Battery pole structure with square top cover

Abstract

According to the battery pole structure with the square top cover, in the structure, a cover plate is provided with a first mounting hole for mounting a pole; the lower plastic is mounted on the bottom surface of the cover plate, the lower plastic is provided with a second mounting hole aligned with the first mounting hole, the post terminal sequentially penetrates through the second mounting hole and the first mounting hole from bottom to top, and the lower end metal part is provided with a supporting part abutting against the ground of the lower plastic and a circular truncated cone part extending upwards from the supporting part to penetrate through the second mounting hole; the self-recovery fuse structure is arranged at the top of the bottom end metal part, the self-recovery fuse structure comprises a base body which expands when heated and particle conductive chains distributed on the base body, the particle conductive chains are disconnected along with expansion of the base body and re-linked along with restoration of the base body, and the upper end metal part is arranged at the top of the self-recovery fuse structure; the sealing ring at least surrounds the resettable fuse structure; the upper plastic sleeve is sleeved on the pole and is supported on the cover plate; and the riveting aluminum sheet is sleeved on the pole and is supported on the upper plastic. The structure can be repeatedly used, and the battery is prevented from being damaged and scrapped.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion batteries, in particular to a square top - cover battery pole - column structure. Background Art

[0002] With the rapid growth of the application of lithium - ion batteries in the fields of power and energy storage, the industry's requirements for the safety of lithium - ion batteries are also getting higher and higher. In order to avoid the safety risks caused by internal short - circuits in lithium - ion batteries, a corresponding fuse structure (fuse structure, fuse - link structure) is generally designed inside the lithium - ion battery to prevent thermal runaway caused by internal short - circuits in the battery, which may lead to battery fire and explosion. Since the fuse structure of the existing battery cells is disposable, when a large current is caused by an internal short - circuit in the battery cell, the fuse is triggered to start working and melt, resulting in an open circuit inside the entire battery cell. This process is also irreversible, leading to the scrapping of the entire battery cell and thus increasing the subsequent maintenance costs.

[0003] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present utility model. Therefore, it may contain information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a square top - cover battery pole - column structure. After an internal short - circuit in the battery, the self - restoring fuse structure starts to work and increases the resistance, disconnecting the circuit insulation. When the temperature drops, the self - restoring fuse structure resumes its conduction function, and the battery can work normally, avoiding battery damage and scrapping.

[0005] In order to achieve the above purpose, the present utility model provides the following technical solutions:

[0006] A square top - cover battery pole - column structure of the present utility model includes:

[0007] A cover plate, which is provided with a first mounting hole for mounting a pole - column;

[0008] A lower plastic, which is mounted on the bottom surface of the cover plate. The lower plastic is provided with a second mounting hole aligned with the first mounting hole;

[0009] A pole - column, which sequentially passes through the second mounting hole and the first mounting hole from bottom to top. The pole - column includes:

[0010] A lower - end metal part, which has a supporting part abutting against the bottom surface of the lower plastic and a frustum - shaped part extending upward from the supporting part to pass through the second mounting hole;

[0011] A self - restoring fuse structure, which is arranged on the top of the bottom - end metal part. The self - restoring fuse structure includes a matrix that expands when heated and particulate conductive chains distributed in the matrix. The particulate conductive chains are disconnected as the matrix expands and re - link as the matrix returns to its original state;

[0012] An upper metal part, which is arranged at the top of the self - reset fuse structure;

[0013] A sealing ring, which at least surrounds the self - reset fuse structure;

[0014] An upper plastic, which sleeves the pole and is supported on the cover plate;

[0015] A riveted aluminum sheet, which sleeves the pole and is supported on the upper plastic.

[0016] In the described square top - cover battery pole structure, the first mounting hole is a counterbore, and the counterbore has a counterbore platform adapted to the shape of the upper plastic.

[0017] In the described square top - cover battery pole structure, the bottom surface of the lower plastic is provided with a recess for accommodating the supporting part around the second mounting hole.

[0018] In the described square top - cover battery pole structure, the supporting part is a flat - plate structure.

[0019] In the described square top - cover battery pole structure, the sealing ring covers the self - reset fuse structure and at least a part of the lower metal part and the upper metal part adjacent to the self - reset fuse structure.

[0020] In the described square top - cover battery pole structure, the self - reset fuse structure is a cylindrical structure with a diameter the same as that of the frustum part.

[0021] In the described square top - cover battery pole structure, the upper metal part includes a disc structure with a diameter the same as that of the cylindrical structure and a cylinder extending upward from the disc structure.

[0022] In the described square top - cover battery pole structure, the riveted aluminum sheet is provided with a connection hole for mating with the cylinder.

[0023] In the described square top - cover battery pole structure, an expansion gap is left between the sealing ring and the self - reset fuse structure.

[0024] In the described square top - cover battery pole structure, the central axes of the first mounting hole, the second mounting hole, the pole, the sealing ring, the upper plastic and the riveted aluminum sheet are coaxial.

[0025] In the above - mentioned technical solution, a square top - cover battery pole structure provided by the present utility model has the following beneficial effects: The square top - cover battery pole structure protects the internal circuit of the battery and avoids safety risks caused by internal short - circuit of the battery; The self - reset fuse structure inside the battery top - cover pole structure can be reused, avoiding battery damage and scrapping. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments described in the present utility model. For those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a structural schematic diagram of a square top cover battery pole structure of the present utility model;

[0028] Figure 2 It is an exploded schematic diagram of a square top cover battery pole structure of the present utility model;

[0029] Figure 3 It is a cross-sectional schematic diagram of a square top cover battery pole structure of the present utility model;

[0030] Figure 4 It is Figure 3 an enlarged schematic diagram of part B of a square top cover battery pole structure of the present utility model;

[0031] Figure 5 It is a on-off schematic diagram of a self-resetting fuse structure of a square top cover battery pole structure of the present utility model;

[0032] Among them, 1 is a riveted aluminum sheet, 2 is an upper plastic, 3 is a cover plate, 4 is a lower plastic, 5 is a sealing ring, 6 is a pole, 7 is a lower end metal part, 8 is a self-resetting fuse structure, 9 is an upper end metal part, 10 is a matrix, and 11 is a particulate conductive chain. Specific embodiments

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0034] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0035] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it will not be necessary to further define and explain it in subsequent figures.

[0036] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0038] In the present utility model, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0040] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below with reference to the drawings.

[0041] As Figures 1-5 shown, in one embodiment, a square top cover battery pole structure of the present utility model includes,

[0042] A cover plate 3, which is provided with a first mounting hole for mounting a pole 6;

[0043] A lower plastic 4, which is mounted on the bottom surface of the cover plate 3, and the lower plastic 4 is provided with a second mounting hole aligned with the first mounting hole;

[0044] A pole 6, which is sequentially passed through the second mounting hole and the first mounting hole from bottom to top, and the pole 6 includes,

[0045] A lower end metal part 9, which has a supporting part abutting against the ground of the lower plastic 4 and a frustum part extending upward from the supporting part to pass through the second mounting hole,

[0046] A self - reset fuse structure 8, which is arranged on the top of the bottom - end metal part, and the self - reset fuse structure 8 includes a matrix 10 that expands when heated and particulate conductive chains 11 distributed in the matrix 10. The particulate conductive chains 11 are disconnected as the matrix expands and re - connected as the matrix returns to its original state,

[0047] An upper end metal part 7, which is arranged on the top of the self - reset fuse structure 8;

[0048] A sealing ring 5, which at least surrounds the self - reset fuse structure 8;

[0049] An upper plastic 2, which sleeves the pole 6 and is supported on the cover plate 3;

[0050] A riveted aluminum sheet 1, which sleeves the pole 6 and is supported on the upper plastic 2.

[0051] In a preferred embodiment of the square top cover battery pole structure described above, the first mounting hole is a counterbore, and the counterbore has a counterbore adapted to the shape of the upper plastic 2.

[0052] In a preferred embodiment of the square top cover battery pole structure described above, a recess for accommodating the supporting part is provided around the second mounting hole on the bottom surface of the lower plastic 4.

[0053] In a preferred embodiment of the square top cover battery pole structure described above, the supporting part is a flat plate structure.

[0054] In a preferred embodiment of the square top cover battery pole structure described above, the sealing ring 5 covers the self - reset fuse structure 8 and at least a part of the lower end metal part 9 and the upper end metal part 7 adjacent to the self - reset fuse structure 8.

[0055] In a preferred embodiment of the described square top cover battery pole structure, the self - restoring fuse structure 8 is a cylindrical structure with a diameter equal to the diameter of the frustum part.

[0056] In a preferred embodiment of the described square top cover battery pole structure, the upper metal part 7 includes a disc structure with a diameter equal to the diameter of the cylindrical structure and a cylinder extending upward from the disc structure.

[0057] In a preferred embodiment of the described square top cover battery pole structure, the riveted aluminum sheet 1 is provided with a connection hole for fitting the cylinder.

[0058] In a preferred embodiment of the described square top cover battery pole structure, an expansion gap is left between the sealing ring 5 and the self - restoring fuse structure 8.

[0059] In a preferred embodiment of the described square top cover battery pole structure, the central axes of the first mounting hole, the second mounting hole, the pole 6, the sealing ring 5, the upper plastic 2, and the riveted aluminum sheet 1 are coaxial.

[0060] In one embodiment, the middle of the pole 6 is the self - restoring fuse structure 8, which connects the metals at both ends of the pole 6. The outside is wrapped by the sealing ring 5 for insulation. The self - restoring fuse structure 8 is made of a polymer organic polymer, and after adding conductive particle materials, it is processed by a special process. At the same time, the pole 6 with the self - restoring fuse structure 8 can be at the positive extreme, or at the negative extreme, or both the positive and negative poles 6 can have this structure. The self - restoring fuse structure 8 is composed of a polymer matrix material and conductive microparticles, connecting the metals at both ends of the middle pole 6, and the outside is wrapped by the sealing ring 5 for insulation. When a short - circuit occurs inside the battery cell, the generated heat causes the matrix 10 of the polymer material to expand, and the conductive microparticles wrapped outside the matrix 10 of the polymer material will separate, thus cutting off the conductive channel of the self - restoring fuse, increasing the resistance of the self - restoring fuse, and reducing the abnormal current. When the abnormal current fault is cleared, the temperature drops, the polymer matrix material of the self - restoring fuse shrinks back to its original shape, reconnecting the conductive microparticles, the conductive channel is restored, and the resistance of the self - restoring fuse returns to its original low - resistance state. This process can be repeated multiple times.

[0061] Finally, it should be noted that the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0062] Only some exemplary embodiments of the present utility model are described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present utility model.

Claims

1. A square top cover battery pole structure, characterized in that: These include, A cover plate, which is provided with a first mounting hole for mounting a pole; A lower plastic, which is installed on the bottom surface of the cover plate, and the lower plastic is provided with a second mounting hole aligned with the first mounting hole; A pole, which is sequentially arranged in the second mounting hole and the first mounting hole from bottom to top, and the pole includes: The lower metal part has a support portion that abuts against the lower plastic floor and a truncated cone portion that extends upward from the support portion to penetrate a second mounting hole. A resettable fuse structure is provided on the top of the bottom metal part. The resettable fuse structure includes a substrate that expands due to heat and a particle conductive chain distributed on the substrate. The particle conductive chain is disconnected as the substrate expands and is reconnected as the substrate recovers to its original state. An upper metal portion, which is disposed on the top of the resettable fuse structure; A sealing ring, which at least surrounds the resettable fuse structure; The upper plastic is sleeved with the pole and supported on the cover plate; A riveted aluminum sheet is sleeved on the pole and supported on the upper plastic.

2. A square top cover battery pole structure according to claim 1, characterized in that: The first mounting hole is a countersunk hole having a sinker adapted to the shape of the upper plastic.

3. A square top cover battery pole structure according to claim 1, characterized in that: The bottom surface of the lower plastic is provided with a recess surrounding the second mounting hole to accommodate the supporting portion.

4. A square top cover battery pole structure according to claim 1, characterized in that: The supporting part is a flat plate structure.

5. The square top cover battery pole structure according to claim 1, characterized in that: The sealing ring covers the resettable fuse structure and at least a portion of a lower metal portion and an upper metal portion adjacent to the resettable fuse structure.

6. A square top cover battery pole structure according to claim 1, characterized in that: The resettable fuse structure is a cylindrical structure with a diameter equal to that of the truncated cone portion.

7. A square top cover battery pole structure according to claim 6, characterized in that: The upper metal part includes a disc structure having a diameter equal to that of the cylindrical structure and a cylinder extending upward from the disc structure.

8. A square top cover battery pole structure according to claim 7, characterized in that: The riveted aluminum sheet is provided with a connection hole matching the cylinder.

9. The square top cover battery pole structure according to claim 1, characterized in that: An expansion gap is reserved between the sealing ring and the resettable fuse structure.

10. The square top cover battery pole structure according to claim 1, characterized in that: The central axes of the first mounting hole, the second mounting hole, the pole, the sealing ring, the upper plastic and the riveted aluminum sheet are coaxial.

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