Battery top cover and single battery

Abstract

The utility model discloses a battery top cover and a single battery, and relates to the technical field of new energy batteries. The battery top cover comprises an insulating top cover, an anti-explosion valve and a pole; the pole is connected to the insulating top cover; a liquid injection hole is formed in the insulating top cover, and the anti-explosion valve penetrates through the liquid injection hole and is detachably connected with the inner wall of the liquid injection hole. According to the battery top cover provided by the invention, the manufacturing process of the battery top cover can be simplified, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of new energy batteries, and in particular to a battery top cover and a single battery. Background Art

[0002] Currently, new energy batteries are experiencing rapid development. While ensuring battery safety, they are also required to have high energy density and low cost. The cost of batteries is primarily concentrated in the top cover.

[0003] However, the existing battery cover process is complicated and the production cost is high. Utility Model Content

[0004] The present application provides a battery top cover and a single battery to simplify the manufacturing process of the battery top cover and reduce production costs.

[0005] The present application provides a battery top cover, including an insulating top cover, an explosion-proof valve and a pole;

[0006] The pole is connected to the insulating top cover;

[0007] A liquid injection hole is provided on the insulating top cover, and the explosion-proof valve is passed through the liquid injection hole and is detachably connected to the inner wall of the liquid injection hole.

[0008] In some possible implementations, the explosion-proof valve is threadedly connected to the inner wall of the liquid injection hole.

[0009] In some possible implementations, the explosion-proof valve includes an explosion-proof valve body and a filter membrane group with air permeability;

[0010] The explosion-proof valve body is provided with an exhaust passage and an exhaust hole which are connected to each other. The exhaust hole is located at one axial end of the explosion-proof valve body and is connected to the external environment.

[0011] The filter membrane group is arranged in the exhaust channel.

[0012] In some possible embodiments, the filtration membrane group includes at least one of a drying membrane, an oil-isolating membrane, and a water-isolating membrane;

[0013] When the filter membrane group includes the drying membrane, the oil-isolating membrane and the water-isolating membrane at the same time, the drying membrane, the oil-isolating membrane and the water-isolating membrane are sequentially spaced apart along the axial direction of the explosion-proof valve body, and the drying membrane is arranged close to the exhaust hole.

[0014] In some possible implementations, an assembly hole is opened in the insulating top cover, and the pole is disposed in the assembly hole and is injection-moldedly connected to the insulating top cover.

[0015] In some possible implementations, the insulating top cover includes a first side, and an annular limiting edge is protruding from an inner wall of the assembly hole, and the limiting edge is located at an end of the assembly hole close to the first side;

[0016] The pole is provided with an annular assembly groove facing the first side;

[0017] The battery top cover further includes a sealing ring, which is embedded in the assembly groove and abuts against a side of the limiting edge away from the first side.

[0018] In some possible implementations, the insulating top cover further includes a second side, and the pole further includes an internal thread groove facing the second side.

[0019] In some possible embodiments, the inner wall of the assembly hole and the side of the pole facing the inner wall of the assembly hole, one of which is protruding with at least one rib, and the other is provided with at least one limiting groove, the rib is parallel to the axial direction of the assembly hole, and the at least one rib is inserted into the at least one limiting groove in a one-to-one correspondence.

[0020] In some possible implementations, four ribs are protruding from the inner wall of the assembly hole, and the four ribs are evenly spaced along the circumference of the assembly hole.

[0021] Four limiting grooves are provided on one side of the pole facing the inner wall of the assembly hole, and the four ribs are inserted into the four limiting grooves in a one-to-one correspondence.

[0022] In addition, the present application also provides a single battery, including the battery top cover provided in the above embodiments.

[0023] The beneficial effects of this application are as follows: The battery cover provided herein has an explosion-proof valve located at the injection hole and detachably connected to the inner wall of the injection hole, allowing the injection hole and explosion-proof valve to be integrated into the same location on the insulating cover. This facilitates assembly and disassembly of the explosion-proof valve, simplifies the assembly process, and reduces assembly costs. This eliminates the need for a separate explosion-proof valve on the insulating cover, further reducing the cost of manufacturing the battery cover. Furthermore, it improves the space utilization of the battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 shows a schematic diagram of the three-dimensional structure of the battery top cover in some embodiments;

[0026] Figure 2 A schematic cross-sectional structure diagram of a battery top cover in some embodiments is shown;

[0027] Figure 3 Another schematic cross-sectional view of the battery top cover in some embodiments is shown;

[0028] Figure 4 Shows a schematic structural diagram of an insulating top cover in some embodiments;

[0029] Figure 5 Schematic diagrams of cross-sectional structures of explosion-proof valves in some embodiments are shown;

[0030] Figure 6 shows a schematic diagram of the three-dimensional structure of the pole in some embodiments;

[0031] Figure 7 Schematic diagrams showing the assembly relationship between the pole and the sealing ring in some embodiments are shown.

[0032] Description of main component symbols:

[0033] 1000-battery top cover;

[0034] 100 - Insulation cover; 101 - First side; 102 - Second side; 110 - Injection hole; 111 - Internal thread; 120 - Assembly hole; 121 - Limiting edge; 122 - Rib; 130 - Identification portion;

[0035] 200-explosion-proof valve; 210-explosion-proof valve body; 211-external thread; 212-exhaust channel; 213-exhaust hole; 214-installation slot; 220-filter membrane group; 221-drying membrane; 222-oil barrier membrane; 223-water barrier membrane;

[0036] 300-pole; 310-assembly slot; 320-limiting slot; 330-internal thread groove;

[0037] 400-Sealing ring. DETAILED DESCRIPTION

[0038] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0041] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0042] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] like Figures 1 to 4 As shown, an embodiment provides a battery top cover 1000 , including an insulating top cover 100 , an explosion-proof valve 200 and two poles 300 .

[0044] In some embodiments, the insulating cover 100 can be made of a plastic material such as polyphenylene sulfide (PPS), polypropylene (PP), acrylonitrile butadiene styrene (ABS), or polyethylene glycol terephthalate (PET), providing insulation properties. This allows the insulating cover 100 to be lightweight, thereby reducing the overall weight of the battery cover 1000 and facilitating a lightweight design for the battery cover 1000.

[0045] In other embodiments, the insulating top cover 100 may also be made of insulating silicone or insulating rubber.

[0046] In this embodiment, both poles 300 are connected to the insulating cap 100, and the two poles 300 are spaced apart. It is understood that one pole 300 can be used as a positive pole, and the other pole 300 can be used as a negative pole. The insulating cap 100 provides insulation protection between the two poles 300, preventing a short circuit between the two poles 300.

[0047] In addition, the insulating top cover 100 is provided with an injection hole 110. During the production of the single cell, electrolyte can be injected into the cell through the injection hole 110. The explosion-proof valve 200 can be inserted into the injection hole 110 and removably connected to the inner wall of the injection hole 110. In some embodiments, the two poles 300 can be symmetrically located on either side of the injection hole 110 and spaced apart from the injection hole 110.

[0048] In this application, the explosion-proof valve 200 is positioned at the injection port 110 and is detachably connected to the inner wall of the injection port 110, thereby integrating the injection port 110 and the explosion-proof valve 200 into the same location on the insulating top cover 100. This facilitates assembly and disassembly of the explosion-proof valve 200, simplifies the assembly process, and reduces assembly costs. This eliminates the need for a separate explosion-proof valve 200 on the insulating top cover 100, further reducing the manufacturing cost of the battery top cover 1000. Furthermore, this improves the space utilization of the battery top cover 1000.

[0049] like Figure 1 and Figure 2 As shown, in some embodiments, the insulating cap 100 may be configured with a first side 101 and a second side 102 disposed opposite to each other. In use, the first side 101 may be close to the inner side of the battery cell, and the second side 102 may be in contact with the external environment.

[0050] like Figure 1 、 Figure 2 and Figure 4 As shown, in this embodiment, the injection hole 110 can penetrate the insulating top cover 100 along the thickness direction of the battery top cover 1000 and connect the first side 101 and the second side 102 of the insulating top cover 100. The inner wall of the injection hole 110 can be configured with an internal thread 111, and the explosion-proof valve 200 can be detachably connected to the inner wall of the injection hole 110 through a threaded connection. At the same time, the connection between the explosion-proof valve 200 and the inner wall of the injection hole 110 can also be sealed to prevent leakage.

[0051] In other embodiments, the explosion-proof valve 200 can also be detachably connected to the inner wall of the liquid injection hole 110 by snap-fitting or the like. At the same time, a sealing structure such as a sealing ring can be configured between the explosion-proof valve 200 and the inner wall of the liquid injection hole 110 to achieve sealing of the connection position and prevent leakage.

[0052] like Figure 2 、 Figure 4 and Figure 5 As shown, in some embodiments, the explosion-proof valve 200 may include an explosion-proof valve body 210 and a breathable filter membrane assembly 220. The explosion-proof valve body 210 may be generally cylindrical in structure. The circumference of the explosion-proof valve body 210 may be configured with external threads 211 that mate with the internal threads 111. The explosion-proof valve body 210 may be connected to the internal threads 111 of the injection hole 110 via the external threads 211, achieving a detachable connection between the explosion-proof valve 200 and the inner wall of the injection hole 110. This facilitates disassembly and assembly of the explosion-proof valve 200 for replacement, ensuring the safe use of the single battery.

[0053] In this embodiment, the explosion-proof valve body 210 further includes a connected exhaust channel 212 and an exhaust hole 213. The exhaust hole 213 can be located near the second side 102 of the insulating cover 100 and communicate with the external environment. The exhaust channel 212 can be located on the side of the exhaust hole 213 facing the first side 101 and can communicate with the first side 101 of the insulating cover 100. In other words, the interior of the single battery can be connected to the external environment through the exhaust channel 212 and the exhaust hole 213, respectively, to achieve pressure relief.

[0054] In some embodiments, the exhaust holes 213 can be provided in one, two, four, or five numbers as needed, without any specific limitation, and can achieve a pressure relief function when necessary. It is understood that each exhaust hole 213 is connected to the exhaust channel 212.

[0055] The filter membrane assembly 220 can be disposed in the exhaust passage 212. In some embodiments, the filter membrane assembly 220 may include a drying membrane 221, an oil-blocking membrane 222, and a water-blocking membrane 223, each of which is provided as a single unit. The drying membrane 221, the oil-blocking membrane 222, and the water-blocking membrane 223 are all air-permeable, allowing air to pass through smoothly. This allows the explosion-proof valve 200 to successfully perform its pressure relief function when necessary, reducing the probability of safety accidents such as single-cell explosions. In this embodiment, the drying membrane 221, the oil-blocking membrane 222, and the water-blocking membrane 223 can be sequentially spaced along the axial direction of the explosion-proof valve body 210 in the exhaust passage 212, with the drying membrane 221 positioned near the exhaust hole 213. The axial direction of the explosion-proof valve body 210 can be parallel to the thickness of the battery cover 1000.

[0056] In this embodiment, the desiccant film 221 can be used to prevent moisture from the external environment from entering the individual cells through the explosion-proof valve 200, thereby causing moisture damage to the individual cells. The oil-isolating film 222 can be used to prevent the oil-based electrolyte in the individual cells from leaking out of the individual cells through the explosion-proof valve 200. The water-isolating film 223 can be used to prevent the aqueous electrolyte in the individual cells from leaking out of the individual cells through the explosion-proof valve 200.

[0057] In other embodiments, the filter membrane group 220 may also include any one or two of the drying membrane 221 , the oil-isolating membrane 222 , and the water-isolating membrane 223 .

[0058] In other embodiments, the drying film 221 , the oil-isolating film 222 and the water-isolating film 223 may be provided in numbers of two, three or five as required.

[0059] Of course, in other embodiments, the filter membrane group 220 may also include other functional membranes, such as a dust-proof membrane.

[0060] like Figure 2 and Figure 5 As shown, the inner wall of the explosion-proof valve body 210 facing the exhaust channel 212 can be configured with an annular mounting groove 214, and the mounting groove 214 can be connected to the exhaust channel 212. In the embodiment, the number of mounting grooves 214 can be set according to the number of membranes in the filter membrane group 220.

[0061] For example, when the filter membrane assembly 220 includes a drying membrane 221, an oil-isolating membrane 222, and a water-isolating membrane 223, the inner wall of the explosion-proof valve body 210 facing the exhaust passage 212 may be configured with three mounting grooves 214. The three mounting grooves 214 may be sequentially spaced along the axial direction of the explosion-proof valve body 210, and the drying membrane 221, the oil-isolating membrane 222, and the water-isolating membrane 223 may be mounted in a one-to-one correspondence within the three mounting grooves 214. Taking the drying membrane 221 as an example, the edge of the drying membrane 221 may be embedded in the corresponding mounting groove 214 and fixed relative to the inner wall of the mounting groove 214.

[0062] In some embodiments, when manufacturing explosion-proof valve 200, the individual membranes of filter membrane assembly 220 can first be placed as required in a mold for injection-molding explosion-proof valve body 210, and then the molding material for explosion-proof valve body 210 can be poured into the mold. This allows the explosion-proof valve body 210 and filter membrane assembly 220 to be injection-molded into an integrated structure, improving the stability of the filter membrane assembly 220 within the explosion-proof valve body 210 and enhancing structural performance. Furthermore, this can streamline the manufacturing process for explosion-proof valve 200 and improve its manufacturing efficiency.

[0063] like Figures 1 to 4 as well as Figure 6 and Figure 7 As shown, in the embodiment, the structures and installation methods of the two poles 300 can be the same.

[0064] In some embodiments, the insulating cover 100 may be provided with an assembly hole 120 that extends through the insulating cover 100 along its thickness, i.e., the assembly hole 120 is a through hole. The pole 300 may be disposed in the assembly hole 120 and fixedly connected to the inner wall of the assembly hole 120.

[0065] Furthermore, the seal between the terminal post 300 and the insulating cap 100 prevents the electrolyte in the individual cells from leaking outward through the gap between the terminal post 300 and the inner wall of the assembly hole 120. This also prevents water vapor from the external environment from entering the individual cells through the gap between the terminal post 300 and the inner wall of the assembly hole 120, potentially damaging the individual cells.

[0066] In some embodiments, an annular assembly groove 310 may be defined on a side of the terminal 300 facing the first side 101 of the insulating top cover 100, with the opening of the assembly groove 310 facing the first side 101. Furthermore, the battery top cover 1000 further includes a sealing ring 400, which may be embedded in the assembly groove 310. When the sealing ring 400 is not subject to external forces, the sealing ring 400 may protrude relative to the opening of the assembly groove 310.

[0067] In some embodiments, the inner wall of the assembly hole 120 may be provided with an annular limiting edge 121 protruding therefrom. The limiting edge 121 may be located at the end of the assembly hole 120 near the first side 101. When the terminal 300 is installed in the assembly hole 120, the end of the sealing ring 400 away from the bottom of the assembly groove 310 may abut against the side of the limiting edge 121 facing away from the first side 101, and the sealing ring 400 may be compressed between the terminal 300 and the limiting edge 121. This ensures a seal at the connection between the terminal 300 and the insulating cover 100.

[0068] In some embodiments, the pole 300 can be connected to the insulating top cover 100 by injection molding. Specifically, the sealing ring 400 can be placed in the assembly groove 310 of the pole 300. Subsequently, the pole 300 and the sealing ring 400 can be placed together in the injection mold of the insulating top cover 100, so that the sealing ring 400 is compressed between the pole 300 and the injection mold, and the pole 300 and the injection mold are fixed. Thereafter, plastic is poured into the injection mold to form the insulating top cover 100, and the injection molding connection between the pole 300 and the insulating top cover 100 can be achieved. This improves the stability of the connection between the pole 300 and the insulating top cover 100 and reduces the probability of the pole 300 detaching from the insulating top cover 100 at will. At the same time, the sealing effect of the connection between the pole 300 and the insulating top cover 100 can be further improved, reducing the probability of leakage.

[0069] In some embodiments, an internal thread groove 330 is further defined at one end of the terminal 300 adjacent to the second side 102 of the insulating cap 100. Specifically, the internal thread groove 330 is located slightly away from the sealing ring 400 on the terminal 300. The open side of the internal thread groove 330 may face the second side 102. The internal thread groove 330 can be used to connect the terminal 300 to an external device. During use, an external device can be threaded into the internal thread groove 330 of the terminal 300, achieving both a mechanical and electrical connection.

[0070] In some embodiments, at least one rib 122 is protruding from the inner wall of the assembly hole 120, and the rib 122 may extend along the axial direction of the assembly hole 120. That is, the rib 122 is parallel to the axial direction of the assembly hole 120, and the axial direction of the assembly hole 120 may be parallel to the thickness direction of the insulating top cover 100.

[0071] At least one limiting groove 320 is provided on one side of the pole 300 facing the inner wall of the assembly hole 120, and the limiting groove 320 can be adapted to the rib 122. In an embodiment, at least one rib 122 can be inserted into at least one limiting groove 320 in a one-to-one correspondence. It is understandable that the rib 122 can fit with the inner wall of the limiting groove 320 to achieve circumferential limitation along the pole 300. In this way, the torsion resistance of the pole 300 can be improved, and the probability of the pole 300 becoming loose or breaking in later use can be reduced. For example, when the pole 300 is connected to an external device, the probability of the pole 300 becoming loose or breaking during the screw connection process can be reduced.

[0072] In some embodiments, four ribs 122 may be protruding from the inner wall of the assembly hole 120, and the four ribs 122 are evenly spaced along the circumference of the assembly hole 120. Four limiting grooves 320 are formed on the side of the pole 300 facing the inner wall of the assembly hole 120, and the four ribs 122 are inserted into the four limiting grooves 320 in a one-to-one correspondence.

[0073] In other embodiments, the ribs 122 and the limiting grooves 320 may also be arranged in one, two, three, or five groups. When the ribs 122 and the limiting grooves 320 are arranged in multiple groups, they may be evenly distributed along the circumference of the pole 300 .

[0074] In other embodiments, the ribs 122 may be protrudingly provided on the circumference of the pole 300 , and the limiting grooves 320 may be provided on the inner wall of the assembly hole 120 .

[0075] In some embodiments, the second side 102 of the insulating cap 100 is further provided with two identification portions 130. The two identification portions 130 can be provided on one side of the two poles 300 in a one-to-one correspondence and can be used to mark the positive and negative polarity of the two poles 300. It is understood that one identification portion 130 can be "+" and the other identification portion 130 can be "-".

[0076] The embodiment further provides a single battery, which may include the battery top cover 1000 provided in the embodiment.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery top cover, characterized in that: Including insulating top cover, explosion-proof valve and pole; The pole is connected to the insulating top cover; A liquid injection hole is provided on the insulating top cover, and the explosion-proof valve is passed through the liquid injection hole and is detachably connected to the inner wall of the liquid injection hole.

2. The battery top cover according to claim 1, characterized in that: The explosion-proof valve is threadedly connected to the inner wall of the liquid injection hole.

3. The battery top cover according to claim 1 or 2, characterized in that: The explosion-proof valve comprises an explosion-proof valve body and a filter membrane group with air permeability; The explosion-proof valve body is provided with an exhaust passage and an exhaust hole which are connected to each other. The exhaust hole is located at one axial end of the explosion-proof valve body and is connected to the external environment. The filter membrane group is arranged in the exhaust channel.

4. The battery top cover according to claim 3, characterized in that: The filter membrane group includes at least one of a drying membrane, an oil-isolating membrane and a water-isolating membrane; When the filter membrane group includes the drying membrane, the oil-isolating membrane and the water-isolating membrane at the same time, the drying membrane, the oil-isolating membrane and the water-isolating membrane are sequentially spaced apart along the axial direction of the explosion-proof valve body, and the drying membrane is arranged close to the exhaust hole.

5. The battery top cover according to claim 1, characterized in that: An assembly hole is provided in the insulating top cover, and the pole is arranged in the assembly hole and is connected to the insulating top cover by injection molding.

6. The battery top cover according to claim 5, characterized in that: The insulating top cover includes a first side, and an annular limiting edge is protruded from the inner wall of the assembly hole, and the limiting edge is located at an end of the assembly hole close to the first side; The pole is provided with an annular assembly groove facing the first side; The battery top cover further includes a sealing ring, which is embedded in the assembly groove and abuts against a side of the limiting edge away from the first side.

7. The battery top cover according to claim 5 or 6, characterized in that: The insulating top cover further includes a second side, and the pole is further provided with an internal thread groove facing the second side.

8. The battery top cover according to claim 7, characterized in that: The inner wall of the assembly hole and the side of the pole facing the inner wall of the assembly hole, one of which is protruding with at least one rib, and the other is provided with at least one limiting groove, the rib is parallel to the axial direction of the assembly hole, and the at least one rib is inserted into the at least one limiting groove in a one-to-one correspondence.

9. The battery top cover according to claim 8, characterized in that: The inner wall of the assembly hole is provided with four ribs protruding therefrom, and the four ribs are evenly spaced along the circumference of the assembly hole; Four limiting grooves are provided on one side of the pole facing the inner wall of the assembly hole, and the four ribs are inserted into the four limiting grooves in a one-to-one correspondence.

10. A single cell battery, characterized in that: The battery comprises a battery top cover according to any one of claims 1 to 9.

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