Battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises an insulation assembly, the insulation assembly comprises an insulation paster, an insulation sleeve and a closed sealing sleeve, the insulation paster is provided with a first avoidance through hole, the insulation sleeve is inserted in the first avoidance through hole, the closed sealing sleeve is sleeved outside the insulation sleeve, and the insulation paster is provided with a second avoidance through hole. And the first avoiding through hole abuts against the insulating patch and is used for sealing a gap between the first avoiding through hole and the insulating sleeve. According to the battery cover plate, the closed sealing sleeve abutted against the insulating patch is arranged on the outer side of the insulating sleeve, and the gap between the first avoiding through hole in the insulating patch and the insulating sleeve is sealed by the closed sealing sleeve, so that the problem that external liquid or metal impurities pass through the gap between the insulating sleeve and the insulating patch to corrode related structures of the battery cover plate is avoided; and the probability of short circuit caused by electrochemical corrosion is reduced, so that the insulativity of the battery cover plate is improved, and the safety during use is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery cover plate and battery. BACKGROUND

[0002] The battery cover plate is an important part of the lithium battery, and its structure design not only affects the basic performance of the battery, such as capacity and charge-discharge efficiency, but also directly relates to the safety and long-term reliability of the battery. The main structural components of the battery cover plate include conductive poles, aluminum plates, explosion-proof valves, and components for insulation, etc.

[0003] The components for insulation usually include an insulation sleeve wrapped outside the connecting piece for connecting the pole and the cover plate body, and an insulation patch on the outer surface of the cover plate body. The insulation patch is usually provided with a through hole for avoiding the smooth assembly of the connecting piece with the insulation sleeve, which causes a gap between the insulation patch and the insulation sleeve, and part of the cover plate body made of the aluminum plate is exposed to the outside, which causes short circuit between the exposed part and the liquid or metal impurities in the outside, and thus causes electrochemical corrosion, poor insulation, and low safety. SUMMARY

[0004] The utility model discloses a battery cover plate and battery, which has good insulation and high safety.

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

[0006] On the one hand, a battery cover plate is provided, which comprises:

[0007] An insulation assembly is provided, which comprises an insulation patch, an insulation sleeve and a closed sealing sleeve. The insulation patch is provided with a first avoiding through hole, the insulation sleeve is inserted into the first avoiding through hole, and the closed sealing sleeve is sleeved outside the insulation sleeve and abuts against the insulation patch to close the gap between the first avoiding through hole and the insulation sleeve.

[0008] Optionally, the closed sealing sleeve comprises a shielding part and a connecting part. The connecting part is connected to the insulation patch and provided with a second avoiding through hole communicating with the first avoiding through hole. The shielding part is continuously arranged around the circumferential edge of the second avoiding through hole and abuts against the outer surface of the insulation sleeve.

[0009] Optionally, the shielding part continuously arranged around the circumferential edge of the second avoiding through hole surrounds a plug-in through hole communicating with the second avoiding through hole. The insulation sleeve is inserted into the plug-in through hole, and the plug-in through hole is in interference fit with the insulation sleeve.

[0010] Optionally, a projection of the connecting portion on the insulating patch in the first direction is located within the insulating patch.

[0011] Optionally, the shielding portion is a tapered structure with an outer diameter gradually decreasing away from the connecting portion.

[0012] Optionally, the shielding portion and the connecting portion are integrally formed by an injection molding process.

[0013] Optionally, the battery cover plate further comprises a cover plate assembly, the cover plate assembly comprising a cover plate body and a pole, the pole being connected to the cover plate body and being inserted into the insulating sleeve through the cover plate body, and the insulating patch being attached to a surface of the cover plate body facing away from the pole group.

[0014] Optionally, a distance between a surface of the pole facing away from the cover plate body and a surface of the sealing sleeve facing away from the cover plate body in the first direction is H, and 0.2mm≤H≤1mm is satisfied.

[0015] Optionally, a plug-in groove is formed in the cover plate body, and a plug-in protrusion is arranged on a side of the insulating sleeve facing the cover plate body, the plug-in protrusion being inserted into the plug-in groove.

[0016] In another aspect, a battery is provided, the battery comprising a battery shell, a pole group, and the battery cover plate as claimed in any one of the preceding aspects, the battery shell and the battery cover plate jointly defining an enclosed cavity for accommodating the pole group.

[0017] The battery cover plate provided by the present application has the following beneficial effects:

[0018] The battery cover plate provided by the present application has the following beneficial effects:

[0019] The battery provided by the present application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a partial structure schematic view of the battery provided by the present application;

[0021] Figure 2 is a partial structure sectional view of the battery provided by the present application;

[0022] Figure 3 is a structure diagram of an insulating patch in a battery cover plate provided by the utility model;

[0023] Figure 4 is a structure diagram of a closed sealing sleeve in a battery cover plate provided by the utility model.

[0024] In the drawings:

[0025] 100, tab; 200, pole group; 300, battery shell;

[0026] 1, insulating assembly; 11, insulating patch; 111, first avoiding through hole; 12, insulating sleeve; 121, plug-in protrusion; 13, closed sealing sleeve; 131, shielding part; 132, connecting part;

[0027] 2, cover plate assembly; 21, cover plate body; 22, pole. DETAILED DESCRIPTION

[0028] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0029] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] Due to the gap between the insulating patch and the insulating sleeve, part of the cover plate body prepared from the light aluminum plate is exposed to the outside, which can easily cause short circuit with the outside liquid or metal impurities, thereby causing the phenomenon of electrochemical corrosion, poor insulation, and low safety.

[0033] Therefore, in order to improve the insulation of the battery cover plate and improve the safety during use, the present embodiment provides a battery cover plate.

[0034] As shown in Figures 1 to 4 , the battery cover plate comprises an insulating assembly 1, the insulating assembly 1 comprises an insulating patch 11, an insulating sleeve 12 and a sealing sleeve 13, the insulating patch 11 is provided with a first avoiding through hole 111, the insulating sleeve 12 is inserted into the first avoiding through hole 111, and the sealing sleeve 13 is sleeved outside the insulating sleeve 12 and abuts against the insulating patch 11 to close the gap between the first avoiding through hole 111 and the insulating sleeve 12.

[0035] The battery cover plate sets the sealing sleeve 13 abutting against the insulating patch 11 outside the insulating sleeve 12, the gap between the first avoiding through hole 111 of the insulating patch 11 and the insulating sleeve 12 is closed by the sealing sleeve 13, thereby avoiding the problem that the outside liquid or metal impurities corrode the structure of the battery cover plate through the gap between the insulating sleeve 12 and the insulating patch 11, reducing the probability of short circuit due to electrochemical corrosion, thereby improving the insulation of the battery cover plate and improving the safety during use.

[0036] In the present embodiment, the sealing sleeve 13 is prepared from a material with insulation and elasticity, such as plastic and the like.

[0037] Specifically, as shown in Figure 3 and Figure 4 , the sealing sleeve 13 comprises a shielding part 131 and a connecting part 132, the connecting part 132 is connected to the insulating patch 11 and is provided with a second avoiding through hole communicating with the first avoiding through hole 111, and the shielding part 131 is continuously arranged around the circumferential edge of the second avoiding through hole and abuts against the outer surface of the insulating sleeve 12.

[0038] Optionally, as shown in Figure 2 and Figure 4As shown, the shielding portion 131 continuously arranged around the circumferential edge of the second avoiding through hole encloses a plug-in through hole in communication with the second avoiding through hole, and the insulating sleeve 12 is inserted into the plug-in through hole, and the plug-in through hole is in interference fit with the insulating sleeve 12. By making the plug-in through hole in interference fit with the insulating sleeve 12, the sealed sleeve 13 and the insulating sleeve 12 are tightly attached, the gap between the sealed sleeve 13 and the insulating sleeve 12 is eliminated, and the liquid or metal impurities in the outside environment is prevented from corroding the relevant structure of the battery cover plate through the gap between the sealed sleeve 13 and the insulating sleeve 12, thereby improving the insulation of the battery cover plate and improving the safety in use. In this embodiment, since the sealed sleeve 13 is made of plastic with certain elasticity and insulation, the elastic sealed sleeve 13 and the insulating sleeve 12 can be connected by using the elasticity.

[0039] Optionally, as shown in Figure 2 and Figure 4 , the projection of the connecting portion 132 on the insulating patch 11 in the first direction is located in the insulating patch 11. By making the projection of the connecting portion 132 on the insulating patch 11 in the first direction located in the insulating patch 11, the connecting portion 132 is ensured to be completely connected with the insulating patch 11, and the contact area between the sealed sleeve 13 and the insulating patch 11 is ensured to be large enough, thereby ensuring sufficient connection strength.

[0040] Optionally, as shown in Figure 2 and Figure 4 , the shielding portion 131 is a tapered structure with the outer diameter gradually decreasing away from the connecting portion 132. By making the shielding portion 131 a tapered structure with the outer diameter gradually decreasing away from the connecting portion 132, the tapered shielding portion 131 is used to weaken the impact of external liquid and to drain the external liquid, thereby avoiding the deformation of the sealed sleeve 13 when it is impacted by liquid, resulting in a gap between the sealed sleeve 13 and the insulating sleeve 12, causing liquid to flow in, thereby causing the problem of electrochemical corrosion, and enhancing the insulation of the sealed sleeve 13.

[0041] Optionally, the shielding portion 131 and the connecting portion 132 are integrally formed by injection molding process. Since the structure of the shielding sleeve formed by the shielding portion 131 and the connecting portion 132 is relatively complicated for machining, the injection molding process is adopted to manufacture the sealed sleeve 13 formed by the shielding portion 131 and the connecting portion 132, and each formed sealed sleeve 13 has a short cycle, so that a large number of sealed sleeves 13 can be produced in a short time, and the production efficiency is high.

[0042] Optionally, the battery cover plate further comprises a cover plate assembly 2, the cover plate assembly 2 comprises a cover plate body 21 and a pole 22, the pole 22 is connected to the cover plate body 21 and is inserted into the insulating sleeve 12 through the cover plate body 21, and the insulating patch 11 is attached to the surface of the cover plate body 21 away from the pole group 200. By insulating the surface of the cover plate body away from the pole group 200 with the insulating patch 11, and insulating the end of the pole 22 that penetrates through the cover plate body 21 with the insulating sleeve 12, and by providing a sealed sleeve 13 between the insulating patch 11 and the insulating sleeve 12, the problem of corrosion of the cover plate body 21 by external liquids or metal impurities through the gap between the insulating sleeve 12 and the insulating patch 11 is avoided, the probability of short circuit due to electrochemical corrosion is reduced, the insulation of the battery cover plate is improved, and the safety during use is improved.

[0043] The connection of the cover plate body 21 and the pole 22 can be set according to the type of the battery cover plate. When the battery cover plate is a welded cover plate, the pole 22 is connected to the cover plate body 21 by a welding block. When the battery cover plate is a riveted cover plate, the pole 22 is connected to the cover plate body 21 by a riveting block. The pole group 200 is provided with a tab 100, and the tab 100 is connected to the pole 22 to achieve current drainage.

[0044] Optionally, as shown in Figure 2 and Figure 4 , the distance between the surface of the pole 22 away from the cover plate body 21 and the surface of the sealed sleeve 13 away from the cover plate body 21 in the first direction is H, and satisfies 0.2mm≤H≤1mm. By limiting the distance H between the surface of the pole 22 away from the cover plate body 21 and the sealed sleeve 13 in the first direction to satisfy 0.2mm≤H≤1mm, it is ensured that the sealed sleeve 13 does not exceed the height of the pole 22, thereby avoiding interference of the sealed sleeve 13 during connection of the pole 22.

[0045] The distance H between the surface of the pole 22 away from the cover plate body 21 and the sealed sleeve 13 in the first direction can be any value between 0.2mm and 1mm or a range between any two values, such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

[0046] Optionally, as shown in Figure 2 , the cover plate body 21 is provided with a plug-in groove, and the side of the insulating sleeve 12 facing the cover plate body 21 is provided with a plug-in protrusion 121, and the plug-in protrusion 121 is inserted into the plug-in groove. By providing the plug-in groove on the cover plate body 21 and the plug-in protrusion 121 on the insulating sleeve 12, the insulating area of the insulating sleeve 12 is increased by the cooperation of the plug-in protrusion 121 and the plug-in groove, and the insulating performance of the insulating sleeve 12 is ensured.

[0047] In the present embodiment, as shown in Figure 1 and Figure 2 A battery is also provided, which includes a battery housing 300, a pole group 200 and the battery cover plate described above, the battery housing 300 and the battery cover plate jointly form a closed cavity for accommodating the pole group 200. The battery not only improves the product quality due to the improvement of safety and insulation by applying the battery cover plate described above, but also prolongs its service life by avoiding the electrochemical corrosion phenomenon.

[0048] Obviously, the above embodiments of the present application are merely examples for clear illustration of the present application, and are not a limitation on the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery cover plate, characterized by The battery cover plate comprises: An insulation assembly comprising an insulation patch, an insulation sleeve and a sealing sleeve, the insulation patch is provided with a first avoiding through hole, the insulation sleeve is inserted into the first avoiding through hole, the sealing sleeve is sleeved outside the insulation sleeve and abuts against the insulation patch to close the gap between the first avoiding through hole and the insulation sleeve.

2. The battery cover plate of claim 1, wherein, The sealing sleeve comprises a shielding part and a connecting part, the connecting part is connected to the insulation patch and is provided with a second avoiding through hole in communication with the first avoiding through hole, the shielding part is continuously arranged around the circumferential edge of the second avoiding through hole and abuts against the outer surface of the insulation sleeve.

3. The battery cover plate of claim 2, wherein, The shielding part continuously arranged around the circumferential edge of the second avoiding through hole encloses a plug-in through hole in communication with the second avoiding through hole, the insulation sleeve is inserted into the plug-in through hole, and the plug-in through hole is in interference fit with the insulation sleeve.

4. The battery cover plate of claim 2, wherein, The projection of the connecting part on the insulation patch in the first direction is located in the insulation patch.

5. The battery cover plate of claim 2, wherein, The shielding part is a conical structure with the outer diameter gradually decreasing away from the connecting part.

6. The battery cover plate of claim 2, wherein, The shielding part and the connecting part are integrally formed by injection molding process.

7. The battery cover plate of claim 1, wherein, The battery cover plate further comprises a cover plate assembly, the cover plate assembly comprises a cover plate body and a pole, the pole is connected to the cover plate body and is inserted into the insulation sleeve through the cover plate body, and the insulation patch is attached to the surface of the cover plate body away from the pole group.

8. The battery cover plate of claim 7, wherein, The distance between the surface of the pole away from the cover plate body and the surface of the sealing sleeve away from the cover plate body in the first direction is H, and 0.2mm≤H≤1mm is satisfied.

9. The battery cover plate of claim 7, wherein, The cover plate body is provided with a plug-in groove, and the side of the insulation sleeve facing the cover plate body is provided with a plug-in protrusion, the plug-in protrusion is inserted into the plug-in groove.

10. A battery characterized by The battery comprises a battery shell, a pole group and the battery cover plate according to any one of claims 1-9, and the battery shell and the battery cover plate jointly enclose a closed cavity for accommodating the pole group.

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