Cathode insulation structure of plastic cover plate and battery

Abstract

The utility model discloses a plastic cover plate and a cathode insulation structure of a battery, the side edge of the plastic cover plate is provided with a bending part which is folded upwards and a blocking part which is positioned on the side surface of the plastic cover plate, the blocking part is vertical to the bending part when the plastic cover plate is welded with an adapter plate, and after the plastic cover plate is welded with the adapter plate, the blocking part is vertical to the bending part. And the bending part is folded upwards and is matched with the blocking part to form a space for accommodating the switching piece, so that the switching piece is isolated from the shell through the plastic cover plate. According to the utility model, the bending part and the blocking part are arranged on the plastic cover plate and are matched with each other to effectively isolate the switching piece, so that the problem of poor insulation caused by contact between the switching piece and the shell is avoided, and the safety and the reliability of the battery are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a plastic cover and a negative electrode insulation structure for a battery. Background Technology

[0002] In batteries, insulation between the plastic cover and the battery cell is crucial. If the positive and negative terminals of the bare battery cell directly contact external metal parts or other potentially conductive materials, it can cause a short circuit, potentially leading to thermal runaway, fire, or even explosion. The insulating sheet between the plastic cover and the bare battery cell effectively blocks abnormal current conduction paths, preventing short circuits.

[0003] In existing battery negative electrode insulation structures, the plastic cover often lacks effective insulation measures, which can easily lead to contact between the adapter plate and the casing, resulting in a decrease in insulation performance. Furthermore, since the adapter plate needs to be welded to the terminal base of the plastic cover, there is a conflict between the insulation problem in the plastic cover area and the welding requirements between the adapter plate and the terminal base, making the achievement of effective negative electrode insulation complex. Utility Model Content

[0004] The purpose of this invention is to provide a plastic cover plate and a negative electrode insulation structure for the battery, so as to solve the problem of poor insulation caused by easy contact between the adapter plate and the shell in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a plastic cover and a negative electrode insulation structure for a battery. The side edge of the plastic cover is provided with an upwardly folded bending portion and a blocking portion located on the side surface of the plastic cover. The blocking portion is arranged perpendicular to the bending portion when the plastic cover is welded to the adapter piece. After welding, the bending portion folds upward and cooperates with the blocking portion to form a space for accommodating the adapter piece, so as to isolate the adapter piece from the housing through the plastic cover.

[0006] Optionally, the bending portion includes a folded portion, which is disposed on the side edge of the plastic cover plate.

[0007] Optionally, the folding part is provided with a folding clearance groove, which is located at the connection between the folding part and the side edge of the plastic cover plate.

[0008] Optionally, the folding clearance groove is inclined, and the vertical height corresponding to the folding clearance groove is not greater than the thickness of the bottom plate of the plastic cover, so that the connection between the folding part and the side edge of the plastic cover is smooth after folding.

[0009] Optionally, the bending portion further includes a locking structure, which is disposed on the folding portion and is used to connect the folding portion to the blocking portion.

[0010] Optionally, the blocking part is located at the positions corresponding to both ends of the bent part after it is folded over, and is formed by folding the ends of both sides of the connection port on the side surface of the plastic cover plate inward, for fixing the bent part.

[0011] Optionally, the blocking part is provided with a mating structure, which is used in conjunction with the locking structure to fix the bent part.

[0012] Optionally, the plastic cover is made of PP material.

[0013] Optionally, the bending angle of the bent portion is 90 degrees.

[0014] A negative electrode insulation structure for a battery includes a housing, an adapter plate, a tab, and a plastic cover plate. The plastic cover plate is connected to the tab via the adapter plate and is integrally disposed within the housing. The adapter plate includes a first part and a second part. The first part of the adapter plate is disposed inside the plastic cover plate and connected to the bottom of the inside of the plastic cover plate. The second part of the adapter plate is located outside the plastic cover plate and is in contact with the tab.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] This invention effectively isolates the adapter plate by setting a bending part and a blocking part on the plastic cover plate, thereby avoiding the insulation problem caused by the adapter plate contacting the shell and improving the safety and reliability of the battery.

[0017] Furthermore, by setting up a folding avoidance groove and a locking structure, not only is the bending effect of the bending part guaranteed, but the bending angle can also be precisely controlled. At the same time, the bending part is prevented from protruding and affecting assembly, thus improving the stability of the structure and the assembly efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall plastic cover plate in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the bent portion before bending in one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the battery structure in one embodiment of the present invention;

[0021] Figure 4 for Figure 1 A cross-sectional view of AA in the diagram;

[0022] Figure 5 for Figure 2 A magnified view of point B in the image;

[0023] Figure 6 This is a side view of a battery according to an embodiment of the present invention;

[0024] Figure 7 for Figure 6 CC section view in the image.

[0025] Reference numerals: 1. Housing; 2. Plastic cover; 3. Adapter plate; 4. Electrode; 21. Bending part; 22. Blocking part; 211. Folding part; 212. Folding clearance groove; 213. Buckle; 221. Slot. Detailed Implementation

[0026] The following is a more detailed description of a plastic cover and a negative electrode insulation structure of a battery according to the present invention, with reference to the schematic diagrams. Preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention 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 the present invention.

[0027] 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.

[0028] 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.

[0029] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. 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.

[0030] like Figures 1 to 2 As shown in the figure, this utility model embodiment proposes a plastic cover plate. The side edge of the plastic cover plate 2 is provided with an upwardly folded bending portion 21 and a blocking portion 22 located on the side surface of the plastic cover plate. The blocking portion 22 is arranged perpendicular to the bending portion 21 when the plastic cover plate 2 is welded to the adapter piece 3. After welding, the bending portion 21 is folded upward and cooperates with the blocking portion 22 to form a space for accommodating the adapter piece 3, so as to isolate the adapter piece 3 from the housing 1 through the plastic cover plate 2, thereby enhancing the insulation performance of the battery.

[0031] In this embodiment, the bending portion 21 includes a folded portion 211, which is disposed on the side edge of the plastic cover plate 2. The design of the folded portion 211 does not affect the connection between the adapter piece 3 and the plastic cover plate 2.

[0032] Specifically, the folding part 211 is provided with a folding clearance groove 212, which is located at the connection between the folding part 211 and the side edge of the plastic cover plate 2. The design of the folding clearance groove 212 can prevent the folding part 211 from interfering with the side edge of the plastic cover plate 2 during the folding process, so as to ensure the smooth progress of the folding process.

[0033] Furthermore, the folding clearance groove 212 is inclined, and the vertical height corresponding to the folding clearance groove 212 is not greater than the thickness of the bottom plate of the plastic cover plate 2, so that the connection between the folding part 211 and the side edge of the plastic cover plate 2 is smooth after folding, avoiding damage to other components during battery assembly or use.

[0034] In this embodiment, the bending portion 21 further includes a locking structure, which is disposed on the folding portion 211 and is used to connect the folding portion 211 to the blocking portion 22 after bending, so as to prevent the folding portion 211 from loosening or shifting due to external force or vibration, thereby more effectively isolating the adapter piece 3 and the housing 1 and improving the safety and reliability of the battery.

[0035] In one specific embodiment, the locking structure uses buckles 213, which are respectively provided at both ends of the folding part 211, so as to more firmly fix the folding part 211 and ensure that the folding part 211 remains stable after folding and is not easy to loosen.

[0036] In this embodiment, the blocking part 22 is located at the positions corresponding to the two ends of the bent part 21 after it is folded over, and is formed by folding the ends of the two sides of the connection port on the side surface of the plastic cover plate 2 inward, and is used to fix the bent part 21.

[0037] In a preferred embodiment, the blocking portion 22 is provided at both ends of the side surface of the plastic cover plate and is located on both sides of the adapter piece 3. The design of the blocking portion 22 can control the bending angle of the folding portion 211, thereby blocking the folding portion 211.

[0038] In another embodiment, the blocking part is provided with a mating structure, which is used in conjunction with the locking structure to fix the bent part.

[0039] More specifically, the blocking part 22 is provided with a slot 221, which works in conjunction with the buckle 213 to form a mechanical interlocking mechanism, ensuring that the bending part 21 can accurately reach the predetermined angle when bending, that is, to bend the bending part by 90 degrees.

[0040] In a preferred embodiment, the plastic cover 2 is made of PP material. PP material is an excellent electrical insulating material with high insulation strength and volume resistivity, which can effectively isolate the adapter piece 3 from the housing 1.

[0041] like Figures 3 to 7 As shown, a negative electrode insulation structure for a battery includes a housing 1, an adapter 3, a tab 4, and a plastic cover 2. The plastic cover 2 is connected to the tab 4 via the adapter 3 and is integrally disposed within the housing 1. 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.

[0042] In this embodiment, the adapter piece 3 includes a first part and a second part. The first part of the adapter piece 3 is disposed inside the plastic cover plate 2 and connected to the bottom of the plastic cover plate 2. The second part of the adapter piece 3 is located outside the plastic cover plate 2 and is in contact with the electrode tab 4.

[0043] During battery assembly, the first part of the adapter piece 3 is welded to the terminal base of the plastic cover plate, connecting it to the bottom of the plastic cover plate 2. The second part of the adapter piece 3 is then attached to the electrode tab 4, connecting the adapter piece 3 to the electrode tab 4. The adapter piece 3 is then bent, placing the plastic cover plate inside the outer casing. The bent portion 21 is bent upwards along the folding relief groove 212 until the locking structure and the mating structure can fully engage. Figure 5 As shown, in the assembled battery, the bent portion of the adapter piece 3 is isolated from the outer casing by the folded portion 211, avoiding insulation problems caused by contact between the adapter piece and the casing. At this time, the bending angle of the folded portion is 90 degrees.

[0044] In summary, by setting the bending part 21 and the blocking part 22 on the plastic cover plate, reliable insulation between the adapter piece 3 and the housing 1 is achieved; the inclined surface design of the folding clearance groove 212 ensures that the structure is flat after bending and does not affect the overall installation; the double locking design of the locking structure and the locking mechanism ensures precise control of the bending angle and improves the assembly reliability.

[0045] 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 side edge of the plastic cover plate is provided with an upwardly folded bending portion and a blocking portion located on the side surface of the plastic cover plate. The blocking portion is arranged perpendicular to the bending portion when the plastic cover plate is welded to the adapter piece. After welding, the bending portion folds upward and cooperates with the blocking portion to form a space for accommodating the adapter piece, so as to isolate the adapter piece from the housing through the plastic cover plate.

2. The plastic cover plate as described in claim 1, characterized in that, The bending portion includes a folded portion, which is disposed on the side edge of the plastic cover plate.

3. The plastic cover plate as described in claim 2, characterized in that, The folding part is provided with a folding clearance groove, which is located at the connection between the folding part and the side edge of the plastic cover plate.

4. The plastic cover plate as described in claim 3, characterized in that, The folding clearance groove is inclined, and the vertical height corresponding to the folding clearance groove is not greater than the thickness of the bottom plate of the plastic cover, so that the connection between the folding part and the side edge of the plastic cover is smooth after folding.

5. The plastic cover plate as described in claim 2, characterized in that, The bending portion further includes a locking structure, which is disposed on the folding portion and is used to connect the folding portion to the blocking portion.

6. The plastic cover plate as described in claim 1, characterized in that, The blocking part is located at the positions corresponding to both ends of the bent part after it is folded over. It is formed by folding inward from the ends of the two sides of the connection port on the side surface of the plastic cover plate, and is used to fix the bent part.

7. The plastic cover plate as described in claim 6, characterized in that, The blocking part is provided with a mating structure, which is used in conjunction with the locking structure to fix the bending part.

8. The plastic cover plate as described in claim 1, characterized in that, The plastic cover is made of PP material.

9. The plastic cover plate as described in claim 1, characterized in that, The bending angle of the bent portion is 90 degrees.

10. A negative electrode insulation structure for a battery, characterized in that, Includes a housing, an adapter plate, electrode tabs, and a plastic cover plate as described in any one of claims 1-9; The plastic cover plate is connected to the electrode tab via the adapter plate and is integrally housed within the housing. The adapter piece includes a first part and a second part. The first part of the adapter piece is disposed inside the plastic cover plate and connected to the bottom inside the plastic cover plate. The second part of the adapter piece is located outside the plastic cover plate and fits against the electrode tab.

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