Battery explosion-proof valve forming mold

Abstract

The utility model discloses a battery anti-explosion valve forming die, which belongs to the technical field of battery anti-explosion valve forming equipment and comprises a female die and a male die. The die is characterized in that an annular supporting face is arranged on the upper end face of the female die, an avoiding sinking groove is formed in the inner side of the annular supporting face and provided with a supporting boss matched with the third boss, and the avoiding sinking groove is divided into a preset number of independent cavities through the supporting boss; ventilation flow channels are formed in the upper end faces of the portions, located in the mutually-independent cavities with the preset number, of the female dies and communicate with the mutually-independent cavities with the preset number. The die has the advantages that only the supporting boss at the position of the reinforcing rib nick groove of the female die serves as a working face, the other four areas serve as the receding sinking grooves, the ventilation flow channels are additionally arranged, the nick position of an anti-explosion valve is formed in place in the extrusion forming process, and then the anti-explosion valve is formed in place. And under the action of air pressure, the explosion-proof valve is bulged outwards to be in contact with the working surface of a male die part for forming, so that the machining precision of the curved surface of the male-female die is greatly improved.

Description

Technical Field:

[0001] The utility model belongs to the technical field of battery explosion-proof valve forming equipment, and more specifically relates to a battery explosion-proof valve forming die. Background Art:

[0002] Currently, the new energy vehicle batteries are generally lithium batteries. A lithium battery needs to be equipped with a battery top cover with explosion-proof function, and the key component in the battery top cover is the explosion-proof valve structure.

[0003] The so-called explosion-proof valve structure mainly consists of a concave sink, and there is also an indentation at the bottom of the sink. When a safety accident occurs in a lithium battery, it will break through the explosion-proof valve structure first before its explosion, avoiding serious accidents caused by excessive internal and external pressure differences.

[0004] For example, the national utility model patent with the patent number 202410167182.5 discloses an explosion-proof valve and a battery, and discloses an explosion-proof valve. An annular valve wire groove, an annular indentation groove and a reinforcing rib indentation groove are processed on the arc surface of the explosion-proof valve.

[0005] However, the explosion-proof valve structure is recessed downward relative to the upper surface of the battery top cover. The material at the recessed part will fill the remaining positions of the battery top cover after flowing and deforming. That is to say, the surface of the explosion-proof valve is a profiled curved surface, and it is necessary to process the profiled curved surface on the surface of the explosion-proof valve. During forming, both the concave die and the convex die need to be extruded with the surface of the explosion-proof valve. The stress concentration at the indentation position of the explosion-proof valve is very serious, and the machining accuracy of the curved surfaces of the convex and concave dies is relatively high, making it difficult to debug the explosion pressure of the explosion-proof valve for the die. Summary of the Utility Model:

[0006] To solve the above problems and overcome the deficiencies of the prior art, the utility model provides a battery explosion-proof valve forming die;

[0007] The first technical problem to be solved is: when processing the profiled curved surface on the surface of the explosion-proof valve, both the concave die and the convex die need to be extruded with the surface of the explosion-proof valve during forming, the stress concentration at the indentation position of the explosion-proof valve is very serious, and the machining accuracy of the curved surfaces of the convex and concave dies is relatively high.

[0008] The specific technical solution of the utility model to solve the above technical problems is as follows: the battery explosion-proof valve forming die includes a concave die and a convex die; the convex die is provided with a first annular boss and a second annular boss for extruding the upper end surface of the battery explosion-proof valve to form an annular valve wire groove and an annular indentation groove, and a third boss for extruding the upper end surface of the battery explosion-proof valve to form a reinforcing rib indentation groove is arranged inside the second annular boss; the upper end surfaces of the first annular boss, the second annular boss and the third boss are all on a curved surface, and the curved surface is matched with the profiled curved surface of the explosion-proof valve surface; its characteristics are:

[0009] An annular support surface is provided on the upper end surface of the female die. A relief sinking groove is provided inside the annular support surface. A support boss that cooperates with the third boss is provided in the relief sinking groove. The support boss divides the relief sinking groove into a preset number of independent cavities. Air flow channels are provided on the upper end surfaces of the female die located in the preset number of independent cavities, and the air flow channels communicate with the preset number of independent cavities.

[0010] Further, the third boss is composed of two semi-circular arcs.

[0011] Further, the tops of the two semi-circular arcs are in contact with each other.

[0012] Further, both ends of the semi-circular arc are connected to the second annular boss.

[0013] Further, the air flow channel is connected to an air source through a joint and a solenoid valve.

[0014] Further, the annular support surface and the support boss are matched with a curved surface that is profiled to the surface of the explosion-proof valve.

[0015] The beneficial effects of the present utility model are as follows:

[0016] One advantage of the present utility model is that the female die of the battery explosion-proof valve forming die only sets the support boss at the position of the reinforcing rib notch groove as the working surface, and the other four areas are made into relief sinking grooves, and an air flow channel is added. When extrusion molding, the notch position of the explosion-proof valve is formed in place first, so that the stress can be well released when notching during molding. After the notch of the explosion-proof valve is formed in place, high-pressure gas is introduced into the relief sinking groove, and under the action of air pressure, the explosion-proof valve will be expanded outward to contact the working surface of the punch part to form, which well solves the problem of deformation caused by stress concentration at the notch position of the explosion-proof valve and greatly improves the machining accuracy of the curved surfaces of the male and female dies. Description of the drawings:

[0017] Attached Figure 1 is a schematic diagram of the explosion structure of the present utility model;

[0018] Attached Figure 2 is a schematic diagram of the bottom view structure of the present utility model;

[0019] Attached Figure 3 is a schematic diagram of the punch structure of the present utility model;

[0020] Attached Figure 4 is a schematic diagram of the female die structure of the present utility model;

[0021] Attached Figure 5 is a schematic diagram of the structure of the prior art battery explosion-proof valve;

[0022] Attached Figure 6 is a schematic diagram of another view of the structure of the prior art battery explosion-proof valve; In the drawings:

[0023] 1. Punch; 2. Battery explosion-proof valve; 3. Die; 11. Third boss; 12. First annular boss; 13. Second annular boss; 21. Support boss; 22. Annular support surface; 23. Relief sinking groove; 24. Air flow channel; 31. Annular valve wire groove; 32. Annular indentation groove; 33. Reinforcing rib indentation groove. Specific implementation manner:

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "rear", "lower left", "upper right", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 protection scope of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] Specific implementation manner of the present invention: The forming die for the battery explosion-proof valve includes a die 3 and a punch 1; the punch 1 is provided with a first annular boss 12 and a second annular boss 13 for extruding the upper end surface of the battery explosion-proof valve 2 to form an annular valve wire groove 31 and an annular indentation groove 32, and a third boss 11 for extruding the upper end surface of the battery explosion-proof valve 2 to form a reinforcing rib indentation groove 33 is arranged inside the second annular boss 13; the upper end surfaces of the first annular boss 12, the second annular boss 13, and the third boss 11 are all on a curved surface, and the curved surface is matched with the curved surface that imitates the surface of the explosion-proof valve; it is characterized in that:

[0026] The upper end surface of the die 3 is provided with an annular support surface 22, a relief sinking groove 23 is arranged inside the annular support surface 22, the relief sinking groove 23 is provided with a support boss 21 that cooperates with the third boss 11, the support boss 21 divides the relief sinking groove 23 into a preset number of independent cavities, and air flow channels 24 are opened on the upper end surface of the die 3 in the preset number of independent cavities, and the air flow channels 24 communicate with the preset number of independent cavities.

[0027] Further, the third boss 11 is composed of two semi-circular arcs.

[0028] Further, the tops of the two semi-circular arcs are in contact with each other.

[0029] Further, the two ends of the semi-circular arc are connected to the second annular boss 13.

[0030] Further, the air flow channel 24 is connected to a gas source through a joint and a solenoid valve.

[0031] Further, the annular support surface 22 and the support boss 21 are matched with the curved surface that is profiled to the surface of the explosion-proof valve.

[0032] It should be noted that the present utility model is a forming mold for a battery explosion-proof valve. During specific operation,

[0033] 1. The working surface of the punch 1 includes:

[0034] The first annular boss 12 and the second annular boss 13 for extruding the upper end surface of the battery explosion-proof valve 2 to form an annular valve wire groove 31 and an annular indentation groove 32, and the third boss 11 for extruding the upper end surface of the battery explosion-proof valve 2 to form a reinforcing rib notch groove 33;

[0035] Due to the curved surface that is profiled to the surface of the explosion-proof valve, therefore, the upper end surfaces of the first annular boss 12, the second annular boss 13, and the third boss 11 are all on the curved surface, and the curved surface is matched with the curved surface that is profiled to the surface of the explosion-proof valve;

[0036] 2. The working surface of the die 3: The annular support surface 22 for supporting the explosion-proof valve. The support boss 21 that only retains the position of the reinforcing rib notch groove inside the annular support surface 22 is the working surface, and avoidance sinking grooves 23 are made in the other four areas, and an air flow channel 24 is added.

[0037] 3. When extrusion molding, the notch position of the explosion-proof valve is formed in place first, so that the stress can be well released when forming the notch. After the notch of the explosion-proof valve is formed in place, the avoidance sinking grooves 23 are simultaneously filled with high-pressure gas into the four independent cavities of the avoidance sinking grooves 23 through solenoid valves. Under the action of air pressure, the explosion-proof valve will be expanded outward to contact and form with the profiled curved surface of the punch 1, which well solves the problem of deformation caused by stress concentration at the notch position of the explosion-proof valve and greatly improves the machining accuracy of the curved surfaces of the punch and die.

[0038] As a supplement, the power principle and structure of the mold closing and mold opening of the punch 1 and the die 3 of the forming mold for the battery explosion-proof valve belong to the prior art, and the present utility model does not cover this scope and will not be elaborated here.

[0039] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A forming die for a battery explosion-proof valve, comprising a female die (3) and a male die (1); the male die (1) is provided with a first annular boss (12) and a second annular boss (13) for extruding the upper end surface of the battery explosion-proof valve (2) to form an annular valve wire groove (31) and an annular indentation groove (32), and a third boss (11) for extruding the upper end surface of the battery explosion-proof valve (2) to form a reinforcing rib notch groove (33) is arranged inside the second annular boss (13); the upper end surfaces of the first annular boss (12), the second annular boss (13) and the third boss (11) are all on a curved surface, and the curved surface is matched with the curved surface of the explosion-proof valve surface; characterized in that: The upper end surface of the female die (3) is provided with an annular support surface (22), an avoidance sinking groove (23) is arranged inside the annular support surface (22), a support boss (21) matched with the third boss (11) is arranged in the avoidance sinking groove (23), the support boss (21) divides the avoidance sinking groove (23) into a preset number of independent cavities, air flow channels (24) are arranged on the upper end surface of the female die (3) in the preset number of independent cavities, and the air flow channels (24) communicate with the preset number of independent cavities.

2. The battery explosion-proof valve forming die according to claim 1, characterized in that The third boss (11) is composed of two semi-circular arcs.

3. The battery explosion-proof valve forming die according to claim 2, characterized in that The tops of the two semi-circular arcs are in contact with each other.

4. The battery explosion-proof valve forming die according to claim 3, wherein Both ends of the semi-circular arc are connected to the second annular boss (13).

5. The battery explosion-proof valve forming die according to claim 1, characterized in that The air flow channel (24) is connected to an air source through a joint and a solenoid valve.

6. The battery explosion-proof valve forming die according to claim 1, wherein The annular support surface (22) and the support boss (21) are matched with the curved surface of the explosion-proof valve surface.

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