide multiple positioning in the circumferential and axial directions after the plastic part 2 is cured, and form a reliable physical limiting area above the pole flange 32, further enhancing the installation stability and sealing effect of the pole 3 on the cover plate body 1.

[0045] As mentioned above, the rivet block 12 provides multiple positioning for the plastic part 2 in both the circumferential and axial directions. This not only ensures the stability of the plastic part 2 after curing, preventing relative displacement, but also promotes close contact between it and the outer circumferential surface of the pole post 3, generating a certain frictional resistance. This frictional resistance provides effective circumferential damping when the pole post 3 is subjected to rotational loads, limiting its rotation or oscillation, thereby improving the overall anti-rotation performance.

[0046] To further improve the anti-rotation effect, the outer peripheral surface of the pole post 3 may be provided with an anti-rotation structure, such as micro bosses, steps, keyways or roughened areas distributed along the circumferential direction. When the plastic part 2 is cured, it forms mechanical engagement with the pole post 3 or increases friction, thereby forming a stronger torque constraint in the circumferential direction and effectively preventing the pole post 3 from sliding or loosening when subjected to rotational torque.

[0047] Optionally, the battery cover also includes a sealing ring 4 disposed in the space surrounding the columnar portion 121, and the terminal flange 32 is sealed and supported on the plate body 11 by the sealing ring 4.

[0048] Specifically, such as Figure 2 As shown, the sealing ring 4 is preferably an annular structure made of elastic material, and its cross-sectional shape and size match the inner cavity of the columnar portion 121 and the outer peripheral surface of the pole flange 32. Structurally, the sealing ring 4 includes an annular base portion for supporting and bearing the pole flange 32, forming a compression sealing interface along the axial direction to prevent water vapor or electrolyte from axially penetrating along the pole hole. Furthermore, the sealing ring 4 also includes a sealing flange extending along the axial direction and located in the circumferential region of the outer periphery of the pole flange 32. This sealing flange can fill the gap between the outer peripheral surface of the pole flange 32 and the inner wall of the columnar portion 121, forming an additional radial sealing interface, thereby achieving multiple seals in both the axial and radial directions, improving the overall sealing reliability and durability. It is worth mentioning that the axial sealing portion of the sealing ring 4 can also provide flexible support and buffering for the pole flange 32, reducing the risk of loosening or cracking under external load impact or thermal expansion and contraction.

[0049] Optionally, the plastic part 2 is configured to connect the rivet block 12, the pole post 3 and the sealing ring 4 into one piece.

[0050] Specifically, during assembly, a sealing ring 4 is first pre-placed at the bottom of the inner cavity of the columnar portion 121, so that its annular base portion is supported on the plate body 11 and serves as a supporting sealing base surface for the pole flange 32 in the axial direction. Then, the pole 3 is inserted into the through hole of the columnar portion 121 from above until the pole flange 32 presses against the base portion of the sealing ring 4 and is positioned in a predetermined position. Next, the top of the columnar portion 121 is deformed by riveting or stamping to form a limiting portion 122 radially inward, covering the pole flange 32 and achieving axial limiting of the pole 3. Finally, the plastic part 2 is injection molded into the area between the riveting block 12 and the pole 3, as well as the outer area of ​​the riveting block 12, so that it is tightly bonded to the outer surfaces of the riveting block 12, the pole 3, and the sealing ring 4. After curing, a continuous sealing layer and insulating covering structure are formed, thereby improving protection and support performance in both the axial and radial directions.

[0051] Optionally, an inner insulating member 5 is provided on the inner surface of the plate body 11, which is snapped onto the plate body 11.

[0052] Specifically, the inner insulation component 5 is preferably a plate-shaped or shell structure made of high-temperature resistant insulating material (such as polyimide, PPS, or modified polyester), whose shape is adapted to the inner surface of the plate body 11, and is fixedly installed on the lower side of the plate body 11 by means of a snap-fit, limiting step, or positioning post. This inner insulation component 5 forms an additional insulating and buffer layer between the terminal post 3 and the cover plate body 1, thereby further improving the overall electrical insulation performance and preventing leakage or short circuit risks between the battery's internal terminal post and the outer casing. Simultaneously, the inner insulation component 5 also provides auxiliary support for the terminal post flange 32 and the sealing ring 4 in the assembled state, preventing them from loosening, shifting, or being damaged under transportation or vibration and impact conditions, thus improving the installation stability and sealing reliability of the battery cover plate.

[0053] The second aspect of this utility model provides a battery, which includes a housing and the aforementioned battery cover disposed on the housing.

[0054] The third aspect of this utility model provides an electrical device that includes the aforementioned battery. In this utility model, the electrical device can be used in vehicles, ships, aircraft, energy storage devices, electronic products, power tools, etc.

[0055] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A battery cover, characterized in that, The device includes a cover plate body (1), an electrode post (3), and a plastic part (2). The cover plate body (1) has an electrode post hole and an annular groove surrounding the outer periphery of the electrode post hole. The electrode post (3) extends through the electrode post hole. The plastic part (2) is configured to at least fill the annular space between the electrode post (3) and the electrode post hole, so that the electrode post (3) is insulatedly and sealed to the cover plate body (1) at the position where it passes through the electrode post hole. The plastic part (2) has an undercut structure (21) that is embedded in the annular groove.

2. The battery cover according to claim 1, characterized in that, The opening width of the annular groove is smaller than the bottom width of the groove.

3. The battery cover according to claim 1 or 2, characterized in that, The sidewall of the annular groove is provided with an external protrusion (111) that cooperates with the undercut structure (21), and the external protrusion (111) is embedded in the undercut structure (21).

4. The battery cover according to claim 1, characterized in that, The cover plate body (1) has a plate body (11) and a rivet block (12) that protrudes outward from the plate body (11) and forms the pole hole at the top end. The annular groove is formed on the plate body (11) and is adjacent to the root of the rivet block (12) connected to the plate body (11).

5. The battery cover according to claim 4, characterized in that, The rivet block (12) has a columnar portion (121) extending outward from the plate body (11) and a limiting portion (122) disposed on the inner edge of the top of the columnar portion (121) and defining the pole hole; the pole (3) includes a pole body extending through the pole hole and a pole flange (32) located at least partially between the limiting portion (122) and the plate body (11); the plastic part (2) is configured to completely cover the outer peripheral surface of the columnar portion (121) and the limiting portion (122).

6. The battery cover according to claim 5, characterized in that, The battery cover also includes a sealing ring (4) disposed in the space surrounding the columnar portion (121), and the pole flange (32) is sealed and supported on the plate body (11) by the sealing ring (4).

7. The battery cover according to claim 6, characterized in that, The plastic part (2) is configured to connect the rivet block (12), the pole (3) and the sealing ring (4) into one unit.

8. The battery cover according to claim 4, characterized in that, The inner surface of the plate body (11) is provided with an inner insulating member (5) that is snapped onto the plate body (11).

9. A battery, characterized in that, It includes a housing and a battery cover disposed on the housing, wherein the battery cover is the battery cover according to any one of claims 1-8.

10. An electrical appliance, characterized in that, The electrical device includes the battery as described in claim 9.

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