Battery top cover structure and battery

Abstract

The utility model belongs to the technical field of battery accessories, and discloses a battery top cover structure and a battery. The battery top cover structure comprises a pole and a top cover piece, the top cover piece comprises a mounting hole, the pole penetrates through the mounting hole in an insulating manner, a groove is formed in the inner side wall of the mounting hole in the circumferential direction, and the groove is arranged to be capable of increasing the creepage distance between the insulating surface of the top cover piece and the pole in the horizontal direction. According to the arrangement, the distance between the inner side wall of the mounting hole and the pole can be increased due to the arrangement of the groove, so that the creepage distance between the insulating surface of the top of the top cover plate and the pole in the horizontal direction is increased, the insulating effect between the top cover plate and the pole is more obvious, and the risk of short circuit between the top cover plate and the pole is reduced. When the battery is provided with the battery top cover structure, the overall safety and reliability of the battery can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery accessories technical field especially relates to a battery top cover structure and battery. BACKGROUND

[0002] Under the background of rapid development in the field of large-scale energy storage, clean energy vehicles, people have put forward higher and higher requirements for the reliability and safety of the battery. But in the production, transportation and use process, the phenomenon of battery short circuit failure will appear, the single battery short circuit will not only affect the safety and reliability of the whole battery pack, but also will lead to the battery stop working or cause other safety problems.

[0003] At present, the polar post installation process of the battery top cover mainly adopts riveting process or welding process to install and fix the polar post on the top cover sheet, and the insulation between the polar post and the top cover sheet is realized by the upper plastic, but the product yield of the welding or riveting installation process is low, and the sealing is easy to fail. Therefore, how to manufacture a battery top cover structure that improves the insulation effect between the polar post and the top cover sheet is a technical problem to be solved in the field. SUMMARY

[0004] The utility model discloses a battery top cover structure and battery can improve the insulation effect between the polar post and the top cover sheet, thereby improving the safety and reliability of the battery use.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The battery top cover structure comprises: a polar post and a top cover sheet, the top cover sheet comprises a mounting hole, the polar post is insulated and arranged in the mounting hole, the inner side wall of the mounting hole is provided with a groove in the circumferential direction, and the groove is arranged to increase the horizontal creeping distance between the insulating surface of the top cover sheet and the polar post.

[0007] Preferably, the inner side wall of the mounting hole is arranged with a plurality of arc cross-section shape grooves in the circumferential direction in a dot matrix.

[0008] Preferably, the inner side wall of the mounting hole is arranged with a plurality of semicircular cross-section shape grooves in the circumferential direction in a dot matrix.

[0009] Preferably, the maximum horizontal distance between the groove and the outer side wall of the polar post is M, and M satisfies: 5≤M≤8mm.

[0010] Preferably, the ratio of the depth of the groove to the thickness of the top cover sheet is N, and N satisfies: 0.05≤N≤0.1.

[0011] Preferably, the polar post comprises a columnar portion and an annular flange, and the annular flange is arranged at the bottom end of the columnar portion.

[0012] The battery top cover structure further comprises an insulating lower plastic, which is located below the top cover sheet, and the insulating lower plastic comprises a connecting hole coaxially arranged in the mounting hole, the columnar part is arranged in the connecting hole, the annular flange abuts against the bottom surface of the insulating lower plastic, and an insulating protrusion is arranged at the top opening of the connecting hole, the insulating protrusion abuts against the bottom of the top cover sheet and is arranged to increase the creepage distance between the bottom of the top cover sheet and the annular flange in the vertical direction.

[0013] Preferably, the insulating lower plastic comprises a fool-proof structure for preventing the insulating lower plastic from being installed in a wrong way.

[0014] Preferably, the battery top cover structure further comprises an insulating upper plastic and a pressing block, the insulating upper plastic comprises a first ring body and a second ring body connected in a T shape, the first ring body is arranged between the top surface of the top cover sheet and the pressing block, and the second ring body is arranged between the inner side wall of the mounting hole and the outer side wall of the pole.

[0015] The pressing block is annular, and the pole is connected with the pressing block through interference fit after sequentially penetrating through the top cover sheet and the insulating upper plastic.

[0016] Preferably, the pressing block and the pole are welded.

[0017] A battery comprises a shell, a battery cell and the battery top cover structure, the battery cell is arranged in the shell, the battery top cover structure is arranged at the end of the shell, and the pole of the battery top cover structure is conductively connected with the battery cell.

[0018] The battery top cover structure provided by the embodiment comprises a pole and a top cover sheet, the top cover sheet is provided with a mounting hole, the pole is fixedly installed on the top cover sheet in a manner of penetrating through the mounting hole, and the inner side wall of the mounting hole is provided with a groove in the circumferential direction. The groove can increase the distance between the inner side wall of the mounting hole and the pole, thereby increasing the horizontal creepage distance between the top surface of the top cover sheet and the pole, making the insulation effect between the top cover sheet and the pole more obvious, reducing the risk of short circuit between the top cover sheet and the pole, and improving the use safety performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the battery top cover structure provided by the embodiment of the utility model;

[0020] Figure 2 is an exploded view of the battery top cover structure provided by the embodiment of the utility model;

[0021] Figure 3 is a top view of the battery top cover structure provided by the embodiment of the utility model;

[0022] Figure 4 is the section view along Figure 3 A-A in the figure;

[0023] Figure 5 is the section view along Figure 4 B in the figure;

[0024] Figure 6 is a structure schematic view of the top cover sheet provided by the embodiment of the utility model;

[0025] Figure 7 is the section view along Figure 6 C in the figure;

[0026] Figure 8 is a bottom view of the insulation lower plastic provided by the embodiment of the utility model.

[0027] In the figure:

[0028] 1, pole; 11, cylindrical part; 12, annular flange;

[0029] 2, top cover sheet; 21, mounting hole; 211, recess; 22, convex; 23, explosion-proof hole; 24, liquid injection hole;

[0030] 3, insulation upper plastic; 31, first ring body; 32, second ring body;

[0031] 4, pressing block;

[0032] 5, insulation lower plastic; 51, connecting hole; 52, insulation protrusion; 53, first avoiding hole; 54, second avoiding hole; 55, first fool-proof hole; 56, second fool-proof hole;

[0033] 6, explosion-proof valve assembly;

[0034] 7, sealing ring. DETAILED DESCRIPTION

[0035] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not limit the utility model. In addition, it needs to be explained that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0036] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element mutual action relation.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0037] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0038] In the description of the embodiment, the terms "on", "under", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0039] The technical scheme provided by the utility model is introduced below in combination with the drawings and specific embodiments.

[0040] According to the embodiment of the utility model, in combination with Figures 1 to 8 As shown in the figure, one aspect provides a battery top cover structure, including pole 1 and top cover sheet 2.Wherein, the top cover sheet 2 is provided with mounting hole 21, and the pole 1 is fixedly installed on the top cover sheet 2 by the way of insulating and being arranged in mounting hole 21, and the inner side wall of mounting hole 21 is provided with groove 211 along the circumferential direction.The setting of groove 211 can increase the distance between the inner side wall of mounting hole 21 and pole 1, thereby increasing the horizontal direction creepage distance between the top of top cover sheet 2 insulating surface and pole 1, so that the insulation effect between top cover sheet 2 and pole 1 is more obvious, reduces the risk of short circuit between top cover sheet 2 and pole 1, improves the use safety performance of battery.

[0041] In the embodiment, the battery top cover structure further includes insulating upper plastic 3 and pressing block 4, wherein, referring to Figure 5As shown, the upper plastic insulation 3 includes a first ring body 31 and a second ring body 32 connected in a T shape, the first ring body 31 is clamped between the top surface of the top cover sheet 2 and the pressing block 4, and the second ring body 32 is clamped between the inner side wall of the mounting hole 21 and the outer side wall of the pole 1, so that the insulation isolation of the pole 1 and the top insulation surface of the top cover sheet 2 is realized through the arrangement of the upper plastic insulation 3. Preferably, the upper plastic insulation 3 is directly injection molded by PPS (polyphenylene sulfide). The pressing block 4 is annular, and the pole 1 is connected with the pressing block 4 in a interference fit manner after sequentially penetrating through the mounting hole 21 of the top cover sheet 2 and the upper plastic insulation 3. In this way, the stability of the relative position between the pole 1 and the top cover sheet 2 can be ensured, and when the pole 1, the upper plastic insulation 3, the pressing block 4 and the top cover sheet 2 are assembled together and transported on the automatic line, the risk of the pole 1 falling from the pressing block 4 due to the shaking of the conveying mechanism can be avoided.

[0042] Further, the pole 1 and the pressing block 4 are welded, and after the conveying mechanism transports the top cover sheet 2 with the assembled pole 1 to the welding position, the automatic welding equipment is used to weld the pole 1 and the pressing block 4 along the gap therebetween, so as to completely seal the gap between the pole 1 and the pressing block 4, and ensure the air tightness and strength of the connection between the pole 1 and the pressing block 4, effectively prevent the leakage of the electrolyte in the battery, and further improve the overall sealing performance and long-term stability of the battery.

[0043] It should be noted that in the embodiment, the inner side wall of the mounting hole 21 is arranged with a plurality of arc cross-section grooves 211 in a circumferential dot matrix, preferably semicircular grooves 211. The semicircular grooves 211 not only can be quickly manufactured by stamping, but also have lower processing difficulty compared with the circular cross-section grooves 211, and the material flow direction can be effectively controlled during molding to avoid the material flowing to the top of the top cover sheet 2, thereby reducing the unevenness of the top insulation surface of the top cover sheet 2 and ensuring the close fit between the first ring body 31 of the upper plastic insulation 3 and the top cover sheet 2. Of course, in other parallel embodiments, the cross-section shape of the groove 211 can also be a half-oval cross-section shape, a half-elliptical cross-section shape, etc., and the present application is not limited thereto.

[0044] Further, in the embodiment, the maximum horizontal distance between the groove 211 and the outer side wall of the pole 1 is set as M, and M satisfies: A≥5mm, so as to ensure sufficient creepage distance and prevent the risk of electric leakage.

[0045] Further, in the embodiment, the ratio between the depth of the groove 211 and the thickness of the top cover sheet 2 is set as N, and N satisfies: 0.05≤N≤0.1. For example, N can be 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0046] If the ratio between the depth of the groove 211 and the thickness of the top cover sheet 2 is less than 0.05, the depth of the groove 211 will be too shallow, and the metal burrs remaining in the groove 211 after the groove 211 is formed by stamping will easily adhere to the surface of the insulating upper plastic 3, affecting the insulation effect; if the ratio between the depth of the groove 211 and the thickness of the top cover sheet 2 is greater than 0.1, the depth of the groove 211 will be too deep, which will to some extent cause poor material flowability during stamping, reducing the forming quality of the groove 211 and also reducing the overall strength of the top cover sheet 2. By setting the ratio between the depth of the groove 211 and the thickness of the top cover sheet 2 to be between 0.05 and 0.1, the forming quality of the groove 211 is ensured, the strength of the top cover sheet 2 is ensured, the influence of the metal burrs on the insulation effect is effectively avoided, and the overall safety and long-term stability of the battery are improved.

[0047] In addition, by setting the depth of the groove 211 to be less than the thickness of the top cover sheet 2, the potential danger of the electrolyte inside the battery penetrating to the surface of the top cover sheet 2 through the groove 211 can be effectively prevented, thereby prolonging the effective service life of the battery.

[0048] Optionally, in the present embodiment, as shown in Figure 6 , the top cover sheet 2 is a single-port structure, that is, the top cover sheet 2 is provided with only one pole 1 and one mounting hole 21, thereby simplifying the assembly process and reducing the manufacturing cost. In one embodiment, the pole 1 is a negative pole, the mounting hole 21 is located at one end of the surface of the top cover sheet 2, the negative pole passes through the mounting hole 21 and is assembled with one insulating upper plastic 3 and one pressing block 4, thereby being fixed on the top cover sheet 2; the other end of the surface of the top cover sheet 2 is provided with a convex 22, which is used as a positive pole, thereby eliminating the need to set one insulating upper plastic 3 and one pressing block 4, reducing the production cost of the entire battery top cover and simplifying the process.

[0049] It can be understood that in other parallel embodiments, the pole 1 can also be used as a positive pole, and at this time the convex 22 is set as a negative pole, which also has the effect of reducing the use of assembly parts and saving process cost.

[0050] Further, the convex 22 and the pole 1 are directly connected to the positive and negative lug groups of the battery cell respectively, eliminating the need to set positive and negative connecting sheets, which not only further reduces the cost and process flow, but also helps to enhance the energy density of the battery and improve the overall performance of the battery.

[0051] In combination with Figure 2 , Figure 5As shown, the pole 1 provided by the embodiment specifically comprises a pole body 11 and a ring-shaped flange 12, wherein the ring-shaped flange 12 is arranged at the bottom end of the pole body 11; the battery top cover mechanism further comprises an insulating lower plastic 5, which is arranged below the top cover sheet 2, and two connecting holes 51 are arranged at the two ends of the insulating lower plastic 5 respectively, one of the connecting holes 51 is coaxially arranged in the mounting hole 21, and the pole body 11 is tightly matched with the insulating lower plastic 5 after being arranged in the connecting hole 51, so as to ensure the stable fixation of the position of the pole 1 and the insulating lower plastic 5, the ring-shaped flange 12 abuts against the bottom surface of the insulating lower plastic 5, and the top opening of the other connecting hole 51 is provided with an insulating protrusion 52, which abuts against the bottom of the top cover sheet 2. In addition, the other connecting hole 51 is coaxially arranged in the convex 22, so that the positive tab group can be electrically connected to the convex 22 through the other connecting hole 51. By arranging the insulating protrusion 52, the creepage distance between the ring-shaped flange 12 and the bottom of the top cover sheet 2 in the up-down direction is increased, the risk of short circuit of the pole 1 at the ring-shaped flange 12 and the top cover sheet 2 is reduced, and the insulation safety between the pole 1 and the top cover sheet 2 is further improved.

[0052] It should be noted that the battery top cover structure provided by the embodiment further comprises an explosion-proof valve assembly 6, a liquid injection hole 24 and a sealing ring 7, wherein the explosion-proof valve assembly 6 is arranged at the middle position of the top cover sheet 2, and the explosion-proof hole 23 for mounting the explosion-proof valve assembly 6 is arranged on the top cover sheet 2, when the pressure inside the battery exceeds the safe range, the high-pressure gas can open the explosion-proof valve assembly 6 through the explosion-proof hole 23, and then be discharged outward, so as to ensure that the pressure inside the battery is within the appropriate range, and the safety of the battery is ensured; the liquid injection hole 24 is arranged on one side of the explosion-proof hole 23 and is connected with the inside of the battery, so that the electrolyte can be injected into the inside of the battery through the liquid injection hole 24. Correspondingly, the first avoiding hole 53 for the liquid injection hole 24 to pass through is arranged on the insulating lower plastic 5, and the second avoiding hole 54 for pressure relief is arranged opposite to the explosion-proof hole 23. In addition, the sealing ring 7 is clamped between the ring-shaped flange 12 and the bottom of the top cover sheet 2, the pole body 11 of the pole 1 is insulated from the top cover sheet 2 through the insulating lower plastic 5 and the sealing ring 7, and the sealing is realized through the compression of the two, so as to prevent the insulation failure caused by the entry of external liquid.

[0053] More specifically, in the embodiment, in order to prevent the insulating lower plastic 5 from being installed reversely, the insulating lower plastic 5 comprises an anti-fumble structure. One embodiment of the embodiment is that, referring to Figure 8As shown, a first anti-sleeping hole 55 and a second anti-sleeping hole 56 are arranged at two ends of the insulating lower plastic 5 respectively, the first anti-sleeping hole 55 and the second anti-sleeping hole 56 are both circular holes, and the cross-sectional area of the first anti-sleeping hole 55 is smaller than that of the second anti-sleeping hole 56; meanwhile, a first protruding column and a second protruding column with different cross-sectional areas are arranged at two ends of a clamp (not shown in the figure) used for assembling the insulating lower plastic 5 and the top cover sheet 2, and the cross-section of the first protruding column is smaller than that of the second protruding column.

[0054] Through the above arrangement, in the specific assembly process, if the first protruding column and the second protruding column at the same end can be inserted into the corresponding first anti-sleeping hole 55 and the second anti-sleeping hole 56, it indicates that the insulating lower plastic 5 is installed accurately; when the first protruding column and the second protruding column at the same end cannot be inserted into the corresponding hole, it indicates that the insulating lower plastic 5 is installed reversely, and the insulating lower plastic 5 needs to be rotated by 180° and then assembled with the top cover sheet 2. Therefore, through the above method, whether the insulating lower plastic 5 is installed accurately can be accurately and quickly judged, and the production efficiency is ensured.

[0055] According to the embodiments of the utility model, on the other hand, a battery is provided, the battery comprises a shell, an electric core and the battery top cover structure. Wherein, the electric core is arranged in the inner chamber of the shell, the battery top cover structure is arranged at the end of the shell, the pole column 1 of the battery top cover structure and the electric core are in conductive connection, thereby realizing the function of the battery charging and discharging outward. Because the mounting hole 21 of the top cover sheet 2 of the battery top cover structure is provided with the groove 211 on the side wall, the creepage distance of the top cover sheet 2 top insulating surface and the pole column 1 horizontal direction is effectively increased, thereby greatly reducing the risk of short circuit between the top cover sheet 2 and the pole column 1, thereby effectively improving the safety and reliability of the whole battery.

[0056] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Obviously, the above embodiments of the utility model are only for clear illustration of the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A battery top cover structure, characterized by, The battery top cover structure comprises a pole (1) and a top cover sheet (2), the top cover sheet (2) comprises a mounting hole (21), the pole (1) is insulated and arranged in the mounting hole (21), and the inner side wall of the mounting hole (21) is provided with a groove (211) in the circumferential direction, and the groove (211) is arranged to increase the horizontal creepage distance between the insulating surface of the top cover sheet (2) and the pole (1). The inner side wall of the mounting hole (21) is arranged with a plurality of arc cross-section grooves (211) in the circumferential direction in a dot matrix manner.

2. The battery cup structure of claim 1, wherein, The inner side wall of the mounting hole (21) is arranged with a plurality of semicircular cross-section grooves (211) in the circumferential direction in a dot matrix manner.

3. The battery cup structure of claim 2, wherein, The maximum horizontal distance between the groove (211) and the outer side wall of the pole (1) is set as M, and M satisfies: 5≤M≤8mm.

4. The battery cover structure of claim 1, wherein The ratio of the depth of the groove (211) to the thickness of the top cover sheet (2) is set as N, and N satisfies: 0.05≤N≤0.

1.

5. The battery cover structure of claim 1, wherein The pole (1) comprises a column part (11) and an annular flange (12), and the annular flange (12) is arranged at the bottom end of the column part (11).

6. The battery cup structure of claim 1, wherein, The battery top cover structure further comprises an insulating lower plastic (5), the insulating lower plastic (5) is located below the top cover sheet (2), the insulating lower plastic (5) comprises a connecting hole (51), the connecting hole (51) is coaxially arranged in the mounting hole (21), the column part (11) is arranged in the connecting hole (51), the annular flange (12) abuts against the bottom surface of the insulating lower plastic (5), and an insulating protrusion (52) is arranged at the top opening of the connecting hole (51), the insulating protrusion (52) abuts against the bottom of the top cover sheet (2), and is arranged to increase the vertical creepage distance between the bottom of the top cover sheet (2) and the annular flange (12). The insulating lower plastic (5) comprises a foolproof structure for preventing the insulating lower plastic (5) from being installed incorrectly.

7. The battery cup structure of claim 6, wherein, The battery top cover structure further comprises an insulating upper plastic (3) and a pressing block (4), the insulating upper plastic (3) comprises a first ring body (31) and a second ring body (32) connected in a T shape, the first ring body (31) is arranged between the top surface of the top cover sheet (2) and the pressing block (4), and the second ring body (32) is arranged between the inner side wall of the mounting hole (21) and the outer side wall of the pole (1).

8. The battery cover structure of any one of claims 1-7, wherein, The pressing block (4) is annular, and the pole (1) is connected to the pressing block (4) by interference fit after sequentially passing through the top cover sheet (2) and the insulating upper plastic (3). The pressing block (4) and the pole (1) are welded together.

9. The battery cup structure of claim 8, wherein, The battery top cover structure comprises a shell, a battery cell and the battery top cover structure of any one of claims 1-9, the battery cell is arranged in the shell, the battery top cover structure is arranged at the end of the shell, and the pole (1) of the battery top cover structure is conductively connected to the battery cell.

10. A battery characterized by ​

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