Cover plate with high airtight stability

Abstract

The utility model relates to a cover plate with high airtight stability. The cover plate comprises a substrate mechanism; the stop mechanism comprises a stop plate, a second liquid injection port, a plurality of second pole holes and stop structures; the stop plate is in contact with the surface of the substrate; the second liquid injection port is formed in the stop plate and corresponds to the first liquid injection port; the plurality of second pole holes are formed in the stop plate and correspond to the first pole holes; the pole columns are arranged in the first pole column holes and the second pole column holes in a one-to-one correspondence manner; the explosion-proof valve is fixed at the position of the explosion-proof opening; a plurality of insulators; each sealing ring is arranged on the corresponding pole in a sleeving manner and is positioned between the substrate and the corresponding pole; a plurality of circles of first protrusions are formed on the surface, facing the stop plate, of the base plate, and each circle of first protrusion is formed on the outer circle of the corresponding first pole hole and abuts against the corresponding sealing ring. And under the condition that higher requirements on planeness processing and assembly precision are not needed, the compression stability and reliability of the sealing ring are improved, and the safety performance of the battery is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power battery parts and relates to a battery cover plate, in particular to a battery cover plate with high airtightness stability. Background Art

[0002] Power batteries are power sources that provide power for tools, mostly referring to storage batteries or lithium batteries that provide power for electric vehicles, electric trains, electric bicycles, and golf carts. Power batteries are the core components of new energy vehicles and an important direction for future energy transformation. In recent years, with the support and promotion of preferential policies in various countries, the global electric vehicle market has shown a rapid growth trend, and Chinese electric vehicles have performed particularly well. The accelerated development of the electric vehicle industry not only leads to major changes in the automotive industry, but also promotes the continuous low-carbon transformation in the transportation field. Therefore, the safety and reliability requirements for power batteries are getting higher and higher.

[0003] The air tightness of the battery is crucial to the battery. If the cover plate leaks air or liquid during use, there will be major safety hazards. Therefore, it is particularly important to increase the stability (i.e., reliability) of the cover plate's air tightness. Usually, in the power battery industry, the air tightness of the cover plate is achieved by compressing the sealing ring, and the sealing ring compresses the two surfaces of the substrate and the pole (i.e., surface contact compression); in this way, when the contact surface is large, the flatness of the contact surface and the assembly accuracy of the installation are very high. If the accuracy is not enough, the cover plate sealing ring may be insufficiently compressed during batch processing, resulting in battery leakage and liquid leakage, which may cause safety accidents. Summary of the invention

[0004] The utility model aims to provide a battery cover plate, which can improve the stability and reliability of the sealing ring compression when the base plate and the pole are matched, so as to improve the safety performance of the battery.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a cover plate with high airtight stability, which comprises:

[0006] A substrate mechanism, the substrate mechanism comprising a substrate and an explosion-proof opening, a first liquid injection port and a plurality of first pole holes provided on the substrate;

[0007] A stopper mechanism, the stopper mechanism comprising a stopper plate in contact with the surface of the substrate, a second liquid injection port provided on the stopper plate and corresponding to the first liquid injection port, a plurality of second pole holes provided on the stopper plate and corresponding to the first pole holes, and stopper structures formed at both ends of the stopper plate;

[0008] A plurality of poles, wherein the poles are disposed in the first pole hole and the second pole hole in a one-to-one correspondence;

[0009] An explosion-proof valve, wherein the explosion-proof valve is fixed at the explosion-proof port;

[0010] A plurality of insulating members, each of the insulating members being formed between the first pole hole and the corresponding pole;

[0011] A plurality of sealing rings, each of which is sleeved on the pole and located between the substrate and the pole;

[0012] A plurality of circles of first protrusions are formed on a surface of the base plate facing the stop plate, and each circle of the first protrusions is formed on an outer circle of a corresponding first pole hole and abuts against a corresponding sealing ring.

[0013] Optimally, each of the poles includes a column and a column cap formed on the end surface of the column and having a diameter greater than the diameter of the column, and at least one circle of second protrusions is formed on the surface of the column cap, and the second protrusions abut against the corresponding sealing ring.

[0014] Furthermore, the first protrusion and the second protrusion are independently annular protrusions or arrays of spaced protrusions.

[0015] Furthermore, each of the poles further comprises at least one first annular groove formed on the circumferential surface of the column, and a first convex ring corresponding to the first annular groove is formed on the inner surface of the insulating member.

[0016] Furthermore, a second convex ring located at the edge of the first pole hole is formed on the surface of the base plate away from the stop plate, and a second ring groove matched with the second convex ring is formed on the surface of the insulating member.

[0017] Furthermore, the insulating member is formed on the pole by injection molding.

[0018] Optimally, a sealing convex ring is formed on the end surface of each sealing ring and is clamped between the insulating member and the pole.

[0019] Optimally, the stop mechanism further includes a through convex tube formed on the stop plate and corresponding to the explosion-proof opening.

[0020] Optimally, a plurality of countersunk holes are formed on the outer surface of the substrate, and the first pole holes are opened in the countersunk holes one by one.

[0021] Due to the application of the above technical scheme, the utility model has the following advantages compared with the prior art: the utility model has a cover plate with high airtight stability, by forming multiple circles of first protrusions on the surface of the substrate facing the stop plate, each circle of first protrusions is formed on the outer circle of the corresponding first pole hole and abuts against the corresponding sealing ring, so that the surface contact between the substrate and the pole is changed to a combination of surface contact and line contact, thereby improving the stability of the compressed sealing ring, and without the need for higher requirements on flatness processing and assembly accuracy, the stability and reliability of the sealing ring compression are improved, thereby further improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the cover plate with high airtightness stability of the utility model;

[0024] Figure 2 for Figure 1 BB cross-sectional view;

[0025] Figure 3 for Figure 1 A local enlarged view of point A;

[0026] Figure 4 This is another embodiment of the substrate in the cover plate with high airtightness stability of the utility model;

[0027] Figure 5 This is another embodiment of the pole in the cover plate with high airtightness stability of the utility model. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example 1

[0031] like Figures 1 to 3 The cover plate with high airtight stability shown mainly includes a matching base plate mechanism 1, a pole 2, a stop mechanism 3, a sealing ring 4, an explosion-proof valve 5 and an insulating member 6, etc.

[0032] Among them, the substrate mechanism 1 includes a substrate 11 and an explosion-proof port 13, a first liquid injection port 14 and a plurality of first pole holes 12 opened on the substrate 11. Specifically, the positions of the explosion-proof port 13, the first liquid injection port 14 and the first pole hole 12 are not limited, as long as the corresponding functions can be realized, and they can be set accordingly according to actual needs. In this embodiment, the explosion-proof port 13 is located at the center of the substrate 11; the number of the first pole holes 12 is determined according to the number of poles 2, so that the first pole holes 12 and the poles 2 need to correspond one to one to achieve matching, preferably two (can be selected according to the actual battery cover structure design, such as some special-shaped battery covers may have three, four or even more poles 2), which are respectively located at the two ends of the substrate 11 as the positive pole hole and the negative pole hole (the number of the sealing ring 4, the insulating member 6 and the second pole hole 33 is also consistent with the number of poles 2, the principle is the same as above); the first liquid injection port 14 is located in the middle of the substrate 11 and is adjacent to the explosion-proof port 13 and is arranged at intervals.

[0033] The stop mechanism 3 includes a stop plate 31 ( Figure 2 The upper surface of the stop plate 31 contacts the lower surface of the substrate 11), a second liquid injection port 32 opened on the stop plate 31 and corresponding to the first liquid injection port 14, a plurality of second pole holes 33 opened on the stop plate 31 and corresponding to the first pole hole 12, and a stop structure 34 formed at both ends of the stop plate 31 (the stop structure 34 is not the focus of this application, and is usually designed according to the structure of the battery shell, and the existing conventional ones can be adopted). Figure 2It can be seen that the first liquid injection port 14 and the second liquid injection port 32 form a complete liquid injection port; there are also two second pole holes 33, and one second pole hole 33 and one first pole hole 12 form a complete pole hole.

[0034] There are multiple poles 2, and the specific number is selected according to the structural design of the battery cover. In this embodiment, the most common two poles are used. Each pole 2 is arranged in the first pole hole 12 and the second pole hole 33 in a one-to-one correspondence. The explosion-proof valve 5 is fixed at the explosion-proof port 13 (the fixing method adopts the existing conventional method, which can be one-piece molding and then scored or stamped to obtain scratches, or welding can be used). The number of insulating members 6 is also consistent with the number of poles 2, and each insulating member 6 is formed between the first pole hole 12 and the corresponding pole 2; the insulating member 6 can be assembled between the first pole hole 12 and the corresponding pole 2 in a detachable manner, but it is more preferably formed integrally on the pole 2 by injection molding.

[0035] There are multiple sealing rings 4. In this embodiment, two of the most common ones are used. Each sealing ring 4 is sleeved on the pole 2 and is located between the substrate 11 and the pole 2, that is, the sealing ring 4 is clamped between the substrate 11 and the pole 2. Multiple circles of first protrusions 111 are formed on the surface of the substrate 11 facing the stop plate 31. Each circle of first protrusions 111 is formed on the outer circle of the corresponding first pole hole 12 and abuts against the corresponding sealing ring 4; in this embodiment, two circles are used, but it can also be set to an even number of circles, so that at least one circle of first protrusions 111 is set outside a first pole hole 12 (when a first pole hole 12 corresponds to multiple circles of first protrusions 111, the multiple circles of first protrusions 111 are arranged in sequence from the inside to the outside). There is no special requirement for the shape of the first protrusion 111, which can be a ring-shaped protrusion or an array of spaced protrusions (such as an array of dot-shaped protrusions arranged at equal intervals). The surface contact between the substrate 11 and the pole 2 is changed into a combination of surface contact and line contact, thereby improving the stability of the compression seal ring 4. Without requiring higher requirements for flatness processing and assembly accuracy, the stability and reliability of the compression of the seal ring 4 are improved, thereby further improving the safety performance of the battery.

[0036] In this embodiment, each pole 2 includes a column 21 and a column cap 22 formed on the end surface of the column 21 and having a diameter greater than that of the column 21; each pole 2 also includes at least one first annular groove 23 formed on the circumferential surface of the column 21, and a first convex ring corresponding to the first annular groove 23 is formed on the inner surface of the insulating member 6, which is conducive to improving the connection strength between the pole 2 and the insulating member 6. The stop mechanism 3 also includes a through convex tube 35 formed on the stop plate 31 (located in the middle of the stop plate 31) and corresponding to the explosion-proof opening 13, and the through convex tube 35 extends in a direction away from the substrate 11, so that the winding core of the power battery can be pressed. In addition, the internal gas of the assembled battery can flow to the explosion-proof valve 5 through the through convex tube 35. When the internal pressure reaches the threshold, the explosion-proof valve 5 opens to achieve the pressure relief function.

[0037] In this embodiment, a second convex ring 121 is formed on the surface of the substrate 11 facing away from the stop plate 31 and located at the edge of the first pole hole 12, and a second ring groove matching the second convex ring 121 is formed on the surface of the insulating member 6; a sealing convex ring 41 is formed on the end face of each sealing ring 4 and is clamped between the insulating member 6 and the pole 2; this can improve the sealing degree and firmness of the cover plate. Example 2

[0038] like Figures 4 to 5 The cover plate with high airtight stability shown is basically consistent with that in Example 1, such as each pole 2' includes a column 21' and a column cap 22' formed on the end surface of the column 21' and having a diameter larger than the diameter of the column 21' (each pole 2' also includes at least one first annular groove 23' formed on the circumferential surface of the column 21'); the substrate mechanism 1' includes a substrate 11' and an explosion-proof port 13', a first liquid injection port 14' and a plurality of first pole holes 12' opened on the substrate 11'.

[0039] The difference is that at least one circle of second protrusions 24' (one circle in the present embodiment, but when there are multiple circles of second protrusions 24', the multiple circles of second protrusions 24' can be arranged sequentially from the inside to the outside) is formed on the surface of each column cap 22' (i.e., the surface facing the substrate 11), and the second protrusions 24' also abut against the corresponding sealing ring 4 to further improve the stability of the compressed sealing ring 4. In the present embodiment, the first protrusions 111' are spaced protruding arc blocks, and the second protrusions 24' are spaced convex points. In addition, a plurality of countersunk holes 121' (the number of countersunk holes 121' is equal to the number of poles 2) are formed on the outer surface of the substrate 11 (the surface facing away from the stop plate 31), so that the first pole holes 12 are opened in the countersunk holes 121 one by one, which can be used to cooperate with the insulating member 6 to limit it.

[0040] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A cover plate with high airtight stability, comprising: A substrate mechanism, the substrate mechanism comprising a substrate and an explosion-proof opening, a first liquid injection port and a plurality of first pole holes provided on the substrate; A stopper mechanism, the stopper mechanism comprising a stopper plate in contact with the surface of the substrate, a second liquid injection port provided on the stopper plate and corresponding to the first liquid injection port, a plurality of second pole holes provided on the stopper plate and corresponding to the first pole holes, and stopper structures formed at both ends of the stopper plate; A plurality of poles, wherein the poles are disposed in the first pole hole and the second pole hole in a one-to-one correspondence; An explosion-proof valve, wherein the explosion-proof valve is fixed at the explosion-proof port; A plurality of insulating members, each of the insulating members being formed between the first pole hole and the corresponding pole; A plurality of sealing rings, each of which is sleeved on the pole and located between the substrate and the pole; The invention is characterized in that: a plurality of circles of first protrusions are formed on the surface of the substrate facing the stop plate, and each circle of the first protrusions is formed on the outer circle of the corresponding first pole hole and abuts against the corresponding sealing ring.

2. The cover plate with high airtight stability according to claim 1, characterized in that: Each of the poles includes a column and a column cap formed on the end surface of the column and having a diameter greater than the diameter of the column. At least one circle of second protrusions is formed on the surface of the column cap, and the second protrusions abut against the corresponding sealing ring.

3. The cover plate with high airtight stability according to claim 2, characterized in that: The first protrusion and the second protrusion are independently annular protrusions or an array of spaced protrusions.

4. The cover plate with high airtight stability according to claim 2, characterized in that: Each of the poles further includes at least one first annular groove formed on the circumferential surface of the column, and a first convex ring corresponding to the first annular groove is formed on the inner surface of the insulating member.

5. The cover plate with high airtight stability according to claim 2, characterized in that: A second convex ring located at the edge of the first pole hole is formed on the surface of the base plate away from the stop plate, and a second ring groove matched with the second convex ring is formed on the surface of the insulating member.

6. The cover plate with high airtight stability according to claim 1, 4 or 5, characterized in that: The insulating member is formed on the pole by injection molding.

7. The cover plate with high airtight stability according to claim 1, characterized in that: A sealing convex ring which is clamped between the insulating member and the pole is formed on the end surface of each sealing ring.

8. The cover plate with high airtight stability according to claim 1, characterized in that: The stop mechanism further includes a through convex tube formed on the stop plate and corresponding to the explosion-proof opening.

9. The cover plate with high airtight stability according to claim 1, characterized in that: A plurality of countersunk holes are formed on the outer surface of the substrate, and the first pole holes are opened in the countersunk holes one by one.

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