Explosion-proof valve, cover plate structure, battery cell, battery pack and electric device
Patent Information
- Application Number
- CN202522331017.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-03
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-03
Smart Images
Figure CN224908352U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrical equipment technology, specifically to an explosion-proof valve, a cover structure, a battery cell, a battery pack, and electrical equipment. Background Technology
[0002] A battery is a device that provides power to electrical equipment. A battery cell typically includes a casing, electrode arrays, and a cover structure. The electrode arrays are located inside the casing, and the cover structure seals the casing and provides electrical connection between the electrode arrays and external electrical components. The cover structure includes a cover plate and an explosion-proof valve connected to the cover plate.
[0003] In related technologies, the assembly accuracy and efficiency between explosion-proof valves and cover plates are relatively low. Utility Model Content
[0004] This application provides an explosion-proof valve, a cover plate structure, a battery cell, a battery pack, and electrical equipment to solve the problem of low assembly accuracy and efficiency between the explosion-proof valve and the cover plate.
[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: In a first aspect, embodiments of this application provide an explosion-proof valve, comprising: an opening portion and a connecting portion. The opening portion has a disconnectable portion at its edge, extending circumferentially along the opening portion. At least one surface of the connecting portion along the thickness direction of the explosion-proof valve has a buffer groove; the connecting portion has a first positioning structure.
[0006] In some possible implementations of the first aspect, the connecting portion includes a first positioning portion and a second positioning portion. The first positioning portion surrounds the outer periphery of the opening portion and is connected to the opening portion; the second positioning portion surrounds the outer periphery of the first positioning portion and is connected to the first positioning portion, and the thickness of the second positioning portion is less than the thickness of the first positioning portion, so as to define a stepped first positioning structure.
[0007] In some possible implementations of the first aspect, the first positioning portion has a buffer groove; along the thickness direction of the explosion-proof valve, the thickness H1 of the first positioning portion satisfies: 0.5mm≤H1≤1.3mm; the depth h of the buffer groove satisfies: 0.25≤h / H1≤0.75.
[0008] In some possible implementations of the first aspect, along the arrangement direction of the opening and the connecting part, the width W1 of the first positioning part satisfies: 0.3mm≤W1≤1.5mm; the width w of the buffer groove satisfies: 0.1≤w / W1≤0.8.
[0009] In some possible implementations of the first aspect, the second positioning portion has a buffer groove; along the thickness direction of the explosion-proof valve, the thickness H2 of the second positioning portion satisfies: 0.3mm≤H2≤0.8mm; the depth h of the buffer groove satisfies: 0.25≤h / H2≤0.75.
[0010] In some possible implementations of the first aspect, along the arrangement direction of the opening and the connecting part, the width W2 of the second positioning part satisfies: 0.2mm≤W2≤1mm; the width w of the buffer groove satisfies: 0.1≤w / W2≤0.8.
[0011] In some possible implementations of the first aspect, the first positioning portion and the second positioning portion each have a buffer groove.
[0012] Secondly, embodiments of this application also provide a cover plate structure, the cover plate structure including: a cover plate and an explosion-proof valve of any of the aforementioned implementations, the cover plate having an explosion-proof hole and a second positioning structure; a connecting part connected to the cover plate to allow the explosion-proof valve to block the explosion-proof hole; the second positioning structure cooperating with the first positioning structure.
[0013] In some possible implementations of the second aspect, the second positioning structure includes a first region and a second region located on the inner circumferential surface of the explosion-proof hole. The first region and the second region are distributed along the thickness direction of the cover plate. The second region is recessed relative to the first region to form a positioning notch. The positioning notch extends to one end of the cover plate in the thickness direction. Provided that the connecting part includes a first positioning part and a second positioning part, the first positioning part is positioned and engaged with the first region, and the second positioning part is positioned within the positioning notch.
[0014] Thirdly, embodiments of this application also provide a battery cell, comprising: a housing and a cover structure according to any of the foregoing implementations. The housing has an opening. The cover structure is connected to the housing and seals the opening.
[0015] Fourthly, embodiments of this application also provide a battery pack, which includes a casing and battery cells according to any of the foregoing implementations. The battery cells are installed in the casing.
[0016] Fifthly, embodiments of this application also provide an electrical device, which includes an electrical user body and a battery pack according to any of the aforementioned implementations. The battery pack is electrically connected to the electrical user body.
[0017] The explosion-proof valve, cover structure, battery cell, battery pack, and electrical equipment provided in this application have the following beneficial effects: The explosion-proof valve provided in this application, by setting a first positioning structure, can be positioned by the cooperation of the first positioning structure and the second positioning structure on the cover plate when the explosion-proof valve is connected to the cover plate (such as by welding), thereby improving the assembly efficiency and assembly accuracy between the explosion-proof valve and the cover plate. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of an electrical device provided for some embodiments of this application.
[0019] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the battery pack of the electrical device.
[0020] Figure 3 for Figure 2 The diagram shows the structural structure of the battery cells in the battery pack.
[0021] Figure 4 for Figure 3 An exploded view of the cover plate structure shown (also showing the pole).
[0022] Figure 5 for Figure 4 A top view of the cover plate structure shown (also showing the pole).
[0023] Figure 6 for Figure 5 The cover plate structure shown is a cross-sectional view at line AA.
[0024] Figure 7 for Figure 6 A magnified view of the area within box B.
[0025] Figure 8 for Figure 7 A schematic diagram of the cover plate in the middle.
[0026] Explanation of reference numerals in the attached figures: Electrical equipment 1000; battery pack 100; main electrical unit 200; outer casing 20; battery compartment 1001; Battery cell 10; cover structure 1; cover 11; explosion-proof hole 11a; second positioning structure 11b; first area 11b1; second area 11b2; positioning notch 11b3; housing 2; pole post 3; cover plate 13; Explosion-proof valve 12; opening part 121; disconnection part 1211; connecting part 122; buffer groove 1221; first positioning part 1222; second positioning part 1223; first positioning structure 1224. Detailed Implementation
[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0028] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.
[0029] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0030] In the description of this application, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of this application, "several" means one or more, unless otherwise explicitly specified.
[0031] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.
[0032] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0033] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal level of the first feature is higher than the horizontal level of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal level of the first feature is lower than the horizontal level of the second feature.
[0034] A battery is a device that provides power to electrical equipment. A battery cell typically includes a casing, electrode arrays, and a cover structure. The electrode arrays are located inside the casing, and the cover structure seals the casing and provides electrical connection between the electrode arrays and external electrical components. The cover structure includes a cover plate and an explosion-proof valve fixed to the cover plate.
[0035] In related technologies, the assembly accuracy and efficiency between explosion-proof valves and cover plates are relatively low.
[0036] To address the aforementioned issues, this application provides an explosion-proof valve, a cover structure, a battery cell, a battery pack, and electrical equipment. In the explosion-proof valve, by setting a first positioning structure, when the explosion-proof valve is connected to the cover, the first positioning structure and the second positioning structure on the cover are used for positioning, which can improve the assembly accuracy and efficiency between the explosion-proof valve and the cover.
[0037] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.
[0038] Please see Figure 1 , Figure 1 This is a schematic diagram of an electrical device 1000 provided in some embodiments of this application. Figure 1 In the illustrated embodiment, an electric vehicle is used as an example of the electrical device 1000 for illustrative purposes, which should not be construed as a specific limitation of this application. In other embodiments, the electrical device may also be a mobile phone, a laptop computer, a mobile charging station, or other similar devices.
[0039] Please continue reading. Figure 1 The electrical device 1000 includes a power-consuming body 200 and a battery pack 100. The battery pack 100 is fixed to the power-consuming body 200 and electrically connected to the power-consuming components of the power-consuming body 200 to supply power to the power-consuming components of the power-consuming body 200. Specifically, the power-consuming body 200 may have a battery compartment 1001, and the battery pack 100 is fixed inside the battery compartment 1001.
[0040] Please see Figure 2 , Figure 2 for Figure 1 A cross-sectional structural diagram of the battery pack 100 of the electrical device 1000 shown.
[0041] The battery pack 100 may include a housing 20 and at least one battery cell 10. The battery cell 10 is electrically connected to the aforementioned power-consuming body 200. The battery cell 10 is fixed inside the housing 20, which protects the battery cell 10 from external forces causing vibration and impact that could damage it. The housing 20 may be a metal housing or a plastic housing.
[0042] Cell 10 is the most basic electrochemical unit, capable of storing and releasing electrical energy. Cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment does not limit it to this.
[0043] Figure 2 In the battery pack 100 shown, there are multiple battery cells 10. These multiple battery cells 10 can be electrically connected in series, in parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 10 are connected in both series and parallel relationships, which can be specifically designed according to the power requirements of the electrical device 1000. In some other embodiments, the battery pack 100 may contain only one battery cell 10.
[0044] Please refer to the following: Figure 3 and Figure 4 , Figure 3 for Figure 2 A schematic diagram of the structure of the battery cell 10 in the battery pack 100 shown; Figure 4 for Figure 3 An exploded view of the cover structure shown (also showing the poles); the cell 10 includes a housing 2, a pole group (not shown in the figure), a cover structure 1, and poles 3.
[0045] The housing 2 has a receiving cavity (not shown in the figure) and an opening communicating with the receiving cavity. The receiving cavity is used to receive the electrode assembly and electrolyte, and the opening is used to place the electrode assembly inside the receiving cavity.
[0046] Figure 3 In the illustrated embodiment, the housing 2 can be a rigid component, and the housing 2 can be generally rectangular in shape so that the battery cell 10 is generally rectangular in shape. The housing 2 can be a metal housing.
[0047] In some examples, the housing 2 can be an aluminum alloy housing to make it lighter, which is beneficial for the weight reduction of the battery cell 10, and thus for the overall weight reduction of the electrical equipment 1000. In other examples, the housing 2 can also be a stainless steel housing to make it stronger, which in turn gives the battery cell 10 better overall strength and stronger resistance to puncture and vibration damage. In still other embodiments, the housing 2 can also be a flexible component.
[0048] The electrode assembly is disposed within a receiving cavity and immersed in an electrolyte. The electrode assembly includes a positive electrode (not shown), a negative electrode (not shown), and a separator (not shown). The positive electrode can be formed from a positive current collector and a positive active material coated on the current collector. In some examples, the positive current collector can be aluminum foil, and the positive active material can be lithium cobalt oxide (LCO), ternary materials (NCM / NCA), lithium iron phosphate (LFP), etc. Based on this, the electrode assembly also includes a positive electrode tab (not shown), which is connected to the positive electrode and electrically conductive. Specifically, the positive electrode tab can be fixed to the positive current collector by welding or integrally formed with the positive current collector.
[0049] The negative electrode sheet can be formed from a negative current collector and a negative active material coated on the negative current collector. In some examples, the negative current collector can be copper foil, and the negative active material can be graphite, silicon-carbon composite material, etc. Based on this, the electrode assembly also includes a negative electrode tab (not shown in the figure), which is connected to the negative electrode sheet and is electrically conductive. The negative electrode tab and the positive electrode tab are used to electrically connect the electrode assembly to the circuit. Specifically, the negative electrode tab can be fixed to the negative current collector by welding, or it can be integrally formed with the negative current collector.
[0050] A separator is placed between the positive and negative electrode plates to isolate them and prevent short circuits. The separator can be made of porous polyethylene (PE) or polypropylene (PP), etc.
[0051] Please refer to the following: Figure 5 and Figure 6 , Figure 5 for Figure 4 Top view of the cover plate structure shown (also showing the poles); Figure 6 for Figure 5 The diagram shows a cross-sectional view of cell 10 at the AA line. Please refer to [link / reference]. Figures 3 to 6 The cover structure 1 includes a cover plate 11, an explosion-proof valve 12, and a cover plate 13.
[0052] The cover plate 11 is connected to the housing 2 and seals the opening to protect the electrode assembly and prevent electrolyte leakage. Figure 3 and Figure 4In the illustrated embodiment, the cover plate 11 is generally rectangular flat. In other embodiments, the cover plate 11 may also be circular, triangular, or other shapes.
[0053] The electrode post 3 is disposed on the cover plate 11. Specifically, the cover plate 11 may have an electrode post hole (not shown in the figure). The electrode post 3 may pass through the electrode post hole and be fixed to the cover plate 11. Figure 3 In the embodiment shown, there are two poles 3, which are arranged along the length of the cover plate 11. The aforementioned positive electrode tab is electrically connected to one pole 3, and the aforementioned negative electrode tab is electrically connected to the other pole 3.
[0054] The cover plate 11 can be a metal structural component, connected to the housing 2 by welding, bonding, or snap-fitting. In some examples, the cover plate 11 can be an aluminum alloy structural component, which is beneficial for the weight reduction of the battery cell 10 and the electrical equipment 1000. In other examples, the cover plate 11 can be a stainless steel component, so that the cover plate 11 has high strength, and thus the battery cell 10 has high strength.
[0055] The cover plate 11 has an explosion-proof hole 11a extending through the cover plate 11 along its own thickness direction. The explosion-proof valve 12 is connected to the cover plate 11 and blocks the explosion-proof hole 11a.
[0056] The explosion-proof valve 12 can be a metal structural component. For example, the explosion-proof valve 12 can be an aluminum alloy structural component (such as a manganese-aluminum alloy component), which is beneficial for the weight reduction of the battery cell 10 and the electrical equipment 1000. Alternatively, the explosion-proof valve 12 can also be a stainless steel structural component, so that the explosion-proof valve 12 has higher strength, which in turn makes the battery cell 10 have higher strength.
[0057] In some embodiments, the cover plate 13 is connected to the cover plate 11 and located on the side of the explosion-proof valve 12 away from the center of the housing 2, to cover at least a portion of the explosion-proof valve 12. This prevents external moisture, dust, and other impurities from entering the battery cell 10 through the explosion-proof hole 11a and the explosion-proof valve 12, thus affecting the stability of the battery cell 10's operation. For example, the cover plate 13 is connected to the cover plate 11 by adhesive backing. The cover plate 13 can be a plastic part (such as PET, PC, or PE), thereby reducing the weight of the battery cell 10. In addition, plastic parts have good insulation properties. Therefore, when the battery cell 10 experiences thermal runaway and the thermal runaway gas pushes open the cover plate 13, the plastic cover plate 13, with its own insulation properties, can prevent short circuits from occurring inside the battery cell 10 or between the battery cell and other battery cells, thereby improving the safety performance of the battery cell 10.
[0058] It is understandable that there is a gap between the cover plate 11 and the cover plate 13, so that the cover plate 13 can both satisfy the function of dust prevention and avoid affecting the opening pressure of the explosion-proof valve 12 and the stability of the opening of the explosion-proof valve 12.
[0059] Please refer to the following: Figure 7 , Figure 7 for Figure 6 A magnified view of a portion of box B in the image. The explosion-proof valve 12 includes an opening part 121 and a connecting part 122.
[0060] The opening portion 121 has a section to be broken 1211 at its edge, and the section to be broken 1211 extends circumferentially along the opening portion. For example, a reference line is defined by the midpoint of the line connecting the center of the opening portion 121 and all points on the outer edge of the opening portion 121. The portion of the opening portion 121 located on the reference line away from the center of the opening portion 121 is the edge of the opening portion 121. In some embodiments, the section to be broken 1211 is a groove.
[0061] The connecting part 122 is connected to the opening part 121 and surrounds the outer periphery of the opening part 121. The connecting part 122 is connected to the cover plate 11 so that the explosion-proof valve 12 blocks the explosion-proof hole 11a.
[0062] The connecting part 122 has a first positioning structure 1224. The cover plate 11 has a second positioning structure 11b. Thus, the first positioning structure 1224 can cooperate with the second positioning structure to achieve rapid positioning of the explosion-proof valve 12 relative to the cover plate 11, thereby improving the assembly accuracy and assembly efficiency of the cover plate structure 1.
[0063] In some embodiments, the connecting portion 122 includes a first positioning portion 1222 and a second positioning portion 1223. The first positioning portion 1222 surrounds the outer periphery of the opening portion 121 and is connected to the opening portion 121; the second positioning portion 1223 surrounds the outer periphery of the first positioning portion 1222 and is connected to the first positioning portion 1222, and the thickness H2 of the second positioning portion 1223 is less than the thickness H1 of the first positioning portion 1222, so as to define a stepped first positioning structure 1224.
[0064] Please refer to the following: Figure 8 , Figure 8 for Figure 7 A schematic diagram of the cover plate structure. The second positioning structure 11b includes a first region 11b1 and a second region 11b2 located on the inner peripheral surface of the explosion-proof hole 11a. The first region 11b1 and the second region 11b2 are distributed along the thickness direction of the cover plate 11. The second region 11b2 is recessed relative to the first region 11b1 to form a positioning notch 11b3. The positioning notch 11b3 extends to one end of the cover plate 11 in the thickness direction. The first positioning part 1222 is positioned and engaged with the first region 11b1, and the second positioning part 1223 is positioned within the positioning notch 11b3.
[0065] Thus, while facilitating rapid positioning of the explosion-proof valve 12 relative to the cover plate 11 and improving the assembly accuracy and efficiency of the cover plate structure 1, the first positioning structure 1224 and the second positioning structure 11b have relatively simple structures, are easy to process and manufacture, and help reduce processing and manufacturing costs.
[0066] In addition, in the related technology, laser welding is often used to connect the explosion-proof valve 12 and the cover plate 11 during the production process of the cover plate structure 1. Specifically, the explosion-proof valve 12 is usually placed in the explosion-proof hole 11a first. Then, laser welding is performed on the outer peripheral surface of the explosion-proof valve 12 and the inner peripheral surface of the explosion-proof hole 11a from the starting position along the circumference of the explosion-proof hole 11a. However, when welding at the starting position, the stress generated during welding will cause the explosion-proof valve 12 to move radially away from the starting position relative to the cover plate 11. This causes the end of the explosion-proof valve 12 away from the starting position to be close to the inner peripheral surface of the explosion-proof hole 11a, resulting in a narrower weld at that point. The different melting depths of the weld points around the explosion-proof valve 12 lead to uneven welds between the explosion-proof valve 12 and the cover plate 11, which in turn affects the reliability of the connection between the explosion-proof valve 12 and the cover plate 11, as well as the safety performance of the battery cell 10.
[0067] Therefore, in this embodiment, by setting the thickness H2 of the second positioning portion 1223 to be less than the thickness H1 of the first positioning portion 1222, the first positioning structure 1224 is defined, and the first positioning portion 1222 is positioned and engaged with the first region 11b1. The second positioning portion 1223 is positioned within the positioning notch 11b3. Based on this, when the connecting portion 122 is welded to the cover plate 11, the first region 11b1 can position the first positioning portion 1222 in the arrangement direction of the connecting portion 122 and the opening portion 121, so that the explosion-proof valve 12 will not be displaced relative to the cover plate 11 due to the welding stress. In this case, a more uniform weld can be formed between the explosion-proof valve 12 and the cover plate 11, which is beneficial to improving the consistency of the melting depth of the peripheral portion of the explosion-proof valve 12, thereby improving the structural strength of the explosion-proof valve, improving the reliability of the connection between the explosion-proof valve 12 and the cover plate 11, and thus improving the safety performance of the battery cell 10.
[0068] The construction of the first positioning structure 1224 and the second positioning structure 11b is not limited to this. In other embodiments, a positioning protrusion may be provided on one side surface of the connecting part 122 along the thickness direction of the explosion-proof valve, and a positioning groove or positioning through hole may be provided on the cover plate 11. The positioning protrusion is positioned in conjunction with the groove or positioning through hole.
[0069] It should be noted that the preceding description uses the example of the connection between the connecting part 122 and the cover plate 11 being welded, and does not mean that the connecting part 122 and the cover plate 11 can only be connected by welding. In other embodiments, the connecting part 122 and the cover plate 11 can also be connected by bonding, interference fit, etc., and this application does not limit this.
[0070] In some embodiments, see Figure 7 The connecting part 122 has at least one surface along the thickness direction of the explosion-proof valve 12 with a buffer groove 1221.
[0071] When the explosion-proof valve 12 is connected to the cover plate 11, stress is easily generated at the connection point. Since the disconnectable part 1211 of the explosion-proof valve 12 is relatively close to the connection point between the explosion-proof valve 12 and the cover plate 11, stress will inevitably be released to the disconnectable part 1211. The disconnectable part 1211 is the most likely point on the explosion-proof valve 12 to disconnect in the event of thermal runaway of the battery cell 10. The structural strength of the disconnectable part 1211 itself is not high compared to other parts of the explosion-proof valve 12. In addition, the stress affects the structural strength of the disconnectable part 1211, which leads to a decrease in the stability of the opening pressure of the explosion-proof valve 12, thus affecting the safety performance of the battery cell 10.
[0072] Therefore, a buffer groove 1221 is provided on the connecting part 122. In this case, when the connecting part 122 is connected to the cover plate 11 and stress is generated and transmitted toward the part to be disconnected 1211, the buffer groove 1221 can provide a certain deformation space for the connecting part 122, so that the connecting part 122 can easily deform a certain amount under the action of stress, so that the connecting part 122 can absorb the stress and prevent the stress from being transmitted to the part to be disconnected 1211 and affecting the structural strength of the part to be disconnected 1211. This is beneficial to improving the reliability of the explosion-proof valve 12 and improving the safety performance of the battery cell 10.
[0073] It should be noted that, Figure 7 The illustration is only based on the example of a buffer groove 1221 on the side of the connecting part 122 away from the housing 2, and some embodiments of this application are not limited to this.
[0074] In some embodiments, the side surface of the connecting portion 122 near the housing 2 may have a buffer groove 1221.
[0075] In other embodiments, the connecting portion 122 has buffer grooves 1221 on both sides of the explosion-proof valve 12 along the thickness direction, that is, there are multiple buffer grooves 1221.
[0076] Thus, by forming buffer grooves 1221 on the two opposite surfaces of the connection part 122, more allowance can be provided for the deformation of the explosion-proof valve 12, which can further improve the stress absorption effect of the connection part 122, thereby improving the stability of the opening pressure of the explosion-proof valve 12 and improving the reliability of the explosion-proof valve 12.
[0077] In some embodiments, see Figure 7 Multiple buffer slots 1221 are spaced apart along the arrangement direction of the opening portion 121 and the connecting portion 122.
[0078] In this way, it can prevent any two buffer grooves 1221 from having overlapping areas along the thickness direction of the connecting part 122, which would cause the material thickness of the connecting part 122 between any two buffer grooves 1221 to be too thin, thereby reducing the strength of the connecting part 122. This is beneficial to improving the structural strength of the explosion-proof valve 12 and improving the reliability of the explosion-proof valve 12.
[0079] In some embodiments, see Figure 7 The first positioning portion 1222 has a buffer groove 1221. Along the thickness direction of the explosion-proof valve 12, the thickness H1 of the first positioning portion 1222 satisfies: 0.5mm ≤ H1 ≤ 1.3mm; for example, the thickness H1 of the first positioning portion 1222 is 0.5mm, 0.75mm, 1mm, or 1.3mm. The depth h of the buffer groove 1221 satisfies: 0.25 ≤ h / H1 ≤ 0.75. The ratio of the depth h of the buffer groove 1221 to the thickness H1 of the first positioning portion 1222 is 0.25, 0.35, 0.45, 0.55, or 0.75.
[0080] Understandably, if the ratio of the depth h of the buffer groove 1221 to the thickness H1 of the first positioning portion 1222 is less than 0.25, the depth h of the buffer groove 1221 is too small relative to the thickness H1 of the first positioning portion 1222. This would reduce the deformation capacity of the buffer groove 1221, thereby reducing the buffering effect of the first positioning portion 1222 on the force. If the ratio of the depth h of the buffer groove 1221 to the thickness H1 of the first positioning portion 1222 is greater than 0.75, the ratio of the depth h of the buffer groove 1221 to the thickness H1 of the first positioning portion 1222 is too large, that is, the material thickness at the buffer groove 1221 is too small (e.g., it may be smaller than the material thickness at the part to be disconnected 1211). In this case, the explosion-proof valve 12 may disconnect at the buffer groove 1221 instead of at the part to be disconnected 1211 when the battery cell 10 experiences thermal runaway, resulting in a decrease in the stability of the opening pressure of the explosion-proof valve and affecting the safety performance of the battery cell.
[0081] Therefore, when the ratio of the depth h of the buffer groove 1221 to the thickness H1 of the first positioning part 1222 satisfies: 0.25≤h / H1≤0.75, it is beneficial to improve the buffering effect of the buffer groove 1221 against the force, and the explosion-proof valve 12 can be disconnected at the buffer groove 1221 when the battery cell 10 thermally runs away, thereby improving the safety performance of the battery cell 10.
[0082] In some embodiments, see Figure 7 Along the arrangement direction of the opening portion 121 and the connecting portion 122, the width W1 of the first positioning portion 1222 satisfies: 0.3mm ≤ W1 ≤ 1.5mm; for example, the width W1 of the first positioning portion 1222 is 0.3mm, 0.75mm, 1mm, 1.25mm, or 1.5mm. The width w of the buffer groove 1221 satisfies: 0.1 ≤ w / W1 ≤ 0.8. The ratio of the width w of the buffer groove 1221 to the width W1 of the first positioning portion 1222 is 0.1, 0.25, 0.4, 0.55, or 0.8.
[0083] Understandably, if the ratio of the width w of the buffer groove 1221 to the width W1 of the first positioning portion 1222 is less than 0.1, the width w of the buffer groove 1221 is too small relative to the width W1 of the first positioning portion 1222, which will reduce the buffering effect of the buffer groove 1221 against force. If the ratio of the width w of the buffer groove 1221 to the width W1 of the first positioning portion 1222 is greater than 0.8, the width w of the buffer groove 1221 is too large relative to the width W1 of the first positioning portion 1222, which may affect the structural strength of the first positioning portion 1222.
[0084] Therefore, when the ratio of the width w of the buffer groove 1221 to the width W1 of the first positioning part 1222 satisfies 0.1≤w / W1≤0.8, it is beneficial to improve the buffering effect of the first positioning part 1222 against the force and to ensure the structural strength of the first positioning part 1222.
[0085] In some embodiments, see Figure 7 The second positioning portion 1223 has a buffer groove 1221. Along the thickness direction of the explosion-proof valve 12, the thickness H2 of the second positioning portion 1223 satisfies: 0.3mm ≤ H2 ≤ 0.8mm; for example, the thickness H2 of the second positioning portion 1223 is 0.3mm, 0.4mm, 0.6mm, or 0.8mm. The depth h of the buffer groove 1221 satisfies: 0.25 ≤ h / H2 ≤ 0.75. The ratio of the depth h of the buffer groove 1221 to the thickness H2 of the second positioning portion 1223 is 0.25, 0.35, 0.45, 0.55, or 0.75.
[0086] Similarly, when the ratio of the depth h of the buffer groove 1221 to the thickness H2 of the second positioning part 1223 satisfies: 0.25≤h / H2≤0.75, it is beneficial to improve the buffering effect of the buffer groove 1221 against the force, and the explosion-proof valve 12 can be disconnected at the buffer groove 1221 when the battery cell 10 thermally runs away, thereby improving the safety performance of the battery cell 10.
[0087] In some embodiments, see Figure 7 Along the arrangement direction of the opening portion 121 and the connecting portion 122, the width W2 of the second positioning portion 1223 satisfies: 0.2mm ≤ W2 ≤ 1mm; for example, the width W2 of the second positioning portion 1223 is 0.2mm, 0.4mm, 0.6mm, 0.8mm, or 1mm. The width w of the buffer groove 1221 satisfies: 0.1 ≤ w / W2 ≤ 0.8. The ratio of the width w of the buffer groove 1221 to the width W2 of the second positioning portion 1223 is 0.1, 0.25, 0.4, 0.55, or 0.8.
[0088] Similarly, when the ratio of the width w of the buffer groove 1221 to the width W2 of the second positioning part 1223 satisfies 0.1≤w / W2≤0.8, it is beneficial to improve the buffering effect of the second positioning part 1223 against the force and to ensure the structural strength of the second positioning part 1223.
[0089] In some embodiments, see Figure 7 The first positioning portion 1222 and the second positioning portion 1223 each have a buffer groove 1221. That is, there are multiple buffer grooves 1221. A portion of the multiple buffer grooves 1221 is located in the first positioning portion 1222. Another portion of the multiple buffer grooves 1221 is located in the first positioning portion 1222. This is beneficial to improving the force absorption effect of the connecting portion 122.
[0090] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0091] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.
[0092] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.
[0093] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. An explosion-proof valve, characterized in that, include: An opening portion, wherein the edge of the opening portion has a portion to be disconnected, the portion to be disconnected extending circumferentially along the opening portion; as well as The connecting portion has a buffer groove on at least one surface along the thickness direction of the explosion-proof valve; the connecting portion has a first positioning structure.
2. The explosion-proof valve according to claim 1, characterized in that, The connecting part includes: A first positioning portion surrounds the outer periphery of the opening portion and is connected to the opening portion; and The second positioning portion surrounds the outer periphery of the first positioning portion and is connected to the first positioning portion. The thickness of the second positioning portion is less than the thickness of the first positioning portion, thereby defining the stepped first positioning structure.
3. The explosion-proof valve according to claim 2, characterized in that, The first positioning portion has the buffer groove; Wherein, along the thickness direction of the explosion-proof valve, the thickness H1 of the first positioning portion satisfies: 0.5mm ≤ H1 ≤ 1.3mm; the depth h of the buffer groove satisfies: 0.25 ≤ h / H1 ≤ 0.75; and / or, Wherein, along the arrangement direction of the opening part and the connecting part, the width W1 of the first positioning part satisfies: 0.3mm≤W1≤1.5mm; the width w of the buffer groove satisfies: 0.1≤w / W1≤0.
8.
4. The explosion-proof valve according to claim 2, characterized in that, The second positioning portion has the buffer groove; Wherein, along the thickness direction of the explosion-proof valve, the thickness H2 of the second positioning portion satisfies: 0.3mm ≤ H2 ≤ 0.8mm; the depth h of the buffer groove satisfies: 0.25 ≤ h / H2 ≤ 0.75; and / or, Wherein, along the arrangement direction of the opening part and the connecting part, the width W2 of the second positioning part satisfies: 0.2mm≤W2≤1mm; the width w of the buffer groove satisfies: 0.1≤w / W2≤0.
8.
5. The explosion-proof valve according to claim 2, characterized in that, The first positioning portion and the second positioning portion each have the buffer groove.
6. A cover plate structure, characterized in that, The cover plate structure includes: A cover plate, the cover plate having explosion-proof holes and a second positioning structure; and An explosion-proof valve, wherein the explosion-proof valve is any one of claims 1-5; the connecting part is connected to the cover plate so that the explosion-proof valve blocks the explosion-proof hole, and the second positioning structure cooperates with the first positioning structure.
7. The cover plate structure according to claim 6, characterized in that, The second positioning structure includes a first region and a second region located on the inner peripheral surface of the explosion-proof hole. The first region and the second region are distributed along the thickness direction of the cover plate. The second region is recessed relative to the first region to form a positioning notch. The positioning notch extends to one end of the cover plate in the thickness direction. Provided that the connecting part includes a first positioning part and a second positioning part, the first positioning part is positioned in conjunction with the first area, and the second positioning part is positioned within the positioning notch.
8. A battery cell, characterized in that, include: A housing having an opening; A cover plate structure, wherein the cover plate structure is the cover plate structure according to claim 6 or 7, the cover plate structure is connected to the housing and seals the opening.
9. A battery pack, characterized in that, include: shell; and The battery cell is the battery cell according to claim 8, and the battery cell is installed inside the housing.
10. An electrical appliance, characterized in that, include: Electricity-consuming entities; as well as The battery pack is the battery pack according to claim 9, and the battery pack is electrically connected to the power-consuming body.