Battery cover plate with lever type supporting structure

Abstract

The invention discloses a battery cover plate with a lever type supporting structure. The battery cover plate comprises a cover plate body, a through hole formed in the cover plate body, a mounting groove formed in the through hole and used for mounting a pole body, and an extension wall extending outwards along the groove wall of the mounting groove; the extending wall is folded outwards to form a folding part; the pole body comprises a first pole body and a second pole body which are arranged in a stepped manner, and an inverted buckle groove is formed in the stepped surface of the second pole body; the plastic body comprises a first injection molding part and a second injection molding part; the position of the upper surface of the first injection molding part is lower than the groove bottom surface of the inverted buckle groove, or the position of the upper surface of the first injection molding part is lower than the step surface and higher than the groove bottom surface of the inverted buckle groove; the second injection molding part is formed by injection molding along the extending wall and the folding part; the battery cover plate provided by the invention solves the problems that the existing battery cover plate is not enough in riveting size precision due to the fact that the injection molding pressure is difficult to control and the tooth grooves are fully injected, and the battery cover plate cannot be effectively sealed in a variable pressure state in the subsequent use process and is insufficient in reliability and stability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of lithium battery production, and particularly relates to a battery cover plate with a lever type supporting structure. BACKGROUND

[0002] It is known that lithium ion power batteries are widely applied in the automobile field due to high energy density, high power density, a large number of cycle times and long storage time; among them, the top cover of the market applied power battery generally comprises a top cover sheet, a pole, a sealing element and an injection molding element, a hole position for the positive and negative poles is arranged on the top cover sheet, the sealing element is used for sealing between the top cover sheet and the pole, and the positive and negative poles are positioned on the top cover sheet through the injection molding element after being penetrated, so as to prevent the two poles from being pulled out when the battery shell is deformed or the internal pressure is increased.

[0003] For example, CN223297016U discloses a pole and a battery cover plate with a sealing ring positive installation structure, the pole comprises an integrally formed columnar body and a hanging disc, one end of the columnar body penetrates through a through hole on the top cover sheet, the other end and the hanging disc are connected to form a flange for sleeving a sealing ring, and the axial height of the flange is smaller than the thickness of the sealing ring; the outer circumferential surface of the columnar body further forms an inwardly recessed undercut portion and a guide portion, the undercut portion is used for embedding plastic to limit the pole from falling off the top cover sheet; the guide portion is arranged between the flange and the undercut portion and is used for guiding the sealing ring to enter the flange; the outer diameter of the hanging disc is greater than the diameter of the through hole of the top cover sheet, and the upper surface of the hanging disc is pressed against the sealing ring in cooperation with the lower surface of the top cover sheet; the pole and the battery cover plate provided by the new type solve the problems that the existing pole structure is easy to jam the sealing ring, the sealing ring cannot be installed in a positive direction, and the sealing ring cannot achieve good sealing effect.

[0004] For another example, CN219497951U discloses a pole assembly, a battery cover plate and a battery, the pole assembly comprises a pole and an adapter row, the pole comprises a pole body and a first convex ring, the pole body is coaxial with the first convex ring and connected with the first convex ring, an edge of the first convex ring is provided with a folded edge, the folded edge extends in a direction away from the axis of the first convex ring, the adapter row is sleeved on the first convex ring, and the adapter row is riveted and connected with the folded edge, so that the reliability and stability of the connection between the adapter row and the pole are greatly improved, the probability of the adapter row falling off is reduced, and the influence of the thickness of the adapter row on the reliability of the connection between the adapter row and the pole is eliminated.

[0005] Although the above method achieves sealed assembly, it still has some shortcomings: (1) The existing electrode core generally has at least two layers of toothed grooves on its outer periphery for fusion connection with the injection molded body, that is, the injection molded part is injected into the toothed groove. This method requires the overall volume and height of the electrode core to be large, which is costly and cannot be miniaturized; more importantly, there are more processing steps, and tooth pressing is required, which can easily affect the conductivity of the entire electrode core, that is, affect the service life of the electrode core; (2) The injection pressure needs to be very large, otherwise it is easy to not fill the toothed groove. If the injection pressure is large (3) The injection molded parts fitted on the outer periphery of the positive and negative poles are directly connected to the sealing ring. When the injection molded parts are subjected to high temperature and high pressure injection molding, the sealing ring will age and fatigue. In addition, the high pressure will deform the poles and generate stress, which will reduce the overall strength and sealing performance of the cover plate. (4) The existing riveting method only plays the role of preventing detachment. It is difficult to truly play the role of bearing pressure. It also hinders the smooth filling of the grooves opened on the outer periphery of the poles by the injection molded parts.

[0006] In summary, the existing battery cover structure needs further improvement. Summary of the Invention

[0007] The purpose of this invention is to overcome the aforementioned defects or problems in the prior art and provide a battery cover with a lever-type support structure. This cover is simple in structure, easy to manufacture, easy to implement, and low in cost. It solves the problems of existing battery covers, such as difficulty in controlling the injection pressure to fill the grooves, insufficient accuracy of riveting dimensions, and inability to effectively seal under changing pressure during subsequent use, resulting in insufficient reliability and stability.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A battery cover with a lever-type support structure, the battery cover comprising a cover body, a sealing element, an electrode post, and a plastic body;

[0010] The cover plate body has a through hole, an installation groove for mounting the pole piece at the through hole, and an extension wall extending outward along the groove wall; the extension wall is folded outward to form a folded part;

[0011] The pole piece includes a first pole piece and a second pole piece arranged in a stepped manner, wherein the outer diameter of the second pole piece is larger than the outer diameter of the first pole piece; the pole piece is placed in a mounting groove, wherein the outer diameter of the second pole piece is smaller than the inner diameter of the mounting groove; an undercut groove is provided on the stepped surface of the second pole piece;

[0012] A sealing element is installed in the mounting groove and is located between the pole body and the bottom of the mounting groove;

[0013] A plastic body, comprising a first injection molded part and a second injection molded part;

[0014] The first injection molded part is injection molded along the outer periphery of the second column. The position of the upper surface of the first injection molded part is lower than the bottom surface of the undercut groove, or the position of the upper surface of the first injection molded part is lower than the stepped surface and higher than the bottom surface of the undercut groove.

[0015] The second injection molded part is injection molded along the extension wall and the folded part, and is connected with the first injection molded part to form an integral structure, so that the second injection molded part covers the outer periphery of the pole post, the stepped surface and the outer surface of the cover plate body.

[0016] The second injection molded part is connected to the first injection molded part as a whole, and forms a lever structure with the folded part as the fulcrum. It is supported by the outer surface of the cover plate body to restrict the pole body from coming out.

[0017] Furthermore, the undercut grooves on the stepped surface are arranged at intervals, and the outer periphery of the undercut grooves extends to the outer periphery of the second column to form an open undercut groove, so that the second injection molded part enters the undercut groove from the end face and the peripheral face of the second column.

[0018] Furthermore, the upper surface of the first injection molded part is located within the range formed by the bottom surface of the undercut groove to the position of 1 / 3 of the height of the stepped surface.

[0019] Furthermore, the extended wall is provided with several connecting grooves, which connect the mounting groove and the outer periphery of the folded part to accommodate the second injection molded part.

[0020] Furthermore, the folded portion includes an upper surface, an outer peripheral surface, and a lower surface; the lower surface has an inner groove; the inner groove is inserted when the second injection molded part is injected, and is used to restrict the second injection molded part from coming out.

[0021] Furthermore, the bottom of the stepped surface or the inverted groove is lower than the lower surface of the folded portion.

[0022] Furthermore, the distance between the outer peripheral wall of the first column and the wall of the mounting groove is less than the distance between the outer peripheral wall of the second injection molded part and the outer peripheral surface of the folded part.

[0023] Furthermore, the lower surface of the first injection molded part is lower than the lower surface of the second electrode; the first injection molded part and the second electrode jointly press the sealing element, and the area of ​​the second electrode pressing against the sealing element is greater than the area of ​​the first injection molded part pressing against the sealing element.

[0024] Furthermore, the inner diameter of the seal is greater than the inner diameter of the through hole, and the outer diameter of the seal is greater than the outer diameter of the pole piece and less than or equal to the outer diameter of the first injection molded part.

[0025] Furthermore, the inner wall diameter of the portion of the folded part that forms the mounting groove is smaller than the diameter of the portion of the mounting groove near the bottom of the groove.

[0026] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0027] The battery cover plate described in this invention exhibits superior performance in terms of sealing assembly stability, cost, miniaturization, conductivity, injection pressure control, sealing performance, and pressure resistance. Specifically, the battery cover plate utilizes a unique lever-type support structure design, integrating the second injection molded part with the first injection molded part, and forming a lever structure with the folded portion as a fulcrum. Supported by the outer surface of the cover plate body, this effectively prevents the terminal post from detaching outwards. This structure not only avoids the need for multiple layers of grooves on the outer circumference of the terminal post, thus reducing the overall volume and height of the terminal post and lowering costs, but also simplifies the manufacturing process, reduces processing steps, and improves the conductivity and service life of the terminal post. Simultaneously, this design reduces the injection pressure requirements, avoiding the problem of the riveted part bursting due to high injection pressure, as well as the aging and fatigue effects of the injection molded part on the sealing ring, improving the overall strength and sealing performance of the cover plate. Furthermore, the lever-type support structure truly provides pressure resistance, ensuring that the injection molded part can smoothly fill the outer circumference of the terminal post, improving the overall quality and reliability of the product.

[0028] Specifically as follows:

[0029] (1) The electrode of the present invention does not need to be processed multiple times through a complex turning process to form a toothed groove. The undercut groove can be formed by stamping. No processing is required on the conductive main part (i.e., the first column). Therefore, the conductivity will not be affected by deformation or thermal reaction due to multiple processing. This simplifies the structure, reduces the process difficulty, and reduces the cost. Secondly, the size is more precise and thinner, which makes the electrode thinner and lighter, saving costs while improving the conductivity. Of course, the reduction of toothed groove processing is one aspect. More importantly, there is no complex toothed groove that needs to be filled in the injection molding, and there is no complex and narrow space that hinders the flow of molten plastic. Therefore, there is no need for excessive injection pressure, and there is no situation of incomplete filling and impact on the sealing element (the present invention also uses the first injection molded part to further prevent the second injection molded part from impacting the sealing element when it is injected), which plays a dual protection role.

[0030] (2) Based on the first column with a smooth, groove-free outer wall, it is combined with the outwardly folded extension wall and the first and second injection molded parts for injection molding connection. This breaks away from the existing method of press-fitting and preventing detachment through riveting. It not only eliminates the need to consider the accuracy of riveting dimensions, complex subsequent dimensional inspection processes, and the deformation force of springback after riveting, but also utilizes the lever principle with the folded part as the fulcrum and the second injection molded part as the lever arm to restrict the outward movement of the electrode column. That is, when the internal temperature or deformation of the battery casing generates a certain pressure (this pressure is insufficient to cause the explosion-proof valve to burst), This pressure will continuously push the terminal post outward. At this time, the part of the second injection molded part that mates with the stepped surface of the terminal post is also subjected to an outward pushing force. The second injection molded part uses the folded part as a fulcrum, so that the other end of the second injection molded part is subjected to a reverse (i.e., inward) pushing force. Since the other end abuts against the cover plate body, the terminal post is difficult to move outward under the action of lever support, so it is not easy to reduce the compression of the seal, ensuring the reliability and stability of the seal; effectively preventing the deformation and stress generation of the terminal post under pressure, thereby improving the overall strength and service life of the battery cover plate.

[0031] (3) In this invention, the upper surface of the first injection molded part is positioned lower than the bottom surface of the undercut groove, or the upper surface of the first injection molded part is positioned lower than the stepped surface but higher than the bottom surface of the undercut groove. This design not only enables the second injection molded part to quickly fuse and connect with the first injection molded part, but also allows for faster filling of the undercut groove. Furthermore, the open undercut groove design effectively expands the connection area between the second and first injection molded parts, enhancing the overall strength of the structure. Simultaneously, this design also allows the second injection molded part to more smoothly enter the undercut groove from the end face and circumference of the second column, further improving the connection efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Fig. 1 This is a three-dimensional exploded view of the battery cover plate described in this invention;

[0034] Fig. 2 This is a three-dimensional structural diagram of the battery cover plate described in this invention;

[0035] Fig. 3 This is the three-dimensional structure of the pole piece described in this invention;

[0036] Fig. 4 This is a cross-sectional view of the battery cover plate described in this invention;

[0037] Fig. 5This is a three-dimensional sectional view of the cover plate body described in this invention.

[0038] Fig. 6 This is a schematic diagram of the force state of the pole body and the lever support described in this invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0041] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to 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 limiting the specific scope of protection of this invention.

[0042] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0043] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0044] See Figs. 1-3 and Fig. 5 This embodiment describes a battery cover with a lever-type support structure, used for lithium battery encapsulation to ensure the battery's sealing and safety during use. This battery cover, through its unique lever-type support structure, achieves simplified structure, reduced manufacturing difficulty, and improved structural stability.

[0045] The battery cover includes a cover body 1, a sealing element 2, an electrode post 3, and a plastic body 4;

[0046] The cover plate body 1 is made of aluminum and is flat in shape. The cover plate body 1 has a through hole 11, a mounting groove 12 for mounting the pole piece 3 at the through hole 11, and an extension wall 14 extending outward along the wall of the mounting groove 12. The extension wall 14 folds outward to form a folded portion 15. Furthermore, the extension wall 14 has several connecting grooves 140 that connect the mounting groove 12 and the outer periphery of the folded portion 15. The folded portion 15 includes an upper surface A, an outer peripheral surface B, and a lower surface C, with the lower surface C having an inner groove. Part C1, the inner groove part C1 is used to insert when the second injection molded part 42 is injected, so as to restrict the second injection molded part 42 from coming out; the inner wall diameter of the part of the folded part 15 that corresponds to the mounting groove 12 is smaller than the diameter of the part of the mounting groove 12 near the bottom 121 of the groove. In this embodiment, the part of the folded part 15 that corresponds to the mounting groove 12 refers to the vertical part 150 that forms the mounting groove 12, which can be set to be tilted inward at a certain angle, such as 1-3°, so as not to affect the injection molding of the second injection molded part, and to prevent it from falling out during the transfer process before secondary injection molding;

[0047] In this embodiment, a plurality of connecting grooves 140 are also provided at the extension wall 14. The connecting grooves 140 connect the mounting groove 12 and the outer periphery of the folded part 15 to accommodate the second injection molded part 42. This not only makes it easier to injection mold, but also makes the connection strength better and makes it easier to form a lever fulcrum with this part.

[0048] The electrode post 3 is generally made of copper and copper-aluminum composite materials. In this invention, copper-aluminum composite material is used to prepare the negative electrode post, and copper material is used as the positive electrode post. The electrode post 3 in this embodiment includes a first post 31 and a second post 32 arranged in a stepped manner. The stepped thin posts have a small overall height, which allows for further miniaturization. The outer diameter of the second post 32 is larger than the outer diameter of the first post 31. The electrode post 3 is placed in the mounting groove 12, and the outer diameter of the second post 32 is smaller than the inner diameter of the mounting groove 12.

[0049] Furthermore, undercut grooves 322 are provided on the stepped surface H of the second column 32. This embodiment uses 3-4 undercut grooves 322 as an example. The forming is done by stamping in one step without the need for secondary processing such as turning. In this embodiment, the undercut grooves 322 are arranged at intervals on the stepped surface H, and the outer periphery of the undercut grooves 322 extends to the outer periphery of the second column 32 to form an open undercut groove 322, so that the second injection molded part 42 enters the undercut groove 322 from the end face and the peripheral face of the second column 32, and the second injection molded part 42 is easier to fill when it is injected.

[0050] The sealing element 2 is installed in the mounting groove 12 and is located between the pole body 3 and the bottom of the mounting groove 12;

[0051] Plastic body 4, which includes a first injection molded part 41 and a second injection molded part 42;

[0052] The first injection molded part 41 is injection molded along the outer periphery of the second column 32 and is used to wrap the outer periphery of the second column 32. In this embodiment, the position of the upper surface L of the first injection molded part 41 is lower than the bottom surface W of the undercut groove 322, or the position of the upper surface L of the first injection molded part 41 is lower than the stepped surface H and higher than the bottom surface W of the undercut groove 322. Preferably, the upper surface L of the first injection molded part 41 is located within the range extending upward from the bottom surface W of the undercut groove 322 to 1 / 3 of the overall height of the undercut groove 322. With this setting, firstly, the high temperature of the second injection molded part 42 during secondary injection is effectively prevented from directly contacting the seal 2, thus reducing the service life of the seal 2. Secondly, the setting position of the upper surface L of the first injection molded part 41 can not only improve the effect of rapid filling, but also does not affect the small volume of the second injection molded part 42 in the undercut groove 322, thus playing a good connecting role and having better stability.

[0053] The second injection molded part 42 is injection molded along the extension wall 14 and the folded part 15, and is connected to the first injection molded part 41 to form an integral structure, so that the second injection molded part 42 covers the outer periphery of the pole post 3, the stepped surface H, and is supported on the outer surface of the cover plate body 1. It should be noted that the present invention is an improvement on the first post 31 of the pole post 3 without any machined grooves. That is to say, during the secondary injection molding process, the molten plastic flows smoothly and fills the area between the mounting groove 12 and the pole post. Compared with the existing second injection molded part 42, which is blocked by the riveting part and restricted by the narrow and tortuous flow channel during the secondary injection molding process, the present invention does not require excessive injection pressure to form, and there is no need to worry about incomplete filling.

[0054] The second injection molded part 42 is connected to the first injection molded part 41 as a whole, and forms a lever structure with the folded part 15 as the fulcrum. It is supported by the outer surface of the cover plate body 1 to restrict the pole column 3 from coming out.

[0055] More specifically, the bottom of the stepped surface H or the undercut groove 322 is lower than the lower surface C of the folded part 15, so that the line connecting the undercut groove 322, the folded part 15 and the upper surface A of the folded part 15 forms an inwardly inclined lever structure with the folded part 15 as the fulcrum, thus setting a better and more stable restriction on the outward movement of the pole piece 3.

[0056] Furthermore, the distance M1 between the outer peripheral wall of the first column 31 and the wall of the mounting groove 12 is smaller than the distance M2 between the outer peripheral wall of the second injection molded part 42 and the outer peripheral surface B of the folded part 15. This arrangement makes the area between the outer peripheral wall of the second injection molded part 42 and the outer peripheral surface B of the folded part 15 larger, similar to a lever with a longer lever arm at one end and a shorter lever arm at the other end (i.e., the distance between the outer peripheral wall of the first column 31 and the wall of the mounting groove 12), resulting in better overall stability.

[0057] More specifically, the lower surface C of the first injection molded part 41 is lower than the lower surface C of the second pole post 3; the first injection molded part 41 and the second pole post 3 jointly press the sealing element 2, and the area of ​​the second pole post 3 pressing against the sealing element 2 is greater than the area of ​​the first injection molded part 41 pressing against the sealing element 2; the inner diameter of the sealing element 2 is greater than the inner diameter of the through hole 11, and the outer diameter of the sealing element 2 is greater than the outer diameter of the pole post 3 and less than or equal to the outer diameter of the first injection molded part 41; this arrangement makes the deformation of the sealing element 2 corresponding to the part of the first injection molded part 41 larger, and on the basis of achieving a good sealing effect on the lower surface C of the second pole post 32, it also achieves a local tighter pressing sealing effect.

[0058] Actual production process: See Figs. 1-6 ;

[0059] (1) The cover plate body 1 is made of aluminum plate. The through hole 11 and the mounting groove 12 are processed by stamping and folding process. The diameter of the through hole 11 is smaller than the diameter of the mounting groove 12. After the through hole 11, the mounting groove 12 and the extension wall 14 are formed, the folded part 15 and the connecting groove 140 are formed by secondary stamping, thus completing the production of the entire cover plate body 1. Of course, the explosion-proof valve hole and the liquid injection hole are completed simultaneously in the above process.

[0060] (2) Prepare positive and negative electrode pillars 3. In this embodiment, a copper plate or copper-aluminum composite plate of about 3mm is used to directly stamp out the overall stepped shape and vertical groove. Then, after stamping the stepped surface H and the corresponding vertical groove opening once, the undercut groove 322 can be formed. The undercut groove 322 in this embodiment is an open undercut groove 322, that is, openings are formed on the upper surface A (i.e., stepped surface H) and the outer peripheral surface B of the second pillar 32, so that the second injection molded part 42 can enter.

[0061] (3) Perform a first injection molding on the pole post 3 to form a first injection molded part 41. Place the pole post 3 in the mold so that the outer periphery forms the first injection molded part 41. The lower surface C of the first injection molded part 41 is flush with or lower than the lower surface C of the pole post 3 (i.e., the lower surface C of the second post 32). The upper surface A of the first injection molded part 41 is lower than the bottom surface W of the undercut groove 322 or slightly higher than the bottom surface W of the undercut groove 322, but the height does not exceed 1 / 3 of the distance (height) from the bottom surface W of the groove to the step surface H.

[0062] (4) Place the seal 2 at the bottom of the mounting groove 12, and then insert the pole body 3 with the first injection molded part 41, and wait for the second injection molding.

[0063] (5) During the secondary injection molding process, the pole post 3 is held to compress the seal 2 to the preset deformation state, and then the secondary injection molding is performed. The molten plastic flows smoothly from the outside to the inside and along the outer periphery of the pole post 3 and the inner wall of the mounting groove 12, smoothly filling the undercut groove 322, the empty part in the mounting groove 12, the connecting groove 140 and wrapping the entire folded part 15, and forming an annular part on the outer periphery of the cover plate body 1. Thus, the entire forming process of the pole post 3 and the cover plate body 1 is completed.

[0064] The entire molding process is simple and efficient, eliminating the need to consider the precision of riveting and folding, the reduced lifespan of the seal due to high-temperature deformation, excessive injection pressure, and incomplete injection. More importantly, it offers superior pressure resistance during use, combining multiple benefits into one.

[0065] The battery cover plate described in this invention exhibits superior performance in terms of sealing assembly stability, cost, miniaturization, conductivity, injection pressure control, sealing performance, and pressure resistance. Specifically, the battery cover plate utilizes a unique lever-type support structure design, integrating the second injection molded part with the first injection molded part, and forming a lever structure with the folded portion as a fulcrum. Supported by the outer surface of the cover plate body, this effectively prevents the terminal post from detaching outwards. This structure not only avoids the need for multiple layers of grooves on the outer circumference of the terminal post, thus reducing the overall volume and height of the terminal post and lowering costs, but also simplifies the manufacturing process, reduces processing steps, and improves the conductivity and service life of the terminal post. Simultaneously, this design reduces the injection pressure requirements, avoiding the problem of the riveted part bursting due to high injection pressure, as well as the aging and fatigue effects of the injection molded part on the sealing ring, improving the overall strength and sealing performance of the cover plate. Furthermore, the lever-type support structure truly provides pressure resistance, ensuring that the injection molded part can smoothly fill the outer circumference of the terminal post, improving the overall quality and reliability of the product.

[0066] The description of the above specification and embodiments is used to explain the scope of protection of the present invention, but does not constitute a limitation on the scope of protection of the present invention.

Claims

1. A battery cover plate with a lever support structure, characterized by: The battery cover plate comprises a cover plate body, a sealing element, a pole body and a plastic body; The cover plate body is provided with a through hole, a mounting groove for mounting the pole body at the through hole, and an extension wall extending outward along the groove wall of the mounting groove; the extension wall is folded outward to form a folded portion; The pole body comprises a first pole body and a second pole body arranged in a stepped manner, and the outer diameter of the second pole body is greater than that of the first pole body; the pole body is arranged in the mounting groove, and the outer diameter of the second pole body is smaller than the inner diameter of the mounting groove; a reverse slot is formed on the stepped surface of the second pole body; The sealing element is arranged in the mounting groove and between the pole body and the groove bottom of the mounting groove; The plastic body comprises a first injection element and a second injection element; The first injection element is injection molded along the outer periphery of the second pole body, and the upper surface of the first injection element is located below the groove bottom surface of the reverse slot, or the upper surface of the first injection element is located below the stepped surface and above the groove bottom surface of the reverse slot; The second injection element is injection molded along the extension wall and the folded portion, and is integrally connected with the first injection element to form an integral structure, so that the second injection element covers the outer periphery of the pole body, the stepped surface and supports the outer surface of the cover plate body; The second injection element is integrally connected with the first injection element, and forms a lever structure with the folded portion as a fulcrum, supported by the outer surface of the cover plate body, to limit the pole body from being pulled out outward.

2. A battery cover plate with lever support structure as claimed in claim 1, characterized in that: The reverse slots on the stepped surface are arranged at intervals, and the outer periphery of the reverse slot extends to the outer periphery of the second pole body and forms an open reverse slot, so that the second injection element enters the reverse slot from the end surface and the peripheral surface of the second pole body.

3. A battery cover plate with lever support structure as claimed in claim 2, characterized in that: The upper surface of the first injection element is located within the range formed by 1 / 3 of the height from the groove bottom surface of the reverse slot to the stepped surface.

4. A battery cover plate with lever support structure as claimed in claim 1, 2 or 3, characterized in that: A plurality of connecting grooves are also formed in the extension wall, which communicate the mounting groove with the outer periphery of the folded portion, for accommodating the second injection element.

5. A battery cover plate with lever support structure as claimed in claim 4, characterized in that: The folded portion comprises an upper surface, an outer peripheral surface and a lower surface; the lower surface has an inner groove portion; the inner groove portion is arranged for the second injection element to be placed in when injection, for limiting the second injection element from being pulled out.

6. A battery cover plate with lever support structure as claimed in claim 5, characterized in that: The stepped surface or the groove bottom of the reverse slot is lower than the lower surface of the folded portion.

7. A battery cover plate with lever support structure as claimed in claim 2, wherein: The distance between the outer peripheral wall of the first pole body and the groove wall of the mounting groove is smaller than the distance between the outer peripheral wall of the second injection element and the outer peripheral surface of the folded portion.

8. A battery cover plate with lever support structure as claimed in claim 1, wherein: The lower surface of the first injection element is lower than the lower surface of the second pole body; the first injection element and the second pole body jointly press the sealing element, and the area of the second pole body pressing against the sealing element is greater than the area of the first injection element pressing against the sealing element.

9. A battery cover plate with lever support structure as claimed in claim 8, characterized in that: The inner diameter of the sealing element is greater than the inner diameter of the through hole, the outer diameter of the sealing element is greater than the outer diameter of the pole body, and is smaller than or equal to the outer diameter of the first injection element.

10. The battery cover plate with lever support structure of claim 1, wherein: The inner wall diameter of the portion of the folded portion corresponding to the mounting groove is smaller than the diameter of the portion of the mounting groove close to the groove bottom.

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