Plastic cover plate and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a plastic cover plate and a battery. According to the plastic cover plate, the containing groove is formed in the plastic cover plate, the avoiding notch is formed in one side of the containing groove, the avoiding notch is used for avoiding a switching piece of a battery, the connecting part is arranged at the bottom of the avoiding notch, and the connecting part is used for being fixedly connected with a battery cell insulation piece of the battery in a hot melting mode. The plastic cover plate disclosed by the utility model is applied to the battery, when the plastic cover plate is used, the connecting part is arranged at the position of the avoiding notch, the avoiding hole is formed in the switching piece of the battery, the welding of the switching piece and a pole base of the battery is not influenced, and the connecting part can be fixedly connected with a battery core insulating piece of the battery in a hot melting manner, so that the insulating property of the connecting part can be improved; the short circuit is prevented, the safety of the battery cell is ensured, and meanwhile, the plastic cover plate can be more firmly fixed in the shell of the battery.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a plastic cover and a battery. Background Technology

[0002] In lithium batteries, using insulating sheets to insulate the plastic cover from the battery cell is a crucial design element.

[0003] If the positive and negative terminals of a bare battery cell come into direct contact with external metal parts or other potentially conductive materials, a short circuit will occur. The insulating sheet between the plastic and the bare battery cell can effectively block abnormal current conduction paths and prevent short circuits from happening.

[0004] In existing technologies, such as Figure 1 and Figure 2 As shown, the battery includes a casing 10, a battery cell, an adapter plate, a plastic cover, and electrode tabs. Because the adapter plate needs to be welded to the electrode post base 41 of the plastic cover, and the bottom of the adapter plate is flush with the upper side of the plastic cover, a notch needs to be provided on one side of the plastic cover to avoid the adapter plate. However, this results in one side of the plastic cover not aligning with the battery cell insulation sheet on the casing after the adapter plate and plastic cover are flipped and installed in place, causing discrepancies at the corresponding positions (i.e.,...). Figure 2 The non-meltable area 60 shown in the figure cannot be fused with the plastic cover. The non-notch position of the plastic cover is the meltable area 70, where fusion can be performed. This reduces the insulation capability of the lithium battery casing 10 in the non-meltable area 60, and the plastic cover cannot be properly secured. Utility Model Content

[0005] The purpose of this invention is to provide a plastic cover and a battery to improve the insulation capability of the battery casing.

[0006] To solve the above-mentioned technical problems, this utility model provides a plastic cover and a battery.

[0007] The present invention relates to a plastic cover plate, wherein the plastic cover plate is provided with a receiving groove, and one side of the receiving groove has an avoidance notch, the avoidance notch is used to avoid the adapter piece of the battery, and the bottom of the avoidance notch is provided with a connecting part, the connecting part is used to be heat-fused and fixedly connected with the insulating sheet of the battery cell.

[0008] Furthermore, there are two connecting portions arranged at intervals.

[0009] Furthermore, the other side of the receiving groove has a side plate, and the connecting part is a convex plate parallel to the side plate.

[0010] Furthermore, a reinforcing rib is provided on the side of the convex plate adjacent to the side plate.

[0011] Furthermore, the bottom of the receiving groove is provided with multiple supporting protrusions, and the reinforcing rib on one side of the protrusion plate is integrally formed with one of the adjacent supporting protrusions.

[0012] Furthermore, the convex plate and the plastic cover plate are integrally formed.

[0013] Furthermore, the bottom of the receiving groove is provided with an installation groove surrounded by a plurality of the supporting protrusions, and an pole base is provided in the installation groove.

[0014] Furthermore, the thickness of the connecting portion is less than the width of the clearance hole.

[0015] This utility model also provides a battery, including a casing, a cell insulating sheet, a cell, an adapter sheet, a tab, and a plastic cover plate as described in any one of the above technical solutions;

[0016] The plastic cover plate is disposed inside the housing, and the battery cell insulating sheet is disposed inside the housing;

[0017] The adapter plate includes a first part and a second part. The first part of the adapter plate is fixed to the bottom of the receiving groove. The clearance notch is used to avoid the second part of the adapter plate. The second part of the adapter plate is in contact with the electrode tab.

[0018] The adapter plate is provided with a clearance hole to avoid the connection part, and the connection part is thermally fused to the battery cell insulation sheet.

[0019] Furthermore, the side of the second portion of the connecting part near the adapter piece has a clearance gap between it and the wall of the adjacent clearance hole, and the clearance gap is greater than the height of the connecting part.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The plastic cover of this utility model is used in batteries. During use, the connecting part is set at the position of the clearance notch, and the battery adapter is provided with clearance holes, which will not affect the welding of the adapter and the battery terminal base. The connecting part can be heat-fused and fixedly connected to the battery cell insulation sheet. The heat-fused position is the heat-fusible area, which can increase the insulation performance at this point, prevent short circuits, ensure the safety of the cell, and at the same time make the plastic cover more firmly fixed in the battery casing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a battery in the prior art;

[0023] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of the plastic cover plate in one embodiment of the battery of this utility model;

[0025] Figure 4 for Figure 3 A structural schematic diagram of the plastic cover plate from another perspective;

[0026] Figure 5 for Figure 3 A schematic diagram of the structure of the plastic cover plate in the housing when it is not installed in the housing and is in conjunction with the adapter plate;

[0027] Figure 6 This is a schematic diagram of the structure of a battery according to one embodiment of the present invention;

[0028] Figure 7 for Figure 6 Cross-sectional view of the battery's BB (Brain Block);

[0029] Figure 8 for Figure 7 A magnified view of point C in the image;

[0030] Figure 9 A structural schematic diagram of the battery in cell 6 from another perspective;

[0031] Figure 10 for Figure 9 A magnified view of point D in the image.

[0032] Figure label:

[0033] 10. Housing; 20. Battery cell; 30. Adapter piece; 31. First part; 32. Second part; 33. Clearance hole;

[0034] 40. Plastic cover plate; 41. Pole post base; 42. Connecting part; 43. Side plate; 44. Reinforcing rib; 45. Supporting protrusion;

[0035] 50. Polar ear;

[0036] 60. Areas that cannot be heat-fused;

[0037] 70. Heat-fusible area. Detailed Implementation

[0038] The plastic cover and battery of this utility model will be described below with reference to the schematic diagrams, which illustrate preferred embodiments of this utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit this utility model.

[0039] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly.

[0042] For example, a "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the term "electrical connection" can refer to a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0043] The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0044] The following is in conjunction with the instruction manual appendix. Figure 3 To be continued Figure 10 This paper introduces the battery of this utility model.

[0045] In one of the implementations, such as Figure 2 , Figure 6 , Figure 7 and Figure 8As shown, the battery includes a casing 10, a cell 20, an adapter plate 30, a plastic cover 40, and tabs 50. The battery can be a lithium battery, specifically a lithium-ion battery, a lithium polymer battery, a lithium iron phosphate battery, or a ternary lithium battery. In other embodiments, the battery can also be a nickel-zinc battery, a silver-zinc battery, or other batteries incorporating the above-described structure.

[0046] The plastic cover plate 40 is disposed inside the housing 10, and the housing 10 is provided with a battery cell insulating sheet. The battery cell insulating sheet is used to block abnormal current conduction paths and avoid short circuits.

[0047] like Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the plastic cover plate 40 is provided with a receiving groove, in which an electrode base 41 is disposed. The adapter piece 30 includes a first part 31 and a second part 32. The first part 31 of the adapter piece 30 is fixed to the bottom of the receiving groove and welded to the electrode base 41. One side of the receiving groove has a clearance notch to avoid the second part 32 of the adapter piece 30. The second part 32 of the adapter piece 30 fits against the electrode tab 50. The clearance notch is for avoiding the adapter piece 30 so that the adapter piece 30 can be welded to the electrode base 41.

[0048] like Figure 3 , Figure 9 and Figure 10 As shown, a connecting part 42 is provided at the bottom of the clearance notch, and a clearance hole 33 is provided on the adapter plate 30 to avoid the connecting part 42. The connecting part 42 is thermally fused to the battery cell insulation sheet. The connecting part 42 is located at the clearance notch, and the adapter plate 30 is provided with a clearance hole 33, which will not affect the welding of the adapter plate 30 and the electrode base 41. The connecting part 42 can be thermally fused to the battery cell insulation sheet. The thermal fusion location is the thermally fusible area 70, which can increase the insulation performance at this location, prevent short circuits, ensure the safety of the battery cell 20, and also make the plastic cover plate 40 more firmly fixed in the housing 10.

[0049] In one embodiment, to further improve insulation performance, preferably, there are two connecting portions 42 arranged at intervals, and two clearance holes 33 are also provided, each corresponding to one of the two connecting portions 42. In other embodiments, three or four connecting portions 42 may be provided, and of course, the number of clearance holes 33 can be adjusted accordingly.

[0050] In one embodiment, to further improve insulation performance and reduce processing costs, the other side of the receiving groove has a side plate 43, and the connecting portion 42 is a protruding plate parallel to the side plate 43. Both the side plate 43 and the protruding plate can be thermally fused to the corresponding battery cell insulation sheet. The side plate 43 and the protruding plate are parallel plate structures, which facilitates processing. In other embodiments, the connecting portion 42 can also be a cuboid protrusion, a cube protrusion, or a cylindrical protrusion.

[0051] Before installing the plastic cover 40 into the housing 10, such as Figure 5 As shown, the adapter plate 30 has a flat, plate-like structure. The first part 31 of the adapter plate 30 is fixed to the bottom of the receiving groove and welded to the pole base 41. The connecting part 42 passes through the clearance hole 33 on the adapter plate 30, thereby ensuring that the adapter plate 30 can fit against the bottom of the receiving groove of the plastic cover plate 40. The opening of the receiving groove of the plastic cover plate 40 is turned downwards and moved into the inner cavity of the housing 10. Then, the second part 32 of the adapter plate 30 is bent so that the second part 32 of the adapter plate 30 fits against the pole tab 50. The connecting part 42 is then heat-fused and fixedly connected to the battery cell insulation sheet. At the same time, the corresponding position on the side plate 43 is also heat-fused and fixedly connected to the battery cell insulation sheet, thereby increasing the insulation performance at this point, preventing short circuits, ensuring the safety of the battery cell 20, and also making the plastic cover plate 40 more firmly fixed in the housing 10.

[0052] During the heat-fusion process of connecting part 42 and the battery cell insulation sheet, the location of connecting part 42 will be subjected to a certain pressure. To improve the heat-fusion effect, a reinforcing rib 44 is provided on the side of the protruding plate adjacent to the side plate 43. The reinforcing rib 44 can improve the structural strength of the protruding plate location, making the protruding plate less likely to be damaged during the heat-fusion process. When the connecting part 42 is a cuboid protrusion, a cube protrusion, or a cylindrical protrusion, the connecting part 42 itself has strong structural strength, and in this case, the reinforcing rib 44 is not required.

[0053] In one embodiment, to improve the structural strength of the plastic cover plate 40, the bottom of the receiving groove is provided with multiple supporting protrusions 45, and the reinforcing rib 44 on one side of the protrusion plate is integrally formed with the supporting protrusions 45 at the bottom of the receiving groove. The supporting protrusions 45 not only improve the structural strength of the plastic cover plate 40, but also support the adapter piece 30. Integrating the reinforcing rib 44 on one side of the protrusion plate with the supporting protrusions 45 at the bottom of the receiving groove also further improves the structural strength of the connecting portion 42.

[0054] Furthermore, in one embodiment, in order to reasonably arrange the pole base 41, the bottom of the receiving groove is provided with an installation groove surrounded by a plurality of the supporting protrusions 45, the installation groove is provided with the pole base 41, and the pole base 41 is fixedly connected to the first part 31 of the adapter piece 30.

[0055] Furthermore, for ease of processing, the convex plate and the plastic cover plate 40 are integrally formed. Specifically, the convex plate and the plastic cover plate 40 can be integrally formed by injection molding.

[0056] Since the adapter plate 30 needs to be bent to fit against the tab 50 during the installation of the plastic cover plate 40 and the adapter plate 30 into the housing 10, in order to prevent the adapter plate 30 from being blocked by the connecting part 42 during bending, preferably, the thickness of the connecting part 42 is less than the width of the clearance hole 33 to prevent the adapter plate 30 from flipping. Specifically, there is a gap between the side of the second portion 32 of the connecting part 42 near the adapter plate 30 and the wall of the adjacent clearance hole 33, and this clearance gap is greater than the height of the connecting part 42.

[0057] This utility model also provides a plastic cover plate, which has the same structure as the plastic cover plate in any one of the above-described battery technical solutions, and will not be described again here.

[0058] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A plastic cover, characterized in that, The plastic cover plate is provided with a receiving groove, and one side of the receiving groove has an avoidance notch. The avoidance notch is used to avoid the adapter piece of the battery. The bottom of the avoidance notch is provided with a connecting part, which is used to be heat-fused and fixedly connected to the battery cell insulation sheet.

2. The plastic cover plate according to claim 1, characterized in that, There are two connecting parts, which are arranged at intervals.

3. The plastic cover plate according to claim 1, characterized in that, The other side of the receiving groove has a side plate, and the connecting part is a convex plate parallel to the side plate.

4. The plastic cover plate according to claim 3, characterized in that, The convex plate is provided with a reinforcing rib on the side adjacent to the side plate.

5. The plastic cover plate according to claim 4, characterized in that, The bottom of the receiving groove is provided with multiple supporting protrusions, and the reinforcing rib on one side of the protrusion plate is integrally formed with one of the adjacent supporting protrusions.

6. The plastic cover plate according to claim 5, characterized in that, The convex plate and the plastic cover plate are integrally formed.

7. The plastic cover plate according to claim 5, characterized in that, The bottom of the receiving groove is provided with an installation groove formed by multiple supporting protrusions, and an pole base is provided in the installation groove.

8. A battery, characterized in that, Includes a housing, a cell insulating sheet, a cell, an adapter plate, a tab, and a plastic cover plate as described in any one of claims 1 to 7; The plastic cover plate is disposed inside the housing, and the battery cell insulating sheet is disposed inside the housing; The adapter plate includes a first part and a second part. The first part of the adapter plate is fixed to the bottom of the receiving groove. The clearance notch is used to avoid the second part of the adapter plate. The second part of the adapter plate is in contact with the electrode tab. The adapter plate is provided with a clearance hole to avoid the connection part, and the connection part is thermally fused to the battery cell insulation sheet.

9. The battery according to claim 8, characterized in that, The thickness of the connecting part is less than the width of the clearance hole to prevent the adapter piece from flipping.

10. The battery according to claim 8, characterized in that, The side of the second part of the connecting portion near the adapter piece has a clearance gap between it and the wall of the adjacent clearance hole, and the clearance gap is greater than the height of the connecting portion.

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