CN215896448U - Lithium cell supplementing structure and lithium ion battery - Google Patents
Lithium cell supplementing structure and lithium ion battery Download PDFInfo
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- CN215896448U CN215896448U CN202122032558.6U CN202122032558U CN215896448U CN 215896448 U CN215896448 U CN 215896448U CN 202122032558 U CN202122032558 U CN 202122032558U CN 215896448 U CN215896448 U CN 215896448U
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery and a lithium ion battery, which comprise an electric core assembly and a metal lithium sheet for lithium supplement, wherein the electric core assembly comprises a first negative plate, a first isolating membrane, a positive plate, a second isolating membrane and a second negative plate which are sequentially stacked, one end of the metal lithium sheet is electrically connected with the first negative plate, and the other end of the metal lithium sheet is electrically connected with the second negative plate. The lithium supplement core structure can supplement lithium for the negative electrode, is simple in structure, good in safety and easy for large-scale mass production.
Description
Technical Field
The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a lithium supplement cell structure and a lithium ion battery.
Background
In the process of first charging of the lithium ion battery, irreversible losses of different degrees of capacity occur due to irreversible reactions of the positive electrode and the negative electrode, and the first irreversible loss of the negative electrode is usually greater than that of the positive electrode. The first efficiency of the common graphite cathode material is 93 percent, and the capacity loss of the whole battery is up to 7 percent due to irreversible reaction; the first efficiency of other cathodes with higher energy density, such as silicon-based and tin-based alloy cathode materials, is lower (generally less than 80%), which causes the application of the cathodes to be greatly limited, and the common solution is to supplement lost lithium to the cathodes and effectively improve the energy density of the lithium ion battery by improving the first charge-discharge efficiency of the cathodes.
The common method for lithium supplement of the negative electrode is lithium powder, compound lithium source or lithium recombination. The lithium powder is used for supplementing lithium, namely the treated lithium powder is uniformly covered on the surface of a negative pole piece, and lithium is activated to participate in charge-discharge reaction in the charge-discharge process to achieve the purpose of supplementing lithium, but the lithium powder has extremely high activity, is easy to generate dangers such as spontaneous combustion explosion and the like, and needs extremely high environmental requirements, so that the practical application of the lithium powder is greatly limited; the compound lithium source is an inert lithium source formed by reacting lithium with other compounds, and is directly added into the negative pole piece in the processes of slurry mixing, coating and the like, but other substances are introduced simultaneously in the method, so that side reactions are caused, the lithium supplement degree is limited, and the actual application effect is poor; lithium compounding is to directly roll and compound lithium (usually lithium foil) and a negative pole piece, and the lithium is activated in the charging and discharging process, the principle is similar to that of lithium powder, but the lithium compounding is limited by the processing capacity of the lithium foil, so that the lithium foil with the thickness lower than 5um is difficult to achieve at present, the lithium foil occupies the thickness of a negative pole, the interface of the positive pole and the negative pole is deteriorated after the lithium participates in the reaction, and meanwhile, the operation can be performed only in a severe environment by using a rolling device.
Patent CN206401458U provides a coiled lithium ion battery composite electrical core, which comprises a pole core, wherein a positive plate, a diaphragm, a negative plate and a lithium foil are sequentially stacked and coiled together according to the sequence of "negative plate-lithium foil-diaphragm-positive plate-diaphragm"; the structure adopts a lithium compounding method, so that the interface of a positive electrode and a negative electrode becomes poor, the lithium supplementing effect of the central lithium sheet or the lithium rod is outward from the center, a larger lithium supplementing gradient is caused, and even excessive lithium supplementation at the central position causes lithium precipitation; in the lithium ion battery provided by patent CN209401658U, a lithium metal layer is directly arranged on a shell and an insulating layer, the shell is connected with an anode, and the structure places lithium metal at the bottom of a battery cell, so that the lithium metal participates in a reaction under a power-on condition to achieve the purpose of lithium supplement, but this is only effective for the battery cell structure of a metal shell, and a soft package battery cell cannot be realized; patent CN111081982A uses a diaphragm to isolate lithium metal from a pole piece group, and encapsulates the lithium metal in a specific space of a battery, so as to avoid large area contact between the lithium metal and an anode and a cathode, and reduce the safety risk of the battery, and then connects and conducts the lithium metal with the anode or the cathode.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: aiming at the defects of the prior art, the lithium supplement core structure is provided, lithium supplement to the negative electrode can be realized, the structure is simple, the safety is good, and mass and large-scale production is easy to realize.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a mend lithium cell structure, includes the electric core subassembly and is used for mending the lithium metal lithium piece, the electric core subassembly is including the first negative pole piece, first barrier film, positive plate, second barrier film and the second negative pole piece that stack gradually and place, the one end of metal lithium piece with first negative pole piece electricity is connected, the other end of metal lithium piece with second negative pole piece electricity is connected.
The lithium supplementing effect of the battery core is uniform and stable, the safety performance and consistency of the battery core are ensured, the existing lithium ion battery production process is not required to be changed, the method is simple, large-scale production is easy, the lithium supplementing speed can be adjusted by adjusting the standing temperature, lithium supplementing can be completed in the standing stage, the operation is easier, and the lithium supplementing core structure is suitable for winding or laminating the battery core of a soft package, a square shell or a steel shell; the energy density of the lithium battery cell structure is obviously improved relative to the energy density of other general structure battery cells, and the cycle life is greatly prolonged.
The negative plate comprises a negative current collector and a negative active material layer arranged on at least one surface of the negative current collector. The material of the negative electrode current collector includes, but is not limited to, copper foil, and the specific kind of the negative electrode active material layer is not particularly limited and may be selected as desired. The negative electrode active material layer comprises a negative electrode active material, a negative electrode binder and a negative electrode conductive agent, and the negative electrode active material comprises at least one of artificial graphite, natural graphite, single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon-based composite materials, silicon alloy and silicon-based composite materials.
In some embodiments, the negative active material layer includes a negative active material including one or more of artificial graphite, natural graphite, single-walled carbon nanotubes, multi-walled carbon nanotubes, mesophase micro carbon spheres (abbreviated as MCMB), hard carbon, soft carbon, silicon-carbon composites, Li-Sn alloys, Li-Sn-O alloys, Sn, SnO2, spinel-structured lithiated TiO2-Li4Ti5O12, Li-Al alloys.
In some embodiments, the negative electrode active material layer may include a negative electrode binder for improving binding of the negative electrode active material particles to each other and binding of the negative electrode active material to the current collector. Non-limiting examples of binders include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide containing polymers, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy, nylon, and the like.
In some embodiments, the negative electrode active material layer further includes a negative electrode conductive agent for imparting conductivity to the electrode. The negative electrode conductive agent may include any conductive material as long as it does not cause a chemical change. Non-limiting examples of the negative electrode conductive agent include carbon-based materials (e.g., natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, etc.), metal-based materials (e.g., metal powder, metal fiber, etc., such as copper, nickel, aluminum, silver, etc.), conductive polymers (e.g., polyphenylene derivatives), and mixtures thereof.
The positive plate comprises a positive current collector and a positive active material layer arranged on at least one surface of the positive current collector, the material of the positive current collector comprises but is not limited to an aluminum foil, and the specific type of the positive active material layer is not particularly limited and can be selected according to requirements. The positive electrode active material layer includes a positive electrode active material, a positive electrode binder, and a positive electrode conductive agent.
In some embodiments, the positive electrode active material layer includes a positive electrode active material including a compound that reversibly intercalates and deintercalates lithium ions. In some embodiments, the positive active material may include a composite oxide containing lithium and at least one element selected from cobalt, manganese, and nickel. In still other embodiments, the positive active material is selected from lithium cobaltate (LiCoO)2) Lithium nickel manganese cobalt ternary material and lithium manganate (LiMn)2O4) Lithium nickel manganese oxide (LiNi)0.5Mn1.5O4) Lithium iron phosphate (LiFePO)4) One or more of them.
In some embodiments, the positive electrode active material layer further comprises a positive electrode binder for improving the binding of the positive electrode active material particles to each other and also to the main body of the electrode sheet. Non-limiting examples of the positive electrode binder include polyvinyl alcohol, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymer, polyvinyl pyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene 1, 1-difluoroethylene, polyethylene, polypropylene, styrene-butadiene rubber, acrylated styrene-butadiene rubber, epoxy resin, nylon, and the like.
In some embodiments, the positive electrode active material layer further includes a positive electrode conductive agent, thereby imparting conductivity to the electrode. The positive electrode conductive agent may include any conductive material as long as it does not cause a chemical change. Non-limiting examples of the conductive material include carbon-based materials (e.g., natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, etc.), metal-based materials (e.g., metal powder, metal fiber, etc., including, for example, copper, nickel, aluminum, silver, etc.), conductive polymers (e.g., polyphenylene derivatives), and mixtures thereof.
In the battery according to the application, a separation film is arranged between the positive pole piece and the negative pole piece to prevent short circuit. The material and shape of the separator used in the battery of the present application are not particularly limited, and may be any of the techniques disclosed in the prior art.
In some embodiments of the battery according to the present application, the separator may include a substrate layer and a surface treatment layer. The substrate layer is a non-woven fabric, a film or a composite film with a porous structure, and the material of the substrate layer is at least one selected from polyethylene, polypropylene, polyethylene terephthalate and polyimide. Specifically, a polypropylene porous film, a polyethylene porous film, a polypropylene nonwoven fabric, a polyethylene nonwoven fabric, or a polypropylene-polyethylene-polypropylene porous composite film can be used. At least one surface of the substrate layer is provided with a surface treatment layer, and the surface treatment layer can be a polymer layer or an inorganic layer, or a layer formed by mixing a polymer and an inorganic substance. The inorganic layer comprises inorganic particles and a binder, wherein the inorganic particles are selected from one or more of aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, hafnium oxide, tin oxide, cerium dioxide, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide and barium sulfate. The binder is selected from one or a combination of more of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene and polyhexafluoropropylene. The polymer layer comprises a polymer, and the material of the polymer is selected from at least one of polyamide, polyacrylonitrile, acrylate polymer, polyacrylic acid, polyacrylate, polyvinylpyrrolidone, polyvinyl ether, polyvinylidene fluoride and poly (vinylidene fluoride-hexafluoropropylene).
The metal lithium sheet is at least one of pure metal lithium foil, lithium block, lithium sheet and lithium alloy. The lithium alloy may be a lithium magnesium alloy, a lithium copper alloy, a lithium iron alloy, an aluminum lithium alloy, or a lithium silver alloy. Preferably, the thickness of the metallic lithium is 1 μm to 50 μm. Specifically, the thickness of the lithium metal includes, but is not limited to, 1-5 μm, 5-10 μm, 10-15 μm, 15-20 μm, 20-25 μm, 25-30 μm, 30-35 μm, 35-40 μm, 40-45 μm, or 5-50 μm.
As an improvement of the lithium supplement cell structure of the present invention, one side of the first negative electrode plate, which is located on the lithium metal plate, is longer than the first isolation film and the positive electrode plate, and one side of the second negative electrode plate, which is located on the lithium metal plate, is longer than the second isolation film and the positive electrode plate. First negative pole piece, first barrier film, positive plate, when second barrier film and second negative pole piece range upon range of in proper order and place, first barrier film and positive plate are stretched out suddenly to one side that is close to the metal lithium piece with first negative pole piece, make one side that first negative pole piece is close to the metal lithium piece because stretch out and the part is unsettled, and simultaneously, stretch out second barrier film and positive plate suddenly to one side that is close to the metal lithium piece with the second negative pole piece, make one side that the second negative pole piece is close to the metal lithium piece leak because stretching out, be convenient for first negative pole piece and second negative pole piece and metal lithium piece direct contact and electricity are connected, thereby realize mending lithium to the negative pole.
As an improvement of the lithium supplement cell structure of the present invention, one side of the first isolation film on the metal lithium sheet is longer than the positive electrode sheet, and one side of the second isolation film on the metal lithium sheet is longer than the positive electrode sheet. The lengths of the first isolating membrane and the second isolating membrane are increased, so that the positive plate is effectively separated from the metal lithium plate, and the lithium supplement quality is improved.
As an improvement of the lithium supplement cell structure, a separation film is filled between the positive plate and the metal lithium plate. The separating membrane is used for coating one end of the positive plate close to the metal lithium plate, so that the positive plate is separated from the metal lithium plate, and the lithium supplement quality is improved. The separation membrane may be another separation membrane, and may also be the first separation membrane and/or the second separation membrane. The length of the positive plate after being filled with the separation film is the same as that of the first separation film and that of the second separation film.
As an improvement of the lithium ion supplement cell structure of the present invention, the separation film is a first separation film and/or a second separation film.
As an improvement of a lithium supplement cell structure of the present invention, the metallic lithium sheet is disposed on at least one of a top side, a bottom side, a left side, or a right side of the cell assembly. Can set up the position of metal lithium piece as the condition, when the metal lithium piece was provided with the multi-disc, the metal lithium piece can set up in the both sides of electric core subassembly, can set up about electric core subassembly symmetry.
As an improvement of the lithium supplement cell structure, the metal lithium sheet includes a first lithium sheet and a second lithium sheet, and the first lithium sheet and the second lithium sheet are respectively disposed on two sides of the cell assembly.
As an improvement of the lithium supplement cell structure, the thickness of the metal lithium sheet is 0.001-0.3 mm, and the area of the metal lithium sheet is 0.5-5 times of the area of the side end face of the cell component.
As an improvement of the lithium supplement cell structure, the width of the metal lithium sheet is 0.2-10 times of the thickness of the cell assembly, and the length of the metal lithium sheet is 0.2-1.5 times of the length of the cell assembly. Assuming that the width of the core assembly is T, it is preferable that the width of the lithium metal sheet is 0.2T to 10T or T +20 (the width of the lithium metal sheet is the smallest of the above).
Preferably, the lithium supplement cell structure further comprises a third isolating film, wherein the third isolating film is used for fixedly wrapping the lithium metal sheet and the cell assembly, and the third isolating film is arranged on the outermost layer of the cell assembly.
Preferably, the lithium supplement cell structure further comprises a fourth isolation film, and the fourth isolation film is the isolation film.
Another object of the present invention is to: aiming at the defects of the prior art, the lithium ion battery is provided, can supplement lithium for the cathode, has simple structure and good safety, and is easy for mass and large-scale production.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lithium ion battery comprises electrolyte and a shell, wherein the shell is used for installing the electrolyte and the lithium supplement cell structure.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model provides a lithium supplement core structure which can supplement lithium for a negative electrode, is simple in structure, good in safety and easy for large-scale mass production.
2. According to the lithium ion battery, after the electric core assembly is assembled, electrolyte is injected, then the lithium ion battery is placed statically, in the standing process, metal lithium is solvated and enters the negative electrode material through the self-discharge principle, the process is slow and stable, and the lithium ion battery can be adjusted by changing the temperature of the standing environment, so that the purpose of uniformly supplementing lithium is achieved.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 4 of the present invention.
Fig. 5 is a schematic structural diagram of embodiment 5 of the present invention.
Fig. 6 is a schematic view showing the effect of lithium supplement diffusion.
Fig. 7 is a schematic diagram of lithium supplement effect.
Wherein: 1. an electrical core assembly; 11. a first negative plate; 12. a first barrier film; 13. a positive plate; 14. a second barrier film; 15. a second negative plate; 2. a metallic lithium plate; 3. separating the membrane.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1, the lithium supplement cell structure of the present invention includes a cell assembly 1 and a metal lithium sheet 2 for supplementing lithium, where the cell assembly 1 includes a first negative electrode sheet 11, a first isolation film 12, a positive electrode sheet 13, a second isolation film 14, and a second negative electrode sheet 15, which are sequentially stacked, one end of the metal lithium sheet 2 is electrically connected to the first negative electrode sheet 11, and the other end of the metal lithium sheet 2 is electrically connected to the second negative electrode sheet 15. The first negative electrode plate 11 is longer than the first isolation film 12 and the positive electrode plate 13 on one side of the lithium metal plate 2, and the second negative electrode plate 15 is longer than the second isolation film 14 and the positive electrode plate 13 on one side of the lithium metal plate 2. The lithium metal sheet 2 is positioned on the right side of the cell component 1.
A lithium ion battery comprising the steps of:
1) preparing a positive plate 13;
preparation of positive electrode active material slurry: mixing lithium iron phosphate, a conductive agent SuperP and a binder polyvinylidene fluoride according to the weight ratio of 96.7, 1.7 and 1.6, adding N-methylpyrrolidone (NMP), and stirring under the action of a vacuum stirrer until the system is uniform to obtain anode active material slurry with the solid content of 59%.
Positive electrode sheet 13: taking a positive current collector, dividing the positive current collector into a pole piece main body area and a pole lug area, dividing the pole lug area into a connection area and a pole lug main body area, and connecting the pole lug main body area with the pole piece main body area through the connection area; coating the positive active material slurry on at least one surface of the pole piece main body area, and drying at 85 ℃ to obtain a positive active material layer; and (3) carrying out vacuum drying for 24 hours at the temperature of 60 ℃ in a drying environment to obtain the positive pole piece, wherein the surface density of the pole piece is 0.0182g/cm 2.
2) Preparing a negative plate;
preparation of negative active material slurry: mixing the negative active material artificial graphite, the conductive agent SuperP, the thickening agent carboxymethylcellulose sodium (CMC) and the binder Styrene Butadiene Rubber (SBR) according to the weight ratio of 95.7:1.7:1:1.6, adding deionized water, and obtaining negative active substance slurry with the solid content of 54% under the action of a vacuum stirrer.
Preparing a negative plate: taking a negative current collector, dividing the negative current collector into a pole piece main body area and a pole lug area, dividing the pole lug area into a connection area and a pole lug main body area, and connecting the pole lug main body area with the pole piece main body area through the connection area; coating the negative active material slurry on two surfaces of the pole piece main body area, and drying at 85 ℃ to obtain a negative active material layer; and (3) carrying out vacuum drying for 24 hours at the temperature of 60 ℃ in a drying environment to obtain the negative pole piece, wherein the area density of the negative pole piece is 0.0086g/cm 2.
3) Preparing a separation film;
a commercial polypropylene film with the thickness of 12 mu m is taken as a separation film and dried for 24 hours in vacuum at the temperature of 60 ℃ in a drying environment.
4) Placing 20um of lithium metal on one end face, the edge of which has no diaphragm and can be in electronic contact with the negative electrode, enabling the diaphragm to completely cover the positive electrode through an assembly process, and assembling the negative electrode in a mode that one edge of the negative electrode is not covered by the diaphragm, and the edge of the negative electrode has no diaphragm to obtain the lithium supplement cell structure;
5) and baking, injecting, standing and forming to obtain the lithium ion battery with the negative lithium supplement function.
Example 2
The difference from example 1 is that: as shown in fig. 2, the lithium metal sheet 2 includes a first lithium sheet and a second lithium sheet, and the first lithium sheet and the second lithium sheet are respectively disposed on two sides of the battery module 1.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 2 is that: as shown in fig. 3, the separation films 3 are respectively filled between the positive electrode sheet 13 and the lithium metal sheets 2 on both sides.
The rest is the same as embodiment 2, and the description is omitted here.
Example 4
The difference from embodiment 3 is that, as shown in fig. 4, a lithium metal sheet 2 is disposed on one side of the cell assembly 1, and a separation film 3 is filled between the positive electrode sheet 13 and the lithium metal sheet 2.
The rest is the same as embodiment 3, and the description is omitted here.
Example 5
The difference from example 4 is that, as shown in fig. 5, the positive electrode sheet 13 is provided with a separator 3 apart from one of the lithium metal sheets 2.
The rest is the same as embodiment 4, and the description is omitted here.
Comparative example 1
The utility model provides an electricity core structure, includes the first positive plate, first barrier film, negative pole, second barrier film, the second positive plate that stack gradually and place, one side of negative pole is stretched out suddenly in first barrier film and second barrier film, first barrier film is stretched out suddenly in first positive pole, the second barrier film is stretched out suddenly in the second positive plate.
The lithium ion battery obtained by any one of the embodiments has the advantages that after lithium is supplemented, the first charging specific capacity of the battery can reach 161.1mAh/g, the first discharging specific capacity can reach 147.7mAh/g, and the first coulombic efficiency of the full battery can reach 91.68%. After the material is cycled for 400 times at 45 ℃, the discharge specific capacity is 133.4mAh/g, and the capacity retention rate is 90.32%. The first charging specific capacity of the lithium battery which is not supplemented can reach 159.9mAh/g, the first discharging specific capacity can reach 139.8mAh/g, and the first coulombic efficiency of the full battery can reach 87.43%. After the material is cycled for 400 times at 45 ℃, the discharge specific capacity is 117.2mAh/g, and the capacity retention rate is 83.87%.
As can be seen from examples 1-5 and comparative example 1: the anode is completely covered or coated by the isolating film, at least one edge of the cathode is not covered by the isolating film, and the edge of the cathode is assembled without a diaphragm to obtain the cell assembly 1, then the metal lithium is placed on at least one end face of the cell assembly 1, which can be in electronic contact with the cathode in the cell assembly 1, so as to obtain the lithium supplement cell assembly 1, as shown in fig. 6 and 7, the metal lithium is quickly and uniformly dissolved and diffused and embedded into the cathode material by the self-discharge principle after the electrolyte is injected into the lithium supplement cell assembly 1, and the lithium supplement for the cathode of the cell can be realized in formation and standing. Compared with the lithium-not-supplemented core, the charge-discharge specific capacity, the first coulombic efficiency and the circulating capacity retention rate of the core after lithium supplementation are obviously improved.
While the foregoing description shows and describes several preferred embodiments of the utility model, it is to be understood, as noted above, that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. The utility model provides a mend lithium cell structure, its characterized in that includes the electric core subassembly and is used for mending the lithium metal lithium piece, the electric core subassembly is including range upon range of first negative pole piece, first barrier film, positive plate, second barrier film and the second negative pole piece of placing in proper order, the one end of metal lithium piece with first negative pole piece electricity is connected, the other end of metal lithium piece with second negative pole piece electricity is connected.
2. The lithium ion battery cell structure of claim 1, wherein the first negative electrode tab is longer than the first separator and the positive electrode tab on a side of the lithium metal tab, and the second negative electrode tab is longer than the second separator and the positive electrode tab on a side of the lithium metal tab.
3. The lithium supplement cell structure according to claim 1 or 2, wherein the first separator is longer than the positive electrode sheet on one side of the lithium metal sheet, and the second separator is longer than the positive electrode sheet on one side of the lithium metal sheet.
4. The lithium supplement cell structure according to claim 1 or 2, wherein a separation film is filled between the positive electrode sheet and the lithium metal sheet.
5. The lithium supplement cell structure according to claim 4, wherein the separation film is a first separation film and/or a second separation film.
6. The lithium rechargeable battery cell structure of claim 1, wherein the metallic lithium sheet is disposed on at least one of a top side, a bottom side, a left side, or a right side of the battery cell assembly.
7. The lithium supplement cell structure of claim 6, wherein the metallic lithium sheet comprises a first lithium sheet and a second lithium sheet, and the first lithium sheet and the second lithium sheet are respectively disposed on two sides of the cell assembly.
8. The lithium supplement battery cell structure according to claim 1, wherein the thickness of the lithium metal sheet is 0.001-0.3 mm, and the area of the lithium metal sheet is 0.5-5 times of the area of the side end face of the battery cell assembly.
9. The lithium supplement cell structure according to claim 8, wherein the width of the lithium metal sheet is 0.2 to 10 times the thickness of the cell assembly, and the length of the lithium metal sheet is 0.2 to 1.5 times the length of the cell assembly.
10. A lithium ion battery comprising an electrolyte and a casing for housing the electrolyte and the lithium supplement cell structure of any of claims 1-9.
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| CN202122032558.6U CN215896448U (en) | 2021-08-26 | 2021-08-26 | Lithium cell supplementing structure and lithium ion battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114784362A (en) * | 2022-03-02 | 2022-07-22 | 江苏正力新能电池技术有限公司 | Battery cell structure, secondary battery, battery pack and power utilization device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114784362A (en) * | 2022-03-02 | 2022-07-22 | 江苏正力新能电池技术有限公司 | Battery cell structure, secondary battery, battery pack and power utilization device |
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