Anti-corrosion cover plate assembly and secondary battery

Abstract

The utility model provides an anti-corrosion cover plate assembly and a secondary battery, and relates to the technical field of lithium ion batteries, the anti-corrosion cover plate assembly comprises a battery cover plate main body and a pole, one side of an upper plastic facing the battery cover plate main body is provided with at least one upper sealing bulge, and the side of the upper plastic facing the battery cover plate main body is provided with at least one lower sealing bulge; the upper sealing bulge is arranged along the circumferential direction of the mounting hole; and an upper sealing groove matched with the upper sealing bulge is formed in the upper end surface of the battery cover plate main body. According to the anti-corrosion cover plate assembly provided by the utility model, the upper sealing groove is formed in the upper end surface of the battery cover plate main body, the upper sealing bulge is arranged on the lower end surface of the upper plastic, and the upper sealing bulge can be inserted into the lower sealing groove, so that a gap between the upper plastic and the battery cover plate main body is favorably sealed; and the problem that after the electrolyte flows into the gap, the electrolyte remains in the gap, so that the battery cover plate main body is conducted with the upper pressing plate, the battery cover plate main body is corroded, and the battery leaks is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium ion battery especially is related to a kind of anticorrosive cover plate assembly and secondary battery. BACKGROUND

[0002] The secondary battery represented by lithium ion battery is widely applied in power and energy storage battery field with the characteristics of high energy density and long cycle life, and the aluminum shell battery in lithium ion battery is more concerned due to the advantage of low assembly cost.

[0003] The cover plate is the key structural member of the aluminum shell battery, and the positive and negative electrode pressing plate in the cover plate is generally aluminum or copper metal, and the pressing plate is connected with the roll core inside the battery through metal pole.

[0004] Generally, the negative electrode pressing plate and the pole need to be insulated from the aluminum substrate of the cover plate to prevent the short circuit of the battery cell, and the insulation strategy is generally to add plastic between the pressing plate and the substrate.

[0005] During multiple liquid injection processes, liquid injection is prone to occur outside the battery. The sprayed electrolyte can flow into the gap between the plastic and the aluminum substrate of the cover plate. The electrolyte entering the gap is difficult to clean. The electrolyte remaining in the gap causes the pressing plate and the aluminum substrate of the cover plate to conduct, eventually leading to corrosion of the aluminum substrate of the cover plate, battery leakage and safety risks. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing anticorrosive cover plate assembly and secondary battery to solve the technical problem that the gap between the battery cover plate body and the upper plastic causes battery corrosion.

[0007] The utility model provides an anticorrosive cover plate assembly, which comprises a battery cover plate body and a pole, an installation hole is arranged on the battery cover plate body, the pole comprises a pole body and a lower connecting plate arranged at the lower end of the pole body;

[0008] The pole body is arranged in the installation hole and extends out from the upper end of the battery cover plate body, an upper pressing plate is arranged on the pole body, and the upper pressing plate is located at the upper end of the battery cover plate body, and the lower connecting plate is located at the lower end of the battery cover plate body;

[0009] An upper plastic is arranged between the upper pressing plate and the battery cover plate body, and the upper plastic is sleeved on the pole body;

[0010] At least one upper sealing protrusion is arranged on the side of the upper plastic facing the battery cover plate body, and the upper sealing protrusion is arranged along the circumference of the installation hole;

[0011] An upper sealing protrusion matching groove is arranged on the upper end surface of the battery cover plate body.

[0012] In an optional embodiment, the upper plastic has an upper mounting groove, the upper pressing plate is assembled in the upper mounting groove, and an upper through hole is arranged in the upper mounting groove, and the pole body is arranged in the upper through hole.

[0013] In an optional embodiment, the pole body comprises a first pole body and a second pole body arranged in sequence from top to bottom.

[0014] The second pole body matches the mounting hole and the upper through hole.

[0015] The upper pressing plate is provided with an upper riveting hole, and the first pole body is arranged in the upper riveting hole.

[0016] In an optional embodiment, the lower end of the upper plastic is provided with two upper sealing protrusions, and the edge of the upper plastic forms an upper sealing protrusion.

[0017] In an optional embodiment, the battery cover plate body is provided with two upper plastics, and the specifications of the upper sealing protrusions arranged on the two upper plastics are different.

[0018] In an optional embodiment, a lower plastic is arranged at the lower end of the battery cover plate body, and the lower plastic is provided with a lower through hole corresponding to the mounting hole.

[0019] At least one first sealing groove is arranged on the upper end surface of the lower plastic, and a second sealing groove corresponding to the first sealing groove is arranged on the lower end surface of the battery cover plate body.

[0020] An insulating sealing ring is arranged between the first sealing groove and the second sealing groove.

[0021] In an optional embodiment, the lower connecting plate is provided with at least one lower sealing groove, and the lower plastic is provided with a lower sealing protrusion matching the lower sealing groove.

[0022] In an optional embodiment, a sealing ring is arranged on the pole body, and the sealing ring is used for sealing the gap between the mounting hole and the pole body and sealing the gap between the lower through hole and the pole body.

[0023] In an optional embodiment, the lower end of the lower plastic is provided with a lower assembly groove, and the lower through hole is arranged in the lower assembly groove.

[0024] The lower connecting plate matches the lower assembly groove.

[0025] The anti-corrosion cover assembly provided by this utility model has an upper sealing groove on the upper end surface of the battery cover body and an upper sealing protrusion on the lower end surface of the upper plastic. The upper sealing protrusion can be inserted into the lower sealing groove, which helps to seal the gap between the upper plastic and the battery cover body. This prevents electrolyte from flowing into the gap and remaining in the gap, which could cause the battery cover body to become conductive with the upper pressure plate, leading to corrosion of the battery cover body and ultimately battery leakage.

[0026] This utility model provides a secondary battery, including the anti-corrosion cover plate assembly described in any of the foregoing embodiments.

[0027] Compared with the prior art, the secondary battery provided by this utility model has the anti-corrosion cover plate assembly provided by this utility model, and thus has all the beneficial effects of the anti-corrosion cover plate assembly provided by this utility model. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 An exploded view of the anti-corrosion cover assembly provided in this embodiment of the utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the battery cover body of the corrosion-resistant cover assembly shown;

[0031] Figure 3 for Figure 2 A structural schematic diagram of the battery cover body from another angle;

[0032] Figure 4 for Figure 1 The diagram shows the structure of the lower plastic part of the corrosion-resistant cover assembly.

[0033] Figure 5 for Figure 4 The diagram shows a structural schematic of the lower plastic at another angle;

[0034] Figure 6 for Figure 1 A schematic diagram of the upper plastic structure of the corrosion-resistant cover assembly shown;

[0035] Figure 7 for Figure 1Structure diagram of the pole of the anticorrosion cover plate assembly.

[0036] Icon: 100-battery cover plate body; 101-mounting hole; 102-upper sealing groove; 103-second sealing groove; 200-upper pressing plate; 300-upper plastic; 301-upper perforation; 302-upper sealing protrusion; 400-lower plastic; 401-lower perforation; 402-first sealing groove; 403-lower assembly groove; 404-lower sealing protrusion; 500-sealing ring; 600-pole; 601-lower connecting plate; 602-second pole body; 603-first pole body; 604-lower sealing groove; 700-insulating sealing ring. DETAILED DESCRIPTION

[0037] The terms "first", "second", "third", and the like are merely used to distinguish descriptions, and do not indicate the arrangement sequence, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", "overhanging", and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the present application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In the description of the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "mounting", "connection", and "connection" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements.

[0041] The technical solutions of the present application will be described below in conjunction with the drawings.

[0042] Embodiments

[0043] Reference Figures 1-7The utility model provides a kind of anticorrosive cover plate assembly, including battery cover plate main body 100 and pole 600, installation hole 101 is provided on the battery cover plate main body 100, the pole 600 includes pole 600 main body and the lower connecting plate 601 being arranged at the lower end of pole 600 main body;

[0044] The pole 600 main body is arranged in the installation hole 101 and extends from the upper end of the battery cover plate main body 100, the upper pressing plate 200 is arranged on the pole 600 main body, and the upper pressing plate 200 is located at the upper end of the battery cover plate main body 100, and the lower connecting plate 601 is located at the lower end of the battery cover plate main body 100;

[0045] The upper plastic 300 is arranged between the upper pressing plate 200 and the battery cover plate main body 100, and the upper plastic 300 is sleeved on the pole 600 main body;

[0046] At least one upper sealing protrusion 302 is arranged on the side of the upper plastic 300 facing the battery cover plate main body 100, and the upper sealing protrusion 302 is arranged along the circumference of the installation hole 101;

[0047] An upper sealing groove 102 matched with the upper sealing protrusion 302 is arranged on the upper end surface of the battery cover plate main body 100.

[0048] In some embodiments, two poles 600 are arranged on the battery cover plate main body 100, one is a negative pole 600, and the other is a positive pole 600;Two installation holes 101 are arranged on the battery cover plate main body 100, and one pole 600 is fitted in each installation hole 101;The pole 600 main body is inserted into the installation hole 101 from the lower end surface of the battery cover plate main body 100 and extends from the upper end surface of the battery cover plate main body 100;The upper pressing plate 200 is riveted on the pole 600 main body, and the upper pressing plate 200 and the lower connecting plate 601 are located on the upper and lower sides of the battery cover plate main body 100 respectively, so that the pole 600 main body cannot be separated from the installation hole 101.

[0049] The upper plastic 300 is arranged between the upper pressing plate 200 and the battery cover plate main body 100, and the upper plastic 300 is sleeved on the pole 600 main body;

[0050] And avoid the electrolyte into the gap, electrolyte remaining in the gap, resulting in battery cover plate body 100 and the upper pressure plate 200 conduction, resulting in battery cover plate body 100 corrosion, and then lead to the battery leakage problem.

[0051] In an optional embodiment, the upper plastic 300 has an upper mounting groove, the upper pressure plate 200 is assembled in the upper mounting groove, and an upper through hole 301 is arranged in the upper mounting groove, and the pole 600 body is arranged in the upper through hole 301.

[0052] In some embodiments, the upper plastic 300 has an upper mounting groove, and the upper pressure plate 200 can be assembled in the upper mounting groove; the upper mounting groove, the upper sealing protrusion 302 and the upper sealing groove 102 are all non-circular, which is conducive to the fixation of the upper plastic 300 and the upper pressure plate 200, and avoids the rotation of the upper plastic 300 and the upper pressure plate 200, that is, the pole 600 is not easy to rotate.

[0053] Referring to Figure 7 In an optional embodiment, the pole 600 body includes a first pole body 603 and a second pole body 602 arranged in sequence from top to bottom;

[0054] The second pole body 602 matches the mounting hole 101 and the upper through hole 301;

[0055] The upper pressure plate 200 is provided with an upper riveting hole, and the first pole body 603 is arranged in the upper riveting hole.

[0056] In some embodiments, the pole 600 body is arranged on the lower connecting plate 601, the second pole body 602 of the pole 600 body is arranged on the lower connecting plate 601, and the first pole body 603 is arranged on the second pole body 602.

[0057] The second pole body 602 can be assembled in the mounting hole 101 and the upper through hole 301, the diameter of the second pole body 602 is greater than that of the first pole body 603, and the first pole body 603 is used for riveting the upper pressure plate 200.

[0058] Referring to Figure 6 In an optional embodiment, the lower end of the upper plastic 300 is provided with two upper sealing protrusions 302, and the edge of the upper plastic 300 forms the upper sealing protrusion 302.

[0059] In an optional embodiment, the battery cover plate body 100 is provided with two upper plastics 300, and the specifications of the upper sealing protrusions 302 arranged on the two upper plastics 300 are different.

[0060] In some embodiments, two upper plastics 300 are arranged on the battery cover plate body 100, and the negative pole post 600 and the positive pole post 600 are respectively arranged with one upper plastic 300; in order to ensure that the positive pole post 600 uses the upper plastic 300 corresponding to the positive pole post 600, the two upper plastics 300 are arranged with different upper sealing protrusions 302, so as to ensure that the positive pole post 600 uses the upper plastic 300 corresponding to the positive pole post 600, and the negative pole post 600 uses the upper plastic 300 corresponding to the negative pole post 600; when the upper plastic 300 corresponding to the positive pole post 600 is a weak conductive material, the positive upper plastic 300 is installed in the negative pole, so as to cause the short circuit between the negative pole and the battery cover plate body 100 and the battery corrosion.

[0061] The two upper sealing protrusions 302 are arranged on the upper plastic 300, the two upper sealing protrusions 302 are arranged concentrically, and the upper sealing protrusion 302 forms a circular rectangular shape or other non-circular shape; the two upper sealing protrusions 302 of the upper plastic 300 and the two upper sealing grooves 102 on the battery cover plate body 100 are coupled with each other, so as to play a double sealing protection role; the electrolyte sprayed during the liquid injection can be effectively prevented from entering the gap between the upper plastic 300 and the battery cover plate body 100, so as to prevent the battery corrosion.

[0062] The upper sealing protrusion 302 is a circular rectangular ring structure, and after coupling, the torsion of the pole post 600 can be increased, and the risk of the pole post 600 gas leakage and liquid leakage due to excessive torsion in the actual use process can be reduced.

[0063] Referring to Figure 4 and Figure 5 In an optional embodiment, a lower plastic 400 arranged at the lower end of the battery cover plate body 100 is further included, and the lower plastic 400 is arranged with a lower through hole 401 corresponding to the mounting hole 101;

[0064] At least one first sealing groove 402 is arranged on the upper end surface of the lower plastic 400, and a second sealing groove 103 corresponding to the first sealing groove 402 is arranged on the lower end surface of the battery cover plate body 100;

[0065] An insulating sealing ring 700 is arranged between the first sealing groove 402 and the second sealing groove 103.

[0066] In some embodiments, a lower plastic 400 is arranged at the lower end of the battery cover plate body 100, and a lower through hole 401 corresponding to the mounting hole 101 is arranged on the lower plastic 400; in order to avoid a gap between the lower plastic 400 and the battery cover plate body 100, a first sealing groove 402 is arranged on the upper end surface of the lower plastic 400, and a second sealing groove 103 is arranged on the lower end surface of the battery cover plate body 100; wherein the first sealing groove 402 and the second sealing groove 103 are arranged correspondingly, and the insulating sealing ring 700 is arranged concentrically with the mounting hole 101, the upper end of the insulating sealing ring 700 is fitted into the second sealing groove 103, and the lower end of the insulating sealing ring 700 is fitted into the first sealing groove 402, so as to seal the gap between the lower plastic 400 and the battery cover plate body 100.

[0067] In an optional embodiment, at least one lower sealing groove 604 is arranged on the lower connecting plate 601, and a lower sealing protrusion 404 matching the lower sealing groove 604 is arranged on the lower plastic 400.

[0068] Two lower sealing grooves 604 are arranged on the lower connecting plate 601, and two lower sealing protrusions 404 are arranged on the lower plastic 400, the upper coupling sealing is realized by inserting the upper sealing protrusion 302 into the lower sealing groove 604, the gap between the lower connecting plate 601 and the lower plastic, and the gap between the lower plastic and the battery cover plate body 100 are prevented from being penetrated by the electrolyte and the metal debris generated during the welding of the battery assembly, so as to prevent the conduction between the lower connecting plate 601 and the battery cover plate body 100 and prevent the corrosion of the battery.

[0069] In an optional embodiment, a sealing ring 500 is sleeved on the pole 600 body, and the sealing ring 500 is used for sealing the gap between the mounting hole 101 and the pole 600 body and sealing the gap between the lower through hole 401 and the pole 600 body.

[0070] In an optional embodiment, a lower assembly groove 403 is arranged at the lower end of the lower plastic 400, and the lower through hole 401 is arranged in the lower assembly groove 403.

[0071] The lower connecting plate 601 matches the lower assembly groove 403.

[0072] The lower assembly groove 403 is arranged on the lower plastic 400, the lower assembly groove 403 is generally a round rectangular, the lower assembly groove 403 can fix the lower connecting plate 601 and prevent the rotation of the lower connecting plate 601, and the lower sealing protrusion 404 is arranged in the lower assembly groove 403.

[0073] The battery cover plate body 100 is provided with an explosion-proof hole, an explosion-proof sheet is arranged on the lower end surface of the battery cover plate body 100, and a dust-proof sheet is arranged on the upper end surface of the battery cover plate body 100. An injection hole is arranged between the explosion-proof hole and the positive pole 600.

[0074] The upper plastic 300 is divided into a positive pole upper plastic 300 and a negative pole upper plastic 300, wherein the material of the positive pole upper plastic 300 is insulating or weakly conductive plastic, and the material of the negative pole upper plastic 300 is insulating plastic.

[0075] In order to prevent the short circuit between the roll core inside the battery and the battery cover plate body 100, an insulating lower plastic 400 needs to be arranged between the battery cover plate body 100 and the roll core. Therefore, gaps will inevitably exist between the pole 600 and the lower plastic 400, and between the lower plastic 400 and the battery cover plate body 100.

[0076] During the assembly of the lithium ion battery, the positive and negative pole tabs of the roll core are respectively ultrasonically welded with the connecting sheets on the battery cover plate body 100. During ultrasonic welding, metal dust will inevitably be generated and enter the gaps between the pole 600 and the lower plastic 400, and between the lower plastic 400 and the battery cover plate body 100. The dust will pierce the insulating lower plastic 400 and the sealing ring 500, and cause the risk of corrosion and short circuit of the battery.

[0077] At the same time, during the use of the battery, the user may place the battery on one side or even upside down. At this time, the electrolyte inside the battery and the main material dust falling off the positive and negative pole tabs will also enter the gaps between the pole 600 and the lower plastic 400, and between the lower plastic 400 and the battery cover plate body 100, and the risk of conduction between the battery cover plate body 100 and the pole 600 of the positive and negative poles of the battery will also exist, which will eventually cause corrosion of the battery and safety hazards.

[0078] By assembling the upper end of the insulating sealing ring 700 into the second sealing groove 103 and assembling the lower end of the insulating sealing ring 700 into the first sealing groove 402, the gap between the lower plastic 400 and the battery cover plate body 100 is sealed; two lower sealing grooves 604 are arranged on the lower connecting plate 601, two lower sealing protrusions 404 are arranged on the lower plastic 400, and the upper sealing protrusion 302 can be inserted into the lower sealing groove 604 to achieve upper coupling sealing.

[0079] In this way, the electrolyte is prevented from entering the gap between the pole 600, the lower plastic 400 and the battery cover plate body 100, which prevents the electrolyte from conducting the pole 600 and the battery cover plate body 100, and prevents the metal debris generated during the assembly and welding of the battery from entering the gap between the lower connecting plate 601 and the lower plastic, and between the lower plastic and the battery cover plate body 100, which causes the lower connecting plate 601 and the battery cover plate body 100 to conduct, and prevents the battery from corroding.

[0080] The utility model provides a secondary battery, including any preceding embodiment described anticorrosive cover plate subassembly.

[0081] Compared with the prior art, the secondary battery provided by the utility model has the anticorrosive cover plate subassembly provided by the utility model, thereby having all the beneficial effects of the anticorrosive cover plate subassembly provided by the utility model.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An erosion shield assembly comprising: The battery cover plate body (100) is provided with a mounting hole (101), and the pole column (600) includes a pole column (600) body and a lower connecting plate (601) arranged at the lower end of the pole column (600) body; The pole column (600) body is arranged in the mounting hole (101) and extends from the upper end of the battery cover plate body (100), the upper pressing plate (200) is arranged on the pole column (600) body and located at the upper end of the battery cover plate body (100), and the lower connecting plate (601) is located at the lower end of the battery cover plate body (100); An upper plastic (300) is arranged between the upper pressing plate (200) and the battery cover plate body (100), and the upper plastic (300) is sleeved on the pole column (600) body; At least one upper sealing protrusion (302) is arranged on the side of the upper plastic (300) facing the battery cover plate body (100), and the upper sealing protrusion (302) is arranged along the circumference of the mounting hole (101); An upper sealing groove (102) matched with the upper sealing protrusion (302) is arranged on the upper end surface of the battery cover plate body (100).

2. The corrosion-proof cover plate assembly of claim 1, wherein, The upper pressing plate (200) is assembled in the upper mounting groove, and an upper through hole (301) is arranged in the upper mounting groove, and the pole column (600) body is arranged in the upper through hole (301).

3. The corrosion-proof cover plate assembly of claim 2, wherein, The pole column (600) body includes a first pole column body (603) and a second pole column body (602) arranged in sequence from top to bottom; The second pole column body (602) is matched with the mounting hole (101) and the upper through hole (301); An upper riveting hole is arranged on the upper pressing plate (200), and the first pole column body (603) is arranged in the upper riveting hole.

4. The corrosion-proof cover plate assembly of claim 3, wherein, Two upper sealing protrusions (302) are arranged at the lower end of the upper plastic (300), and the edge of the upper plastic (300) forms an upper sealing protrusion (302).

5. The corrosion-proof cover plate assembly of claim 4, wherein, Two upper plastics (300) are arranged on the battery cover plate body (100), and the specifications of the upper sealing protrusions (302) arranged on the two upper plastics (300) are different.

6. The corrosion resistant cover plate assembly of claim 1, wherein, A lower plastic (400) is arranged at the lower end of the battery cover plate body (100), and the lower plastic (400) is provided with a lower through hole (401) corresponding to the mounting hole (101); At least one first sealing groove (402) is arranged on the upper end surface of the lower plastic (400), and a second sealing groove (103) corresponding to the first sealing groove (402) is arranged on the lower end surface of the battery cover plate body (100); An insulating sealing ring (700) is arranged between the first sealing groove (402) and the second sealing groove (103).

7. The corrosion-proof cover plate assembly of claim 6, wherein, At least one lower sealing groove (604) is arranged on the lower connecting plate (601), and a lower sealing protrusion (404) matching the lower sealing groove (604) is arranged on the lower plastic (400).

8. The corrosion-proof cover plate assembly of claim 6, wherein, A sealing ring (500) is sleeved on the main body of the pole (600), and the sealing ring (500) is used for sealing the gap between the mounting hole (101) and the main body of the pole (600) and sealing the gap between the lower through hole (401) and the main body of the pole (600).

9. The corrosion-proof cover plate assembly of claim 6, wherein, A lower assembly groove (403) is arranged at the lower end of the lower plastic (400), and the lower through hole (401) is arranged in the lower assembly groove (403). The lower connecting plate (601) matches the lower assembly groove (403).

10. A secondary battery characterized by comprising: The anticorrosion cover plate assembly of any one of claims 1-9.

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