Battery cell, battery module and electric device

Abstract

The application provides an electric core, a battery module and a power utilization device, and relates to the technical field of electric cores. The electric core comprises a shell, an electrode assembly, a top cover and an insulating support. The shell is internally provided with a containing cavity. The electrode assembly is assembled in the containing cavity. The top cover is assembled on the shell to assemble the electrode assembly in the containing cavity. The top cover comprises a base plate and a pole post assembly penetrating through the base plate. The pole post assembly comprises a tab connecting portion. The electrode assembly is provided with a tab on a side facing the top cover. The tab is connected to the tab connecting portion. The insulating support is arranged between the top cover and the electrode assembly. The insulating support abuts against the electrode assembly other than the tab. The insulating support abuts against the electrode assembly other than the tab. When the electric core is inverted, the electrode assembly arranged in the containing cavity of the shell is subjected to gravity. The insulating support abuts against the electrode assembly, so that the tab is prevented from being subjected to the force of the electrode assembly and the problem of the tab being inserted into the electrode assembly is avoided.

Description

Technical Field

[0001] This invention relates to the field of battery cell technology, specifically to a battery cell, a battery module, and an electrical device. Background Technology

[0002] Lithium-ion batteries are widely used in 3C (computers, communications, and consumer electronics) fields, energy storage, and electric vehicles due to their high energy density, stable and reliable electrochemical energy storage capacity, relatively low cost, and mature technology. Especially in the automotive sector, electric vehicles are increasingly favored by the market due to their low carbon emissions and novel driving experience; however, their relatively short driving range has always been a concern. In recent years, simplifying the structure of power battery packs has significantly improved their specific energy. The industry has begun to integrate high-voltage connection lines and thermal runaway venting channels to improve volume utilization. Thermal runaway venting channels are usually located below the battery cells, requiring the existing cell terminals to be flipped downwards, i.e., the battery is inverted to improve the space utilization of the battery pack. However, when existing cells are inverted, the tabs can easily insert into the electrode assembly body, leading to short circuits. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention provides a battery cell, a battery module and an electrical device to improve the technical problem that when the existing battery cell is installed upside down, the tabs are easily inserted into the electrode assembly body, causing a short circuit in the battery cell.

[0004] To achieve the above and other related objectives, the present invention provides a battery cell. The battery cell includes a housing, an electrode assembly, a top cover, and an insulating support. The housing has a receiving cavity, the electrode assembly is assembled within the receiving cavity, and the top cover is assembled onto the housing to assemble the electrode assembly within the receiving cavity. The top cover includes a substrate and electrode post assemblies passing through the substrate. The electrode post assembly includes a tab connection portion. A tab is provided on the side of the electrode assembly facing the top cover and is connected to the tab connection portion. The insulating support is disposed between the top cover and the electrode assembly, and abuts against the electrode assembly outside the tab.

[0005] In an exemplary embodiment of this application, the insulating support includes a first support plate and an extension, wherein the first support plate abuts against the substrate and the extension extends from the first support plate toward the electrode assembly.

[0006] In an exemplary embodiment of this application, a weight-reducing hole is provided on the extension portion.

[0007] In an exemplary embodiment of this application, after the top cover and the housing are assembled, the height of the insulating support shown is compressed by 1 to 3 mm.

[0008] In an exemplary embodiment of this application, the material of the insulating support includes one or more of PPS, PSU, PC, PFA, PBT, PA and PP materials; the material of the insulating support also includes filler, which includes inorganic oxides.

[0009] In an exemplary embodiment of this application, a liquid storage chamber is provided on the top cover, and the liquid storage chamber protrudes from the side opposite to the electrode assembly.

[0010] In an exemplary embodiment of this application, the electrode assembly is covered with an insulating film, and the insulating film is provided with a liquid-absorbing structure. One end of the liquid-absorbing structure is inserted into the liquid storage chamber, and the other end is connected to the insulating film to guide the electrolyte in the liquid storage chamber to the insulating film.

[0011] In an exemplary embodiment of this application, the liquid absorption structure includes a connector and a contact, the contact extending into the liquid storage chamber, and the connector connecting the contact and the insulating film.

[0012] In an exemplary embodiment of this application, both the connector and the contact are braided structures.

[0013] In an exemplary embodiment of this application, the insulating film includes a base film and a particle layer attached to the base film.

[0014] In an exemplary embodiment of this application, the base film material is any one of PMMA, PE, PP, and PET, and the particle layer is PMMA particles attached to the base film.

[0015] This application also provides a battery module, which includes a housing and battery cells having any of the above-mentioned features, with a plurality of battery cells assembled inside the housing.

[0016] This application also provides an electrical device, on which a battery cell according to any of the above-mentioned methods is installed, the battery cell being used to provide electrical energy.

[0017] The beneficial effects of this invention, in combination with existing technologies, are as follows:

[0018] In existing battery cells, when inverted, the tabs can easily insert into the electrode assembly, leading to short circuits and other malfunctions. This application addresses this issue by providing an insulating support between the substrate of the top cover and the electrode assembly. This insulating support rests against the electrode assembly outside the tabs. When the battery cell is inverted, the electrode assembly within the housing cavity is subjected to gravity, and the insulating support rests against the electrode assembly, thus preventing the tabs from being subjected to the force of the electrode assembly and preventing the tabs from inserting into the electrode assembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an exemplary battery cell for this application;

[0021] Figure 2 This is a schematic diagram of an exemplary battery cell structure according to this application;

[0022] Figure 3 This is a schematic diagram of an exemplary top cover structure of this application;

[0023] Figure 4 This is an exemplary top cover structure diagram of this application;

[0024] Figure 5 This is a schematic diagram of an exemplary insulating support structure of this application;

[0025] Figure 6 This is a schematic diagram of an exemplary electrode assembly of this application;

[0026] Figure 7 This is a schematic diagram of an example insulating film structure of this application;

[0027] Figure 8 This is a schematic diagram of an exemplary insulating film liquid-absorbing structure of this application when it is not combined.

[0028] Component designation explanation

[0029] 100. Top cover; 101. Liquid storage tank; 102. Electrode assembly; 103. Explosion-proof valve; 104. Liquid injection hole; 106. Base plate; 107. Insulating support; 1072. Second through hole; 1073. First through hole; 200. Housing; 300. Battery cell body; 310. Electrode assembly; 311. Main body; 312. Electrode tab; 320. Insulating film; 322. Liquid absorption structure; 3221. Connector; 3222. Contact. Detailed Implementation

[0030] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0031] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0032] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of the invention.

[0033] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0034] In this application, "multiple" means two or more (including two).

[0035] To improve the specific energy of battery packs, the industry integrates high-voltage connection lines and thermal runaway venting channels to enhance volume utilization. Existing thermal runaway venting channels are located below the battery cells. Therefore, the industry has begun to explore improving battery pack space utilization by inverting the battery cells. Currently, the battery cell tabs 312 are located on top of the cell. If the cell is directly inverted, the tabs 312 can easily insert into the electrode assembly 310, causing a short circuit inside the cell. An existing method involves using a longer current collector to electrically connect the tabs 312 at one end of the cell to the terminal assembly 102 at the other end. This ensures that when the cell is inverted, the tabs 312 are at the top, preventing them from being forced into the electrode assembly 310. However, the longer current collector needs to penetrate the cell's interior, occupying significant space and affecting the cell's specific energy.

[0036] Please see Figures 1-2 This application provides a battery cell to solve the above-mentioned problems. The battery cell includes a housing 200, a top cover 100, an electrode assembly 310, and an insulating support 107.

[0037] The housing 200 is a hollow structure with an opening on one side, and its interior forms a receiving cavity for accommodating the electrode assembly 310. The housing 200 can be of various shapes, such as a cylinder or a cuboid, and its shape can be determined according to the specific shape of the electrode assembly 310. For example, if the electrode assembly 310 is a cylindrical structure, a cylindrical housing 200 can be selected; if the electrode assembly 310 is a cuboid structure, a cuboid housing 200 can be selected.

[0038] The electrode assembly 310 includes a first electrode, a second electrode, and a spacer, the spacer separating the first and second electrodes. The first and second electrodes have opposite polarities; in other words, one of the first and second electrodes is a positive electrode, and the other is a negative electrode. The first electrode, second electrode, and spacer are all strip-shaped structures, forming a wound or stacked structure. The wound or stacked structure can be cylindrical, flat, or other shapes.

[0039] Please see Figure 6 The electrode assembly 310 is installed into the receiving cavity through the opening of the housing 200. The electrode assembly 310 includes a main body 311 and two tabs 312. The two tabs 312 protrude from the main body 311, one of which is a positive tab 312 and the other is a negative tab 312. Exemplarily, the two tabs 312 extend from the same side of the main body 311, in other words, the positive and negative tabs 312 are disposed on the same side of the main body 311; in other embodiments, the two tabs 312 may protrude from both sides of the main body 311, that is, the positive and negative tabs 312 are respectively disposed on both sides of the main body 311.

[0040] Please see Figures 3-4 The top cover 100 is fitted onto the opening of the housing 200. The top cover 100 cooperates with the housing 200 to enclose the electrode assembly 310 in the receiving cavity and seal the electrolyte in the receiving cavity. Exemplarily, the top cover 100 includes a substrate 106, an electrode post assembly 102, an explosion-proof valve 103, and an injection hole 104. The electrode post assembly 102 passes through the substrate 106 and includes positive and negative electrode post assemblies 102, which are electrically connected to positive and negative tabs 312, respectively. Exemplarily, the electrode post assembly 102 includes a tab connecting portion, and the tabs 312 are connected to the tab connecting portion. Preferably, the tabs 312 are fixedly connected to the tab connecting portion.

[0041] An insulating support 107 is disposed between the top cover 100 and the electrode assembly 310. For example, one side of the insulating support 107 abuts against the electrode assembly 310 other than the tab 312, and the other side abuts against the substrate 106 of the top cover 100. When the battery cell is inverted, the electrode assembly 310 is subjected to gravity. One side of the insulating support 107 abuts against the electrode assembly 310, and the other side abuts against the top cover 100. The insulating support 107 supports the electrode assembly 310, reducing the force on the tab 312, thereby preventing the tab 312 from being inserted into the electrode assembly 310 and preventing a short circuit inside the battery cell.

[0042] For example, the insulating support 107 is provided with a first through hole 1073, which can accommodate the tab 312 and / or the tab connection part. For example, the tab 312 is inserted into the first through hole 1073, and the tab connection part is also inserted into the first through hole 1073. The connection between the tab 312 and the tab connection part is located in the first through hole 1073. There are gaps between the first through hole 1073 and the tab 312 and the tab connection part. There are also gaps at the connection between the first through hole 1073 and the tab 312 and the tab connection part. On the one hand, it is convenient for the tab 312 to connect with the tab connection part. On the other hand, it can accommodate the electrolyte to flow towards the electrode assembly 310 and wet the electrode assembly 310. In one embodiment, the tab 312 penetrates the first through hole 1073, and the first through hole 1073 and the tab 312 are in a clearance fit. This facilitates the electrical connection between the tab 312 and the electrode assembly 102. Furthermore, the gap between the sidewall of the first through hole 1073 and the tab 312 allows electrolyte to flow towards the electrode assembly 310, wetting the electrode assembly 310. In another embodiment, the tab connecting portion penetrates the first through hole 1073 and connects to the tab 312. The first through hole 1073 and the tab connecting portion are in a clearance fit. This facilitates the electrical connection between the tab connecting portion and the tab 312, and the first through hole 1073 allows electrolyte to flow towards the electrode assembly 310, wetting the electrode assembly 310.

[0043] For example, the insulating support 107 includes a first support plate and an extension. The first support plate abuts against the substrate 106 of the top cover 100, and the extension extends from the sidewall of the first support plate toward the electrode assembly 310, abutting against the electrode assembly 310. The extension can be a frame-shaped structure disposed on the sidewall of the first support plate, or a columnar structure, elongated structure, etc., disposed at the bottom of the first support plate. In one embodiment, the extension is a frame-shaped structure disposed on the sidewall of the first support plate, and the extension is also provided with weight-reducing holes. By providing weight-reducing holes on the extension, the weight of the insulating support 107 is reduced while meeting the strength requirements of the insulating support 107.

[0044] Please see Figure 5 In one embodiment, the insulating support 107 is a frame structure. This frame structure can evenly bear the weight of the electrode assembly 310 while avoiding damage to the main body of the electrode assembly 310. In another embodiment, the insulating support 107 is a long strip structure, including a first support plate, a second support plate, and support columns. The support columns are disposed between the first and second support plates. The opposite sides of the first and second support plates abut against the electrode assembly 310 and the substrate 106 of the top cover 100, respectively. This allows the force exerted by the electrode assembly 310 on the insulating support 107 to be evenly distributed, ensuring uniform stress on the supporting surface of the insulating support. By setting the support columns, the weight of the insulating support 107 is reduced while maintaining its load-bearing capacity, thus lowering the overall weight of the battery cell. The support columns are evenly supported between the first and second support plates, forming gaps between them. When the electrolyte wets the battery cell, it is easier for the electrolyte to wet towards the electrode assembly 310.

[0045] For example, after the top cover 100 and the housing 200 are assembled, the height of the insulating support 107 is compressed by 1 to 3 mm. The compression height can be any value from 1 to 3 mm, such as 1 mm, 2 mm, 3 mm, etc. The insulating support 107 is compressed during assembly. In other words, the top cover 100 and the housing 200 provide a pre-tightening force to the insulating support 107, ensuring that when the battery cell is inverted, the deformation of the insulating support 107 is reduced or even not deformed when subjected to the force of the electrode assembly 310. When the pre-tightening force is greater than or equal to the weight of the electrode assembly 310, that is, when the pre-tightening force is greater than or equal to the force of the inverted electrode assembly 310 on the insulating support 107, the compression deformation of the insulating support 107 remains unchanged when the battery cell is inverted. In other words, the force on the tab 312 does not change before and after the battery cell is inverted, thereby avoiding the situation where the tab 312 is inserted into the electrode assembly 310. When the preload is less than the weight of the electrode assembly 310, the insulating support 107 will undergo slight compression deformation after the battery cell is inverted. Compared to the case without preload, the difference in deformation of the insulating support 107 is smaller when there is preload, and the deformation or inversion of the tab 312 is controllable, avoiding the tab 312 from being forced into the electrode assembly 310 due to excessive compression deformation of the insulating support 107. Preferably, after the top cover 100 is assembled with the housing 200, the preload on the insulating support 107 is greater than or equal to the weight of the electrode assembly 310, thereby ensuring that the force on the tab 312 does not change before and after the battery cell is inverted, thus preventing the tab 312 from being inserted into the electrode assembly 310.

[0046] In one embodiment, the tab 312 is provided with a bending portion. The bending portion can be located within the first through hole 1073 or at other positions on the tab 312. When encountering special circumstances such as bumps or drops, due to inertia, the force exerted by the electrode assembly 310 on the insulating support 107 increases. When the insulating support 107 deforms significantly, stress concentrates at the bending portion, making it more prone to deformation. This shortens the vertical height of the tab 312, reduces the force on the tab 312, and prevents the tab 312 from being inserted into the electrode assembly 310. For example, the bending portion can be an arc-shaped bend, or a bend at an acute angle, obtuse angle, etc. The bending method of the bending portion is not limited in this application, as long as it satisfies the requirement of stress concentration at the bending portion under stress and easy deformation.

[0047] For example, the material of the insulating support 107 includes one or more of PPS (polyphenylene sulfide), PSU (polysulfone), PC (polycarbonate), PFA (perfluoropropyl perfluorovinyl ether-polytetrafluoroethylene), PBT (polybutylene terephthalate), PA (nylon), and PP (polypropylene). The material of the insulating support 107 can be any single material mentioned above, such as PPS, PA, PP, etc., or it can be a combination of any two or more of the above materials, such as a combination of PA and PP, a combination of PPS and PSU, a combination of PC, PFA, and PBT, etc.

[0048] For example, the material of the insulating support 107 also includes filler, which includes inorganic oxides. The inorganic oxides are one or more combinations of alumina, silicon dioxide, and silicon nitride. The filler can be any single material mentioned above, or any combination of two or three, such as a combination of alumina and silicon dioxide, a combination of alumina and silicon nitride, or a combination of alumina, silicon dioxide, and silicon nitride. By filling the insulating support 107 with inorganic oxides, the strength of the insulating support 107 can be improved, ensuring the supporting effect.

[0049] When the battery cell is inverted, the electrolyte drips from the electrode assembly 310 to the bottom of the cell. In other words, the electrolyte drips from the electrode assembly 310 to the top cover 100. The top cover 100 is equipped with an explosion-proof valve 103. A significant amount of electrolyte dripping onto the top cover 100 will soak the explosion-proof valve 103. Prolonged immersion in the electrolyte will accelerate the aging of the explosion-proof valve 103, reduce its service life, and may even cause it to fail, affecting the safety of the battery cell. Please refer to [link / reference]. Figure 4 For example, the top cover 100 is provided with a liquid storage chamber 101. The liquid storage chamber 101 protrudes from the side opposite to the electrode assembly 310, and forms a concave shape within the battery cell. When electrolyte drips onto the top cover 100, due to the concave structure of the liquid storage chamber 101, the electrolyte will flow into the liquid storage chamber 101, thereby preventing the electrolyte from soaking the explosion-proof valve 103 and avoiding the problem of accelerated aging of the explosion-proof valve 103 when soaked in electrolyte, thus improving the durability of the inverted lithium-ion battery. In one embodiment, two liquid storage chambers 101 are provided, symmetrically arranged on both sides of the top cover 100, which can effectively improve the efficiency of electrolyte flow into the liquid storage chambers 101 and prevent electrolyte accumulation.

[0050] Please see Figures 4-5For example, the explosion-proof valve 103 can be located at any position on the top cover 100, such as at the end of the top cover 100 or in the central area of ​​the top cover 100. Preferably, the explosion-proof valve 103 is located in the central area of ​​the top cover 100, so that it can more quickly release air and pressure when the battery cell experiences thermal runaway. In one embodiment, the end face of the explosion-proof valve 103 protrudes from the surface of the top cover 100 near the electrode assembly 310. In other words, when the battery cell is inverted, the height of the top surface of the explosion-proof valve 103 is higher than the height of the top surface of the top cover 100 near the electrode assembly 310, further preventing electrolyte from soaking the explosion-proof valve 103, ensuring the service life of the explosion-proof valve 103, and improving the service life of the battery cell.

[0051] For example, a flow channel is provided on the top cover 100 near the electrode assembly 310, and the flow channel is connected to the storage tank 103. By providing a flow channel, the electrolyte dripping onto the top cover 100 can quickly flow into the storage tank 103, thereby preventing electrolyte from accumulating on the top cover 100 and causing immersion in the explosion-proof valve 103. In one embodiment, the depth of the flow channel towards the storage tank 103 is increased, which facilitates the flow of electrolyte in the flow channel into the storage tank 103.

[0052] For example, the electrode assembly 310 is covered with an insulating film 320, and the electrode assembly 310 is formed into the battery cell body 300 after being covered with the insulating film 320. The insulating film 320 can insulate the electrode assembly 310 from the housing 200, preventing the electrode assembly 310 from conducting electricity with the housing 200. On the other hand, the insulating film 320 covering the electrode assembly 310 can protect the electrode assembly 310, preventing scratches, damage, etc. when the electrode assembly 310 is assembled into the housing 200 through the opening.

[0053] For example, an absorbent structure 322 is provided on the insulating membrane 320. One end of the absorbent structure 322 is inserted into the liquid storage tank 101, and the other end is connected to the insulating membrane 320 to guide the electrolyte in the liquid storage tank 101 onto the insulating membrane 320 and wet the electrode assembly 310. Through the capillary action of the insulating membrane 320, the electrolyte dripping into the liquid storage tank 101 can be guided onto the insulating membrane 320. The insulating membrane 320 wraps the electrode assembly 310, and the electrolyte on the insulating membrane 320 wets the electrode assembly 310. This achieves a balance between the electrolyte dripping onto the top cover 100 and collecting in the liquid storage tank 101, and the electrolyte being guided onto the insulating membrane 320 by the absorbent structure 322. This solves the problem that the dripping electrolyte cannot be reabsorbed by the electrode assembly 310, ensuring the stability of the electrolyte in the electrode assembly 310.

[0054] Please see Figure 8For example, the liquid absorption structure 322 includes a connector 3221 and a contact 3222. The contact 3222 extends into the liquid storage tank 101 and absorbs the electrolyte in the liquid storage tank 101. The connector 3221 connects the contact 3222 to the insulating film 320. In one embodiment, the insulating support 107 is provided with a second through hole 1072. The connector 3221 passes through the second through hole 1072 and connects to the insulating film 320. The second through hole 1072 and the connector 3221 are in clearance fit to facilitate the passage of electrolyte through the second through hole 1072. When the electrolyte passes through the second through hole 1072, it will contact the connector 3221, thereby further increasing the contact area between the liquid absorption structure 322 and the electrolyte and improving the absorption efficiency of the electrolyte. The contact 3222 has a large surface area, which can effectively improve the adsorption efficiency of the electrolyte.

[0055] Please see Figure 7 For example, two liquid-absorbing structures 322 are grouped together. After the insulating film 320 covers the electrode assembly 310, the two liquid-absorbing structures 322 are respectively connected to the two opposite large surfaces of the insulating film 320, and the two liquid-absorbing structures 322 are heat-fused together. The two liquid-absorbing structures 322 are grouped together, and the heat-fused contact 3222 is inserted into the liquid storage tank 101. The two connectors 3221 are respectively connected to the two large surfaces of the insulating film 320, and the electrolyte is guided to the large surfaces of the insulating film 320 to facilitate the wetting of the electrode assembly 310.

[0056] For example, both the connector 3221 and the contact 3222 are braided structures. The braided structure can be plain weave, twill weave, etc., and can be selected according to actual needs; this application does not impose any limitations on this. By setting the connector 3221 and the contact 3222 as braided structures, the liquid absorption and conduction capabilities are enhanced, making it easier to adsorb the electrolyte and effectively improving the adsorption efficiency of the electrolyte in the storage tank 101.

[0057] In one embodiment, the insulating film 320 includes a base film and a particulate layer attached to the base film. Exemplarily, the base film material is any one of PMMA (polymethyl methacrylate), PE (polyethylene), PP (polypropylene), and PET (polyethylene terephthalate), and the particulate layer is PMMA particles sprayed onto the surface of the base film. By spraying a particulate layer onto the surface of the base film, the liquid conductivity of the insulating film 320 can be effectively enhanced, allowing the electrolyte conducted by the connector 3221 to be uniformly transferred to the surface of the electrode assembly 310, effectively improving the liquid conductivity efficiency.

[0058] This application also provides a battery module, which includes a housing and battery cells as described above. A plurality of battery cells are assembled in the housing. The battery cells of the battery module can be connected in parallel, in series, or in a mixed manner. Mixed connection of battery cells means that the battery cells are connected in both parallel and series. For example, when the battery module is in use, the battery cells are in an inverted state.

[0059] This application also provides an electrical device, which is equipped with a battery cell as described above. The battery cell is used to provide electrical energy. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0060] This invention provides a battery cell. By providing an insulating support 107, the electrode assembly 310 is supported, reducing the stress on the tabs 312 and preventing them from being inserted into the electrode assembly 310, thus preventing short circuits within the battery cell. A liquid storage chamber 101 is provided on the top cover 100 to collect electrolyte dripping onto the top cover 100, preventing the electrolyte from soaking the explosion-proof valve 103 and extending its service life. A liquid absorption structure 322 is provided to guide the electrolyte in the storage chamber 101 to the insulating film 320, solving the problem of the electrolyte in the storage chamber 101 not being reabsorbed. Therefore, this invention effectively overcomes some practical problems in the prior art and has high utilization value and significance. The above embodiments are merely illustrative of the principles and effects of this invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention shall still be covered by the claims of this invention.

Claims

1. A battery cell, characterized in that, include: A housing, wherein the housing is provided with a receiving cavity; The electrode assembly is assembled within the receiving cavity; A top cover, fitted onto the housing to seal the receiving cavity, the top cover including a base plate and an electrode assembly passing through the base plate; An insulating support is disposed between the substrate and the electrode assembly, with the tab connection portion of the electrode assembly exposed by the insulating support; The electrode assembly has a tab on the side facing the top cover, the tab is connected to the tab connection part, and the insulating support abuts against the electrode assembly outside the tab. An explosion-proof valve is provided on the top cover, and the end face of the explosion-proof valve protrudes from the surface of the top cover near the electrode assembly. The top cover is provided with a liquid storage chamber, which protrudes from the side opposite to the electrode assembly; the liquid storage chamber forms a concave shape inside the battery cell. The electrode assembly is covered with an insulating film, and the insulating film is provided with a liquid-absorbing structure. One end of the liquid-absorbing structure is inserted into the liquid storage chamber, and the other end is connected to the insulating film to guide the electrolyte in the liquid storage chamber to the insulating film.

2. The battery cell according to claim 1, characterized in that, The insulating support includes a first support plate and an extension, the first support plate abutting against the substrate, and the extension extending from the first support plate toward the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The extension is provided with weight reduction holes.

4. The battery cell according to claim 1, characterized in that, After the top cover is assembled with the housing, the height of the insulating support member shown is compressed by 1~3mm.

5. The battery cell according to claim 1, characterized in that, The insulating support is made of one or more of PPS, PSU, PC, PFA, PBT, PA, and PP materials; the insulating support also includes fillers, which include inorganic oxides.

6. The battery cell according to claim 1, characterized in that, The liquid absorption structure includes a connector and a contact, the contact extending into the liquid storage chamber, and the connector connecting the contact to the insulating film.

7. The battery cell according to claim 6, characterized in that, Both the connector and the contact are braided structures.

8. The battery cell according to claim 1, characterized in that, The insulating film includes a base film and a particle layer attached to the base film.

9. The battery cell according to claim 8, characterized in that, The base film material is any one of PMMA, PE, PP, and PET, and the particle layer is PMMA particles attached to the base film.

10. A battery module, the battery module comprising a housing, characterized in that, The battery module further includes the battery cells according to any one of claims 1 to 9, and a plurality of the battery cells are assembled in the housing.

11. An electrical appliance, characterized in that, The electrical device is equipped with a battery cell according to any one of claims 1 to 9, the battery cell being used to provide electrical energy.

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