Metal sealing bonding pad, sealing structure, battery assembly and capacitive lithium battery

Abstract

The utility model provides a metal sealing bonding pad, a sealing structure, a battery assembly and a capacitive type lithium battery, a mounting cavity is formed in a sealing column of the metal sealing bonding pad, the mounting cavity is used for accommodating a welding position of a tab and a terminal of the capacitive type lithium battery, and the side wall of the mounting cavity is also used for sealing and welding with the tab of the capacitive type lithium battery; the first clamping sealing part is arranged at the press-in end of the sealing column; the second clamping sealing part is arranged at the pressing end of the sealing column and forms a clamping sealing cavity with the first clamping sealing part, and the clamping sealing cavity is used for clamping and fixing a sealing ring of the capacitive lithium battery. When the metal sealing pad is used, the metal sealing pad clamps and fixes the sealing ring and can be tightly attached to the sealing ring, the sealing performance of connection between the metal sealing pad and the sealing ring is improved, the structure is simple, the assembling efficiency is high, the cost is low, the sealing performance is good, and protection on the welding position of the electrode lug and the terminal of the capacitive lithium battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor type lithium battery production, in particular to a metal sealing pad, a sealing structure, a battery assembly and a capacitor type lithium battery. Background Art

[0002] Capacitor-type lithium battery is also called lithium-ion capacitor. Lithium-ion capacitor is a new type of energy storage element between supercapacitor and secondary lithium battery. Wound capacitor-type lithium battery is a commonly used one at present. It mainly presses the positive and negative poles of the wound battery into the plug hole, then injects liquid, puts into the shell, and seals to obtain a capacitor-type lithium battery. However, the plug is easily corroded by the electrolyte during long-term use, causing leakage.

[0003] In order to solve the above technical problems, some scholars have developed a method and a device for preparing a highly sealed lithium ion capacitor, such as Chinese patent number CN 113192764A. The present invention mainly improves the packaging material and structure, replaces the traditional rubber plug with an aluminum nail, and installs the aluminum nail in the injection hole by welding. At the same time, a detachable sealing cover is arranged on the metal cover plate, and the protruding aluminum nail is buckled by the annular groove to further avoid leakage, effectively improve the sealing, corrosion resistance and pressure resistance of the monomer and the assembled system, and improve its service life.

[0004] Although the above-mentioned high-sealing lithium ion capacitor has improved its sealing performance, it is necessary to add a metal cover plate and aluminum nails at the same time, resulting in a complex sealing structure and high cost of the traditional lithium ion capacitor. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a metal sealing pad, a sealing structure, a battery assembly and a capacitor-type lithium battery with a simple structure, high assembly efficiency, low cost and good sealing performance, and improve the protection of the welding point between the pole ear and the terminal of the capacitor-type lithium battery.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A metal sealing pad, comprising:

[0008] A sealing column, wherein a mounting cavity is formed in the sealing column, the mounting cavity is used to accommodate the welding portion between the pole ear and the terminal of the capacitor type lithium battery, and the side wall of the mounting cavity is also used for sealing and welding with the pole ear of the capacitor type lithium battery;

[0009] A first clamping sealing portion, the first clamping sealing portion being arranged at a press-in end of the sealing column;

[0010] A second clamping seal portion, wherein the second clamping seal portion is disposed at the pressing end of the sealing column and forms a clamping seal cavity with the first clamping seal portion, wherein the clamping seal cavity is used to clamp a sealing ring of a fixed capacitor type lithium battery.

[0011] In one embodiment, the first clamping seal portion is disposed around the periphery of the press-in end.

[0012] In one embodiment, the second clamping seal portion is disposed around the periphery of the pressing end.

[0013] In one embodiment, the first clamping sealing portion is protrudingly disposed at the pressing end, and the second clamping sealing portion is protrudingly disposed at the pressing end.

[0014] In one embodiment, the first clamping seal portion, the second clamping seal portion and the sealing column are an integrally formed structure; and / or,

[0015] The first clamping sealing portion is a convex ring; and / or,

[0016] The metal sealing pad is one of a sealing nickel pad, a sealing nickel alloy pad, a sealing aluminum pad or a sealing aluminum alloy pad; and / or,

[0017] The first clamping seal portion, the sealing column and the second clamping seal portion are connected to form an inverted cone shape, the first clamping seal portion is located at the bottom of the cone, and the second clamping seal portion is located at the top of the cone; and / or,

[0018] A first cavity and a second cavity are formed in the installation cavity. The first cavity is used to accommodate part of the pole lug, and the inner side wall of the first cavity is sealed and welded to the outer peripheral wall of the pole lug. The second cavity is used to accommodate the welding point between the pole lug and the terminal.

[0019] In one embodiment, a side of the second clamping sealing portion facing away from the first clamping sealing portion is formed with an outwardly expanding bell mouth, and the outwardly expanding bell mouth is in communication with the installation cavity.

[0020] A sealing structure comprises the metal sealing pad and sealing ring as described in any of the above embodiments, wherein the number of the metal sealing pads is two, namely a positive metal sealing pad and a negative metal sealing pad, and the positive metal sealing pad and the negative metal sealing pad are respectively separated and embedded in the sealing ring.

[0021] A battery assembly, comprising the sealing structure described in any one of the above embodiments, a positive electrode ear, a negative electrode ear, a positive terminal and a negative terminal, wherein the positive electrode ear and the positive terminal are partially inserted into the mounting cavity of the positive electrode metal sealing pad, and the positive electrode ear located in the mounting cavity is sealed and welded to the inner wall of the mounting cavity, and is also welded to the positive terminal located in the mounting cavity, and the positive terminal is partially exposed outside the mounting cavity;

[0022] The negative electrode ear and the negative terminal are partially inserted into the mounting cavity of the negative electrode metal sealing pad, and the negative electrode ear located in the mounting cavity is sealed and welded to the inner wall of the mounting cavity, and is also welded to the negative terminal located in the mounting cavity, and the negative terminal is partially exposed in the mounting cavity.

[0023] In one embodiment, the positive electrode ear and / or the positive electrode ear includes a connecting piece, a connecting column and a frustum, the frustum is connected to the connecting piece through the connecting column, the top of the frustum is welded to the positive terminal and / or the negative terminal, and the bottom of the frustum is sealed and welded to the side wall of the mounting cavity.

[0024] A capacitor-type lithium battery comprises the battery assembly described in any one of the above embodiments.

[0025] Compared with the prior art, the utility model has at least the following advantages:

[0026] 1) Since the pressing end of the sealing column is provided with a first clamping seal portion and the pressing end is provided with a second clamping seal portion, and the first clamping seal portion and the second clamping seal portion can form a clamping seal cavity, the clamping seal cavity can well clamp and fix the sealing ring. When in use, the metal sealing pad is interference fit in the sealing ring of the capacitor type lithium battery, so that the plastic ring can be well attached to the clamping seal cavity, thereby achieving close attachment of the metal sealing pad and the sealing ring, and improving the sealing performance of the connection between the metal sealing pad and the sealing ring. At the same time, the first clamping seal portion can effectively block the electrolyte from entering the sealing ring to cause corrosion of the sealing ring, thereby improving the service life of the capacitor type lithium battery. In this way, not only the structure is simple, but also the assembly efficiency is high, the cost is low, and the sealing performance is good.

[0027] 2) Since an installation cavity is formed in the sealing column, and since the side wall of the installation cavity is also used for sealing and welding with the pole ear of the capacitor type lithium battery, on the one hand, the welding and fixation of the pole ear and the metal sealing pad are realized, and on the other hand, the sealing setting of the pole ear and the metal sealing pad is realized, which effectively avoids the exposure of the electrolyte. On the other hand, the installation cavity can well accommodate the welding point between the pole ear and the terminal of the capacitor type lithium battery, improves the protection of the welding point between the pole ear and the terminal of the capacitor type lithium battery, effectively blocks the entry of part of the electrolyte, thereby increasing the service life of the capacitor type lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic structural diagram of a metal sealing pad in one direction according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A cross-sectional view of the metal sealing pad in one direction shown;

[0031] Figure 3 This is a structural schematic diagram of a sealing structure in one direction according to an embodiment of the utility model;

[0032] Figure 4 for Figure 3 A cross-sectional view of the sealing structure in one direction shown;

[0033] Figure 5 It is a cross-sectional view of a capacitor-type lithium battery according to an embodiment of the present invention in one direction.

[0034] Figure 6 for Figure 5 A partial enlarged view shown in the middle.

[0035] Figure numerals: 1, capacitor-type lithium battery; 10, battery assembly; 11, sealing structure; 111, metal sealing pad; 1111, sealing column; 1111a, mounting cavity; 1112, first clamping sealing portion; 1113, second clamping sealing portion; 1113a, outwardly expanding bell mouth; 1114, clamping sealing cavity; 112, sealing ring; 12, positive ear; 121, cone; 13, negative ear; 14, positive terminal; 15, negative terminal; 20, battery cell; 30, shell; 31, sealing groove. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0040] like Figure 1 and Figure 2 As shown, a metal sealing pad 111 of an embodiment includes a sealing column 1111, a first clamping sealing portion 1112 and a second clamping sealing portion 1113, wherein the sealing column 1111 is formed with an installation cavity 1111a, wherein the installation cavity 1111a is used to accommodate the welding portion between the pole ear and the terminal of the capacitor type lithium battery 1, and the side wall of the installation cavity 1111a is also used for sealing and welding with the pole ear of the capacitor type lithium battery 1; the first clamping sealing portion 1112 is arranged at the pressing end of the sealing column 1111; the second clamping sealing portion 1113 is arranged at the pressing end of the sealing column 1111, and forms a clamping sealing cavity 1114 with the first clamping sealing portion 1112, wherein the clamping sealing cavity 1114 is used to clamp and fix the sealing ring 112 of the capacitor type lithium battery 1.

[0041] It can be understood that since the pressing end of the sealing column 1111 is provided with a first clamping sealing portion 1112 and the pressing end is provided with a second clamping sealing portion 1113, and the first clamping sealing portion 1112 and the second clamping sealing portion 1113 can form a clamping sealing cavity 1114, so that the clamping sealing cavity 1114 can well clamp and fix the sealing ring 112. When in use, the metal sealing pad 111 is interference fit in the sealing ring 112 of the capacitor type lithium battery 1, so that the plastic ring can be well attached to the clamping sealing cavity 1114, thereby achieving a close attachment of the metal sealing pad 111 and the sealing ring 112, and improving the sealing performance of the connection between the metal sealing pad 111 and the sealing ring 112. At the same time, the first clamping sealing portion 1112 can effectively block the electrolyte from entering the sealing ring 112 to cause corrosion of the sealing ring 112, thereby improving the service life of the capacitor type lithium battery 1. In this way, not only is the structure simple, but the assembly efficiency is high, the cost is low, and the sealing performance is good.

[0042] Furthermore, since an installation cavity 1111a is formed in the sealing column 1111, and since the side wall of the installation cavity 1111a is also used for sealing and welding with the pole ear of the capacitor type lithium battery 1, on the one hand, the welding and fixation of the pole ear and the metal sealing pad 111 is realized, and on the other hand, the sealing setting of the pole ear and the metal sealing pad 111 is realized, which effectively avoids the exposure of the electrolyte. On the other hand, the installation cavity 1111a can well accommodate the welding point between the pole ear and the terminal of the capacitor type lithium battery 1, improves the protection of the welding point between the pole ear and the terminal of the capacitor type lithium battery 1, and effectively blocks the entry of part of the electrolyte, thereby improving the service life of the capacitor type lithium battery 1.

[0043] In one embodiment, a first cavity and a second cavity are formed in the installation cavity 1111a, and the first cavity is used to accommodate part of the pole ear and is sealed and welded to the outer peripheral wall of the pole ear, that is, the pole ear part is arranged in the first cavity and protrudes to the second cavity, and is welded and fixed to the terminal, so that the second cavity can accommodate the welding point between the pole ear and the terminal to achieve protection of the welding point between the pole ear and the terminal.

[0044] like Figure 1 and Figure 2 As shown, in one embodiment, the first clamping sealing portion 1112 is arranged around the periphery of the press-in end to increase the contact area between the first clamping sealing portion 1112 and the sealing ring 112, thereby improving the clamping and fixing of the sealing ring 112 by the first clamping sealing portion 1112.

[0045] like Figure 1 and Figure 2As shown, in one embodiment, the second clamping seal portion 1113 is arranged around the periphery of the pressing end to increase the contact area between the second clamping seal portion 1113 and the sealing ring 112, thereby improving the clamping and fixing of the sealing ring 112 by the second clamping seal portion 1113, especially in conjunction with the use of the first clamping seal portion 1112 arranged around the periphery of the pressing end, so as to better improve the clamping and fixing of the metal sealing pad 111 to the sealing ring 112.

[0046] In one embodiment, the first clamping seal portion 1112 is protruded from the pressing end, and the second clamping seal portion 1113 is protruded from the pressing end, so as to ensure that the protruding first clamping seal portion 1112 and the protruding second clamping seal portion 1113 can form a better clamping seal cavity 1114 on the outer peripheral wall of the sealing column 1111, so that the clamping seal cavity 1114 can clamp and fix the sealing ring 112 well.

[0047] In one embodiment, the first clamping seal portion 1112, the second clamping seal portion 1113 and the sealing column 1111 are an integrally formed structure to ensure the connection strength among the first clamping seal portion 1112, the sealing column 1111 and the second clamping seal portion 1113, thereby improving the service life of the metal sealing pad 111.

[0048] In one embodiment, the first clamping seal portion 1112 is a convex ring. It can be understood that by setting the first clamping seal portion 1112 as a convex ring, the first clamping seal portion 1112 and the mounting hole wall of the sealing ring 112 are in arc contact, thus effectively reducing the friction between the first clamping seal portion 1112 and the mounting hole wall of the sealing ring 112, which not only reduces the strain on the sealing ring 112, thereby reducing the leakage of the capacitor type lithium battery 1, but also ensures that the metal sealing pad 111 can be smoothly embedded in the sealing ring 112, thereby improving the assembly efficiency of the capacitor type lithium battery 1, and also ensures that the first clamping seal portion 1112 can form an inverted card structure in the sealing ring 112, especially when used in conjunction with the second holding seal portion, so as to achieve better clamping and fixing of the sealing ring 112; and the first clamping seal portion 1112 can form a blocking wall with the sealing ring 112 located inside the battery cell 20, effectively avoiding the phenomenon of leakage caused by direct corrosion of the electrolyte to the sealing ring 112, thereby improving the sealing of the sealing assembly.

[0049] In one embodiment, the metal sealing pad 111 is one of a sealing nickel pad, a sealing nickel alloy pad, a sealing aluminum pad or a sealing aluminum alloy pad to ensure normal welding.

[0050] like Figure 1 and Figure 2As shown, in one embodiment, the first clamping seal portion 1112, the sealing column 1111 and the second clamping seal portion 1113 are connected in the shape of an inverted cone 121, the first clamping seal portion 1112 is located at the bottom of the cone, and the second clamping seal portion 1113 is located at the top of the cone. Since the first clamping seal portion 1112, the sealing column 1111 and the second clamping seal portion 1113 are connected in the shape of an inverted cone 121, that is, the first clamping seal portion 1112 is smaller than the width of the second clamping seal portion 1113, the metal sealing pad 111 can be smoothly embedded in the sealing ring 112 without damaging the sealing ring 112.

[0051] like Figure 1 and Figure 2 As shown, in one embodiment, an outwardly expanding trumpet mouth 1113a is formed on a side of the second clamping seal portion 1113 facing away from the first clamping seal portion 1112, and the outwardly expanding trumpet circle is connected to the mounting cavity 1111a, so that the added outwardly expanding trumpet mouth 1113a is convenient for welding, that is, the welding field of view is increased, and the welding quality and welding strength between the pole ear and the metal sealing pad 111 are effectively guaranteed.

[0052] like Figure 3 and Figure 4 As shown, the present disclosure also provides a sealing structure 11, including the metal sealing pad 111 and the sealing ring 112 described in any of the above embodiments, the number of the metal sealing pads 111 is two, namely the positive metal sealing pad 111 and the negative metal sealing pad 111, the positive metal sealing pad 111 and the negative metal sealing pad 111 are respectively separated and embedded in the sealing ring 112, so as to realize the separated embedding of the positive metal sealing pad 111 and the negative metal sealing pad 111, which is convenient for users to quickly assemble the positive ear 12 and the negative ear 13 of the battery cell 20, and effectively avoid the short circuit phenomenon between the positive ear 12 and the negative ear 13 due to the lack of separation.

[0053] In one embodiment, the sealing ring 112 is formed with two mounting holes, and the sizes of the two mounting holes are adapted to the positive metal sealing pad 111 and the negative metal sealing pad 111 to ensure that the positive metal sealing pad 111 and the negative metal sealing pad 111 can be pressed into the sealing ring 112 with interference fit.

[0054] In one of the embodiments, the sealing ring 112 is an elastic sealing ring 112, such as a plastic ring. When the metal sealing pad 111 is interference fit in the elastic sealing ring 112, the elastic sealing ring 112 can be well attached to the clamping sealing cavity 1114, thereby achieving close adhesion between the metal sealing pad 111 and the sealing ring 112, and improving the sealing performance of the connection between the metal sealing pad 111 and the sealing ring 112. At the same time, the first clamping sealing portion 1112 can effectively block the electrolyte from entering the sealing ring 112 to cause corrosion of the sealing ring 112.

[0055] like Figure 5 and Figure 6 As shown, the present disclosure also provides a battery assembly 10, including the sealing structure 11, the positive electrode ear 12, the negative electrode ear 13, the positive terminal 14 and the negative terminal 15 described in any of the above embodiments, the positive electrode ear 12 and the positive terminal 14 are partially penetrated into the mounting cavity 1111a of the positive metal sealing pad 111, and the positive electrode ear 12 located in the mounting cavity 1111a is sealed and welded with the inner side wall of the mounting cavity 1111a, so that the positive electrode ear 12 and the side wall of the mounting cavity 1111a are sealed and welded. The seal can effectively prevent the electrolyte from leaking out of the installation cavity 1111a of the positive metal sealing pad 111, and can also be welded to the positive terminal 14 located in the installation cavity 1111a, ensuring that the welding point between the positive ear 12 and the positive terminal 14 is located in the installation cavity 1111a, so that the installation cavity 1111a can play a good protective role for the welding point between the positive ear 12 and the positive terminal 14, and the positive terminal 14 is partially exposed in the installation cavity 1111a so that the positive terminal 14 can be welded and fixed to the external connection product.

[0056] Similarly, the negative electrode ear 13 and the negative terminal 15 are partially penetrated into the mounting cavity 1111a of the negative electrode metal sealing pad 111, and the negative electrode ear 13 located in the mounting cavity 1111a is sealed and welded to the inner side wall of the mounting cavity 1111a, so as to achieve the sealing between the negative electrode ear 13 and the side wall of the mounting cavity 1111a, effectively prevent the electrolyte from leaking out of the mounting cavity 1111a of the negative electrode metal sealing pad 111, and welded to the negative terminal 15 located in the mounting cavity 1111a, so as to ensure that the welding point between the negative electrode ear 13 and the negative terminal 15 is located in the mounting cavity 1111a, so that the mounting cavity 1111a can play a good protective role on the welding point between the negative electrode ear 13 and the negative terminal 15, and the negative terminal 15 is partially exposed in the mounting cavity 1111a, so that the negative terminal 15 can be welded and fixed to the external connection product.

[0057] In order to realize the connection between the tab, the metal sealing pad 111 and the terminal, in one embodiment, the positive tab 12 and / or the positive tab 12 includes a connecting piece, a connecting column and a frustum 121, the frustum 121 is connected to the connecting piece through the connecting column, the top of the frustum 121 is welded to the positive terminal 14 and / or the negative terminal 15, so as to realize the welding fixation of the tab and the terminal, and the bottom of the frustum 121 is sealed and welded to the side wall of the installation cavity 1111a, so as to realize the sealing welding of the tab and the side wall of the installation cavity 1111a. In addition, the additional frustum 121 is convenient for users to assemble quickly and is also convenient for welding, that is, the welding field is further increased, and the welding quality and welding strength of the tab and the side wall of the installation cavity 1111a are effectively guaranteed.

[0058] like Figure 5 and Figure 6 As shown, the present disclosure also provides a capacitor type lithium battery 1, including the battery assembly 10 described in any of the above embodiments. The capacitor type lithium battery 1 also includes a shell 30 and a battery cell 20, the battery cell 20 is arranged in the shell 30, the sealing ring 112 of the battery assembly 10 is buckled on the opening of the shell 30 to achieve the sealing of the battery cell 20, and the positive electrode ear 12 and the negative electrode ear 13 of the battery assembly 10 are respectively connected to the battery cell 20, so that the positive electrode ear 12 and the negative electrode ear 13 can be connected to the battery cell 20, ensuring the normal operation of the capacitor type lithium battery 1.

[0059] In one embodiment, a sealing groove 31 is formed near the opening of the shell 30 so that the shell 30 and the sealing ring 112 can be well pressed and fitted together, thereby improving the connection strength between the shell 30 and the sealing ring 112 .

[0060] Compared with the prior art, the utility model has at least the following advantages:

[0061] 1) Since the pressing end of the sealing column 1111 is provided with a first clamping sealing portion 1112 and the pressing end is provided with a second clamping sealing portion 1113, and the first clamping sealing portion 1112 and the second clamping sealing portion 1113 can form a clamping sealing cavity 1114, so that the clamping sealing cavity 1114 can well clamp and fix the sealing ring 112. When in use, the metal sealing pad 111 is interference-fitted in the sealing ring 112 of the capacitor type lithium battery 1, so that the plastic ring can be well attached to the clamping sealing cavity 1114, thereby achieving close attachment of the metal sealing pad 111 and the sealing ring 112, improving the sealing performance of the connection between the metal sealing pad 111 and the sealing ring 112, and at the same time, the first clamping sealing portion 1112 can effectively prevent the electrolyte from entering the sealing ring 112 to cause corrosion of the sealing ring 112, thereby improving the service life of the capacitor type lithium battery 1. In this way, not only is the structure simple, but also the assembly efficiency is high, the cost is low, and the sealing performance is good.

[0062] 2) Since an installation cavity 1111a is formed in the sealing column 1111, and since the side wall of the installation cavity 1111a is also used for sealing and welding with the pole ear of the capacitor type lithium battery 1, on the one hand, the welding and fixation of the pole ear and the metal sealing pad 111 are realized, and on the other hand, the sealing setting of the pole ear and the metal sealing pad 111 is realized, which effectively avoids the exposure of the electrolyte. On the other hand, the installation cavity 1111a can well accommodate the welding point between the pole ear and the terminal of the capacitor type lithium battery 1, improves the protection of the welding point between the pole ear and the terminal of the capacitor type lithium battery 1, and effectively blocks the entry of part of the electrolyte, thereby improving the service life of the capacitor type lithium battery 1.

[0063] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A metal sealing pad, characterized in that: include: A sealing column, wherein a mounting cavity is formed in the sealing column, the mounting cavity is used to accommodate the welding portion between the pole ear and the terminal of the capacitor type lithium battery, and the side wall of the mounting cavity is also used for sealing and welding with the pole ear of the capacitor type lithium battery; A first clamping sealing portion, the first clamping sealing portion being arranged at a press-in end of the sealing column; A second clamping seal portion, wherein the second clamping seal portion is disposed at the pressing end of the sealing column and forms a clamping seal cavity with the first clamping seal portion, wherein the clamping seal cavity is used to clamp a sealing ring of a fixed capacitor type lithium battery.

2. The metal sealing pad according to claim 1, characterized in that: The first clamping sealing portion is disposed around the periphery of the pressing end.

3. The metal sealing pad according to claim 1, characterized in that: The second clamping sealing portion is disposed around the periphery of the pressing end.

4. The metal sealing pad according to claim 1, characterized in that: The first clamping sealing portion is protrudingly disposed on the pressing end, and the second clamping sealing portion is protrudingly disposed on the pressing end.

5. The metal sealing pad according to claim 1, characterized in that: The first clamping seal portion, the second clamping seal portion and the sealing column are an integrally formed structure; and / or, The first clamping sealing portion is a convex ring; and / or, The metal sealing pad is one of a sealed nickel pad, a sealed nickel alloy pad, a sealed aluminum pad or a sealed aluminum alloy pad; and / or, The first clamping seal portion, the sealing column and the second clamping seal portion are connected to form an inverted cone shape, the first clamping seal portion is located at the bottom of the cone, and the second clamping seal portion is located at the top of the cone; and / or, A first cavity and a second cavity are formed in the installation cavity. The first cavity is used to accommodate part of the pole lug, and the inner side wall of the first cavity is sealed and welded to the outer peripheral wall of the pole lug. The second cavity is used to accommodate the welding point between the pole lug and the terminal.

6. The metal sealing pad according to claim 1, characterized in that: A side of the second clamping sealing portion facing away from the first clamping sealing portion is formed with an outwardly expanding bell mouth, and the outwardly expanding bell mouth is communicated with the installation cavity.

7. A sealing structure, characterized in that: It comprises the metal sealing pad and sealing ring according to any one of claims 1 to 6, wherein the number of the metal sealing pads is two, namely a positive metal sealing pad and a negative metal sealing pad, and the positive metal sealing pad and the negative metal sealing pad are respectively separated and embedded in the sealing ring.

8. A battery assembly, characterized in that: The invention comprises the sealing structure as claimed in claim 7, a positive electrode ear, a negative electrode ear, a positive terminal and a negative terminal, wherein the positive electrode ear and the positive terminal are partially inserted into the mounting cavity of the positive electrode metal sealing pad, and the positive electrode ear in the mounting cavity is sealed and welded to the inner wall of the mounting cavity, and is also welded to the positive terminal in the mounting cavity, and the positive terminal is partially exposed outside the mounting cavity; The negative electrode ear and the negative terminal are partially inserted into the mounting cavity of the negative electrode metal sealing pad, and the negative electrode ear located in the mounting cavity is sealed and welded to the inner wall of the mounting cavity, and is also welded to the negative terminal located in the mounting cavity, and the negative terminal is partially exposed in the mounting cavity.

9. The battery assembly according to claim 8, characterized in that: The positive electrode ear and / or the positive electrode ear includes a connecting piece, a connecting column and a frustum, the frustum is connected to the connecting piece through the connecting column, the top of the frustum is welded to the positive terminal and / or the negative terminal, and the bottom of the frustum is sealed and welded to the side wall of the installation cavity.

10. A capacitor type lithium battery, characterized in that: A battery assembly comprising the battery assembly of claim 8 or 9.

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