Cover plate structure, battery cell and electric device

Abstract

The application provides a cover plate structure, a battery cell and an electric device. The cover plate structure comprises a cover plate, an explosion-proof valve and an adsorption and purification module. The cover plate has an explosion-proof hole; the explosion-proof valve is arranged at the explosion-proof hole; and the adsorption and purification module is mounted on the cover plate and located at the exhaust side of the explosion-proof valve. In this way, by arranging the adsorption and purification module and mounting the adsorption and purification module on the cover plate and at the exhaust side of the explosion-proof valve, the adsorption and purification module can adsorb target components in the thermal runaway gas flowing therethrough, thereby being conducive to reducing the harm to the health of pedestrians and reducing the damage to the atmospheric environment.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, specifically to a cover plate structure, a battery cell, 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 welded to the cover plate.

[0003] In the event of thermal runaway of a battery cell, a large amount of thermal runaway gas will be generated inside the casing. This thermal runaway gas can be discharged to the outside of the casing through an explosion-proof valve. However, thermal runaway gas usually contains harmful components. In related technologies, thermal runaway gas is directly released into the atmosphere, which can endanger the health of pedestrians and cause environmental damage. Utility Model Content

[0004] This application provides a cover structure, a battery cell, and an electrical device to address the problem of how to reduce the target components in the thermal runaway gas emitted into the atmosphere during thermal runaway of a battery cell.

[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 a cover plate structure, including: a cover plate, an explosion-proof valve, and an adsorption purification module. The cover plate has explosion-proof holes; the explosion-proof valve is disposed at the explosion-proof holes; the adsorption purification module is installed on the cover plate and located on the exhaust side of the explosion-proof valve.

[0006] In some possible implementations of the first aspect, the adsorption purification module includes an adsorbent, the material of which includes one or more of metal-based adsorbents, activated carbon, carbon nanotubes, and graphene.

[0007] In some possible implementations of the first aspect, the adsorption purification module includes a support and an adsorption element. The support is mounted on the cover plate and located on the exhaust side of the explosion-proof valve; the support has a vent; the adsorption element is disposed on the support, and in a plane parallel to the cover plate, the orthographic projections of the adsorption element, the explosion-proof hole, and the vent overlap.

[0008] In some possible implementations of the first aspect, along the thickness direction of the cover plate, the support includes a plurality of through holes penetrating the support; the plurality of through holes define a vent; and / or, the support is a metal component.

[0009] In some possible implementations of the first aspect, the support includes a support plate having a vent; the number of adsorption elements is two; and an adsorption element is stacked on each side of the support plate along the thickness direction of the cover plate.

[0010] In some possible implementations of the first aspect, the support includes a support plate and a connecting ring. The support plate has a vent; the support plate and the cover plate are spaced apart along the thickness direction of the cover plate; the connecting ring connects the support plate and the cover plate, and the connecting ring surrounds the support plate for one circumference.

[0011] In some possible implementations of the first aspect, the edge of the connecting ring away from the support plate is provided with a flange, which overlaps with the cover plate and is fixedly connected.

[0012] In some possible implementations of the first aspect, the outer surface of the cover plate has a groove surrounding the explosion-proof hole; the flange is located within the groove.

[0013] In some possible implementations of the first aspect, the adsorption purification module and the explosion-proof valve are spaced apart along the thickness direction of the cover plate.

[0014] Secondly, 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] Thirdly, embodiments of this application also provide a battery pack, which includes cells from any of the aforementioned implementations.

[0016] Fourthly, embodiments of this application also provide an electrical device, which includes an electrical main body and a battery pack as described in any of the foregoing implementations.

[0017] The cover plate structure, battery cell, and electrical equipment provided in this application have the following beneficial effects: The cover plate structure provided in this application, by setting an explosion-proof valve at the explosion-proof hole of the cover plate, enables the high-temperature and high-pressure gas inside the battery cell to open the explosion-proof valve and be released to the outside of the battery cell through the explosion-proof hole when the battery cell using this cover plate structure experiences thermal runaway due to mechanical impact, abnormal internal short circuit, or other reasons, thereby ensuring the safety performance of the battery cell.

[0018] Based on this, by setting up an adsorption purification module, which is installed on the cover plate and located on the exhaust side of the explosion-proof valve, the adsorption purification module can adsorb the target components in the thermal runaway gas flowing through it, thereby helping to reduce the harm to pedestrian health and reduce the damage to the atmospheric environment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an electrical device provided for some embodiments of this application.

[0020] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the battery pack of the electrical device.

[0021] Figure 3 for Figure 2 The diagram shows the structural structure of the battery cells in the battery pack.

[0022] Figure 4 for Figure 3 The exploded view of the battery cell shown.

[0023] Figure 5 for Figure 3 The top view of the battery cell shown.

[0024] Figure 6 for Figure 5 The cell shown is a cross-sectional view at the AA line.

[0025] Figure 7 for Figure 6 A magnified view of a portion of circle B in the image.

[0026] Figure 8 for Figure 3 The diagram shows the structure of the adsorption and purification module of the battery cell.

[0027] Explanation of reference numerals in the attached figures: Electrical equipment 1000; battery pack 100; main electrical unit 200; outer casing 20; battery compartment 1001; 10 battery cell; 1 cover structure; 11 cover; 11a explosion-proof hole; 11b settling tank; 12 explosion-proof valve; 2 housing; 3 pole; Adsorption and purification module 13; support component 131; air vent 1311; through hole 1311a; support plate 1312; connecting ring 1313; flange 1314; adsorption component 132. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 height of the first feature is higher than the horizontal height 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 height of the first feature is lower than the horizontal height of the second feature.

[0035] 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 welded to the cover plate.

[0036] It is understandable that in the event of thermal runaway of a battery cell, a large amount of thermal runaway gas will be generated inside the casing. This thermal runaway gas can be discharged to the outside of the casing through an explosion-proof valve. However, thermal runaway gas usually contains harmful components. In related technologies, thermal runaway gas is directly released into the atmosphere, which can endanger the health of pedestrians and cause environmental damage.

[0037] To address the aforementioned issues, this application provides a cover structure, a battery cell, and an electrical device. By installing an adsorption purification module on the exhaust side of the explosion-proof valve, the target components in the thermal runaway gas flowing through the adsorption purification module can be adsorbed, thereby reducing harm to pedestrian health and minimizing damage to the atmospheric environment.

[0038] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Please refer to the following: Figures 3-5 , 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 The exploded view of cell 10 shown; Figure 5 for Figure 3 The top view of the battery cell 10 shown; the battery cell 10 includes a housing 2, an electrode group (not shown in the figure), a cover plate structure 1, and a terminal post 3.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Please continue reading. Figures 3-5 The cover structure 1 includes a cover plate 11 and an explosion-proof valve 12.

[0053] The cover plate 11 is connected to the housing 2 and seals the opening to protect the electrode assembly and prevent electrolyte leakage. Figures 3-5 In 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.

[0054] 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 3In 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.

[0055] 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.

[0056] The cover plate 11 has an explosion-proof hole 11a extending through the cover plate 11 along its thickness direction. The explosion-proof valve 12 is adapted to the shape of the explosion-proof hole 11a, and is connected to the cover plate 11, thus blocking the explosion-proof hole 11a.

[0057] In some embodiments, the inner wall of the explosion-proof hole 11a may be stepped. The dimension of the end of the explosion-proof hole 11a facing the inside of the housing 2 is larger than the dimension of the end of the explosion-proof hole 11a facing the outside of the housing 2. The explosion-proof valve 12 is disposed at the stepped surface of the explosion-proof hole 11a of the cover plate 11 and seals the explosion-proof hole 11a.

[0058] 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.

[0059] Please continue reading. Figures 3-5 The cover structure 1 also includes an adsorption and purification module 13. The adsorption and purification module 13 is installed on the cover 11 and is located on the exhaust side of the explosion-proof valve 12. In this way, when the battery cell 10 experiences thermal runaway, the adsorption and purification module 13 located on the exhaust side of the explosion-proof valve 12 can adsorb the target components in the flowing gas, thereby helping to reduce the harm to pedestrian health and reduce the damage to the atmospheric environment.

[0060] It needs to be explained that the exhaust side of the explosion-proof valve 12 is the side of the explosion-proof valve 12 that is furthest from the interior of the housing 2, for example, as... Figure 3 The W side is shown.

[0061] For example, the target components include one or more of methane, ethane, ethylene, acetylene, propane, propylene, methylacetylene, isobutane, n-butane, isobutene, n-butene, trans-butene, cis-butene, and acetylene, 1,3-butadiene, carbon monoxide, and carbon dioxide.

[0062] It should be noted that the target components are not limited to the above-mentioned components. In some embodiments, the target components may also include hydrogen, oxygen, nitrogen, etc., and this application does not limit them.

[0063] It is understood that hydrogen, oxygen, and nitrogen are not generally considered harmful gases. However, during the accumulation of thermal runaway gases, the temperature inside the battery cell rises significantly and may even be accompanied by combustion. In this case, hydrogen may trigger an explosion of a certain scale, oxygen may act as a combustion aid, and nitrogen may mix and react with other target components to generate new nitrogen-containing pollutants. Therefore, in some embodiments of this application, hydrogen, oxygen, and nitrogen may also be used as target components to reduce the harmfulness of thermal runaway gas emissions.

[0064] Please refer to the following: Figures 6-8 , Figure 6 for Figure 5 The cross-sectional view of cell 10 shown is located at line AA. Figure 7 for Figure 6 A magnified view of a portion of circle B in the image; Figure 8 for Figure 3 The diagram shows the structure of the adsorption purification module 13 of the battery cell 10. The adsorption purification module 13 includes a support member 131 and an adsorption member 132.

[0065] The support member 131 is mounted on the cover plate 11 and is located on the exhaust side W of the explosion-proof valve 12. The support member 131 has a vent 1311. The adsorption member 132 is provided on the support member 131, and the orthographic projections of the adsorption member 132, the explosion-proof hole 11a and the vent 1311 overlap in a plane parallel to the cover plate 11.

[0066] Thus, the support member 131 serves to support the adsorption member 132, facilitating its installation on the cover plate 11. Furthermore, since the orthographic projections of the adsorption member 132, the explosion-proof hole 11a, and the vent 1311 overlap in a plane parallel to the cover plate 11, when the battery cell 10 experiences thermal runaway, thermal runaway gas is generated inside the housing 2. The vent 1311 does not obstruct this gas, allowing it to escape through the vent 1311 and the adsorption member 132 after breaking through the explosion-proof valve and entering the atmosphere. In this situation, the adsorption member 132 can adsorb the target components in the thermal runaway gas, thereby reducing harm to pedestrian health and minimizing damage to the atmospheric environment.

[0067] In other embodiments, the adsorption purification module 13 may not include the support member 131, but may be defined by the adsorption member 132.

[0068] In some embodiments, see Figures 6-8The support member 131 includes a support plate 1312, which has a breathable portion 1311; there are two adsorption members 132; an adsorption member 132 is stacked on each side of the support plate 1312 along the thickness direction of the cover plate 11. In this way, the adsorption efficiency of the adsorption purification module 13 for the target component can be further improved.

[0069] It should be noted that, in a plane parallel to the cover plate 11, the orthographic projections of the two adsorption components 132, the explosion-proof hole 11a, and the support plate 1312 overlap.

[0070] In some embodiments, see Figures 6-8 Along the thickness direction of the cover plate 11, the support member 131 includes a plurality of through holes 1311a penetrating the support member 131; the plurality of through holes 1311a define a vent 1311. Thus, thermal runaway gas inside the battery cell 10 can be discharged to the outside of the battery cell 10 through the plurality of through holes 1311a. By using the plurality of through holes 1311a to define the vent 1311, the structure of the vent 1311 is simple, easy to manufacture, and helps to reduce the manufacturing cost of the support member 131. Furthermore, the portion of the support member 131 located between the plurality of through holes 1311a can provide uniform support and fixation for the adsorbent 132, thereby improving the reliability of the support and fixation of the adsorbent 132. Consequently, when thermal runaway gas is ejected through the explosion-proof hole 11a, it can at least to some extent prevent the adsorbent 132 from failing due to damage or deformation.

[0071] The vent 1311 is not limited to the through hole 1311a described above. In some embodiments, the vent 1311 may also be defined by a loosely porous structure on the support member 131. For example, the vent 1311 may be honeycomb-shaped, sponge-shaped, or other similar shapes, which are not limited in this application.

[0072] In some embodiments, the material of the adsorbent 132 includes one or more of metal-based adsorbent materials, activated carbon, carbon nanotubes, and graphene. It is understood that metal-based adsorbent materials, activated carbon, carbon nanotubes, and graphene, due to their high specific surface area, porous structure, and surface functional groups, can efficiently capture target components (such as various organic components) in thermally runaway gases.

[0073] It should be noted that metal-based adsorbent materials refer to adsorbent materials in which metals and their compounds are supported on activated carbon or molecular sieves with high specific surface area. For example, metal-based adsorbent materials include: adsorbent materials in which copper or copper compounds are supported on activated carbon or molecular sieves with high specific surface area, metal-organic framework compound materials, and metal oxide semiconductor materials, or one or more of these.

[0074] It is understandable that the adsorbent 132, made of one or more of metal-based adsorbent materials, activated carbon, carbon nanotubes and graphene, can effectively adsorb the target components in thermally runaway gases, thereby helping to reduce the harm to pedestrian health and reduce the damage to the atmospheric environment.

[0075] In some embodiments, the support member 131 is a metal component. This allows the support member 131 to maintain sufficient structural strength when thermal runaway gas is ejected from the explosion-proof hole 11a, thus providing strong support for the adsorption member 132 and preventing deformation and failure of the adsorption member 132. Furthermore, metal is more heat-resistant, resulting in a longer service life for the support member 131.

[0076] For example, the support member 131 can be an aluminum alloy structural component, which helps to reduce the weight of the battery cell 10 and the electrical equipment 1000 while ensuring that the support member 131 has a certain structural strength. Alternatively, the support member 131 can also be a stainless steel structural component, so that the support member 131 has higher strength, which in turn makes the battery cell 10 have higher strength.

[0077] In some embodiments, such as Figure 7 As shown, the adsorption purification module 13 and the explosion-proof valve 12 are spaced apart along the thickness direction of the cover plate 11. It is understood that when the battery cell 10 is in a thermal runaway state, a large amount of thermal runaway gas is generated inside the housing 2. Under the pressure of the thermal runaway gas, the explosion-proof valve 12 will open towards the exhaust side. Therefore, by spaced apart the adsorption purification module 13 and the explosion-proof valve 12, the explosion-proof valve 12 can be fully opened when the battery cell 10 experiences thermal runaway, avoiding interference between the explosion-proof valve 12 and the adsorption purification module 13 when open, which helps improve the exhaust efficiency of the explosion-proof valve 12.

[0078] In some embodiments, such as Figure 7 and Figure 8 As shown, the support member 131 also includes a connecting ring 1313. Along the thickness direction of the cover plate 11, the support plate 1312 is spaced apart from the cover plate 11. The connecting ring 1313 connects the support plate 1312 and the cover plate 11, and surrounds the support plate 1312. It can be understood that the connecting ring 1313 can space the support plate 1312 and the cover plate 11 by a certain distance along the thickness direction of the cover plate 11, thereby allowing the explosion-proof valve 12 to fully open in the event of thermal runaway of the battery cell 10, avoiding interference between the explosion-proof valve 12 and the support plate 1312 when open, and improving the venting efficiency of the explosion-proof valve 12.

[0079] For example, the connecting ring 1313 and the support plate 1312 can be integrally formed, or the connecting ring 1313 and the support plate 1312 can be fixedly connected by welding. This application does not limit this.

[0080] In some embodiments, such as Figure 7 and Figure 8 As shown, the edge of the connecting ring 1313 away from the support plate 1312 is provided with a flange 1314, which overlaps with the cover plate 11 and is fixedly connected. This helps to increase the overlapping area between the support member 131 and the cover plate 11, thereby improving the reliability and stability of the connection between the support member 131 and the cover plate 11.

[0081] For example, the flange 1314 is fixedly connected to the cover plate 11 by welding. In this way, by setting the flange 1314, the welding area between the support member 131 and the cover plate 11 can be increased, and the reliability and stability of the connection between the support member 131 and the cover plate 11 can be improved.

[0082] In some embodiments, such as Figure 4 and Figure 7 As shown, the outer surface of the cover plate 11 (i.e., the surface of the cover plate 11 away from the housing 2) has a recessed groove 11b, which surrounds the explosion-proof hole 11a. A flange 1314 is located within the recessed groove 11b. By providing the recessed groove 11b, the positioning accuracy of the support member 131 relative to the explosion-proof hole 11a is improved, and the assembly efficiency of the cover plate structure 1 is also improved. Furthermore, it helps to reduce the overall thickness of the cover plate 11 and the adsorption purification module 13, thereby allowing for a larger housing and the electrode assembly located within the housing without changing the size of the battery cell, thus increasing the battery cell capacity.

[0083] For example, the shape of the flange 1314 is adapted to the inner contour of the sink 11b, thereby facilitating the positioning and installation of the support 131 into the sink 11b.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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. A cover plate structure for a battery cell, characterized in that, include: Cover plate, the cover plate having explosion-proof holes; An explosion-proof valve is provided at the explosion-proof port; An adsorption purification module is installed on the cover plate and located on the exhaust side of the explosion-proof valve.

2. The cover plate structure of the battery cell according to claim 1, characterized in that, The adsorption purification module includes an adsorption element, and the material of the adsorption element includes one or more of metal-based adsorption materials, activated carbon, carbon nanotubes, and graphene.

3. The cover plate structure of the battery cell according to claim 1, characterized in that, The adsorption purification module includes: A support member, mounted on the cover plate and located on the exhaust side of the explosion-proof valve; the support member having a vent; and An adsorption element is disposed on the support element, and in a plane parallel to the cover plate, the orthographic projections of the adsorption element, the explosion-proof hole, and the ventilated part overlap.

4. The cover plate structure of the battery cell according to claim 3, characterized in that, Along the thickness direction of the cover plate, the support member includes a plurality of through holes penetrating the support member; the plurality of through holes define the vent portion; and / or, The support member is a metal component; and / or, The support member includes a support plate having the ventilated portion; the number of adsorption elements is two; along the thickness direction of the cover plate, an adsorption element is stacked on each side of the support plate.

5. The cover plate structure of the battery cell according to claim 3, characterized in that, The support member includes: A support plate having the vent; the support plate and the cover plate are spaced apart along the thickness direction of the cover plate; and A connecting ring is provided between the support plate and the cover plate, and the connecting ring surrounds the support plate.

6. The cover plate structure of the battery cell according to claim 5, characterized in that, The connecting ring has a flange on its edge away from the support plate, and the flange is stacked with the cover plate and fixedly connected.

7. The cover plate structure of the battery cell according to claim 6, characterized in that, The outer surface of the cover plate has a groove, which surrounds the explosion-proof hole; the flange is located inside the groove.

8. The cover plate structure of the battery cell according to claim 1, characterized in that, Along the thickness direction of the cover plate, the adsorption purification module and the explosion-proof valve are spaced apart.

9. A battery cell, characterized in that, include: A housing having an opening; A cover plate structure, wherein the cover plate structure is any one of the cover plate structures of claims 1-8, the cover plate structure being connected to the housing and sealing the opening.

10. An electrical appliance, characterized in that, include: Electricity-consuming entities; as well as A battery pack, the battery pack comprising battery cells, the battery cells being the battery cells of claim 9.

Images