CN221009062U

CN221009062U - Lithium battery cover plate with embedded conducting structure

Info

Publication number: CN221009062U
Application number: CN202322506153.0U
Authority: CN
Inventors: 李先锋; 刘剑; 李文宽
Original assignee: Jiangsu Hengchi Power Technology Co ltd
Current assignee: Jiangsu Hengchi Power Technology Co ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-05-24
Anticipated expiration: 2033-09-15

Abstract

The utility model relates to the technical field of lithium battery components, in particular to a lithium battery cover plate with an embedded conducting structure, which consists of a positive electrode conducting block, plastic, a top cover substrate rectangular sinking table, a top cover substrate post through hole, an explosion-proof piece, a liquid injection hole, a positive electrode sealing ring, a negative electrode sealing ring, a positive and negative motor post and a lower plastic protective bracket.

Description

Lithium battery cover plate with embedded conducting structure

Technical Field

The utility model relates to the technical field of lithium battery components, in particular to a lithium battery cover plate with an embedded conducting structure.

Background

The square aluminum shell battery is usually provided with the positive electrode of the battery cover plate and the battery shell in a full-conduction or weak-conduction state, and an equipotential is realized between the positive electrode of the battery and the shell so as to improve the voltage between the negative electrode of the battery and the shell, prevent hidden troubles of battery corrosion, battery capacity attenuation, cycle performance and rate performance reduction of the lithium ion battery caused by electrification of the shell, and further improve the safety and service life of the lithium ion battery.

In the current mainstream technology for conducting the positive electrode and the shell of the flat electrode conductive block cover plate, the plane of the positive electrode conductive block is usually contacted with the positive electrode mounting surface of the top cover substrate, the two surfaces are attached by applying riveting pressure to the electrode conductive block, the positive electrode conductive block and the top cover substrate are conducted in a surface contact mode, and then the cover plate and the shell are welded and sealed during the packaging of the battery cell, and then the battery shell is conducted. The technical process has very high requirements on the flatness and the smoothness of the electrode conductive pressing block, as well as the flatness and the smoothness of the mounting surface of the positive electrode terminal of the cover plate, and most of the electrode conductive blocks of the cover plate are provided with rectangular concave surfaces on the mounting surface of the positive electrode conductive block of the top cover substrate due to the PACK requirement, so that the rotation stopping function of the electrode conductive block is ensured, and the rotation stopping device greatly increases the process difficulty of the rectangular concave surface of the top cover substrate in the aspect of flatness and smoothness, and consumes a great amount of investment and resources for improving the precision of a die and the precision of punching equipment. In addition, the self internal resistance of the cover plate structural member material, unavoidable assembly tolerance of component packaging, along with slow release of component material stress after cover plate packaging riveting, resistance change between the positive electrode conductive block and the cover plate occurs, so that the conduction resistance between the positive electrode conductive block and the cover plate is unstable, and CPK consistency is poor. At present, the production and manufacturing process of the cover plate usually uses a mode of standing and placing for 72 hours after packaging to cope with the release process of stress after riveting and packaging of the cover plate, and then products with standard internal resistance are screened through multiple rounds of internal resistance total inspection, so that the production period of the cover plate is prolonged, the increase of the cost of the product and the consumption and waste of materials are directly caused, and the common problem of the production of the lithium battery combined cover plate with the structure is formed.

Aiming at the defects of the positive electrode and cover plate conduction technology process of the existing flat plate type electrode conductive block cover plate, the application provides an embedded conduction structure and an in-hole laser welding technology, so that the conduction mode of the positive electrode conductive block and the top cover substrate is thoroughly changed from the aspects of product structure and production technology, the stable low-resistance conduction of the positive electrode conductive block and the top cover substrate is realized, the appearance structure of a flat plate type electrode conductive block battery is not changed, the connection mode and performance of the existing battery module system PACK are not changed, the structural strength of the cover plate can be further improved, the convenience of packaging of the type of cover plate mass production is benefited, and defective products caused by unstable conduction of the positive electrode and the cover plate are thoroughly reduced.

Disclosure of utility model

The utility model aims to provide a lithium battery cover plate with an embedded conducting structure, which solves the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The utility model provides a lithium battery apron of embedded conduction structure, is by plastic on positive and negative electrode conducting block, the electrode conducting block, top cap base plate rectangle sunk platform, top cap base plate post through hole, explosion-proof piece, annotate liquid hole, anodal sealing washer, negative pole sealing washer, positive and negative motor post and lower plastic protective bracket constitute, positive and negative electrode conducting block installs on the electrode conducting block plastic, the inside of the top cap base plate rectangle sunk platform that sets up on the top cap base plate terminal surface is installed to the plastic on the electrode conducting block, top cap base plate post through hole has been seted up to the inside of top cap base plate rectangle sunk platform, positive and negative motor post through hole has been cup jointed to the inside of top cap base plate post through hole, the plastic effect is in the bottom surface of positive and negative electrode conducting block on the top cap base plate post through hole in proper order, the bottom of top cap base plate is provided with down the plastic protective bracket, wherein top cap base plate and lower plastic protective bracket are installed the cavity, the bottom center department of top cap base plate and be provided with explosion-proof piece down between the plastic protective bracket, a corner of top cap base plate terminal surface sets up the injection hole and installs liquid intercommunication structure.

As a preferable scheme of the utility model, the positive and negative electrode conductive blocks are composed of positive electrode conductive blocks and negative electrode conductive blocks, the plastic on the electrode conductive blocks is composed of positive electrode conductive block plastic and negative electrode conductive block plastic, two top cover substrate rectangular sinking tables on the top cover substrate are respectively arranged in a matching way with the positive electrode conductive blocks plastic and the negative electrode conductive blocks plastic, two top cover substrate post through holes are respectively arranged, wherein one top cover substrate rectangular sinking table is respectively provided with a positive electrode post through hole and a negative electrode post through hole, the positive and negative motor posts are composed of positive motor posts and negative motor posts, a positive sealing ring is sleeved at the joint of the positive motor posts and the positive electrode post through holes, and a negative sealing ring is sleeved at the joint of the negative motor posts and the negative electrode post through holes.

As a preferable scheme of the utility model, positive and negative electrode pole through holes are formed in the positive and negative electrode conductive blocks, a circumferential riveting hanging table is arranged above the positive and negative electrode pole through holes, the outer diameter of the circumferential riveting hanging table is larger than the diameter of the positive and negative motor pole, the depth of the circumferential riveting hanging table is 20% of the thickness of the positive electrode conductive pressing block, and the circumferential riveting hanging table is an accommodating space for positive and negative motor pole riveting expansion and pole material flowing.

As a preferable scheme of the utility model, a conduction boss pointing to the positive end of the top cover substrate is arranged at the periphery of the through hole of the positive electrode post below the positive electrode conductive block, the height of the conduction boss is 1/4-1/2 of the thickness of the top cover substrate, the inner diameter of the conduction boss is consistent with the inner diameter of the through hole of the positive electrode post of the positive electrode conductive block, the outer diameter of the conduction boss is consistent with the inner diameter of the through hole of the positive electrode post on the rectangular sinking table of the top cover substrate, so that the conduction boss is embedded into the through hole of the positive electrode post in a close-fitting mode, the positive electrode conductive block is arranged on the electrode conductive block in a plastic manner when the cover plate is packaged, then the conduction boss on the positive electrode conductive block is embedded into the through hole of the positive electrode post on the rectangular sinking table of the top cover substrate, and after packaging, the conduction boss is embedded into 1/4-1/2 of the inner wall height of the through hole of the positive electrode post.

As a preferable scheme of the utility model, a first conduction boss is arranged on the top cover substrate, wherein the first conduction boss is arranged along a positive electrode terminal post through hole of the top cover substrate and points to the positive electrode conductive block, the first conduction boss is arranged according to 1/4-1/2 of the thickness of the top cover substrate, and the first conduction boss on the top cover substrate is embedded into a positive electrode terminal post through hole on the positive electrode conductive block when the cover plate is packaged.

As a preferable scheme of the utility model, the guide neck of the positive electrode sealing ring is lower than the negative electrode sealing ring, the height of the guide neck is 1/4-1/3 of the thickness of the top cover substrate, when the conducting boss of the positive electrode conducting block is embedded into the through hole of the positive electrode terminal post and welded, a containing cavity is formed between the lower 1/3 part of the inner wall of the through hole of the positive electrode terminal post and the packaged positive electrode terminal post, the containing cavity is set as the guide neck containing cavity of the positive electrode sealing ring, and the negative electrode part has no structure.

Compared with the prior art, the utility model has the beneficial effects that:

1. According to the utility model, after the conducting boss on the positive electrode conducting block is embedded into the through hole of the positive terminal post of the top cover substrate and is welded in the hole, the internal resistances of the positive electrode conducting block and the top cover substrate can be reduced to be close to the internal resistances of the cover plate material and kept stable, the problems of unstable and high internal resistances of the cover plate positive electrode are thoroughly solved, the equipotential between the battery positive electrode and the shell is ensured, the capacity attenuation of the battery caused by overheat during charging and discharging of the battery is avoided, the service life of the battery is greatly prolonged, and the use safety of the battery is also effectively ensured.

2. According to the utility model, the sealing effect of the positive electrode pole combination is enhanced through the welded seam after the welding in the hole, the sealing ring works in a cold-hot alternating environment for a long time, and the risk of failure exists, so that the leakage condition can be generated, the welded seam can play a role in sealing, the double safety effect is realized except for the sealing ring, and the leakage condition is more effectively avoided.

3. In the utility model, through designing the conducting boss of the positive electrode conducting block to be embedded into the through hole of the positive electrode terminal post of the top cover substrate and carrying out in-hole welding, the whole process is related to the internal structure change between the positive electrode conducting block and the post observation hole of the positive electrode terminal of the top cover substrate, so that the technical process does not change the size of parts of the combined cover plate and the overall size and appearance of the packaged combined cover plate, and the interference and influence on the subsequent battery system module PACK are avoided.

4. In the utility model, the combined cover plate which is connected by riveting the positive electrode conductive block and the top cover substrate has a great demonstration effect, thus thoroughly solving the problems of higher positive internal resistance value and instability of the positive electrode conductive combined cover plate

Drawings

FIG. 1 is a schematic diagram of the overall explosive structure of the present utility model;

FIG. 2 is a schematic view of the assembled structure of FIG. 1 according to the present utility model;

FIG. 3 is a schematic view of the back side structure of FIG. 2 in accordance with the present utility model;

fig. 4 is a schematic side view of the top cover substrate of the present utility model.

In the figure: 1. positive and negative electrode conductive blocks; 2. plastic is arranged on the electrode conducting block; 3. a top cover substrate; 4. rectangular sinking platform of top cover substrate; 5. the top cover substrate pole through hole; 6. explosion-proof sheet; 7. a liquid injection hole; 8. an anode sealing ring; 9. a negative electrode sealing ring; 10. positive and negative motor poles; 11. a lower plastic protective bracket; 12. positive and negative electrode post through holes; 13. a circumferential riveting hanging table; 14. the boss is conducted; 15. the positive electrode sealing ring guides the neck to hold the cavity; 16. and (5) conducting the first boss.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present utility model are within the scope of protection of the present utility model.

Referring to fig. 1-4, the present utility model provides a technical solution:

The utility model provides a lithium cell apron of embedded conduction structure, comprises positive negative electrode conducting block 1, plastic 2 on the electrode conducting block, top cap base plate 3, top cap base plate rectangle sunk platform 4, top cap base plate post through-hole 5, explosion-proof piece 6, annotate liquid hole 7, anodal sealing washer 8, negative electrode sealing washer 9, positive negative motor post 10 and lower plastic protection support 11, its characterized in that: the positive and negative electrode conducting blocks 1 are arranged on the electrode conducting blocks on plastic 2, the electrode conducting blocks on plastic 2 are arranged in a top cover substrate rectangular sinking table 4 arranged on the end face of a top cover substrate 3, a top cover substrate post through hole 5 is formed in the top cover substrate rectangular sinking table 4, positive and negative motor posts 10 are sleeved in the top cover substrate post through hole 5, one ends of the positive and negative motor posts 10 sequentially penetrate through the top cover substrate post through hole 5 and the electrode conducting blocks on the bottom face of the positive and negative electrode conducting blocks 1, the plastic 2 acts on the bottom face of the positive and negative electrode conducting blocks, a lower plastic protection support 11 is arranged at the bottom of the top cover substrate 3, a mounting cavity is formed by the top cover substrate 3 and the lower plastic protection support 11, an explosion-proof piece 6 is arranged between the bottom center of the top cover substrate 3 and the lower plastic protection support 11, a corner of the end face of the top cover substrate 3 is provided with a liquid injection hole 7, and the liquid injection hole 7 and the mounting cavity are of a communicating structure.

As a preferable scheme of the utility model, the positive and negative electrode conductive blocks 1 are composed of positive electrode conductive blocks and negative electrode conductive blocks, the plastic 2 on the electrode conductive blocks is composed of positive electrode conductive block plastic and negative electrode conductive block plastic, two top cover substrate rectangular sinking tables 4 on the top cover substrate 3 are arranged and respectively matched with the positive electrode conductive block plastic and the negative electrode conductive block plastic, two top cover substrate post through holes 5 are respectively arranged and are respectively a positive electrode terminal post through hole and a negative electrode terminal post through hole, one positive and negative motor post 10 is arranged in each top cover substrate rectangular sinking table 4 and is composed of a positive motor post and a negative motor post, a positive sealing ring 8 is sleeved at the joint of the positive motor post and the positive electrode terminal post through hole, and a negative sealing ring 9 is sleeved at the joint of the negative motor post and the negative electrode terminal post through hole.

The embodiment of the application provides a lithium battery cover plate with an embedded conduction structure and a cover plate hole laser welding technology, wherein the conduction mode of a positive electrode conductive block and a cover plate substrate is changed from the traditional riveting surface contact mode to the embedded welding riveting mode under the condition of not changing the integral appearance of a flat electrode conductive block cover plate. Thoroughly solves the breakfast of unstable conduction internal resistance and poor consistency between the positive electrode conductive block and the top cover substrate in terms of structure and process.

The embedded conduction structure lithium battery cover plate provided by the embodiment of the application is characterized in that the embedded conduction boss and the hole laser welding technology are used for distinguishing important characteristics of the common riveting surface contact conduction structure lithium battery cover plate:

One of the characteristics is that a positive electrode pole through hole 12 is arranged on a positive electrode conductive block 1, a circumference riveting hanging table 13 is arranged above the positive electrode pole through hole 12, the outer diameter of the circumference riveting hanging table 13 is larger than the diameter of a positive electrode pole 10, the depth of the circumference riveting hanging table 13 is 20% of the thickness of a positive electrode conductive pressing block 1, and the circumference riveting hanging table 13 is an accommodating space for the positive electrode pole 10 to rivet and expand, and pole materials flow. The riveting hanging table 13 plays a role in that when the combined cover plate is riveted and packaged, the riveting force applied to the positive and negative electrode conductive block 1 and the positive and negative motor pole 10 can cause the positive and negative motor pole 10 to deform and expand in the top cover substrate pole through hole 5, on one hand, the expanded material of the positive and negative motor pole 10 flows to the riveting hanging table 13, the combined structure is riveted and fixed, and the drawing force of the positive and negative motor pole 10 is ensured; on the other hand, the positive and negative motor pole 10 expands and compresses a preset sealing ring, and plays a sealing role on the combined structure of the positive and negative motor pole 10.

The second characteristic is that an embedded conducting structure of the cover plate is that a conducting boss 14 pointing to the positive end of the top cover substrate 3 is arranged on the periphery of a positive electrode and negative electrode post through hole 12 below the positive electrode conductive block, the height of the conducting boss 14 is 1/4-1/2 of the thickness of the top cover substrate 3, the inner diameter of the conducting boss 14 is consistent with the inner diameter of the positive electrode and negative electrode post through hole 12 of the positive electrode conductive block 1, the outer diameter of the conducting boss 14 is consistent with the inner diameter of the positive electrode post through hole on the top cover substrate rectangular sinking table 4, so that the conducting boss 14 is embedded into the positive electrode post through hole in a close-fitting mode, when the cover plate is packaged, the positive electrode conductive block 1 is filled into the electrode conductive block, the positive electrode conductive block 1 is filled into the positive electrode post through hole on the top cover substrate rectangular sinking table 4, and then the conducting boss 14 is embedded into 1/4-1/2 of the inner wall height of the positive electrode post through hole after packaging.

The embedded conducting structure of other embodiments of the present application is that a conducting boss I16 is arranged on the top cover substrate 3, wherein the conducting boss I16 is arranged along the positive electrode terminal post through hole of the top cover substrate 3 pointing to the positive electrode conducting block, and the height of the conducting boss I16 is arranged according to 1/4-1/2 of the thickness of the top cover substrate. When the cover plate is packaged, the first conducting boss 16 on the top cover substrate is embedded into the pole through hole 12 on the positive electrode conducting block.

In another embodiment of the present application, the riveting pressure is applied to the positive electrode post and the positive electrode conductive block, and the conductive boss of the positive electrode conductive block inserted into the through hole of the top cover substrate post is riveted with the inner wall of the through hole of the top cover substrate post at the moment that the positive electrode post is expanded by the riveting pressure, or the conductive boss of the top cover substrate is riveted with the inner wall of the through hole of the positive electrode conductive pressing block post at the moment that the positive electrode post is expanded by the riveting pressure, so that the conductive boss is conducted without laser welding in the hole.

The third feature is that the "hole laser welding" technology of the cover plate of the present application is to embed the conducting boss 14 on the positive electrode conducting block into the through hole of the positive electrode post on the rectangular sinking table of the top cover substrate, so that the positive electrode conducting block and the positive electrode end of the top cover substrate form an "embedded conducting structure", which is placed in the special fixture of the present application, from the cell side of the through hole of the positive electrode post of the top cover substrate, the inner wall of the through hole of the positive electrode post of the top cover substrate is embedded with the conducting boss 14 by using low pulse width laser, and the "hole laser welding" is applied to weld and communicate the conducting boss 14 embedded in the positive electrode top cover substrate with the inner wall of the through hole of the positive electrode post, thus forming the "embedded conducting structure" of the present application, which is the sub-assembly a of the present embodiment. The welded positive electrode conductive block is connected with the top cover substrate 3 into a whole through the conduction boss 14 and is conducted, and finally the cover plate is welded with the shell, so that the equipotential conduction of the positive electrode of the cover plate and the battery shell is realized.

According to the application, the positive electrode conductive block is connected with the positive electrode end of the top cover substrate into a whole through the process of 'hole laser welding' of the cover plate, so that the conduction mode between the positive electrode conductive block and the top cover substrate is changed, the unstable and difficult-to-control riveting surface close contact mode is changed into the material welding conduction mode, the resistance between the positive electrode conductive block and the top cover substrate 3 is effectively reduced, the stability and consistency of conduction internal resistance are ensured, and the ineffectiveness diseases of unstable conduction resistance and poor consistency between the positive electrode of the cover plate and the shell are thoroughly solved.

In the process of 'hole laser welding' of other embodiments of the application, at the positive end of the top cover substrate, a first conduction boss 16 is arranged upwards along a through hole of a pole of the top cover substrate, when the cover plate is packaged, the first conduction boss 16 on the top cover substrate is embedded into the through hole of the pole of the positive electrode conductive block, and from the connection side of a module of the through hole of the positive electrode conductive pressing block, the first conduction boss 16 on the embedded top cover substrate and the inner wall of the through hole of the pole of the positive electrode conductive pressing block are subjected to 'hole laser welding', so as to form an 'embedded conduction structure' -integrated sub-assembly.

The positive electrode sealing ring 8 and the negative electrode sealing ring 9 of the cover plate are arranged differently from the positive electrode and the negative electrode of other combined cover plate sealing rings, and are respectively arranged in different structural sizes of the positive electrode and the negative electrode, the guide neck of the positive electrode sealing ring 8 is lower than the negative electrode sealing ring, the height of the guide neck is arranged according to 1/4-1/3 of the thickness of the top cover substrate, after the conducting boss 14 of the positive electrode conducting block is embedded into the through hole of the positive electrode terminal post and welded, a containing cavity is formed between the lower 1/3 part of the inner wall of the through hole of the positive electrode terminal post and the packaged positive electrode terminal post, and the containing cavity is arranged as a positive electrode sealing ring guide neck containing cavity 15, and the negative electrode part has no structure.

The application is characterized in that the embedded conducting structure of the cover plate anode is arranged on the anode installation side of the anode conducting block and the top cover substrate, the conducting performance of the anode conducting block and the top cover substrate is changed into the material ' hole laser welding ' connection from simply relying on riveting surface contact through the embedded conducting structure ' and the ' hole laser welding ' process, the overall appearance size of the product is not changed, the performance of the system PACK of the manufactured battery core product is not influenced, the stability and consistency of the conducting internal resistance are ensured, and the problems of unstable conducting resistance and poor consistency between the cover plate anode and the shell are thoroughly solved.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a lithium cell apron of embedded conduction structure, by positive and negative electrode conducting block (1), plastic (2) on the electrode conducting block, top cap base plate (3), top cap base plate rectangle sink platform (4), top cap base plate post through-hole (5), explosion-proof piece (6), annotate liquid hole (7), positive pole sealing washer (8), negative pole sealing washer (9), positive and negative motor post (10) and lower plastic protection support (11) constitute, its characterized in that: positive negative electrode conducting block (1) is installed on electrode conducting block plastic (2), plastic (2) installs the inside of top cap base plate rectangle sunk platform (4) that sets up on top cap base plate (3) terminal surface on the electrode conducting block, top cap base plate post through-hole (5) have been seted up to the inside of top cap base plate rectangle sunk platform (4), positive negative motor post (10) have been cup jointed to the inside of top cap base plate post through-hole (5), positive negative motor post (10)'s one end is passed top cap base plate post through-hole (5), electrode conducting block on plastic (2) are used in the bottom surface of positive negative electrode conducting block (1) in proper order, the bottom of top cap base plate (3) is provided with plastic protective bracket (11) down, wherein top cap base plate (3) and plastic protective bracket (11) down constitute and install the cavity, top cap base plate (3) bottom center department and be located and be provided with between top cap base plate (3) and the protective bracket (11) explosion-proof piece (6), a corner of the terminal surface of top cap base plate (3) is provided with injection hole (7) and injection hole (7) wherein the injection hole structure is intercommunication.

2. The lithium battery cover plate with an embedded conducting structure according to claim 1, wherein: the positive and negative electrode conducting blocks (1) are composed of positive electrode conducting blocks and negative electrode conducting blocks, the plastic (2) on each electrode conducting block is composed of positive electrode conducting block plastic and negative electrode conducting block plastic, two top cover substrate rectangular sinking tables (4) on the top cover substrate (3) are arranged and are respectively arranged in a matched mode with the positive electrode conducting block plastic and the negative electrode conducting block plastic, two top cover substrate post penetrating holes (5) are respectively formed in the positive electrode terminal post penetrating holes and the negative electrode terminal post penetrating holes, one top cover substrate rectangular sinking table (4) is arranged, positive and negative motor posts (10) are composed of positive motor posts and negative motor posts, positive sealing rings (8) are sleeved at the joint positions of the positive motor posts and the positive electrode terminal post penetrating holes, and negative sealing rings (9) are sleeved at the joint positions of the negative motor posts and the negative electrode terminal post penetrating holes.

3. The lithium battery cover plate with an embedded conducting structure according to claim 2, wherein: positive and negative electrode post through holes (12) are formed in the positive and negative electrode conductive blocks (1), a circumference riveting hanging table (13) is arranged above the positive and negative electrode post through holes (12), the outer diameter of the circumference riveting hanging table (13) is larger than the diameter of a positive and negative motor post (10), the depth of the circumference riveting hanging table (13) is set according to 20% of the thickness of the positive electrode conductive pressing block (1), and the circumference riveting hanging table (13) is an accommodating space for the positive and negative motor post (10) to rivet and expand, and post materials flow.

4. A lithium battery cover plate of an embedded conduction structure according to claim 3, wherein: the periphery of a positive electrode column penetrating hole (12) below the positive electrode conducting block is provided with a conducting boss (14) pointing to the positive electrode end of the top cover substrate (3), the height of the conducting boss (14) is 1/4-1/2 of the thickness of the top cover substrate (3), the inner diameter of the conducting boss (14) is consistent with the inner diameter of a positive electrode column penetrating hole (12) of the positive electrode conducting block (1), the outer diameter of the conducting boss (14) is consistent with the inner diameter of a positive electrode column penetrating hole on the top cover substrate rectangular sinking table (4), so that the conducting boss (14) is embedded into the positive electrode column penetrating hole in a close-fitting mode, when the cover plate is packaged, the positive electrode conducting block (1) is arranged in the positive electrode conducting block, then the conducting boss (14) on the positive electrode conducting block (1) is embedded into the positive electrode column penetrating hole on the top cover substrate rectangular sinking table (4), and after packaging, the conducting boss (14) is embedded into 1/4-1/2 of the height of the positive electrode column penetrating hole.

5. A lithium battery cover plate of an embedded conduction structure according to claim 3, wherein: the top cover substrate (3) is provided with a first conduction boss (16), wherein the first conduction boss (16) is arranged along a positive electrode terminal through hole of the top cover substrate (3) in a direction to the positive electrode conductive block, the height of the first conduction boss (16) is 1/4-1/2 of the thickness of the top cover substrate (3), and when the cover plate is packaged, the first conduction boss (16) on the top cover substrate (3) is embedded into the positive electrode terminal through hole (12) on the positive electrode conductive block.

6. The lithium battery cover plate with an embedded conductive structure according to claim 4, wherein: the guide neck of the positive electrode sealing ring (8) is lower than the negative electrode sealing ring, the height of the guide neck is 1/4-1/3 of the thickness of the top cover substrate (3), when the conducting boss (14) of the positive electrode conducting block is embedded into the through hole of the positive electrode terminal post and welded, an accommodating cavity is formed between the lower 1/3 part of the inner wall of the through hole of the positive electrode terminal post and the packaged positive electrode terminal post, the accommodating cavity is set as a guide neck accommodating cavity (15) of the positive electrode sealing ring, and the negative electrode part has no structure.