CN115832580A - Battery cell, battery and power consumption device - Google Patents
Battery cell, battery and power consumption device Download PDFInfo
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- CN115832580A CN115832580A CN202211483203.1A CN202211483203A CN115832580A CN 115832580 A CN115832580 A CN 115832580A CN 202211483203 A CN202211483203 A CN 202211483203A CN 115832580 A CN115832580 A CN 115832580A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application discloses battery monomer, battery and power consumption device, battery monomer include shell and gaseous adsorption structure, the shell has the holding chamber, and gaseous adsorption structure locates the holding intracavity, and gaseous adsorption structure's material includes at least one or nanometer molecular sieve in hierarchical pore molecular sieve and the compound molecular sieve, and wherein, compound molecular sieve is formed by microporous molecular sieve and the mixture of mesoporous molecular sieve. No matter the gas adsorption structure adopts a nano molecular sieve, a hierarchical pore molecular sieve or a composite molecular sieve, compared with a micron-sized or submicron-sized microporous molecular sieve as a gas absorbent, the gas adsorption structure in the gas adsorption structure has higher external specific surface area and larger adsorption capacity, the gas adsorption capacity is increased, the potential safety hazard caused by gas production of a battery monomer is relieved to a great extent, the diffusion of gas and micro bubbles generated in the formation process of the battery monomer is accelerated, the gas adsorption efficiency is improved, the quality of an SEI film of the battery monomer is improved, and the production efficiency of the battery monomer is improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device.
Background
In recent years, new energy automobiles are developed vigorously due to the characteristics of energy conservation and environmental protection, a battery driving system is a main factor influencing the performance and the cost of the new energy automobiles, and a power lithium ion battery is an important component of the battery driving system. Generally, a lithium ion battery includes a positive electrode assembly, a negative electrode assembly, and an electrolyte sealed within a battery case.
The nonaqueous solvent in the electrolyte is easily decomposed in a working environment, and a gas is generated in the battery cell, and the generated gas contains CO 2 、CO、CH 4 、C 2 H 4 、C 2 H 6 、H 2 And O 2 And the like. If the gas is generated too much, the battery monomer will swell, which will cause the impedance of the battery to increase and the service life to shorten. To solve this problem, existing batteries currently employ microporous molecular sieves as gas absorbents to trap the gas. However, the microporous molecular sieve has a low gas adsorption amount and low effective utilization efficiency.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a battery cell, a battery and an electric device to solve the technical problems of low effective utilization rate and low gas adsorption amount of a microporous molecular sieve used as a gas absorbent.
In a first aspect, an embodiment of the present application provides a battery cell, a housing and a gas adsorption structure, the housing has an accommodation cavity, the gas adsorption structure is located in the accommodation cavity, the material of the gas adsorption structure includes at least one of a hierarchical pore molecular sieve and a composite molecular sieve or a nano molecular sieve, wherein the composite molecular sieve is formed by mixing a microporous molecular sieve and a mesoporous molecular sieve.
The nanometer molecular sieve has larger adsorption capacity due to smaller particle size, larger external specific surface area and more effective adsorption active centers, so that the gas adsorption capacity can be greatly increased by using the nanometer molecular sieve to prepare a gas adsorption structure. The hierarchical pore molecular sieve has two sets of pore channel structures, has the characteristics of high external specific surface area, large adsorption capacity and the like, and simultaneously, the microporous pore channels and the mesoporous pore channels of the hierarchical pore molecular sieve are uniformly distributed, so that adsorption active sites distributed on micropores can have contactability to the maximum extent, the diffusion efficiency of gas is improved, the problem of mass transfer diffusion limitation is solved to a greater extent, the utilization rate of the microporous pore channels in the hierarchical pore molecular sieve is improved, and the gas adsorption capacity is increased. The composite molecular sieve is a mixture of a microporous molecular sieve and a mesoporous molecular sieve, and the mesoporous molecular sieve with larger aperture is mixed, and simultaneously participates in the gas adsorption process, so that the external specific surface area is higher, the adsorption capacity is larger, the problem of mass transfer diffusion limitation can be solved to a certain extent, the gas adsorption capacity is increased, and no matter the gas adsorption structure adopts a nano molecular sieve, a multistage molecular sieve or a composite molecular sieve, the diffusion of gas dissolved in electrolyte and micro bubbles adhered to a pole piece and a diaphragm generated in the formation process of a battery monomer can be accelerated, so that the gas adsorption efficiency is improved, the quality of the battery monomer SEI film and the production efficiency of the battery monomer SEI film are improved, and the potential safety hazard caused by gas production is relieved to a great extent.
In some embodiments, the gas adsorbing structure comprises a plurality of gas adsorbing particles, each of which is made of one or more of the nano molecular sieve, the multi-stage molecular sieve, and the composite molecular sieve. The gas adsorption particles are convenient to quickly fill the residual space in the battery monomer, and the operability is high.
In some embodiments, the outer shell includes a shell body and a top cover, the shell body forms a containing groove, the top cover covers a notch of the containing groove, the battery cell further includes a bare cell disposed in the containing cavity, the containing cavity includes a first cavity portion for containing the bare cell and a second cavity portion disposed in the top cover, the second cavity portion is communicated with the first cavity portion, and the gas adsorption structure is filled in the second cavity portion. Therefore, the gas adsorption structure can be filled in the top cover, other spaces in the accommodating cavity are not occupied, operation is convenient, and processing cost is saved.
In some embodiments, an installation gap is formed between a groove wall of the accommodating groove and an outer side surface of the bare cell, and the gas adsorption structure is filled in the installation gap. Therefore, the residual space in the accommodating cavity can be repeatedly utilized by the gas adsorption structure to absorb gas, and a filling space does not need to be separately arranged in the battery monomer.
In some embodiments, the battery cell further includes a bare cell disposed in the accommodating cavity, the bare cell is cylindrical and is formed with a central hole extending along an axial direction, and the gas adsorption structure is filled in the central hole. The original center hole design of the cylindrical battery cell is reserved, the original production processes of the battery monomer are not influenced, meanwhile, the residual space of the cylindrical battery cell is used to the utmost extent flexibly, the current situation that the explosion-proof measure for gas production of the cylindrical battery cell catches the elbow is relieved and even solved, the product design of the iterative cylindrical battery cell is upgraded, and the product competitiveness is improved.
In some embodiments, the housing further includes a casing, a top cover, and a bottom cover, where the casing is annular, the top cover and the bottom cover respectively cover openings at two ends of the casing, and form the accommodating cavity together with the casing, the battery cell further includes a bare cell disposed in the accommodating cavity, the accommodating cavity includes a first cavity portion accommodating the bare cell and a third cavity portion disposed on the bottom cover, the third cavity portion is communicated with the first cavity portion, and the gas adsorption structure is filled in the third cavity portion. Therefore, the gas adsorption structure can be filled in the bottom cover, other spaces in the accommodating cavity are not occupied, operation is convenient, and processing cost is saved.
In some embodiments, an avoiding groove is formed in one side, facing the first cavity, of the bottom cover, the inner wall of the avoiding groove is surrounded to form the third cavity, and the gas adsorption structure is filled in the avoiding groove, so that the existing space on the bottom cover is fully utilized, and the processing and the operation are convenient.
In some embodiments, the battery cell further comprises a bare battery cell arranged in the accommodating cavity, the gas adsorption structure comprises a gas adsorption coating, and the gas adsorption coating is coated on the cavity wall of the accommodating cavity or the outer surface of the bare battery cell. The coating can be in direct contact with the electrolyte to remove gases and moisture from the electrolyte.
Illustratively, the housing comprises a housing and a top cover, the housing forms a containing groove, the top cover covers the notch of the containing groove, the housing comprises an annular side shell and a bottom shell connected to the end part of the side shell, the side shell and the bottom shell together form the containing groove, and the gas adsorption coating is coated on one side of the side shell facing the containing groove. Like this, alright save the space between naked electric core and the casing, can directly contact with electrolyte simultaneously to get rid of gas and moisture in the electrolyte
In a second aspect, the present application further provides a battery, which includes the single battery in the above embodiment. The battery reduces the impedance of the battery, prolongs the service life and reduces the potential safety hazard caused by gas production by arranging the battery monomer.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout. In the drawings:
FIG. 1 is a schematic illustration of a spherical molecular sieve;
FIG. 2 is a schematic view of a molecular sieve strip;
fig. 3 is a diagram illustrating a guarantee of a battery cell according to an embodiment of the present disclosure;
fig. 4 is a structural view of a top cover of a battery cell according to an embodiment of the present disclosure;
fig. 5 is an exploded view of a battery cell in example three of the present application.
The reference numbers in the detailed description are as follows:
100. 200, a single battery; 10. a top cover; 11. a boss; 110. a first mounting hole; 12. an explosion-proof valve screen; 120. a second mounting hole; 20. a naked battery cell; 201. a central bore; 30. a housing; 31. a side casing; 311. a first side portion; 312. a second side portion; 32. a bottom case; 301. a first mounting gap; 302. a second mounting gap; 311. a containing groove; 40. an insulating sheet; 50. a bottom pallet; 70. a bottom cover; 701. an avoidance groove; 7011. a first groove portion; 7012. a second groove portion.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and therefore are only used as examples, and the protection scope of the present application is not limited thereby.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In the description of the embodiments of the present application, the SEI film refers to a solid electrolyte interface film having characteristics of a solid electrolyte, that is, a passivation layer formed by a layer covering the surface of an electrode material formed by a reaction between the electrode material and an electrolyte solution at a solid-liquid interface during the first charge and discharge of a liquid lithium ion battery.
In recent years, new energy automobiles are developed vigorously due to the characteristics of energy conservation and environmental protection, a battery driving system is a main factor influencing the performance and the cost of the new energy automobiles, and a power lithium ion battery is an important component of the battery driving system. Generally, a lithium ion battery includes a positive electrode assembly, a negative electrode assembly, and an electrolyte sealed within a battery case. The lithium ion battery can provide more energy in a limited space and overcome mileage anxiety, but the nonaqueous solvent in the electrolyte of the lithium ion battery is easy to decompose under a working environment, gas is generated in the battery, and the generated gas contains CO 2 、CO、CH 4 、C 2 H 4 、C 2 H 6 、H 2 And O 2 And the like. If the gas is generated too much, the battery monomer will swell, which will cause the impedance of the battery to increase and the service life to shorten.
In order to solve the problem, the existing lithium ion battery adopts micron-sized or submicron-sized microporous molecular sieve as a gas absorbent for gas trapping. For example, microporous molecular sieves encapsulated in a gas permeable film and placed in the peak space within the core react in conjunction with copper ions supported on their matrix to consume CO while trapping CO 2 Or the microporous molecular sieve is used as one of the main carriers of the adsorption component and is packaged in the single battery shell together with other components to adsorb CO and CO 2 Meanwhile, the adsorption of moisture can be realized, or the monomer battery core is divided into certain basic units, and a heat insulation layer containing microporous molecular sieve is inserted into the basic units to adsorb O 2 。
The microporous molecular sieve has abundant pore structures (as shown in figure 1), and the method can utilize the characteristics of the microporous molecular sieve to adsorb and seal the gas in the battery monomer, thereby reducing the gas pressure in the battery cell and reducing the swelling of the battery cellThe increase of the interface impedance is limited, thereby prolonging the service life of the battery cell and adsorbing CO and CO simultaneously 2 The moisture generated in the process of (2) is adsorbed, so that the moisture is prevented from generating negative influence on the performance of the battery monomer.
However, the pore diameters of the micropores of the microporous molecular sieve are all smaller than 2nm, which easily causes that gas generated in the working process of the battery core is preferentially adsorbed by the surface of the molecular sieve, causes the blockage of the pore passage on the surface of the molecular sieve, the adsorption is quickly saturated, and the pore structure in the microporous molecular sieve cannot be effectively utilized; in addition, although the solvent molecules in the electrolyte will prevent the electrolyte (especially the solvent with large molecular chains) from permeating into the pores of the microporous molecular sieve, the gas small molecules are prevented from being adsorbed by the microporous molecular sieve by the large molecules, and the gas adsorption amount and the effective utilization efficiency of the microporous molecular sieve are low due to the reasons.
Based on the defects of the existing research, the inventor provides the battery cell, the battery and the electric device in the following embodiments to improve the gas adsorption amount and the effective utilization efficiency of a gas adsorption structure, remove gas dissolved in an electrolyte generated in the formation process of the battery cell and remove micro bubbles adhered to a pole piece and a diaphragm, improve the quality of an SEI film of the lithium ion battery and improve the production efficiency of the lithium ion battery.
The embodiment of the application provides a battery monomer, a battery and an electric device.
The battery cell is the smallest unit constituting the battery, wherein the battery cell may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell may be flat, rectangular, or other shape.
The battery comprises at least one battery cell, and generally comprises a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in series-parallel to increase the power supply capacity of the battery. In some cases, the battery further includes a case in which the battery cells are accommodated.
The electric device is an electric device using a battery as a power supply, and the electric device comprises but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like.
The battery monomer comprises a shell and gas adsorption particles, wherein the shell is provided with an accommodating cavity, electrolyte is filled in the accommodating cavity, a gas adsorption structure is arranged in the accommodating cavity, the material of the gas adsorption structure comprises at least one of a hierarchical pore molecular sieve and a composite molecular sieve or a nano molecular sieve, and the composite molecular sieve is formed by mixing a microporous molecular sieve and a mesoporous molecular sieve.
The molecular sieve can be divided into a nano molecular sieve (the particle size is less than 100 nm), a submicron molecular sieve (the particle size is between 100nm and 1 mu m) and a micron molecular sieve (the particle size is not less than 1 mu m), wherein the nano molecular sieve has larger adsorption capacity due to smaller particle size, larger external specific surface area and more effective adsorption active centers, so that the gas adsorption structure prepared by using the nano molecular sieve can greatly increase the gas adsorption capacity, prolong the service life of a battery monomer and greatly relieve the potential safety hazard brought by gas production of the battery monomer. The nano molecular sieve can be obtained by accurately regulating and controlling the particle size of the molecular sieve at a nano level.
The molecular sieve is classified into a single pore molecular sieve and a multi-level pore molecular sieve according to whether the pore diameter is single, wherein the single pore molecular sieve is a molecular sieve having a pore diameter with a single pore diameter, and the single pore molecular sieve can be classified into a microporous molecular sieve (the pore diameter is less than 2 nm), a mesoporous molecular sieve (the pore diameter is 2-50 nm), and a macroporous molecular sieve (the pore diameter is more than 50 nm) according to the difference of the pore diameter, and the multi-level pore molecular sieve is a molecular sieve having at least two pore diameters with different pore diameters.
The currently selected microporous molecular sieve has a single microporous channel, and the adsorption of gas is limited because the non-contact of an adsorption active center is easily caused by particle agglomeration or diffusion limitation. Instead of a single pore molecular sieve, the present embodiment may employ a hierarchical pore molecular sieve. The hierarchical pore molecular sieve can be directly prepared, and has two sets of pore channel structures, namely a micropore channel and a mesopore channel, the hierarchical pore molecular sieve has the characteristics of high external specific surface area, large adsorption capacity and the like, meanwhile, the micropore channel and the mesopore channel of the hierarchical pore molecular sieve are uniformly distributed, the micropore channel is embedded between the mesopore channels, gas can enter the micropore channel through the mesopore channel, and the adsorption active sites distributed on micropores can be enabled to have accessibility by the hierarchical pore molecular sieve to the maximum extent, so that the diffusion efficiency of the gas is improved, the problem of mass transfer diffusion limitation is solved to a greater extent, the utilization rate of the micropore channel is improved, the gas adsorption capacity is increased, and potential safety hazards caused by gas production of a battery monomer are relieved to a great extent. In addition, mesopores in the hierarchical pore molecular sieve can provide passable pore channels for the electrolyte additive, especially for solvent molecules with large molecular chains, the solvent molecules can flow through the mesopore pore channels, the solvent molecules are prevented from blocking micropore pore channels in the molecular sieve or being adsorbed by the molecular sieve to influence the formation of an SEI film, and the loss of the additive is reduced.
The composite molecular sieve is a material mixture of a microporous molecular sieve and a mesoporous molecular sieve. The microporous molecular sieve and the mesoporous molecular sieve are prepared separately, and then the microporous molecular sieve and the mesoporous molecular sieve are mixed according to a certain proportion to form the composite molecular sieve, so that the composite molecular sieve has two sets of pore channel structures, namely a microporous pore channel of the microporous molecular sieve and a mesoporous pore channel of the mesoporous molecular sieve, compared with the case of using the microporous molecular sieve separately, the composite molecular sieve has the advantages that the mesoporous molecular sieve with larger pore diameter is mixed, the mesoporous molecular sieve participates in a gas adsorption process, the external specific surface area is higher, the adsorption capacity is larger, the mass transfer diffusion limitation problem can be solved to a certain extent, the gas adsorption quantity is increased, the air suction time is shortened, a series of consequences caused by gas production of a battery monomer are relieved to a great extent, and the potential safety hazard caused by CID (Current Interrupt device) overturning is overcome.
When the material of the gas adsorption structure contains the composite molecular sieve, the mass ratio of the microporous molecular sieve to the mesoporous molecular sieve contained in the composite molecular sieve is 10-90:90-10, further 40-60:60-40. The mixing ratio of the microporous molecular sieve and the mesoporous molecular sieve is controlled to improve the function of the composite molecular sieve.
And secondly, no matter the gas adsorption structure adopts a nano molecular sieve, a hierarchical pore molecular sieve or a composite molecular sieve, the diffusion of gas dissolved in the electrolyte and micro bubbles adhered to a pole piece and a diaphragm generated in the formation process of the single battery can be accelerated, so that the gas adsorption efficiency is improved, the quality of the SEI film of the single battery is improved, and the production efficiency of the single battery is improved.
This battery monomer can select to be lithium ion battery monomer, and the naked electric core in the battery monomer can be for crust electric core, laminate polymer electric core or drum electric core, does not do the restriction here. The shell can be an aluminum plastic film shell. The top cover can be made of metal or plastic materials.
Wherein, the hierarchical pore molecular sieve and the composite molecular sieve can be in the nanometer level or the micron or submicron level, and are not limited in the specification. In this embodiment, the microporous molecular sieve, the mesoporous molecular sieve, and the hierarchical molecular sieve may all be selected from nano molecular sieves, so that the microporous molecular sieve, the mesoporous molecular sieve, and the hierarchical molecular sieve can obtain a higher external specific surface area and more effective adsorption active centers due to the increase of particle size on the basis of their own pore diameter advantages, thereby further increasing the gas adsorption capacity.
In some embodiments, the nanomolecular sieve comprises one or more of a-type molecular sieve, X-type molecular sieve, Y-type molecular sieve, T-type molecular sieve, ZSM series molecular sieves, CHA molecular sieve, beta molecular sieve, and aluminum phosphate molecular sieve.
Specifically, the nano molecular sieve, the hierarchical molecular sieve and the microporous molecular sieve are one or more of a 5A molecular sieve, a 13X molecular sieve, a Y molecular sieve, a ZSM-5 molecular sieve, a ZSM-11 molecular sieve, a Beta molecular sieve and a SAPO-34 molecular sieve. The mesoporous molecular sieve is one or more of an MCM-41 molecular sieve, an MCM-22 molecular sieve and an SBA-15 molecular sieve.
The gas adsorption structure may have various external forms, such as powder or granule. In practical application, the gas adsorption structure with a proper appearance can be selected according to the requirement of the internal space of the battery cell.
Wherein, powdered gas adsorption structure does not have fixed form, easily fills to any narrow and small space in the battery monomer to the shape according to the filling space is stereotyped.
The granular gas adsorption structure is convenient to take and place, and can be limited in the inner space of the battery monomer through the specific shape of the granular gas adsorption structure. Specifically, the gas adsorption structure comprises a plurality of gas adsorption particles, and the material of each gas adsorption particle comprises at least one of a hierarchical pore molecular sieve and a composite molecular sieve or a nano molecular sieve. A plurality of gas adsorption particles in the gas adsorption structure can be gas adsorption particles of the same component, and also can be gas adsorption particles of different components, and the gas adsorption particles are not limited in the position and can be specifically prepared and selected according to requirements. The gas adsorbing particles may be spherical (see fig. 1) or columnar (see fig. 2), and the columnar shape may be cylindrical, prismatic, or the like.
Wherein, granular and powdered gas adsorption structure accessible waterproof ventilative diaphragm encapsulates, puts into the holding chamber again and carries out gaseous absorption.
Specifically, the battery monomer includes shell, naked electric core and gaseous adsorption structure, and the shell forms the holding chamber, and the holding intracavity is filled with electrolyte, and naked electric core is located the holding intracavity to soak in electrolyte. This naked electric core can roll up core, cylinder electric core or soft-packaged electric core for the slice, and the specific restriction is not done here.
In some embodiments, the bare cell is a sheet-shaped winding core, the outer shell at least includes a shell and a top cover, the shell is formed with an accommodating groove, the top cover covers the groove opening of the accommodating groove and encloses with the shell to form a sealed accommodating cavity, and the shell can be in various shapes and various sizes, such as a rectangular parallelepiped shape, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the housing may be determined according to the specific shape and size of the electric core assembly. The housing may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The top cover can be made of materials with certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic and the like).
To the battery monomer of general cuboid shape, the cross-section of the inner wall of its casing is the square, and the cross-section of storage tank is the square promptly, and when naked electric core rolled up the core for the slice, unable complete adaptation between the cell wall of storage tank and the surface of naked electric core can form installation clearance, and gaseous adsorption structure can fill in installation clearance. Because this installation clearance is irregular space, for filling more gas adsorption structure, this installation clearance's gas adsorption structure is powdered. When the gas adsorption structure is used, the powdery gas adsorption structure can be extruded and molded into a specific shape matched with the installation gap, and then the gas adsorption structure with the specific shape is inserted into the installation gap, so that the gas adsorption structure can be rapidly filled.
Exemplarily, the holding chamber is including the first chamber portion that is used for the naked electric core of holding and locate the second chamber portion in the top cap, and second chamber portion is linked together with first chamber portion, and gas adsorption structure fills in second chamber portion. That is, the second chamber section is formed on the top cover, and the gas adsorbing structure is fixed in position by the top cover, in which case the gas adsorbing structure may be in a powder form, or may include a plurality of gas adsorbing particles. Wherein, gas adsorption structure encapsulates in second chamber portion through waterproof ventilated membrane to in earlier fix a position gas adsorption structure on the top cap before adding the lid, prevent that gas adsorption granule from dropping in the second chamber portion, can avoid the gas adsorption that solvent molecule in the electrolyte influences gas adsorption structure simultaneously.
Alternatively, the second chamber portion may be communicated with the first chamber portion through a mounting hole, and an aperture of the mounting hole may be set to be small, so that part of the gas adsorption particles may be directly clamped at the aperture of the mounting hole, thereby preventing the gas adsorption particles or the powdered gas adsorption structure in the second chamber portion from falling. When the waterproof breathable film is required to be packaged, the waterproof breathable film can be directly covered at the hole of the mounting hole.
In some embodiments, the bare cell is a cylindrical cell, the housing includes a casing, a top cover and a bottom cover, the casing is annular, and the top cover and the bottom cover respectively cover openings at two ends of the casing.
Exemplarily, naked electric core is hollow cylindric, and naked electric core is formed with along axial extension's centre bore, and the gas adsorption structure can fill in the centre bore this moment to make full use of battery monomer inner space.
Exemplarily, the holding chamber includes the first chamber portion of the naked electric core of holding and locates the third chamber portion on the bottom, and third chamber portion is linked together with first chamber portion, and gas adsorption structure fills in third chamber portion. That is, the third chamber section is formed on the bottom cover, and the gas adsorbing structure is fixed in position by the bottom cover, and in this case, the gas adsorbing structure may be in a powder form or include a plurality of gas adsorbing particles. Wherein, the gas adsorption structure is packaged in the third chamber portion through waterproof ventilated membrane to in before adding the lid with the bottom earlier with the gas adsorption structure be located the bottom and cover, prevent that gas adsorption particle from dropping from the third chamber portion, can avoid the gas adsorption of the gaseous adsorption structure of solvent molecule influence in the electrolyte simultaneously.
Optionally, an avoiding groove is formed in one side, facing the first cavity, of the bottom cover, a third cavity is formed by enclosing the inner wall of the avoiding groove, and the gas adsorption structure is filled in the avoiding groove, so that the existing space on the bottom cover is fully utilized, and processing and operation are facilitated. When the waterproof breathable film is required to be packaged, the waterproof breathable film can be directly covered at the notch of the avoiding groove.
The powdery gas adsorption structure can be mixed with a binder, a wetting agent and the like to prepare a gas adsorption coating so as to be coated on the cavity wall of the accommodating cavity in the battery cell or the outer surface of the bare cell to form a gas adsorption coating. The gas adsorption coating can directly contact with electrolyte at the moment to adsorb the gas in the electrolyte, alleviate the problem that naked electric core book is big to analyse lithium. The cavity wall of the accommodating cavity includes an inner surface of the housing and a surface of the top cover facing the accommodating cavity. The surface that the surface of naked electric core indicates naked electric core and electrolyte contact.
In some embodiments, the housing includes a housing and a top cover, the housing forms the receiving groove, and the top cover covers the opening of the receiving groove and forms the receiving cavity together with the housing. Particularly, the casing is including enclosing the drain pan that establishes and form annular side shell and connect in the curb plate tip, and the side shell forms the groove lateral wall of storage tank, and the drain pan forms the tank bottom wall of storage tank, and the gas adsorption coating coats in one side of the orientation holding chamber of side shell to contact with more electrolyte, thereby the gas in the better absorption electrolyte.
In some embodiments, the battery cell further includes an insulating sheet (mylar) covering the bare cell, which may be a polyester film having good heat resistance, surface smoothness, transparency, and mechanical flexibility. The gas adsorption structure comprises a gas adsorption coating, and the gas adsorption coating is coated on one side of the insulating sheet, which is back to the bare cell core, so that the gas adsorption structure is conveniently arranged on the single battery and assembled by the single battery.
In some embodiments, the housing further includes a bottom support plate disposed between the outer shell and the bottom of the bare cell, and the gas adsorption coating is coated on one side of the bottom support plate facing the bare cell, or coated on one side of the bottom support plate facing the bottom shell, or coated on one side of the bottom support plate facing the bare cell and one side of the bottom support plate facing the bottom shell, so as to facilitate the arrangement of the gas adsorption structure on the battery cell and the assembly of the battery cell.
Examples
Hereinafter, examples of the present application will be described. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the present disclosure. The examples do not specify particular techniques or conditions, and are performed according to techniques or conditions described in literature in the art or according to the product specification. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
Referring to fig. 3 and 4, the present embodiment provides a battery cell 100, which includes an outer casing, a bare cell 20, a top cap 10, an insulating sheet 40, a bottom bracket plate 50, a blue film 60, and a gas adsorption structure.
The battery monomer 100 is a lithium iron phosphate/graphite system battery monomer 100, the bare cell 20 is a sheet-shaped winding core, and the sheet-shaped winding core is a sheet-shaped component manufactured by winding and hot-pressing a positive plate, a diaphragm and a negative plate which are arranged in a laminated manner. For example, a 156Ah sheet jelly roll made of lithium iron phosphate and graphite system. The shell comprises a shell body 30 and a top cover 10, wherein the shell body 30 is made of hard materials, the shell body 30 forms an accommodating groove 311, and the top cover 10 is connected to the shell body 30 and covers the groove opening of the accommodating groove 311 so as to form an accommodating cavity together with the shell body 30. Naked electric core 20 all is located the holding intracavity with gaseous adsorption structure. Insulating sheet 40 wraps up outside naked electric core 20, and insulating sheet 40 can be used for keeping apart casing 30 and naked electric core 20 to reduce the risk of short circuit. The insulating sheet 40 may be plastic, rubber, or the like. The bottom bracket plate 50 is arranged between the bottom of the bare cell 20 and the insulating sheet 40, specifically between the insulating sheet 40 and the bottom case 32. The blue film 60 is wrapped outside the case 30.
Referring to fig. 3, a boss 11 and an explosion-proof valve screen 12 are disposed on one side of the top cover 10 facing the receiving cavity, and two bosses 11 are disposed on opposite side edges of the top cover 10, respectively, for assembling with the housing 30. The boss 11 is of a hollow structure and 5.5mm in height. The explosion-proof valve screen 12 is also of a hollow structure and has a height of 5.5mm. The holding chamber includes first chamber portion and second chamber portion, and first chamber portion is used for the naked electric core 20 of holding, and the second chamber portion is including locating the boss chamber portion in the boss 11 and locating explosion-proof valve screen cloth 12 interior screen cloth chamber portion, and boss chamber portion communicates through first mounting hole 110 and first chamber portion. The screen chamber part is communicated with the first chamber part through the second mounting hole 120, the gas adsorption structure is filled in the second chamber part, the orifices of the first mounting hole 110 and the second mounting hole 120 are respectively covered with a waterproof breathable film, and the waterproof breathable films can be used for packaging the gas adsorption structure.
In the embodiment, because the electrolyte is arranged below the accommodating cavity, a large amount of gas is gathered in the top space of the accommodating cavity, and meanwhile, the boss 11 and the explosion-proof valve screen 12 have a certain protection effect on the gas adsorption structure, the second cavity can be filled with formed gas adsorption particles, the gas adsorption shell 30 can be prepared by a nano molecular sieve, the gas adsorption particles with smaller specifications (1.7-2.5 mm, compression strength:noless than 35N/particle) are most preferably filled in the boss cavity, the gas adsorption particles with strips (1.6 mm, compression strength:noless than 30N/particle) are less preferably filled in the boss cavity, and the gas adsorption particles with larger specifications (3.2 mm, compression strength:noless than 55N/particle) are less preferably filled in the next time. It should be noted that the single maximum dimension of the gas adsorbing particles does not exceed the aperture width of the first mounting hole 110. At the screen cavity part, due to the structural particularity of the explosion-proof valve screen 12 (the aperture of the second mounting hole 120 reaches 3.0 mm), spherical particles with larger specifications can only be selected for filling, so that gas adsorption particles are prevented from falling into a cell, and the filling amount of the spherical molecular sieve is lower at the position. It should be noted that the diameter of the gas adsorption particles filled in the screen chamber portion needs to match with the second mounting hole 120, so that the gas adsorption particles can fall at the orifice of the second mounting hole 120, thereby limiting the gas adsorption particles in the screen chamber portion from falling from the second mounting hole 120. Thus, the gas adsorption structures are all arranged inside the top cover 10, no extra space of the first cavity part is occupied, no interference is caused on other structures of the battery monomer 100, and the cost of the nano molecular sieve is low.
The nano molecular sieve for preparing the gas adsorption particles in the embodiment can be one or a mixture of more of 5A, 13X, Y, ZSM-5, ZSM-11, beta, SAPO-34 and other molecular sieves.
In this embodiment, the housing 30 includes a side shell 31 and a bottom shell 32, the side shell 31 and the bottom shell 32 are disposed to form a ring shape, the side shell 31 and the bottom shell 32 together form a receiving slot 311, wherein the side shell 31 forms a slot sidewall of the receiving slot 311, and the bottom shell 32 forms a slot bottom wall of the receiving slot 311. The side casing 31 has a square cross section and includes two first side portions 311 and two second side portions 312. The top cover 10 is connected to the side shell 31 and covers the slot of the receiving slot 311 to form a receiving cavity together with the housing 30. Naked electric core 20 all is located the holding intracavity with gaseous adsorption structure.
Naked electric core 20 is equipped with two, and each naked electric core 20 coiling forms the platykurtic, rolls up the core as the slice, and the pole piece in the middle part of naked electric core 20 is straight form, and the pole piece of both ends portion is the arc form. The middle part of the bare cell 20 corresponds the first side 311 of the side shell 31, the end pole piece of the bare cell 20 corresponds the second side 312 of the side shell 31, a first mounting gap 301 is formed between the joint of the two end pole pieces of each bare cell 20 and the second side 312, the first mounting gap 301 in the battery cell 100 has two, a second mounting gap 302 is formed between the corner of the joint of the first side 311 and the second side 312 and the end pole piece of the bare cell 20, and the second mounting gap 302 in the battery cell 100 has four. The first and second mounting gaps 301 and 302 form a residual space in the battery cell 100, and the gas adsorption structure is filled in the residual space.
In this embodiment, because the residual space in the accommodation cavity of the hard-shell battery cell is more than that of the laminated battery cell and the soft-package battery cell, a nano molecular sieve with a larger particle size can be selected in the hard-shell battery cell, and the cost of the nano molecular sieve is lower than that of a hierarchical molecular sieve, so that the cost can be controlled on the basis of solving the gas generation problem of the battery cell. In practical application, the nano molecular sieve can be used for preparing spherical or strip-shaped gas adsorption particles for filling, and from the process perspective, the operability and difficulty of filling through the gas adsorption particles are extremely high.
Micron or submicron molecular sieves and nano molecular sieves of the same mass (2-8 g) are used when micron or submicron size molecular sieves (specific surface about 220-330 m) are used in a fixed period of time 2/ g) When the amount of the gas adsorbed by the gas adsorption structure is 8 to 12mL/g Molecular sieves (ii) a When the particle size of the nano molecular sieve is 80-100nm (the specific surface is about 410-800 m) 2 A gas adsorption amount of the gas adsorption structure in the range of 18 to 22 mL/g) Molecular sieves (ii) a When the nano molecular sieve particle size is preferably 40-80nm (specific surface area is about 600-920 m) 2 When per g), the gas adsorption amount is 26-31mL/g Molecular sieves 。
Therefore, in the embodiment, the gas adsorption structure can be a nano molecular sieve with the particle size range of 40-80nm, the gas adsorption amount of the gas adsorption structure can reach 26-31mL/g of the molecular sieve, and compared with the gas adsorption amount of 8-12mL/g when the micron molecular sieve or the submicron molecular sieve is selected, the gas adsorption performance of the gas adsorption structure is obviously improved, so that potential safety hazards caused by gas generation of the hard shell battery cell are eliminated, meanwhile, the situation that lithium is separated from the large surface and the corner of the hard shell battery cell due to the gas generation is relieved, the performance of the hard shell battery cell is improved, and the service life is prolonged.
In other embodiments, a powdered gas adsorption structure may be filled in the residual space of the battery cell 100. When the battery cell 100 is processed, a mold adapted to the first mounting gap 301 and the second mounting gap 302 may be first manufactured, and then the mold is filled with the powdered gas adsorbing structure to form a first gas adsorbing member adapted to the first mounting gap 301 and a second gas adsorbing member adapted to the second mounting gap 302, and then the first gas adsorbing member is inserted into the first mounting gap 301 from the notch of the receiving groove 311, and the second gas adsorbing member is inserted into the second mounting gap 302 from the notch of the receiving groove 311, so that the gas adsorbing structure is rapidly filled in the battery cell 100.
In this embodiment, referring to fig. 4, a gas adsorption coating is coated on both the side of the insulating sheet 40 facing away from the bare cell 20 and the upper and lower sides of the bottom support plate 40, and the gas adsorption coating is formed by coating a gas adsorption coating prepared by jointly using a powdered gas adsorption structure, a binder and a wetting agent. Due to the limitation of installation space, the thickness of the gas adsorption coating is not more than 10 μm, and the gas adsorption structure can be a hierarchical pore molecular sieve which can be an X-type molecular sieve or an A-type molecular sieve. The multi-level pore molecular sieve increases the specific surface of the gas adsorption structure due to the multiple pore channel structure (micropores and mesopores) of the multi-level pore molecular sieve, so that the gas adsorption efficiency is improved, and meanwhile, the multi-level pore molecular sieve can absorb moisture in the electrolyte.
Example 2
The embodiment provides a battery cell, which comprises a shell 30, a bare cell 20, a top cover 10 and a gas adsorption structure.
The bare cell 20 is a soft-package cell, for example, a soft-package cell made of lithium cobaltate and a graphite system, and the shell 30 is an aluminum-plastic film shell.
Consider that the residual space in the holding intracavity of soft-packaged electrical core is littleer than the harder shell electricity core, and the quantity of the gas adsorption structure that can fill is very limited, consequently in this embodiment, the gas adsorption structure need select for use the adsorption performance to compare in the molecular sieve multistage pore molecular sieve that is obviously better in single aperture. The hierarchical pore molecular sieve can be 5A, 13X, Y, ZSM-5, ZSM-11, beta, SAPO-34 type molecular sieve.
In order to save space, a powdery gas adsorption structure can be mixed with a binder, a wetting agent and the like to form a gas adsorption coating, the gas adsorption coating is coated on the inner surface of the shell 30, and a gas adsorption coating is formed on the inner surface of the shell 30.
When the thickness of the gas adsorption coating is 200-330 μm, the mesoporous size of the screened hierarchical pore molecular sieve can be 2-30nm, and the total specific surface area is 300-1000m 2 (ii) in terms of/g. Wherein the less preferred is 4-24nm, and the total specific surface area is 400-800m 2 The gas adsorption capacity of the gas adsorption coating under the mesoporous pore size distribution is 28-32mL/g Molecular sieves (ii) a Preferably 8-18nm, and the total specific surface area is 450-690m 2 And/g, the gas adsorption capacity of the gas adsorption coating under the mesoporous pore size distribution is 35-45mL/g molecular sieve.
Therefore, in the embodiment, the thickness of the gas adsorption coating is 50-600 μm, preferably 200-330 μm, and when the mesoporous pore size distribution of the hierarchical pore molecular sieve is 8-18nm, the gas adsorption capacity is the highest, and can reach 35-45mL/g molecular sieve. The coating process can directly use the process of the insulating coating in the production of the battery cell for reference, has high feasibility in operation and low difficulty, and can eliminate potential safety hazards caused by gas production of the soft package battery cell on the basis of delivering the soft package battery cell meeting the specification required by a customer.
Example 3
Referring to fig. 5, the present embodiment provides a battery cell 200, which includes a housing 30, a bare cell 20, a top cap 10, a bottom cap 70, and a gas adsorption structure.
The bare cell 20 may be a cylindrical cell, such as a cylindrical cell made of a high nickel and silicon-based negative electrode system. Casing 30 is cyclic annular, and the cladding is outside naked electric core 20. The top cover 10 and the bottom cover 70 cover two ports of the housing 30 respectively, and form an accommodating space together with the housing 30. Naked electric core 20 coils and is formed with centre bore 201, and centre bore 201 extends along naked electric core 20's the central axis. The center hole 201 forms a residual space in the battery cell 200, and the gas adsorption structure is filled in the residual space.
The bottom cover 70 is formed by assembling an adapter plate and a plastic piece, an avoiding groove 701 which is open towards one side of the accommodating cavity is formed between the adapter plate and the plastic piece, the avoiding groove 701 comprises a first groove portion 7011 and a second groove portion 7012 which are spaced, and the two first groove portions 7011 are symmetrically arranged and used for avoiding the shell 30 so as to realize butt joint with the shell 30. The second groove portion 7012 is provided between the two first groove portions 7011.
In this embodiment, a powder-like gas adsorption structure can be optionally filled in the avoiding groove 501, and the notch of the avoiding groove 501 is sealed by a waterproof and breathable film to prevent the gas adsorption structure from leaking. The gas adsorption structure can be selected from a hierarchical pore molecular sieve. The multi-level pore molecular sieve increases the specific surface of the gas adsorption structure due to the multiple pore channel structure (micropores and mesopores) of the multi-level pore molecular sieve, so that the gas adsorption efficiency is improved, and meanwhile, the multi-level pore molecular sieve can absorb moisture in the electrolyte.
There is not explosion-proof valve on the top cap 10 of traditional cylinder electricity core, and cylinder electricity core is because the gas production in-process, and the atmospheric pressure of formation is too big, vent (exhaust hole) upset, breaks the contact, and the CID solder joint breaks, if pressure lasts to rise, then Vent breaks, and traditional microporous molecular sieve is not enough to solve this problem, consequently need use the gas adsorption structure that the gas adsorption performance of comparing microporous molecular sieve is better. Compared with a hard-shell cell, the cylindrical cell has a smaller residual space, and compared with a soft-package cell, the residual space is significantly larger, and meanwhile, the requirement of the cylindrical cell on gas adsorption is not as strict as that of the soft-package cell, so in this embodiment, the gas adsorption structure can be a composite molecular sieve, the composite molecular sieve is formed by physically mixing a microporous molecular sieve and a mesoporous molecular sieve, and the adsorption capacity of the composite molecular sieve is higher than that of a single microporous molecular sieve, the introduction of the mesoporous molecular sieve significantly alleviates the problems that the specific surface of the microporous molecular sieve is smaller and the contact adsorption active sites are less.
Wherein, when the proportion of the microporous molecular sieve and the mesoporous molecular sieve in the composite molecular sieve is 40-60%, the gas adsorption capacity is 29-39mL/g molecular sieve. To reduce the difficulty of assembling the molecular sieve into a cylindrical cell, in this embodiment, the central hole 201 may optionally be filled with gas-adsorbing particles made of composite molecular sieve. The gas adsorption particles can be spherical and strip-shaped, and have extremely strong operability and extremely low difficulty from the process perspective. By adopting the gas adsorption structure, the single battery 200 not only maintains the original design of the central hole 201 of the cylindrical battery cell, but also does not affect the original production processes of the single battery 200, and simultaneously flexibly uses the residual space of the cylindrical battery cell to the extreme, thereby relieving or even solving the current situation of catching the forepart and catching the forepart of the explosion-proof measure for gas production of the cylindrical battery cell, upgrading the product design of the iterative cylindrical battery cell and improving the product competitiveness.
Wherein the gas adsorbent particles should not exceed the diameter of the central bore 201 at their largest dimension in the axial direction. Most preferably, the gas adsorption particle packing is smaller-sized spheres (1.7-2.5 mm, compressive strength:. Gtoreq.35N/particle), less preferably, the gas adsorption particle packing is bar-shaped (1.6 mm, compressive strength:. Gtoreq.30N/particle), and less preferably, the gas adsorption particle packing is larger-sized spheres (3.2 mm, compressive strength:. Gtoreq.55N/particle).
The proportion of the microporous molecular sieve and the mesoporous molecular sieve in the composite molecular sieve can be selected from 10 percent to 90 percent, and when the proportion is 10 percent to 30 percent, the gas adsorption capacity of the gas adsorption structure is 20 mL/g to 25mL/g Molecular sieves (ii) a When the mixture ratio is 40-60%, the gas adsorption capacity of the gas adsorption structure is 29-39mL/g Molecular sieves (ii) a When the mixture ratio is 70-90%, the gas adsorption capacity of the gas adsorption structure is 18-23mL/g Molecular sieves 。
Taking the mixture ratio of 40-60% as an example, when the mesoporous aperture of the mesoporous molecular sieve is within the range of 2-4nm, the gas adsorption capacity is 30-32mL/g Molecular sieves (ii) a When the mesoporous aperture of the mesoporous molecular sieve is within the range of 6-20nm, the gas adsorption capacity is 32-39mL/g Molecular sieves (ii) a When the mesoporous aperture of the mesoporous molecular sieve is within the range of 20-30nm, the gas adsorption capacity is 29-34mL/g Molecular sieves 。
In another embodiment of the present application, a battery is provided, which includes a case and the battery cells mentioned in the above embodiments, and the battery cells may be provided with one or more.
In some embodiments, the battery further comprises a case, and the battery cell is disposed in the case. Since the battery cell in the embodiment of the present application adopts all technical solutions of all the embodiments described above, all beneficial effects brought by the technical solutions of the embodiments also exist, and are not described in detail herein.
The battery reduces the impedance of the battery, prolongs the service life and reduces the potential safety hazard caused by gas production by arranging the battery monomer. The battery can be applied to, but not limited to, mobile phones, tablets, notebook computers, electric toys, electric tools, battery cars, electric automobiles, ships, spacecrafts and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.
In another embodiment of the present application, there is provided an electric device including the battery described above. Since the battery in the embodiment of the present application adopts all technical solutions of all the embodiments described above, all the beneficial effects brought by the technical solutions of the embodiments also exist, and are not described in detail herein.
The power consumption device of this application embodiment has adopted the change frequency of foretell battery greatly reduced potential safety hazard and battery through having adopted. The powered device may be, but is not limited to, a cell phone, tablet, laptop, electronic toy, electric tool, battery car, electric car, ship, spacecraft, and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (10)
1. The battery monomer is characterized by comprising a shell and a gas adsorption structure, wherein the shell is provided with an accommodating cavity, the gas adsorption structure is arranged in the accommodating cavity, the material of the gas adsorption structure comprises at least one of a hierarchical pore molecular sieve and a composite molecular sieve or a nano molecular sieve, and the composite molecular sieve is formed by mixing a microporous molecular sieve and a mesoporous molecular sieve.
2. The battery cell of claim 1, wherein the gas adsorbing structure comprises a plurality of gas adsorbing particles, and the material of each gas adsorbing particle comprises at least one of the nano molecular sieve, the multi-stage molecular sieve, and the composite molecular sieve or a nano molecular sieve.
3. The battery cell according to any one of claims 1 to 2, wherein the outer casing includes a casing body and a top cover, the casing body forms a receiving groove, the top cover covers a notch of the receiving groove, the battery cell further includes a bare cell disposed in the receiving cavity, the receiving cavity includes a first cavity portion for receiving the bare cell and a second cavity portion disposed in the top cover, the second cavity portion is communicated with the first cavity portion, and the gas adsorption structure is filled in the second cavity portion.
4. The battery cell of claim 3, wherein an installation gap is formed between a groove wall of the accommodating groove and an outer side surface of the bare cell core, and the gas adsorption structure is filled in the installation gap.
5. The battery cell according to any one of claims 1, 2, and 4, further comprising a bare cell disposed in the accommodating cavity, wherein the bare cell is cylindrical and is formed with a central hole extending in an axial direction, and the central hole is filled with the gas adsorbing structure.
6. The battery cell according to any one of claims 1, 2, and 4, wherein the outer casing further includes a casing, a top cover, and a bottom cover, the casing is annular, the top cover and the bottom cover respectively cover openings at two ends of the casing, and form the accommodating cavity together with the casing, the battery cell further includes a bare cell disposed in the accommodating cavity, the accommodating cavity includes a first cavity portion accommodating the bare cell and a third cavity portion disposed on the bottom cover, the third cavity portion is communicated with the first cavity portion, and the gas adsorption structure is filled in the third cavity portion.
7. The battery cell as claimed in claim 6, wherein an avoiding groove is formed in a side of the bottom cover facing the first cavity, and an inner wall of the avoiding groove surrounds the third cavity.
8. The battery cell of any one of claims 1, 2, and 4, further comprising a bare cell disposed in the accommodating cavity, wherein the gas-adsorbing structure comprises a gas-adsorbing coating applied to a cavity wall of the accommodating cavity or an outer surface of the bare cell.
9. The battery cell as recited in claim 8 wherein the housing comprises a shell and a top cover, the shell defining a receiving slot, the top cover covering the slot of the receiving slot, the shell comprising an annular side shell and a bottom shell connected to the ends of the side shell, the side shell and the bottom shell together defining the receiving slot, the gas adsorbing coating being applied to the side of the side shell facing the receiving slot.
10. A battery comprising a battery cell according to any one of claims 1 to 9.
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| CN202211483203.1A CN115832580A (en) | 2022-11-24 | 2022-11-24 | Battery cell, battery and power consumption device |
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| CN202211483203.1A CN115832580A (en) | 2022-11-24 | 2022-11-24 | Battery cell, battery and power consumption device |
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