Battery cell

Abstract

The utility model discloses a battery cell, which comprises a first main body, a second main body and a third main body, the first main body comprises a first base body and a first active substance, the first base body is provided with a plurality of first through holes which are communicated with one another, and the first active substance is arranged in the first through holes; the second main body is provided with a mounting hole, the first main body is arranged in the mounting hole, the second main body comprises a second base body and a second active substance, the second base body is provided with a plurality of second through holes which are communicated with one another, and the second active substance is arranged in the second through holes. The battery cell disclosed by the utility model can have relatively high manufacturing efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a kind of battery cell. BACKGROUND

[0002] In the related art, the battery cell includes a wound-type battery cell and a laminated-type battery cell. The manufacturing process of the laminated-type battery cell is to coat positive and negative active materials on a foil to form a sheet, and then slit the sheet. After slitting the sheet, the sheet is laminated to form a battery cell. Since the sheet needs to be slit before being laminated to form a battery cell, the manufacturing efficiency of the battery cell is low. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell, which can have high manufacturing efficiency.

[0004] The battery cell according to the embodiments of the utility model includes:

[0005] The first body includes a first base and a first active material. The first base is provided with a plurality of first through holes that are interconnected. The first active material is arranged in the first through holes.

[0006] The second body is provided with a mounting hole. The first body is arranged in the mounting hole. The second body includes a second base and a second active material. The second base is provided with a plurality of second through holes that are interconnected. The second active material is arranged in the second through holes.

[0007] The battery cell according to the embodiments of the utility model has the following beneficial effects: the first body includes a first base and a first active material. After the first active material is arranged in a plurality of first through holes, the first body can act as a positive electrode or a negative electrode of a battery cell. The second body includes a second base and a second active material. After the second active material is arranged in a plurality of second through holes, the second body can act as a positive electrode or a negative electrode of a battery cell. The second body is provided with a mounting hole. The first body can be arranged in the mounting hole. That is, when manufacturing a battery cell, the first body can be placed in the mounting hole of the second body to complete the assembly of the battery cell, which can effectively improve the manufacturing efficiency of the battery cell. Specifically, the battery cell can have high manufacturing efficiency.

[0008] According to some embodiments of the utility model, the first base and the second base are both made of foamed metal.

[0009] According to some embodiments of the utility model, the first active material is a positive electrode material, the second active material is a negative electrode material, and the volume of the first base is smaller than that of the second base.

[0010] According to the battery cell of some embodiments of the present application, the porosities of the first substrate and the second substrate are K, and K is greater than or equal to 90%.

[0011] According to the battery cell of some embodiments of the present application, the battery cell further comprises a first tab, the first substrate is provided with a third through hole, and the first tab is welded to a hole wall of the third through hole.

[0012] According to the battery cell of some embodiments of the present application, the battery cell further comprises a second tab, and the second tab is welded to the second substrate.

[0013] According to the battery cell of some embodiments of the present application, the second tab is welded to an outer circumferential surface of the second substrate.

[0014] According to the battery cell of some embodiments of the present application, the battery cell further comprises a tab adhesive, and the tab adhesive is sleeved on an outer circumferential surface of the second substrate to cover the second tab and the second substrate.

[0015] According to the battery cell of some embodiments of the present application, the battery cell further comprises a diaphragm, and two sides of the diaphragm are connected to the first substrate and the second substrate respectively.

[0016] According to the battery cell of some embodiments of the present application, the pore size distributions of the first substrate and the second substrate are both 100 μm to 500 μm.

[0017] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings and embodiments, in which:

[0019] Figure 1 FIG. 1 is a schematic view of a battery cell of some embodiments of the present application;

[0020] Figure 2 FIG. 2 is an exploded schematic view of the battery cell of some embodiments of the present application;

[0021] Figure 3 FIG. 3 is a schematic view of a first substrate of the battery cell of some embodiments of the present application;

[0022] Figure 4 FIG. 4 is a schematic view of a second substrate of the battery cell of some embodiments of the present application.

[0023] REFERENCE NUMERALS:

[0024] The battery cell 10, the first main body 100, the first base 200, the first through hole 210, the third through hole 220, the second main body 300, the second base 400, the second through hole 410, the mounting hole 500, the first tab 600, the second tab 700, and the tab rubber 800. DETAILED DESCRIPTION

[0025] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0026] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0027] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0028] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0029] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0030] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0031] The battery generally includes a cell. The cell includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0032] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0033] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0034] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0035] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination with two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2(also can be referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2(also can be referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and modified compounds thereof.

[0036] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0037] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0038] As an example, the negative electrode current collector can employ a metal foil, a foam metal or a composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0039] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0040] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0041] As an example, the negative active material can employ a negative active material for a battery that is publicly known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery can also be used. These negative active materials can be used alone or in combination of two or more.

[0042] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0043] In some embodiments, the battery further includes a separator disposed between the positive electrode and the negative electrode.

[0044] In some embodiments, the separator is a separator film. The separator film can be of various types, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0045] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0046] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0047] In some embodiments, the battery further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0048] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluoroboric dioxalate, and lithium tetrafluorophosphoric oxalate.

[0049] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0050] In some embodiments, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, and an ionic liquid-lithium salt.

[0051] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0052] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0053] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0054] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0055] In some embodiments, the battery cell is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0056] In some embodiments, the battery cell is in a stacked structure.

[0057] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0058] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked, and one positive electrode sheet can be clamped between adjacent folded segments.

[0059] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0060] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0061] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0062] In some embodiments, the shape of the battery cell can be cylindrical, flat, or polygonal, etc.

[0063] In some embodiments, the battery cell can be provided with tabs, which can conduct current out of the battery cell. The tabs can include positive tabs and negative tabs.

[0064] In some embodiments, the battery can include a housing. The housing can be used to enclose the battery cell and other components such as electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., copper-aluminum composite case), or an aluminum-plastic film, etc.

[0065] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or other shapes of batteries, which can include but are not limited to a square battery, a blade battery, a polygonal battery, such as a hexagonal battery, etc.

[0066] The battery as referred to in the embodiments of the present application can mean a single physical module including one or more batteries to provide higher voltage and capacity.

[0067] In some embodiments, the battery can be a battery module, and when there are multiple batteries, the multiple batteries can be arranged and fixed to form a battery module.

[0068] In some embodiments, the battery can be a battery pack, which can include a box and batteries, and the batteries or battery modules can be contained in the box.

[0069] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0070] The embodiments of the present application provide a power consuming device using a battery as a power source. The power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0071] In the related art, an electric core includes a winding type electric core and a laminated type electric core. The manufacturing process of the laminated type electric core is to coat positive and negative active materials on a foil to form a pole piece, and then slit the pole piece. After the pole piece is slit, the pole pieces are laminated to form an electric core. Since the pole pieces need to be slit before being laminated to form the electric core, the manufacturing efficiency of the electric core is low. Therefore, the present application provides an electric core.

[0072] Please refer to Figures 1 to 4In some embodiments, the battery cell 10 includes a first body 100 and a second body 300. The first body 100 includes a first base 200 and a first active material. The shape of the first body 100 is not limited, for example, the cross-sectional shape of the first body 100 can be rectangular, square or circular. The first base 200 is provided with a plurality of first through holes 210 that are in communication with each other, and the first active material is disposed in the first through holes 210. The plurality of first through holes 210 can be uniformly distributed or not uniformly distributed. Specifically, after the first base 200 is provided with the plurality of first through holes 210, the first active material can be accommodated in the first through holes 210. The first active material can include at least one of lithium-containing phosphates, lithium transition metal oxides and modified compounds thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as positive active materials of batteries can also be used. These positive active materials can be used alone or in combination with two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333 for short), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523 for short), LiNi0.5Co0.25Mn0.25O2 (also referred to as NCM211 for short), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622 for short), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811 for short), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2), and modified compounds thereof. The first active material can also include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate and the like. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds and tin alloys. That is, according to the different first active materials, when the first active material is placed in the first through holes 210, the first body 100 can act as a positive electrode or a negative electrode of the battery cell 10.

[0073] The second body 300 is provided with a mounting hole 500 in which the first body 100 is disposed. The mounting hole 500 can be a through hole that penetrates from the middle of the second body 300 so as to be fitted around the first body 100. The second body 300 includes a second base 400 provided with a plurality of second through holes 410 that are in communication with each other, and a second active material. The plurality of second through holes 410 can be uniformly or non-uniformly distributed. The second active material is disposed in the second through holes 410. Specifically, after the second base 400 is provided with the plurality of second through holes 410, the second active material can be accommodated in the second through holes 410. The second active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as positive active materials for batteries can also be used. These positive active materials can be used alone or in combination with two or more kinds. Among them, examples of the lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (also referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxides can include, but are not limited to, at least one of lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (e.g., LiNi0.85Co0.15Al0.05O2)), and modified compounds thereof. The second active material can also include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. That is, depending on the second active material, the second body 300 can function as a positive electrode or a negative electrode of the battery cell 10 when the second active material is disposed in the second through holes 410.

[0074] Specifically, the first body 100 includes a first base body 200 and a first active material, after the first active material is arranged in the plurality of first through holes 210, the first body 100 can act as a positive electrode or a negative electrode of the battery cell 10, the second body 300 includes a second base body 400 and a second active material, after the second active material is arranged in the plurality of second through holes 410, the second body 300 can act as a positive electrode or a negative electrode of the battery cell 10, wherein the second body 300 is provided with a mounting hole 500, the first body 100 can be arranged in the mounting hole 500, that is, when the battery cell 10 is manufactured, the first body 100 can be placed in the mounting hole 500 of the second body 300, so as to complete the assembly of the battery cell 10, which can effectively improve the manufacturing efficiency of the battery cell 10. Specifically, the battery cell 10 can have high manufacturing efficiency.

[0075] Further, in some embodiments, the material of the first base body 200 and the second base body 400 is a foam metal. Specifically, the foam metal is a two-phase composite material composed of a metal base skeleton continuous phase and a pore dispersed phase or continuous phase. That is, when the first base body 200 is a foam metal, the first base body 200 has a plurality of first through holes 210. When the second base body 400 is a foam metal, the second base body 400 has a plurality of second through holes 410. The foam metal can include foam aluminum, foam nickel and its alloy, and foam copper. The manufacturing process of the foam metal can be to perform conductive treatment and then electroplate the target metal after taking organic cotton as the skeleton, and finally remove the organic skeleton and the conductive layer in a reducing atmosphere to generate a porous foam metal. Further, after the foam metal is manufactured, the positive and negative electrode slurries are respectively filled into the pores by filling (the preparation of the positive and negative electrode slurries is generally a wet process, and the slurry is generally prepared by stirring active material 98%, conductive agent 0.5%, binder 0.5% and solvent; dry electrode process can also be used). Then the positive tab is welded, it can be understood that the positive tab can be welded on the first body 100, wherein the second body 300 can be divided into two parts (after the two parts are welded, a cylindrical body is formed), or the second body 300 can be a one-piece cylindrical structure. After welding the positive tab, the separator is covered on the surface of the inner ring first body 100, and finally the two second bodies 300 in open loop form are respectively covered on the surface of the first body 100 and welded, and then the negative tab is welded, the tab adhesive 800 is attached, and thus the manufacturing of the battery cell 10 can be completed.

[0076] Further, in some embodiments, the first active material is a positive electrode material, the second active material is a negative electrode material, and the volume of the first substrate 200 is less than the volume of the second substrate 400. Specifically, it is conceivable that when the volume of the first substrate 200 is greater than the volume of the second substrate 400, the amount of the positive electrode material accommodated in the first substrate 200 will be more than the amount of the negative electrode material accommodated in the second substrate 400, which can cause the lithium precipitation of the battery cell 10. Therefore, the volume of the first substrate 200 is less than the volume of the second substrate 400, which can effectively avoid the lithium precipitation of the battery cell 10.

[0077] Further, in some embodiments, the porosities of the first substrate 200 and the second substrate 400 are K, and K≥90%. K can be 90%, 95%, or 96%. The porosity refers to the percentage of the pore volume in the bulk material to the total volume of the material in the natural state. That is, the greater the porosity of the first substrate 200 and the second substrate 400, the more the first active material that the first substrate 200 can accommodate, and the more the second active material that the second substrate 400 can accommodate. When the porosities of the first substrate 200 and the second substrate 400 are less than 90%, this will result in that the first substrate 200 accommodates less first active material, the second substrate 400 accommodates less second active material, and the energy density of the battery cell 10 is lower. The pore diameters of the first through hole 210 and the second through hole 410 can be greater than the pore diameters of the active material particles.

[0078] Further, please refer to Figure 3 In some embodiments, the battery cell 10 further includes a first tab 600, the first substrate 200 is provided with a third through hole 220, and the first tab 600 is welded to the hole wall of the third through hole 220. The first tab 600 can function to conduct the current of the first body 100 to the outside. The shape of the first substrate 200 can be a cylinder, and after the first substrate 200 is provided with the third through hole 220, the first tab 600 can be welded to the hole wall of the third through hole 220. Specifically, the outer circumferential surface of the first substrate 200 can be surrounded by the second substrate 400, and the third through hole 220 can be arranged at the middle position of the first substrate 200, which can effectively avoid the contact between the first tab 600 and the second substrate 400, and improve the safety of the battery cell 10.

[0079] Further, please refer to Figure 4 In some embodiments, the battery cell 10 further includes a second tab 700, and the second tab 700 is welded to the second substrate 400. The second tab 700 can function to conduct the current of the second body 300 to the outside. The shape of the second substrate 400 can be a cylinder, and after the second tab 700 is welded to the second substrate 400, the first tab 600 and the second tab 700 can form the positive electrode and the negative electrode of the battery cell 10, respectively.

[0080] Further, referring to Figure 4 , the following describes where the second tab 700 is specifically welded to the second base body 400. Specifically, in some embodiments, the second tab 700 is welded to the outer circumferential surface of the second base body 400. It is conceivable that after the second base body 400 is provided with the mounting hole 500, the mounting hole 500 can be a through hole, at this time, the second base body 400 is similar to a hollow cylinder, the second tab 700 is welded to the outer circumferential surface of the second base body 400, and the first base body 200 is arranged in the mounting hole 500, which can effectively avoid the second tab 700 and the first base body 200 from contacting, resulting in lower safety of the battery cell 10.

[0081] Further, referring to Figure 2 and Figure 4 , in some embodiments, the battery cell 10 further comprises a tab rubber 800, which is sleeved on the outer circumferential surface of the second base body 300 to cover the second tab 700 and the second base body 400. Specifically, after the tab rubber 800 is sleeved on the outer circumferential surface of the second base body 300, the tab rubber 800 can cover the welding burrs generated after the welding between the second tab 700 and the second base body 400, thereby effectively avoiding the welding burrs from reducing the safety of the battery cell 10.

[0082] Further, in some embodiments, the battery cell 10 further comprises a diaphragm, two sides of the diaphragm are connected to the first base body 100 and the second base body 300, respectively. Specifically, the above-mentioned second base body 400 is provided with the mounting hole 500, and the first base body 200 is arranged in the mounting hole 500. In order to effectively avoid the first base body 200 and the second base body 400 from short-circuiting, the diaphragm can be arranged in the mounting hole 500, so that the two sides of the diaphragm are connected to the first base body 100 and the second base body 300, respectively. The shape of the diaphragm can be a circular ring.

[0083] Further, in some embodiments, the pore size distribution of the first base body 200 and the second base body 400 is 100 μm-500 μm. The pore size distribution of the first base body 200 and the second base body 400 can be 100 μm, 200 μm, 300 μm, or 500 μm. When the pore size distribution of the first base body 200 and the second base body 400 is less than 100 μm, it will be inconvenient for the slurry to infiltrate. When the pore size distribution of the first base body 200 and the second base body 400 is greater than 500 μm, due to the excessively large pore size, it will result in excessively large surface density, causing local cracks during the drying process and reducing the rate performance of the battery cell.

[0084] In some embodiments, the battery comprises the battery cell 10 of any one of the above embodiments. Specifically, the first body 100 comprises the first substrate 200 and the first active material, after the first active material is arranged in the plurality of first through holes 210, the first body 100 can act as a positive electrode or a negative electrode of the battery cell 10, the second body 300 comprises the second substrate 400 and the second active material, after the second active material is arranged in the plurality of second through holes 410, the second body 300 can act as a positive electrode or a negative electrode of the battery cell 10, wherein the second body 300 is provided with the mounting hole 500, the first body 100 can be arranged in the mounting hole 500, that is, during the manufacturing of the battery cell 10, the first body 100 can be put into the mounting hole 500 of the second body 300, thereby completing the assembly of the battery cell 10, which can effectively improve the manufacturing efficiency of the battery cell 10. Specifically, the battery cell 10 can have a higher manufacturing efficiency. Further, the manufacturing efficiency of the battery with the battery cell 10 is also higher.

[0085] The embodiments of the utility model are explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, within the knowledge range possessed by the ordinary skilled in the art, various changes can be made without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. An electric cell, characterized by, The electric core comprises: a first body comprising a first base body and a first active material, the first base body being provided with a plurality of first through holes communicating with each other, and the first active material being arranged in the first through holes; a second body provided with a mounting hole, the first body being arranged in the mounting hole, the second body comprising a second base body and a second active material, the second base body being provided with a plurality of second through holes communicating with each other, and the second active material being arranged in the second through holes.

2. The electric cell of claim 1, wherein, The first base body and the second base body are both made of foamed metal.

3. The electric cell of claim 1, wherein, The first active material is a positive electrode material, the second active material is a negative electrode material, and the volume of the first base body is smaller than the volume of the second base body.

4. The electric cell of claim 1, wherein, The porosities of the first base body and the second base body are both K, and K is greater than or equal to 90%.

5. The electric cell of claim 1, wherein, The electric core further comprises a first tab, the first base body is provided with a third through hole, and the first tab is welded to the hole wall of the third through hole.

6. The electric cell of claim 1, wherein, The electric core further comprises a second tab, and the second tab is welded to the second base body.

7. The electric cell of claim 6, wherein, The second tab is welded to the outer peripheral surface of the second base body.

8. The electric cell of claim 7, wherein, The electric core further comprises a tab adhesive, and the tab adhesive is sleeved on the outer peripheral surface of the second body to cover the second tab and the second base body.

9. The electric cell of claim 1, wherein, The electric core further comprises a separator, and the separator is connected to the first body and the second body on both sides.

10. The electric cell of claim 1, wherein, The pore size distributions of the first base body and the second base body are both 100 μm to 500 μm.

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