Cover plate assembly and battery cell

Abstract

The utility model provides a cover plate assembly and a battery cell. The cover plate assembly comprises a cover plate body, the pole is mounted on the cover plate body; the lower plastic cement is arranged on the pole in a sleeving manner and is positioned below the cover plate body; and the at least one insulating sheet is arranged on the pole in a sleeving manner and is positioned between the lower plastic and the cover plate body and / or between the lower plastic and the pole base of the pole. According to the utility model, the insulating film sheets are arranged on one or two of the side, in contact with the cover plate body, of the lower plastic cement and the side, in contact with the pole bottom plate, of the lower plastic cement, so that after a large amount of electrolyte enters the cavity, if the cover plate body and the pole bottom plate need to be communicated, the required moving distance of the electrolyte is lengthened; even if the cover plate body is communicated with the pole bottom plate by the electrolyte, the resistance value of the resistor of the whole cathode top cover is not obviously reduced; when a small amount of electrolyte enters the cavity, the insulating film can directly block the connection between the electrolyte and the pole bottom plate or the cover plate body, so that the safety of the battery cell is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a cover plate subassembly and electric core. BACKGROUND

[0002] At present, the plastic on the negative electrode top cover of the electric core usually uses insulating material, and the resistance is usually above 500MΩ, so as to ensure the good insulation between the electric core shell and the negative electrode riveting block and prevent the aluminum shell from being corroded. In order to meet the sealing requirement of the riveting top cover, an L-shaped annular sealing ring is usually arranged around the pole, and the compression part of the L-shaped sealing ring is compressed into the cavity area formed by the cover plate body, the pole top plate and the lower plastic, so as to realize sealing. However, the problem of electrolyte entering the cavity area exists. SUMMARY

[0003] The electrolyte flowing into the cavity part will connect the cover plate body and the pole bottom plate, short-circuit the negative electrode upper plastic insulation resistance, reduce the resistance between the negative electrode riveting block and the cover plate body, easily cause the voltage abnormality of the whole positive electrode side edge of the electric core, and the aluminum shell also has a certain corrosion risk, which affects the safety of the whole electric core. In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a cover plate subassembly and electric core, so as to improve the problem that the electrolyte may flow into the remaining cavity part.

[0004] To achieve the above object and other related objects, the utility model provides a cover plate subassembly, which comprises:

[0005] A cover plate body;

[0006] A pole, which is installed on the cover plate body;

[0007] A lower plastic, which is sleeved on the pole and located below the cover plate body;

[0008] At least one insulating sheet, which is sleeved on the pole and located between the lower plastic and the cover plate body and / or between the lower plastic and the pole base of the pole.

[0009] In an embodiment of the utility model, the cover plate body is provided with a pole through hole, the pole is installed in the pole through hole, an L-shaped annular sealing ring is arranged between the pole through hole and the pole, and the diameter of the center hole of the insulating sheet is smaller than the outer diameter of the L-shaped annular sealing ring.

[0010] In an embodiment of the utility model, along the radial direction of the center hole of the insulating sheet, the distance between the center of the center hole and the outer edge of the insulating sheet is smaller than or equal to the distance between the center of the center hole and the edge of the contact surface between the lower plastic and the insulating sheet.

[0011] In an embodiment of the utility model, the minimum distance between the edge of the center hole of the insulating sheet and the outer edge of the insulating sheet is greater than or equal to 4mm.

[0012] In an embodiment of the utility model, the thickness of the insulating sheet is set between 0.033mm and 0.15mm.

[0013] In an embodiment of the utility model, the upper surface of the lower plastic and / or the recess matched with the shape of the insulating sheet is provided, and the insulating sheet is partially located in the recess.

[0014] In an embodiment of the utility model, the depth of the recess is less than the thickness of the insulating sheet.

[0015] In an embodiment of the utility model, the anti-twist structure is further provided, which is arranged on the cover plate body and is arranged along the periphery of the pole through hole on the cover plate body, one end of the anti-twist structure is located in the cover plate body, and the other end penetrates the upper plastic and extends into the pole riveting block.

[0016] In an embodiment of the utility model, the anti-twist structure is a ceramic block, and gaps exist between the cover plate body, the pole riveting block along the length direction, the width direction and the height direction of the ceramic block respectively, and the gaps are set between 0.1mm and 0.4mm.

[0017] In an embodiment of the utility model, the shape of the insulating sheet is one or more of an oval shape and a circular shape.

[0018] The utility model further provides an electric core, characterized by comprising:

[0019] A shell and an electrode assembly mounted in the shell.

[0020] The cover plate assembly is sealed and fixedly connected with the shell, and the pole of the cover plate assembly is electrically connected with the electrode assembly.

[0021] The utility model provides a cover plate assembly and an electric core, which place an insulating film sheet on one or both of the side, where the lower plastic contacts the cover plate body, and the side, where the lower plastic contacts the pole bottom plate, so that when a large amount of electrolyte enters the cavity, if the cover plate body and the pole bottom plate are connected, the distance that the electrolyte needs to move will be lengthened, and in this process, due to the increase in distance, the amount of electrolyte reaching the cavity is avoided, at least reduced, so that the resistance value of the whole negative electrode top cover will not decrease obviously; when a small amount of electrolyte enters the cavity, the insulating film sheet can directly block the electrolyte from connecting with the pole bottom plate or the cover plate body, so as to ensure the safety of the electric core. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0023] Figure 1 The structure diagram of the cover plate assembly in one embodiment of the present application.

[0024] Figure 2 The structure diagram of the cover plate assembly in another embodiment of the present application. Figure 1 The enlarged diagram of the position A in the above.

[0025] Figure 3 The structure diagram of the cover plate assembly in another embodiment of the present application.

[0026] Figure 4 The structure diagram of the cover plate assembly in another embodiment of the present application. Figure 3 The enlarged diagram of the position B in the above.

[0027] Figure 5 The structure diagram of the cover plate assembly in another embodiment of the present application.

[0028] Figure 6 The structure diagram of the cover plate assembly in another embodiment of the present application. Figure 5 The enlarged diagram of the position C in the above.

[0029] Figure 7 The structure diagram of the lower plastic in one embodiment of the present application.

[0030] Figure 8 The structure diagram of the insulation sheet in one embodiment of the present application.

[0031] Label explanation:

[0032] 10, cover plate assembly; 11, cover plate body; 12, pole; 13, lower plastic; 14, upper plastic; 15, L-shaped ring-shaped sealing ring; 121, pole bottom plate; 16, insulation sheet; 17, anti-twist structure; 18, pole riveting block. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described below through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. The present application can also be implemented or applied through other different specific embodiments, and each detail in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0034] It is to be noted that the diagrams provided in the present embodiment only schematically illustrate the basic concept of the present application, and the diagrams only show the components related to the present application, not the components in the actual implementation, and the shapes, sizes and numbers of the components in the actual implementation can be changed arbitrarily, and the layout of the components can be more complex.

[0035] In view of the defects of the prior art, it is noted that during the liquid injection and formation of the battery cell, the battery cell is in an upright state. In particular, for the battery cell with a double-pass structure, the positive electrode top cover is at the upper part, and the negative electrode top cover is at the lower part, and the inner side of the negative electrode top cover is completely in a state of being soaked in electrolyte. When the inner side of the negative electrode top cover is in the state of being soaked in electrolyte, since the cavity is not necessarily filled with the L-shaped annular sealing ring as described above, the electrolyte can flow into the remaining cavity part, and can connect the cover body and the pole column bottom plate, short-circuit the plastic insulation resistance on the negative electrode, and reduce the resistance between the negative electrode riveting block and the cover body, which can easily cause the voltage of the positive electrode side of the entire battery cell to be abnormal, and the aluminum shell can also be corroded to a certain extent, affecting the safety of the entire battery cell.

[0036] Please refer to Figures 1 to 8 The utility model provides a kind of cover plate assembly and battery cell to improve the problem that electrolyte can flow into remaining cavity part, connect cover body and pole column bottom plate, short-circuit plastic insulation resistance on negative electrode, reduce the resistance between negative electrode riveting block and cover body, which can easily cause the voltage of the positive electrode side of the entire battery cell to be abnormal, and the aluminum shell can also be corroded to a certain extent, affecting the safety of the entire battery cell, and remaining cavity part refers to the area in the cavity region formed by cover body, pole column bottom plate and lower plastic, which is not filled by the compressed part of L-shaped sealing ring around pole column. Specifically, cover plate assembly 10 includes cover body 11, pole column 12, lower plastic 13, upper plastic 14 and L-shaped annular sealing ring 15, pole column through hole is provided on cover body 11, pole column 12 is installed on cover body 11 by passing through pole column through hole, lower plastic 13 is sleeved on pole column 12 and located below cover body 11, upper plastic 14 is sleeved on pole column 12 and located above cover body 11, L-shaped annular sealing ring 15 is sleeved on pole column 12 and located between pole column through hole and pole column 12, cover body 11, pole column bottom plate 121 of pole column 12 and lower plastic 13 form a cavity region, and L-shaped annular sealing ring 15 is partially compressed and filled into the cavity region.

[0037] Please refer to Figure 1 And Figure 2As shown, in this embodiment, the cover assembly 10 further includes an insulating sheet 16, which is sleeved over the pole 12 and positioned between the cover body 11 and the lower plastic 13 to cover the remaining cavity. In this embodiment, a groove is provided on the upper surface of the lower plastic 13. The shape of the groove matches the shape of the insulating sheet 16. The insulating sheet 16 is partially located within the groove. The depth of the groove is less than the thickness of the insulating sheet 16, ensuring the accurate installation position of the insulating sheet 16 and ensuring that the insulating sheet 16 is squeezed and sealed by the lower plastic 13 and the cover body 11.

[0038] See also Figure 3 and Figure 4 As shown, in this embodiment, the insulating sheet 16 can also be sleeved on the pole 12 and disposed between the lower plastic 13 and the pole bottom plate 121 of the pole 12 to cover the remaining cavity. In this embodiment, a groove is provided on the lower surface of the lower plastic 13. The shape of the groove is adapted to the shape of the insulating sheet 16. The insulating sheet 16 is partially located in the groove. The depth of the groove is less than the thickness of the insulating sheet 16. This ensures the accuracy of the installation position of the insulating sheet 16 and also ensures that the insulating sheet 16 is squeezed by the lower plastic 13 and the pole bottom plate 121 to achieve a seal.

[0039] See also Figure 5 and Figure 6 As shown, in this embodiment, the insulating sheet 16 can also be provided between the cover body 11 and the lower plastic 13 and between the lower plastic 13 and the pole bottom plate 121 of the pole 12. Correspondingly, grooves that are adapted to the shape of the insulating sheet 16 are provided on the upper and lower surfaces of the lower plastic 13, and the depth of the groove is less than the thickness of the insulating sheet 16.

[0040] See also Figures 1 to 8 As shown, in this embodiment, the diameter of the central hole of the insulating sheet 16 is smaller than the outer diameter of the L-shaped annular sealing ring 15. This prevents the formation of gaps between the cavity, the insulating sheet 16, and the cover body 11, preventing direct inflow of electrolyte and ensuring the safety of the battery cell. In this embodiment, the shape of the insulating sheet is one or both of oval and circular, but other shapes can also be selected.

[0041] See also Figure 1As shown, in the embodiment, along the radial direction of the center hole of the insulating sheet 16, the distance between the center of the center hole and the outer edge of the insulating sheet 16 is less than or equal to the distance between the center of the center hole and the edge of the upper surface of the lower plastic 13, for example, when the insulating sheet 16 is installed between the upper surface of the lower plastic 13 and the cover plate body 11, the distance between the center of the center hole and the outer edge of the insulating sheet 16 is less than or equal to the distance between the center of the center hole and the edge of the upper surface of the lower plastic 13, and under the premise that the outer edge of the insulating sheet 16 does not exceed the edge of the lower plastic 13, the distance between the edge of the center hole and the outer edge of the insulating sheet 16 can be designed to be longer, so as to increase the length of the electrolyte to flow, thereby reducing the amount of electrolyte reaching the cavity, and even avoiding the electrolyte from reaching the cavity. In the embodiment, the minimum distance between the edge of the center hole of the insulating sheet 16 and the outer edge of the insulating sheet 16 is greater than or equal to 4 mm, so as to avoid that the distance is too small, the electrolyte communicates the distance between the cover plate body 11 and the pole column bottom plate 121 is short, and the negative electrode top cover resistance decreases greatly. Further, the thickness of the insulating sheet 16 is set to be between 0.033 mm and 0.15 mm, and the material thereof can be PP or PET, and the thickness and the material thereof can be selected as required.

[0042] As shown in the drawings, Figures 1 to 8 As shown, in the embodiment, the cover plate assembly 10 further comprises an anti-twist structure 17, which is arranged on the cover plate body 11 and is arranged along the periphery of the pole column through hole on the cover plate body 11, one end of the anti-twist structure 17 is located in the cover plate body 11, and the other end penetrates through the upper plastic 14 and extends into the pole column riveting block 18, specifically, a groove is arranged on the cover plate body 11, and a groove is correspondingly arranged on the bottom surface of the pole column riveting block 18, the two ends of the anti-twist structure 17 are located in the grooves of the cover plate body 11 and the pole column riveting block 18 respectively, and penetrate through the upper plastic 14, so as to limit the pole column 12, the upper plastic 14 and the like, and prevent them from being twisted. In the embodiment, the anti-twist structure 17 is a ceramic block, and gaps exist between the ceramic block and the cover plate body 11, the pole column riveting block 18 along the length direction, the width direction and the height direction of the ceramic block respectively, and the gaps are set to be between 0.1 mm and 0.4 mm, so as to avoid that the ceramic block is broken during the assembly of the cover plate assembly 10.

[0043] As shown in the drawings, Figures 1 to 8 As shown, the utility model further provides a battery cell, the battery cell includes a shell, an electrode assembly and the cover plate assembly 10, the top of the shell is provided with an opening, the electrode assembly is placed in the inside, the cover plate assembly 10 is closed on the opening, and is fixedly connected with the shell, and the tab of the electrode assembly is electrically connected with the pole column 12 in the cover plate assembly 10, it needs to be explained that the cover plate assembly 10 is similar or same with the cover plate assembly 10 described in the above embodiment, to avoid repetition, here will not be repeated.

[0044] The utility model provides a kind of cover plate assembly and electric core, it is placed insulating film piece in one or two of lower plastic and cover plate body contact side, lower plastic and pole column bottom plate contact side, so that when a large amount of electrolyte enters cavity, if to connect cover plate body and pole column bottom plate, electrolyte required to move distance will lengthen, due to the increase of distance in this process, it will avoid, at least reduce the amount of electrolyte reaching the cavity, so that the resistance value of whole negative electrode top cover will not have obvious drop;When a small amount of electrolyte enters cavity, insulating film piece can directly block electrolyte and pole column bottom plate or cover plate body connection, ensure the safety of electric core.

[0045] The above-described embodiments are merely used to illustrate the technical solutions of the present application, rather than limit the same; although the present application 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 of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

[0046] In addition to the technical features described in the specification, the remaining technical features are known to those skilled in the art, and to highlight the innovative features of the present application, the remaining technical features will not be described here.

Claims

1. A cover assembly, characterized by The cover plate body is provided with a pole through hole, the pole is installed in the pole through hole, an L-shaped annular sealing ring is arranged between the pole through hole and the pole, and a center hole of the insulating sheet has a diameter smaller than an outer diameter of the L-shaped annular sealing ring. In a radial direction of the center hole of the insulating sheet, a distance between a center of the center hole and an outer edge of the insulating sheet is smaller than or equal to a distance between the center of the center hole and an edge of a contact surface of the insulating sheet and the lower plastic. A minimum distance between an edge of the center hole of the insulating sheet and the outer edge of the insulating sheet is greater than or equal to 4 mm. A thickness of the insulating sheet is arranged to be between 0.033 mm and 0.15 mm. An upper surface of the lower plastic is provided with a groove matched with a shape of the insulating sheet, and the insulating sheet is partially arranged in the groove.

2. The cover plate assembly of claim 1, wherein, A depth of the groove is smaller than the thickness of the insulating sheet.

3. The cover plate assembly of claim 1, wherein, The anti-twist structure is a ceramic block, and gaps exist between the ceramic block and the cover plate body, the pole riveting block and the like in a length direction, a width direction and a height direction of the ceramic block, and the gaps are arranged to be between 0.1 mm and 0.4 mm.

4. The cover plate assembly of claim 1, wherein, The insulating sheet has one or both of an elliptical shape and a circular shape.

5. The cover plate assembly of claim 1, wherein, The cover plate body is provided with a pole through hole, the pole is installed in the pole through hole, an L-shaped annular sealing ring is arranged between the pole through hole and the pole, and a center hole of the insulating sheet has a diameter smaller than an outer diameter of the L-shaped annular sealing ring.

6. The cover plate assembly of claim 1, wherein, In a radial direction of the center hole of the insulating sheet, a distance between a center of the center hole and an outer edge of the insulating sheet is smaller than or equal to a distance between the center of the center hole and an edge of a contact surface of the insulating sheet and the lower plastic.

7. The cover plate assembly of claim 6, wherein, A minimum distance between an edge of the center hole of the insulating sheet and the outer edge of the insulating sheet is greater than or equal to 4 mm.

8. The cover plate assembly of claim 1, wherein, A thickness of the insulating sheet is arranged to be between 0.033 mm and 0.15 mm.

9. The cover plate assembly of claim 8, wherein, An upper surface of the lower plastic is provided with a groove matched with a shape of the insulating sheet, and the insulating sheet is partially arranged in the groove.

10. The cover plate assembly of claim 1, wherein, A depth of the groove is smaller than the thickness of the insulating sheet.

11. An electric cell characterized by The anti-twist structure is a ceramic block, and gaps exist between the ceramic block and the cover plate body, the pole riveting block and the like in a length direction, a width direction and a height direction of the ceramic block, and the gaps are arranged to be between 0.1 mm and 0.4 mm. The insulating sheet has one or both of an elliptical shape and a circular shape. The cover plate body is provided with a pole through hole, the pole is installed in the pole through hole, an L-shaped annular sealing ring is arranged between the pole through hole and the pole, and a center hole of the insulating sheet has a diameter smaller than an outer diameter of the L-shaped annular sealing ring. In a radial direction of the center hole of the insulating sheet, a distance between a center of the center hole and an outer edge of the insulating sheet is smaller than or equal to a distance between the center of the center hole and an edge of a contact surface of the insulating sheet and the lower plastic. A minimum distance between an edge of the center hole of the insulating sheet and the outer edge of the insulating sheet is greater than or equal to 4 mm. A thickness of the insulating sheet is arranged to be between 0.033 mm and 0.15 mm. An upper surface of the lower plastic is provided with a groove matched with a shape of the insulating sheet, and the insulating sheet is partially arranged in the groove. A depth of the groove is smaller than the thickness of the insulating sheet. The anti-twist structure is a ceramic block, and gaps exist between the ceramic block and the cover plate body, the pole riveting block and the like in a length direction, a width direction and a height direction of the ceramic block, and the gaps are arranged to be between 0.1 mm and 0.4 mm. The insulating sheet has one or both of an elliptical shape and a circular shape.

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