Single cover plate with high welding yield

Abstract

The utility model relates to a single cover plate with high welding quality rate, which comprises a cover body assembly, the cover body assembly at least comprises a cover plate, the outer surface of the cover plate is provided with a sinking groove, and the sinking groove is provided with a liquid injection hole penetrating through the cover plate; the sealing nail comprises a nail body and a nail cap, the nail body is inserted into the liquid injection hole and matched with the liquid injection hole, the nail cap is formed at the end of the nail body and fixed in the sinking groove, and the diameter of the nail cap is larger than that of the liquid injection hole and smaller than that of the sinking groove. The screw cap of the sealing screw can be lapped on the sinking groove to be fixed, so that the requirement on the dimensional tolerance of the liquid injection hole is very low, the assemblability of the sealing screw is improved, the welding yield of the sealing screw is improved, and the waste of battery production is reduced.

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 single body cover plate with high welding quality rate. Background Art

[0002] Power batteries are the core components of new energy vehicles and an important direction for future energy transformation. 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 of the transportation sector. Therefore, major car manufacturers have continuously increased their requirements for the safety level and cost control of power batteries. The poor production caused by residual electrolyte after the battery filling port and the explosion point of the sealing pin welding has caused a lot of waste and increased costs; the battery filling port sealing pin welding is the last welding process in battery production. If a good solution can be provided, it can not only reduce production costs, but also greatly increase battery shipments and enhance the competitiveness of enterprises.

[0003] In the power battery industry, the traditional splicing welding method is usually used when welding the battery filling port and the sealing pin. Splicing welding has very high requirements on the dimensional tolerance of the filling port, which makes it difficult to ensure the consistency of parts; it leads to assembly interference and poor welding points in mass production welding. Summary of the invention

[0004] The utility model aims to provide a single cover plate with high welding quality, so as to reduce the size tolerance requirement of the injection hole, improve the assemblability of the sealing nail, improve the welding yield of the sealing nail and reduce the waste of battery production.

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

[0006] A cover assembly, the cover assembly at least comprising a cover plate, a recessed groove is formed on the outer surface of the cover plate, and a liquid injection hole is formed at the recessed groove and penetrates the cover plate;

[0007] The sealing nail comprises a nail body inserted into the injection hole and matched therewith, and a nail cap formed at the end of the nail body and fixed in the sink groove, wherein the diameter of the nail cap is larger than the diameter of the injection hole and smaller than the diameter of the sink groove.

[0008] Optimally, the nail cap and the sink are fixed by welding, and the welding point is the edge where the nail cap contacts the sink.

[0009] Furthermore, a protruding structure is formed on the surface of the nail cap facing the nail body, and a receiving space is formed between the protruding structure and the nail body; and a concave hole matching with the protruding structure is formed on the sink groove.

[0010] Furthermore, the protrusion structure is an annular protrusion or protrusions arranged in a circle and arranged at equal intervals.

[0011] Optimally, the cover assembly further includes an insulating member, a pole, a sealing member and a metal member;

[0012] The cover plate includes a plate body and a first pole hole provided on the plate body, the sink groove is provided on the outer surface of the plate body, and a plurality of limiting holes are provided on the inner surface of the plate body;

[0013] The insulating member includes an insulating body, a plurality of limiting protrusions formed on one surface of the insulating body and matched with the limiting hole, a plurality of clamping protrusions formed on another surface of the insulating body, a second pole hole opened on the insulating body and corresponding to the first pole hole, and a liquid inlet protrusion formed on the insulating body and matched with the liquid injection hole, wherein the liquid inlet protrusion extends in a direction away from the plate body and has a liquid inlet channel opened therein;

[0014] The metal part comprises a metal body, a third pole hole provided on the metal body and corresponding to the first pole hole, and a plurality of limiting grooves formed on the circumference of the metal body and matched with the clamping protrusion;

[0015] The pole comprises a pole body penetrating the first pole hole, the second pole hole and the third pole hole, a first clamping piece formed on one end surface of the pole body and matched with the plate body, and a second clamping piece formed on the other end surface of the body and clamped with the metal body;

[0016] The sealing member is sleeved on the column body to ensure sealing between the column body, the plate body and the insulating body.

[0017] Furthermore, the cover plate also includes a first step portion formed on the end of the plate body, a convex ring formed on the outer surface of the plate body and located at the edge of the first pole hole, a second step portion formed in the convex ring, and a circle of anti-rotation protrusions formed on the outer end surface of the second step portion and arranged at intervals.

[0018] Furthermore, the insulating member further comprises a plurality of pressing protrusions formed on the other surface of the insulating body and a plurality of convex arc blocks formed at the edge of the other surface of the insulating body and arranged at intervals.

[0019] Furthermore, the metal part also includes a straight avoidance block formed on the metal body.

[0020] Furthermore, the pole also includes a recessed hole formed on the end surface of the second clamping piece.

[0021] Furthermore, the sealing member includes a first sealing ring body and a second sealing ring body formed on the end surface of the first sealing ring body, the first sealing ring body and the second sealing ring body have a socket hole penetrating therethrough at the center, and the second sealing ring body extends toward the direction of the metal member.

[0022] Due to the application of the above technical scheme, the utility model has the following advantages compared with the prior art: the single cover plate with high welding quality rate of the utility model adopts a sealing nail with a specific structure to cooperate with the injection hole, so that the nail cap of the sealing nail can be placed on the sink groove for fixation, which has a very low requirement on the dimensional tolerance of the injection hole, improves the assemblability of the sealing nail, improves the yield of the sealing nail welding, and reduces the waste of battery production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 This is a schematic diagram of the structure of a single cover plate with high welding rate of the utility model;

[0025] Figure 2 It is an exploded view of the cover body assembly in the single cover plate with high welding superiority rate of the utility model;

[0026] Figure 3 This is a cross-sectional view of a single cover plate with high welding quality rate of the utility model;

[0027] Figure 4 This is a partial structural cross-sectional view of a single cover plate with high welding quality rate of the utility model (Example 1);

[0028] Figure 5 This is a partial structural cross-sectional view of a single cover plate with high welding quality of the utility model (Example 2). DETAILED DESCRIPTION

[0029] 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.

[0030] 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 limiting 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.

[0031] 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

[0032] like Figures 1 to 4 The single cover plate with high welding quality mainly comprises a matching cover assembly 1 and sealing pins 2'.

[0033] The cover assembly 1 at least includes a cover plate 11, an outer surface of the cover plate 11 (the direction definition here is defined according to the positional relationship observed by the user when the single cover plate is installed on the battery housing) is provided with a recessed groove 1131', and a liquid injection hole 113' is provided at the recessed groove 1131' and passes through the cover plate 11 (that is, the diameter of the liquid injection hole 113' is smaller than the diameter of the recessed groove 1131'). The sealing nail 2' includes a nail body 22' inserted into the injection hole 113' and matched therewith, and a nail cap 21' formed at the end of the nail body 22' and fixed in the sink 1131' (the nail body 22' and the nail cap 21' are usually formed in one piece, and the sealing nail 2' can adopt the existing conventional ones; the same below). It is necessary to make the diameter of the nail cap 21' larger than the diameter of the injection hole 113' and smaller than the diameter of the sink 1131', so that the nail cap 21' of the sealing nail 2' can be placed on the sink 1131' for fixation (such as subsequent welding), so that the dimensional tolerance requirements of the injection hole 113' are very low, the assemblability of the sealing nail is improved, the yield of the sealing nail welding is improved, and the waste of battery production is reduced. Here, the shape of the sink 1131' is not limited, it can be a conventional circle, but it is more preferably an ellipse, so that it can be convenient for the laser to operate here to achieve welding of the sealing nail 2' while minimizing the area of ​​the sink 1131'. In this embodiment, as described above, the nail cap 21 ′ and the sink 1131 ′ are fixed by welding, and the welding point is the edge where the nail cap 21 ′ and the sink 1131 ′ contact.

[0034] The cover assembly 1 further includes an insulating member 12 , a pole 13 , a sealing member 14 and a metal member 15 .

[0035] The cover plate 11 includes a plate body 111 and a first pole hole 112 formed on the plate body 111, the sink 1131' is formed on the outer surface of the plate body 111, and a plurality of limiting holes 114 are also formed on the inner surface of the plate body 111. The cover plate 11 also includes a first step portion 1110 formed on the outer end of the plate body 111 (the first step portion 1110 cooperates with the battery shell to support the single cover plate on the battery shell), a convex ring 1111 formed on the outer surface of the plate body 111 and located at the edge of the first pole hole 112, a second step portion 1121 formed in the convex ring 1111, and a circle of anti-rotation protrusions 1122 formed on the outer end surface of the second step portion 1121 and arranged at intervals, which can be used to cooperate with the pole 13, so as to clamp the end of the pole 13 here and prevent the pole 13 from rotating relative to other structures.

[0036] The material of the insulating member 12 is not limited, but it is usually made of conventional plastic material; it includes an insulating body 121, a plurality of limiting protrusions 120 formed on one surface (i.e., the outer surface) of the insulating body 121 and matched with the limiting hole 114, a plurality of snap-in protrusions 126 formed on the other surface (i.e., the inner surface) of the insulating body 121, a second pole hole 122 formed on the insulating body 121 and corresponding to the first pole hole 112, and a liquid inlet protrusion 124 formed on the insulating body 121 and matched with the liquid injection hole 113', the liquid inlet protrusion 124 extends in a direction away from the plate body 111 and has a liquid inlet channel 1241 formed therein. The limiting protrusions 120 and the limiting holes 114 are usually in one-to-one correspondence, so that when the cover plate 11 and the insulating member 12 are assembled together, the limiting protrusions 120 are correspondingly inserted into the limiting holes 114, so that the cover plate 11 and the insulating member 12 will not rotate relative to each other. In addition, when the electrolyte is injected into the battery housing through the injection hole 113', the electrolyte is connected to the battery housing through the liquid inlet channel 1241 in the liquid inlet protrusion 124 to achieve the injection of the electrolyte. In this embodiment, the insulating member 12 also includes a plurality of pressing protrusions 123 formed on the other surface of the insulating body 121 and a plurality of convex arc blocks 125 formed at the edge of the other surface of the insulating body 121 and arranged at intervals. The plurality of convex arc blocks 125 can be pressed against the inner wall of the battery housing to play a guiding and positioning role, and the pressing protrusions 123 can press the battery coil to prevent it from shaking in the battery housing.

[0037] The metal part 15 is made of a conductive material, preferably copper. The metal part 15 includes a metal body 151, a third pole hole 152 opened on the metal body 151 and corresponding to the first pole hole 112, and a plurality of limiting grooves 153 formed on the circumference of the metal body 151 and matched with the clamping protrusion 126; the metal part 15 is limited by the cooperation of the clamping protrusion 126 and the limiting grooves 153, so that when the metal part 15 and the insulating part 12 are assembled together, they will not produce relative rotation. In this embodiment, the metal part 15 also includes an avoidance straight block 154 formed on the metal body 151 (that is, a piece is cut off on the metal body 151 to form a notch, and then the avoidance straight block 154 is formed at the notch) to form an avoidance space to accommodate the connecting piece of the winding core.

[0038] The pole 13 includes a pole body 133 that is inserted into the first pole hole 112, the second pole hole 122, and the third pole hole 152, a first clamping piece 131 formed on one end surface of the pole body 133 and matched with the plate body 111, and a second clamping piece 132 formed on the other end surface of the body 133 and clamped with the metal body 151. The diameters of the first clamping piece 131 and the second clamping piece 132 are both larger than the diameter of the pole body 133. In this way, the first clamping piece 131 and the second clamping piece 132 of the pole 13 can be used to firmly clamp the cover plate 11, the insulating member 12, and the metal member 15 together (such as Figure 3 As shown, at this time, the pole hole of the cover plate 11 and the metal part 15 has a clamping structure corresponding to the first clamping piece 131 and the second clamping piece 132). The pole 13 also includes a concave hole 134 opened on the end surface of the second clamping piece 132, which is usually obtained by extrusion of a riveting jig.

[0039] The seal 14 is sleeved on the column body 133 to ensure the seal between the column body 133, the plate body 111 and the insulating body 121. The seal 14 includes a first sealing ring body 141 and a second sealing ring body 142 formed on the end surface of the first sealing ring body 141. The first sealing ring body 141 and the second sealing ring body 142 have a sleeve hole 143 passing through the center thereof. The second sealing ring body 142 extends toward the direction of the metal member 15. Figure 3 As shown, the first sealing ring body 141 is usually located between the plate body 111 and the column body 133, and the second sealing ring body 142 also extends between the insulating body 121 and the column body 133 to improve the sealing and insulating effects. Example

[0040] This embodiment provides a single cover plate with high welding quality, which is basically the same as that in the first embodiment, except that the structure of the sealing nail 2 is different. Figure 5As shown, a protruding structure 23 is formed on the surface of the nail cap 21 facing the nail body 22, so that a receiving space 24 is formed between the protruding structure 23 and the nail body 22; the structure of the protruding structure 23 is not limited, and it can be an annular protrusion (with a diameter larger than the nail body 22), or a convex block arranged in a circle but at equal intervals; at this time, a concave hole 1132 matching the protruding structure 23 is opened on the sink 1131, and the concave hole 1132 is arranged around the injection hole 113. When in use, the protruding structure 23 is correspondingly inserted into the concave hole 1132, which plays a dual role of further improving the sealing effect (including the yield) and the positioning effect.

[0041] 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 single cover plate with high welding quality, characterized in that: It includes: A cover assembly, the cover assembly at least comprising a cover plate, a recessed groove is formed on the outer surface of the cover plate, and a liquid injection hole is formed at the recessed groove and penetrates the cover plate; The sealing nail comprises a nail body inserted into the injection hole and matched therewith, and a nail cap formed at the end of the nail body and fixed in the sink groove, wherein the diameter of the nail cap is larger than the diameter of the injection hole and smaller than the diameter of the sink groove.

2. The single cover plate with high welding quality according to claim 1, characterized in that: The nail cap and the sink are fixed by welding, and the welding position is the edge where the nail cap contacts the sink.

3. The single cover plate with high welding quality according to claim 1 or 2, characterized in that: A protruding structure is formed on the surface of the nail cap facing the nail body, and a receiving space is formed between the protruding structure and the nail body; a concave hole matching with the protruding structure is formed on the sink groove.

4. The single cover plate with high welding quality according to claim 3, characterized in that: The protrusion structure is an annular protrusion or protrusions arranged in a circle and arranged at equal intervals.

5. The single cover plate with high welding quality according to claim 1, characterized in that: The cover assembly also includes an insulating member, a pole, a sealing member and a metal member; The cover plate includes a plate body and a first pole hole provided on the plate body, the sink groove is provided on the outer surface of the plate body, and a plurality of limiting holes are provided on the inner surface of the plate body; The insulating member includes an insulating body, a plurality of limiting protrusions formed on one surface of the insulating body and matched with the limiting hole, a plurality of clamping protrusions formed on another surface of the insulating body, a second pole hole opened on the insulating body and corresponding to the first pole hole, and a liquid inlet protrusion formed on the insulating body and matched with the liquid injection hole, wherein the liquid inlet protrusion extends in a direction away from the plate body and has a liquid inlet channel opened therein; The metal part comprises a metal body, a third pole hole provided on the metal body and corresponding to the first pole hole, and a plurality of limiting grooves formed on the circumference of the metal body and matched with the clamping protrusion; The pole comprises a pole body penetrating the first pole hole, the second pole hole and the third pole hole, a first clamping piece formed on one end surface of the pole body and matched with the plate body, and a second clamping piece formed on the other end surface of the body and clamped with the metal body; The sealing member is sleeved on the column body to ensure sealing between the column body, the plate body and the insulating body.

6. The single cover plate with high welding quality according to claim 5, characterized in that: The cover plate also includes a first step portion formed on the outer end of the plate body, a convex ring formed on the outer surface of the plate body and located at the edge of the first pole hole, a second step portion formed in the convex ring, and a circle of anti-rotation protrusions formed on the outer end surface of the second step portion and arranged at intervals.

7. The single cover plate with high welding quality according to claim 5 or 6, characterized in that: The insulating member further comprises a plurality of pressing protrusions formed on the other surface of the insulating body and a plurality of convex arc blocks formed at the edge of the other surface of the insulating body and arranged at intervals.

8. The single cover plate with high welding quality according to claim 5 or 6, characterized in that: The metal member further includes a straight avoidance block formed on the metal body.

9. The single cover plate with high welding quality according to claim 5 or 6, characterized in that: The pole also includes a recessed hole formed on the end surface of the second clamping piece.

10. The single cover plate with high welding quality according to claim 5 or 6, characterized in that: The sealing member comprises a first sealing ring body and a second sealing ring body formed on the end surface of the first sealing ring body. The first sealing ring body and the second sealing ring body have sleeve holes penetrating therethrough at their centers, and the second sealing ring body extends toward the direction of the metal member.

Images