Injection molding explosion-proof valve, top cover structure, battery and electric device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to an injection molding explosion-proof valve which comprises a first plastic structure, a second plastic structure and a fusion part, and the burst pressure borne by the fusion part is smaller than that borne by the first plastic structure and the second plastic structure; the fusion part comprises a first fusion part, and the first plastic structure and the second plastic structure are connected with each other through the first fusion part. According to the injection molding explosion-proof valve, the fusion part is arranged as an explosion-proof area, the explosion-proof area can be determined on the premise that the overall thickness of the injection molding explosion-proof valve is not reduced, the function of the explosion-proof valve is guaranteed, and meanwhile electrolyte leakage can be avoided. In addition, the utility model further discloses a top cover structure comprising the injection molding explosion-proof valve, a battery and electric equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to an injection-molded explosion-proof valve, a top cover structure, a battery and an electrical device. Background Art

[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides broad space for the application and development of batteries.

[0003] Among them, in order to improve the safety of the battery, most batteries are equipped with explosion-proof valves, which can release high-pressure gas to the outside when the pressure inside the battery suddenly increases or the temperature rises rapidly. In the existing injection molding explosion-proof, most injection molding explosion-proof valves use a local thinning method to determine the explosion-proof area. Although the explosion-proof area can be confirmed, it is easy for the electrolyte to directly leak through the thinned area of ​​the explosion-proof valve. For this reason, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content

[0004] One of the purposes of the utility model is to provide an injection-molded explosion-proof valve in response to the deficiencies in the prior art. By setting a fusion portion as an explosion-proof area, the explosion-proof area can be determined without reducing the overall thickness of the injection-molded explosion-proof valve, thereby ensuring the function of the explosion-proof valve and avoiding electrolyte leakage.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An injection-molded explosion-proof valve comprises a first plastic structure, a second plastic structure and a fusion portion, wherein the fusion portion can withstand a bursting pressure that is smaller than the bursting pressure that the first plastic structure and the second plastic structure can withstand; the fusion portion comprises a first fusion portion, and the first plastic structure and the second plastic structure are connected to each other via the first fusion portion.

[0007] As an improvement to the injection-molded explosion-proof valve described in the utility model, the first plastic structure and the second plastic structure are configured to be polyphenylene sulfide containing glass fiber material, the fusion portion is a fusion line structure formed by the fusion of polyphenylene sulfide, and the strength of the fusion portion is less than that of the first plastic structure and the second plastic structure, thereby being able to serve as an explosion-proof area, thereby ensuring that the injection-molded explosion-proof valve plays a protective role without reducing the thickness.

[0008] As an improvement of the injection-molded explosion-proof valve of the utility model, the volume ratio of the first plastic structure to the volume of the injection-molded explosion-proof valve is 1:4-3:4.

[0009] As an improvement of the injection-molded explosion-proof valve described in the utility model, the first plastic structure is provided with at least one first injection port, and the second plastic structure is provided with at least one second injection port. The first injection port and the second injection port are used for simultaneous injection molding of the first plastic structure and the second plastic structure to ensure the formation of the fusion portion.

[0010] As an improvement of the injection-molded explosion-proof valve described in the utility model, the second plastic structure is arranged around the first plastic structure.

[0011] As an improvement of the injection-molded explosion-proof valve described in the utility model, the first plastic structure includes a plurality of interconnected plastic blocks, each of which is provided with a first injection port; and / or the second plastic structure includes a plurality of interconnected plastic blocks, the plurality of plastic blocks are arranged around the first plastic structure, and each of which is provided with a second injection port.

[0012] As an improvement of the injection molding explosion-proof valve described in the utility model, the fusion portion also includes a second fusion portion, and the second fusion portion is formed between two adjacent plastic blocks. The second fusion portion can also serve as an explosion-proof area, further ensuring the realization of the protection function of the injection molding explosion-proof valve.

[0013] In other technical solutions, the first plastic structure and the second plastic structure are arranged in parallel, and the first fusion portion is arranged between the first plastic structure and the second plastic structure.

[0014] As an improvement of the above solution, the first plastic structure includes a plurality of interconnected plastic blocks, the second fusion portion is formed between two adjacent plastic blocks, and each of the plastic blocks is provided with a first injection port; and / or the second plastic structure includes a plurality of interconnected plastic blocks, and each of the plastic blocks is provided with a second injection port.

[0015] The second purpose of the utility model is to provide a top cover structure, comprising the injection-molded explosion-proof valve and a cover body as described above, wherein the injection-molded explosion-proof valve is arranged on the cover body.

[0016] As an improvement of the top cover structure described in the utility model, a groove is provided at the edge of the injection-molded explosion-proof valve, a protrusion is provided at the connection between the cover body and the injection-molded explosion-proof valve, and the groove and the protrusion match each other; or, a protrusion is provided at the edge of the injection-molded explosion-proof valve, a groove is provided at the connection between the cover body and the injection-molded explosion-proof valve, and the protrusion and the groove match each other, and the protrusion and the groove make the connection between the injection-molded explosion-proof valve and the cover body more secure, thereby increasing the stability of the top cover structure.

[0017] The third object of the present utility model is to provide a battery, comprising the top cover structure as described above.

[0018] A fourth object of the present invention is to provide an electrical device comprising the battery as described above.

[0019] The beneficial effect of the utility model is that the injection-molded explosion-proof valve of the utility model comprises a first plastic structure, a second plastic structure and a fusion part, the explosion pressure that the fusion part can withstand is less than the explosion pressure that the first plastic structure and the second plastic structure can withstand; the fusion part comprises a first fusion part, and the first plastic structure and the second plastic structure are connected to each other through the first fusion part. The existing injection-molded explosion-proof valve determines the explosion-proof area by reducing the thickness, while the utility model sets the fusion part as the explosion-proof area, which can complete the determination of the explosion-proof area without reducing the overall thickness of the injection-molded explosion-proof valve, ensuring the realization of the explosion-proof valve function while also avoiding the occurrence of electrolyte leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Figure 1 This is one of the structural schematic diagrams of implementation mode 1 of the present utility model.

[0022] Figure 2 This is the second structural diagram of the first implementation mode of the present utility model.

[0023] Figure 3 This is the third structural diagram of implementation mode 1 of the present utility model.

[0024] Figure 4 This is one of the structural schematic diagrams of the second implementation mode of the present utility model.

[0025] Figure 5 This is the second structural diagram of the second implementation mode of the present utility model.

[0026] Figure 6 It is a structural schematic diagram of the top cover structure in the utility model.

[0027] Figure 7 It is a cross-sectional view of the top cover structure in the utility model.

[0028] The reference numerals are described as follows:

[0029] 1. First plastic structure; 11. Plastic block; 2. Second plastic structure; 3. Fusion part; 31. First fusion part; 32. Second fusion part; 4. First injection port; 5. Second injection port;

[0030] 100. Injection-molded explosion-proof valve; 200. Cover body; 300. Top cover structure. DETAILED DESCRIPTION

[0031] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0034] The following is combined with Figures 1 to 7 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.

[0035] Implementation Method 1

[0036] like Figure 1 As shown, an injection-molded explosion-proof valve comprises a first plastic structure 1, a second plastic structure 2 and a first fusion portion 31. The first plastic structure 1 and the second plastic structure 2 are connected to each other via the first fusion portion 31. The second plastic structure 2 is arranged around the first plastic structure 1. The volume ratio of the first plastic structure 1 to the volume of the injection-molded explosion-proof valve is 1:4-3:4. The first plastic structure 1 is provided with at least one first injection port 4, and the second plastic structure 2 is provided with at least one second injection port 5.

[0037] It should be noted that during the injection molding process, when two or more strands of material converge, a fusion line is formed because they fail to completely fuse together. This is because during the cooling process, air is trapped between the two strands of material. The trapped air will hinder the entanglement effect of polymer molecules, causing the molecular chains to separate from each other. This will cause the mechanical strength of the fusion line area to be lower than that of the non-fusion line area.

[0038] The injection-molded explosion-proof valve of the present application has at least two injection ports. Compared with the explosion-proof valve with only one injection port in the prior art, during the molding process of the injection-molded explosion-proof valve, at least two strands of material merge to form a fusion line. Since the mechanical strength of the fusion line area is lower than that of the non-fusion line area, when a battery using the injection-molded explosion-proof valve experiences thermal runaway, the fusion line, i.e., the fusion portion 3, serves as an explosion area to relieve pressure. Compared with the existing method of determining the explosion-proof area by local thinning, the injection-molded explosion-proof valve greatly reduces the risk of electrolyte leakage from the explosion-proof valve to the outside world, and plays a protective role without reducing the thickness.

[0039] Specifically in this implementation mode, please combine Figure 1 During the injection molding of the injection-molded explosion-proof valve, the injection molding device injects the first material through the first injection port 4, and the injection molding device injects the second material through the second injection port 5, and the first material and the second material finally merge. After cooling and molding, the first material forms the first plastic structure 1, and the second material forms the second plastic structure 2. The fusion line is formed at the junction of the first material and the second material, that is, the first fusion portion 31.

[0040] It is understandable that the material of the first plastic structure 1 and the material of the second plastic structure 2 are both heat-sensitive materials, and the heat-sensitive material can be PPS material, PSU material, PC material, PFA material, PBT material, PA material, nano material or PP material, etc. In addition, the materials of the first plastic structure 1 and the second plastic structure 2 can be the same or different. Exemplarily, in this embodiment, the material of the first plastic structure 1 and the material of the second plastic structure 2 are both PPS materials containing glass fiber. The strength of the fusion line formed by the plastic material containing glass fiber will be greatly reduced, which is conducive to improving the detonation sensitivity of the injection molded explosion-proof valve.

[0041] In this embodiment, the injection-molded explosion-proof valve is set to be circular. The circular injection-molded explosion-proof valve makes the first plastic structure 1 and the second plastic structure 2 both annular structures, thereby making the first fusion part 31 a circular fusion line structure. The circular fusion line structure can be subjected to uniform pressure when the internal air pressure is too high, so that the first fusion part 31 can achieve the fastest pressure relief rate when it explodes, which is beneficial to improving safety performance.

[0042] There are other situations in the present technical solution. The shape of the injection-molded explosion-proof valve can be changed according to the needs of the specific battery, such as the common square or rectangle. It is worth mentioning that it is necessary to maintain the volume ratio of the first plastic structure 1 to the volume ratio of the injection-molded explosion-proof valve, which can ensure that the proportion of the first fusion portion 31 in the injection-molded explosion-proof valve is reasonable, thereby ensuring the smooth realization of the pressure relief and explosion-proof function of the injection-molded explosion-proof valve.

[0043] like Figure 2 As shown, this embodiment includes other technical solutions, the first plastic structure 1 includes a plurality of interconnected plastic blocks 11, and each plastic block 11 is provided with a first injection port 4. During injection molding, the plurality of plastic blocks 11 and the second plastic structure 2 are simultaneously injected through the first injection port 4 and the second injection port 5, respectively, and a second fusion portion 32 is formed between the plurality of plastic blocks 11, and a first fusion portion 31 is formed between the plastic block 11 and the second plastic structure 2.

[0044] In the present technical solution, the first fusion part 31 and the second fusion part 32 are fusion line structures, and can withstand a bursting pressure that is smaller than the plastic block 11 and the second plastic structure 2. Therefore, the first fusion part 31 and the second fusion part 32 can both be used as explosion-proof areas. Compared with the structure with only the first fusion part 31, the proportion of the explosion-proof area in the injection molding explosion-proof valve is increased. In actual application in the battery structure, when the pressure inside the battery exceeds the set range, the first fusion part 31 and the second fusion part 32 explode first, thereby increasing the flow rate of the high-temperature and high-pressure gas and further improving the safety performance of the battery.

[0045] In the present technical solution, there are four plastic blocks 11, and the central angles of the plastic blocks 11 are the same, so that the volumes of the four plastic blocks 11 are the same, and the second fusion parts 32 are evenly distributed and can explode simultaneously, thereby increasing the pressure relief rate.

[0046] It is understandable that there are other situations in the present technical solution, and the number of the plastic blocks 11 may also be 2, 3, or 5, etc.; the areas of the multiple plastic blocks 11 may be equal or unequal.

[0047] like Figure 3 As shown, this embodiment includes other technical solutions, the second plastic structure 2 includes a plurality of interconnected plastic blocks 11, the plurality of plastic blocks 11 are arranged around the first plastic structure 1, and each plastic block 11 is provided with a second injection port 5. During injection molding, the plurality of plastic blocks 11 and the first plastic structure 1 are simultaneously injected through the second injection port 5 and the first injection port 4, respectively, and a second fusion portion 32 is formed between the plurality of plastic blocks 11, and a first fusion portion 31 is formed between the plastic block 11 and the first plastic structure 1.

[0048] In the present technical solution, three plastic blocks 11 are provided, and the areas of the plastic blocks 11 are equal. In other technical solutions of the present embodiment, the number of plastic blocks 11 can be set to two, four or six, etc., according to actual conditions, and no specific regulations are given.

[0049] Since the second plastic structure 2 is arranged around the first plastic structure 1, the circumference of the second plastic structure 2 is longer than that of the first plastic structure 1. During injection molding, the second plastic structure 2 has a structure with multiple plastic blocks 11, compared with the structure of the first plastic structure 1 having multiple plastic blocks 11. When the number of plastic blocks 11 is the same, the distance between the second injection ports 5 is greater than the distance between the first injection ports 4, and the injection molding devices are less likely to collide, thereby reducing the difficulty of assembly.

[0050] In other embodiments, the first plastic structure 1 and the second plastic structure 2 are both composed of a plurality of plastic blocks 11, and each plastic block 11 is correspondingly provided with a first injection port 4 or a second injection port 5 to ensure simultaneous injection of the plurality of plastic blocks 11, thereby ensuring the formation of a plurality of first fusion portions 31 and second fusion portions 32. This embodiment can further increase the volume of the explosion-proof area, which is conducive to the realization of the explosion-proof pressure relief function of the injection molding explosion-proof valve.

[0051] Implementation Method 2

[0052] like Figure 4 As shown, in this embodiment, the first plastic structure 1 and the second plastic structure 2 are arranged in parallel. Compared with the surrounding structure, the parallel structure is more conducive to the formation of the first fusion portion 3 and also reduces the difficulty of injection molding.

[0053] In this embodiment, the injection-molded explosion-proof valve is a circular structure, the first fusion portion 3 is the central axis position of the injection-molded explosion-proof valve, and the first plastic structure 1 and the second plastic structure 2 have the same volume, which can ensure that when the internal air pressure of the battery is too high, the first fusion portion 3 can form a maximum gas flow space and increase the flow rate of high-temperature and high-pressure gas.

[0054] It can be understood that in this embodiment, the shape of the injection-molded explosion-proof valve can be changed according to actual needs, and the areas of the first plastic structure 1 and the second plastic structure can also be different. The beneficial effect of the first fusion portion 3 being able to serve as an explosion-proof area can also be achieved without limitation.

[0055] like Figure 5As shown, in other technical solutions of this embodiment, the first plastic structure 1 includes a plurality of interconnected plastic blocks 11, each plastic block 11 is provided with a first injection port 4, the second plastic structure 2 includes a plurality of interconnected plastic blocks 11, each plastic block 11 is provided with a second injection port 5, the first plastic structure 1 includes a plurality of interconnected plastic blocks 11, the second plastic structure 2 includes a plurality of interconnected plastic blocks 11, and a second fusion portion 32 is formed between two adjacent plastic blocks 11, the second fusion portion 32 increases the explosion-proof area, further ensures the realization of the protection function of the injection molding explosion-proof valve, and increases safety.

[0056] It can be understood that in the present technical solution, the first plastic structure 1 can be arranged to include a plurality of interconnected plastic blocks 11, or the second plastic structure 2 can be arranged to include a plurality of interconnected plastic blocks 11. While ensuring the implementation of the explosion-proof valve function, the number of plastic blocks 11 can be reduced, thereby reducing the difficulty of assembly.

[0057] It should be noted that the injection-molded explosion-proof valve may include not only the first plastic structure 1 and the second plastic structure 2, but may also include multiple plastic structures. However, it should be noted that when setting the number of plastic structures and plastic blocks 11, since the strength of the formed fusion line structure is lower than that of the plastic block 11 and the plastic structure, in actual applications, it is necessary to consider whether the overall physical strength of the injection-molded explosion-proof valve meets the requirements.

[0058] Top cover structure

[0059] like Figure 6 As shown, the top cover structure includes the above-mentioned injection-molded explosion-proof valve 100 and a cover body 200 , and the injection-molded explosion-proof valve 100 is arranged on the cover body 200 .

[0060] like Figure 7 As shown, the edge of the injection-molded explosion-proof valve 100 is provided with a groove, and the connection between the cover body 200 and the injection-molded explosion-proof valve 100 is provided with a protrusion, and the groove and the protrusion match each other. The structure of the groove and the protrusion increases the connection strength between the cover body 200 and the injection-molded explosion-proof valve 100, thereby increasing the stability of the top cover structure. In some embodiments, the edge of the injection-molded explosion-proof valve 100 is provided with a protrusion, and the connection between the cover body 200 and the injection-molded explosion-proof valve 100 is provided with a groove, and the protrusion and the groove match each other.

[0061] It is understandable that in order to increase the connection strength between the injection-molded explosion-proof valve 100 and the cover body 200, other structures may also be selected without making any specific settings.

[0062] Battery

[0063] A battery includes the above-mentioned top cover structure 300, and the battery can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc.

[0064] Electrical devices

[0065] An electrical device, including the above-mentioned battery, can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0066] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. An injection-molded explosion-proof valve, characterized in that: It comprises a first plastic structure (1), a second plastic structure (2) and a fusion portion (3), wherein the fusion portion (3) can withstand a bursting pressure that is smaller than the bursting pressure that the first plastic structure (1) and the second plastic structure (2) can withstand; The fusion portion (3) comprises a first fusion portion (31), and the first plastic structure (1) and the second plastic structure (2) are connected to each other via the first fusion portion (31).

2. The injection-molded explosion-proof valve according to claim 1, characterized in that: The first plastic structure (1) is provided with at least one first injection port (4), and the second plastic structure (2) is provided with at least one second injection port (5).

3. The injection-molded explosion-proof valve according to claim 2, characterized in that: The second plastic structure (2) is arranged around the first plastic structure (1).

4. The injection-molded explosion-proof valve according to claim 3, characterized in that: The first plastic structure (1) comprises a plurality of interconnected plastic blocks (11), each of the plastic blocks (11) being provided with a first injection port (4); And / or, the second plastic structure (2) comprises a plurality of interconnected plastic blocks (11), the plurality of plastic blocks (11) are arranged around the first plastic structure (1), and each of the plastic blocks (11) is provided with a second injection port (5).

5. The injection-molded explosion-proof valve according to claim 2, characterized in that: The first plastic structure (1) and the second plastic structure (2) are arranged in parallel, and the first fusion portion (31) is arranged between the first plastic structure (1) and the second plastic structure (2).

6. The injection-molded explosion-proof valve according to claim 5, characterized in that: The first plastic structure (1) comprises a plurality of interconnected plastic blocks (11), each of the plastic blocks (11) being provided with a first injection port (4); And / or, the second plastic structure (2) comprises a plurality of interconnected plastic blocks (11), and each of the plastic blocks (11) is provided with a second injection port (5).

7. The injection-molded explosion-proof valve according to claim 4 or 6, characterized in that: The fusion portion (3) further comprises a second fusion portion (32), and the second fusion portion (32) is formed between two adjacent plastic blocks (11).

8. The injection molded explosion-proof valve according to claim 1, characterized in that: The ratio of the volume of the first plastic structure (1) to the volume of the injection-molded explosion-proof valve is 1:4-3:

4.

9. A top cover structure, characterized in that: It comprises an injection-molded explosion-proof valve (100) and a cover body (200) according to any one of claims 1 to 8, wherein the injection-molded explosion-proof valve (100) is arranged on the cover body (200).

10. The top cover structure according to claim 9, characterized in that: The edge of the injection-molded explosion-proof valve (100) is provided with a groove, and the connection between the cover body (200) and the injection-molded explosion-proof valve (100) is provided with a protrusion, and the groove and the protrusion match each other; Alternatively, a protrusion is provided on the edge of the injection-molded explosion-proof valve (100), and a groove is provided at the connection between the cover body (200) and the injection-molded explosion-proof valve (100), and the protrusion and the groove match each other.

11. A battery, characterized in that: It comprises the top cover structure (300) as claimed in any one of claims 9 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11.

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