CN111540937B - Large-capacity secondary battery and application thereof - Google Patents
Large-capacity secondary battery and application thereof Download PDFInfo
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- CN111540937B CN111540937B CN202010351655.9A CN202010351655A CN111540937B CN 111540937 B CN111540937 B CN 111540937B CN 202010351655 A CN202010351655 A CN 202010351655A CN 111540937 B CN111540937 B CN 111540937B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The embodiment of the invention relates to a high-capacity secondary battery and application thereof, wherein the high-capacity secondary battery comprises a shell and an electrode combination unit; an electrode combination unit is accommodated in the shell; the shell is an insulating shell and comprises an upper shell and a lower shell; the lower shell comprises a first accommodating area and a second accommodating area; the electrode combination unit comprises a first electrode, a second electrode, a solid electrolyte, a first electrode current collector and a second electrode current collector; the first electrode is carried on a first electrode current collector and is arranged in the first accommodating area together; the second electrode is carried on a second electrode current collector and is arranged in the second accommodating area together; the high-capacity secondary battery is used for a distributed energy storage device, an intelligent power grid cabinet and an energy storage device of a power grid or an energy storage device of an electric automobile.
Description
Technical Field
The invention relates to the field of electrochemical energy storage technology and application, in particular to a high-capacity secondary battery and application thereof.
Background
Energy is the main power for driving the development of human society, and the 21 st century has come into the information era, so the demand on energy technology is urgent. The secondary battery has the advantages of high energy density, high power density, long cycle life, environmental protection, no memory effect and the like, so that the secondary battery becomes one of the most widely and mature energy storage technologies at present. Different application scenarios have different requirements on power output and different performance requirements. Such as battery volume size, battery capacity size, customization of safety performance required for different usage environments of the battery device, and the like.
For example, lithium ion batteries mainly include button type, soft package, cylindrical and square batteries, and are all multilayer structures constructed by using main materials such as a positive electrode plate, a diaphragm, a negative electrode plate, electrolyte and the like. The manufacturing process of the battery core relates to the process steps of preparation of a positive pole piece, preparation of a negative pole piece, rolling, slitting, die cutting, winding, pole lug welding, shell entering, liquid injection, sealing and the like. The process is very complicated, the problems of multiple quality control steps, low yield, difficult customization and the like exist, and a large amount of inactive foil materials, insulating materials and shell materials are introduced, so that the energy density of the battery cell is reduced, and the safety risk is increased. And the difference of the capacity, performance and application scenario of the battery also leads to the battery being various in kind, complex in design and increased in cost of research and development and production.
Disclosure of Invention
The invention aims to provide a high-capacity secondary battery and application thereof aiming at the defects in the prior art, the modular design of battery cores is adopted, and the flexible customization of different battery capacities is realized by changing the number of battery combination units, so that the high-capacity secondary battery which is highly flexible, can be freely customized, has a simple structure, high energy density, high safety and easy maintenance is provided, and is suitable for being applied to the fields of electric automobiles, intelligent power grid cabinets, power grids, distributed energy storage and the like so as to meet the complex application requirements.
In a first aspect, the present invention provides a large-capacity secondary battery including: a housing and an electrode assembly unit; the electrode combination unit is accommodated in the shell;
the shell is an insulating shell and comprises an upper shell and a lower shell; the lower shell comprises a first accommodating area and a second accommodating area;
the electrode combination unit comprises a first electrode, a second electrode, a solid electrolyte, a first electrode current collector and a second electrode current collector;
the first electrode is carried on the first electrode current collector and is arranged in the first accommodating area together; the second electrode is carried on the second electrode current collector and is arranged in the second accommodating area together; the solid electrolyte is disposed between the first electrode and the second electrode, and the solid electrolyte partitions the first receiving area and the second receiving area into two areas isolated from each other.
Preferably, the first electrode current collector is attached to one side of the inner wall of the lower shell; the second electrode current collector is attached to the other side of the inner wall of the lower shell;
the electrode combination unit also comprises an elastic sheet; the elastic sheet is arranged between the first electrode current collector and one side of the inner wall of the lower shell.
Preferably, the upper end of the first electrode current collector penetrates through and is exposed out of the upper shell to form a first external electrode; and the upper end of the second electrode current collector penetrates through and is exposed out of the upper shell to form a second external electrode.
Preferably, the upper shell and the lower shell are symmetrically provided with sealing holes, sealing bolts penetrate through the sealing holes, and are fixed through nuts to seal the upper shell and the lower shell;
the upper shell is provided with a sealing convex part, the lower shell is provided with a sealing groove, and the sealing convex part corresponds to the sealing groove in position and is used for sealing the upper shell and the lower shell.
Preferably, the first electrode is a solid-state electrode or a gel-state electrode; the first electrode includes: an electrochemically active material, an electron conductor, an ion conductor, and a binder; wherein the ionic conductor has a conductivity of 10 or more-3S/cm；
The second electrode is specifically a liquid electrode or a gel electrode, and the second electrode includes: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel;
the ionic conductor conductivity of the solid electrolyte is not less than 10-3S/cm。
In a second aspect, the present invention provides a large-capacity secondary battery including a case, a plurality of electrode combining units, one independent second electrode, and two second electrode current collectors; the plurality of electrode combination units, the one independent second electrode and the two second electrode current collectors are accommodated in the shell together;
the shell is an insulating shell and comprises an upper shell and a lower shell; the lower shell comprises n first accommodating areas and n +1 second accommodating areas; the first accommodating area and the second accommodating area are sequentially arranged adjacently; n is a positive integer;
each electrode combination unit comprises a double-sided composite first electrode, a second electrode, a solid electrolyte and a first electrode current collector; the double-sided composite first electrode comprises two first electrodes which are loaded on two sides of the same first electrode current collector, the outer surfaces of the double-sided composite first electrodes are wrapped by the solid electrolyte, and each double-sided composite first electrode wrapped by the solid electrolyte is arranged in one first accommodating area; the second electrode is disposed in the second receiving area on a first side of the first receiving area, the second electrode being in contact with the solid electrolyte; the solid electrolyte divides the first accommodation area and the second accommodation area into mutually isolated areas;
the independent second electrode is arranged in a second accommodating area of the second side of the first electrode combination unit positioned on the second side in the lower shell; the second side is the first side-to-side; and the independent second electrode is carried on a second electrode current collector;
the second electrode of the first electrode combination unit positioned on the first side in the lower shell is carried on the other second electrode current collector;
and the two second electrode current collectors are respectively attached to the inner walls of the first side and the second side of the lower shell.
Preferably, the upper end of the first electrode current collector penetrates through and is exposed out of the upper shell to form a first external electrode; and the upper end of the second electrode current collector penetrates through and is exposed out of the upper shell to form a second external electrode.
Preferably, the upper shell and the lower shell are symmetrically provided with sealing holes, sealing bolts penetrate through the sealing holes, and are fixed through nuts to seal the upper shell and the lower shell;
the upper shell is provided with a sealing convex part, the lower shell is provided with a sealing groove, and the sealing convex part corresponds to the sealing groove in position and is used for sealing the upper shell and the lower shell.
Preferably, the first electrode is a solid-state electrode or a gel-state electrode; the first electrode includes: an electrochemically active material, an electron conductor, an ion conductor, and a binder; wherein the ionic conductor has a conductivity of 10 or more-3S/cm；
The second electrode is a liquid electrode or a gel electrode; the second electrode includes: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel;
the independent second electrode is a liquid electrode or a gel electrode; the independent second electrode includes: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel;
the ionic conductor conductivity of the solid electrolyte is not less than 10-3S/cm。
In a third aspect, the present invention provides a use of the large-capacity secondary battery according to the first or second aspect for a distributed energy storage device, an energy storage device for a smart grid locker and grid, or an energy storage device for an electric vehicle.
The high-capacity secondary battery provided by the embodiment of the invention adopts a solid-liquid phase combination mode, not only solves the problems of easy leakage, low stability and large volume of a pure liquid battery, but also solves the problem of battery damage caused by the increase of the temperature of an all-solid battery, and moreover, the solid electrolyte layer is adopted to replace the traditional electrolyte and a diaphragm, so that the interface relationship in the battery is simple. Through the separable structure of upper and lower casing, realized can open the upper casing through simple operation and carry out electrode material's interpolation after the battery uses a period to realize the simple and easy maintenance of battery, realize long-life circulation, very big promotion volume energy density simultaneously. Based on the structure of the high-capacity secondary battery, the modular design of the battery cell is carried out, so that the secondary battery with required capacity can be rapidly developed according to the requirements of users by changing the number of the battery combination units, the number of structural parts and the complexity of devices are reduced, the development period and the cost are saved, and the energy density and the service life can be improved.
Drawings
Fig. 1 is an exploded perspective view of a large-capacity secondary battery provided in embodiment 1 of the present invention;
fig. 2 is a perspective view of a large-capacity secondary battery provided in example 1 of the present invention;
fig. 3 is an exploded perspective view of a large-capacity secondary battery provided in embodiment 2 of the present invention;
fig. 4 is a perspective view of a large-capacity secondary battery provided in example 2 of the present invention;
fig. 5 is a perspective sectional view of a large-capacity secondary battery provided in example 3 of the invention;
fig. 6 is a perspective view of a large-capacity secondary battery provided in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.
Example 1
Fig. 1 is an exploded perspective view of a large-capacity secondary battery provided in embodiment 1 of the present invention. As shown in fig. 1, the large-capacity secondary battery includes a case 1 and an electrode assembly unit 2; an electrode assembly unit 2 is accommodated in the case 1.
Fig. 2 is a perspective view of a large-capacity secondary battery provided in example 1 of the present invention. As shown in fig. 2, the housing 1 includes two parts, an upper housing 11 and a lower housing 12; the lower housing 12 includes two receiving areas, which are a first receiving area (not shown) and a second receiving area (not shown).
As shown in fig. 1 and 2, sealing holes 13 are provided at symmetrical positions of the upper housing 11 and the lower housing 12, and sealing bolts 14 are inserted into the sealing holes 13 and fixed by nuts 15 to seal the upper housing 11 and the lower housing 12; by means of sealing screwsThe bolt 14 and the nut 15 are sealed in a manner that the battery can be conveniently opened, electrode materials can be supplemented into the battery, and CO generated by electrochemical reaction in the battery can be released2Etc. to maintain the battery in a long cycle.
In order to completely isolate the internal environment of the large-capacity secondary battery from the external environment, a sealing protrusion (not shown) is further disposed on the upper case 11, and a sealing groove 121 is disposed on the lower case 12, and the sealing protrusion and the sealing groove 121 are located at corresponding positions to seal the upper case 11 and the lower case 12.
In this embodiment, the housing material is preferably an insulating material such as Polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), or a multilayer polymer-metal foil (mesh). On the premise of realizing a battery supporting structure, the insulativity between battery electrodes is ensured, and the short circuit and self-discharge behavior in the battery can be effectively avoided.
The electrode assembly unit 2 includes a first electrode 21, a second electrode 22, a solid electrolyte 23, a first electrode collector 24, and a second electrode collector 25.
The first electrode 21 is carried on a first electrode current collector 24 and is disposed together in the first receiving area.
In the present embodiment, the first electrode 21 is specifically a solid-state electrode or a gel-state electrode; the solid-state electrode or the gel-state electrode is merely used for illustration, but does not limit the state range of the first electrode 21, and the first electrode 21 specifically includes: an electrochemically active material, an electron conductor, an ion conductor, and a binder; the electronic conductor preferably adopts acetylene black, ketjen black, conductive carbon black (Super P), activated carbon, graphite, graphene, carbon nanotubes and the like; the ionic conductor has high ionic conductivity (more than or equal to 10)- 3S/cm) fast ion conductor; the binder is preferably polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), styrene-butadiene latex (SBR), or the like.
The second electrode 22 is carried on a second electrode current collector 25 and is disposed together in the second receiving area.
In the present embodiment, the second electrode 22 is specifically a liquid electrode or a gel electrode, the liquid electrode or the gel electrode is only used for illustration, but not limited to the state range of the second electrode 22, and the second electrode 22 specifically includes: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel.
The solid electrolyte 23 has high ionic conductivity (not less than 10)-3S/cm) of fast ion conductor. Which is disposed between the first electrode 21 and the second electrode 22, and divides the first receiving region and the second receiving region into two regions isolated from each other. The solid electrolyte 23 is used as an ion transport layer and an electron blocking layer, the first electrode 21 and the second electrode 22 are isolated, energy is provided by means of a reversible electrochemical reaction process of electrochemical active substances in the first electrode 21 and the second electrode 22, the isolation of the solid electrolyte 23 can ensure that electrons flow from an external circuit of the battery, so that short circuit in the battery is avoided, and the self-discharge rate can be reduced; meanwhile, the solid electrolyte 23 is adopted to replace the traditional electrolyte and diaphragm, so that the battery is simple in structure, and is safer, more stable and longer in service life cycle compared with the traditional battery adopting the electrolyte.
The first electrode collector 24 is attached to one side of the inner wall of the lower case 12, and the upper end thereof penetrates through and is exposed outside the upper case 11, thereby constituting a first external electrode 31. The first electrode collector 24 is in close contact with the first electrode 21 to provide an electron transport path for the first electrode 21.
The second electrode collector 25 is attached to the other side of the inner wall of the lower case 12; and the upper end thereof penetrates and is exposed out of the upper case 11 to constitute a second external electrode 32.
The first electrode collector 24 is preferably made of aluminum foil, and the second electrode collector 25 is preferably made of a porous copper mesh, which increases the contact area with the second electrode 22 and reduces the polarization of the battery.
In addition, in order to avoid the peeling between the first electrode 21 and the first electrode current collector 24, the electrode assembly unit 2 further includes an elastic sheet 26; the elastic pieces 26 are disposed between the first electrode collector 24 and one side of the inner wall of the lower case 12, and the elastic pieces 26 may also provide a continuous supporting force.
The large-capacity secondary battery in the embodiment can realize the adjustability of the battery capacity by increasing or decreasing the thickness and the area of the first electrode and the concentration and the volume of the second electrode. In addition, the recovery process of the battery is simple, all components can be recovered in a classified mode, and the cost of the battery is fully reduced.
In the following embodiments, the specific materials of the casing material, the first electrode, the second electrode, the solid electrolyte, the first electrode current collector, and the second electrode current collector are the same as those described above, and are not repeated.
Example 2
The large-capacity secondary battery provided in this embodiment is obtained by performing modular design suitable for expansion on the battery cells of the large-capacity secondary battery in embodiment 1 to obtain a structure suitable for an expanded battery combination unit, so that different capacity requirements can be met by controlling the number of the battery combination units, and a customizable secondary battery is provided.
In this example 2, we provide a large-capacity secondary battery comprising a set of battery combination units.
Fig. 3 is an exploded perspective view of a large-capacity secondary battery provided in embodiment 2 of the present invention. As shown in fig. 3, the large-capacity secondary battery includes a case 1, one electrode assembly unit 2, one independent second electrode 3, and two second electrode current collectors 4; one electrode assembly unit 2, one independent second electrode 3 and two second electrode current collectors 4 are housed together in the case 1.
Fig. 4 is a perspective view of a large-capacity secondary battery provided in embodiment 2 of the present invention. As shown in fig. 4, the housing 1 includes two parts, an upper housing 11 and a lower housing 12; the lower housing 12 includes a first receiving area (not shown) and two second receiving areas (not shown); the first containing area is located in the middle, and the two second containing areas are located on two sides of the first containing area respectively. The technical solution of embodiment 1 is adopted for the sealing solution between the upper shell 11 and the lower shell 12.
As shown in fig. 3 and 4, an electrode assembly unit 2 includes a double-sided composite first electrode 21, a second electrode 22, a solid electrolyte 23, and a first electrode current collector 24.
The double-sided composite first electrode 21 comprises two first electrodes 211 carried on two sides of the same first electrode current collector 24, the outer surface of the double-sided composite first electrode 21 is wrapped by the solid electrolyte 23, and the double-sided composite first electrode 21 wrapped by each solid electrolyte 23 is placed in one first accommodation area.
The second electrode 22 is disposed in the second receiving area on the first side of the first receiving area, and the second electrode 22 is in contact with the solid electrolyte 23 and is carried on one second electrode current collector 4.
A second accommodating area of the independent second electrode 3 arranged in the lower shell 12 and positioned at the second side of the electrode combination unit 2; the second side is the first side opposite side; and the separate second electrode 3 is carried on another second electrode current collector 4. It should be noted that the independent second electrodes 3 and 22 are only used here to make the description clearer, and it is easier to understand the technical solution that the independent second electrodes 3 and 22 are the same in the actual implementation.
The solid electrolyte 23 encapsulates the double-sided composite first electrode 21, and partitions the first receiving region and the second receiving region into mutually isolated regions, thereby completely isolating electron transport between the first electrode 211 and the second electrode 22. The solid electrolyte 23 is used as an ion transmission layer and an electronic blocking layer, energy is provided by means of a reversible electrochemical reaction process of electrochemical active substances in the first electrode 21 and the second electrode 22 which are compounded on the two sides, and the isolation of the solid electrolyte 23 can ensure that electrons can flow from an external circuit of the battery, ensure that no short circuit occurs in the battery, and reduce the self-discharge rate; meanwhile, the solid electrolyte 23 is adopted to replace the traditional electrolyte and diaphragm, so that the battery is simple in structure, and is safer, more stable and longer in service life cycle compared with the traditional battery adopting the electrolyte.
The first electrode collector 24 is disposed in the middle of the double-sided composite first electrode 21, and the upper end of the first electrode collector passes through and is exposed outside the upper case 11, thereby forming a first external electrode 31.
Two second electrode current collectors 4 are attached to inner walls of the first and second sides of the lower case 12, respectively. And the upper ends thereof respectively penetrate through and are exposed out of the upper shell 11 to respectively form second external electrodes 32.
This embodiment adopts two-sided compound first electrode to set up the second electrode respectively in its both sides, not only avoided peeling off of first electrode and first electrode mass flow body, improved the area of contact of first electrode and second electrode moreover, thereby improve ion transmission rate, also have great meaning to the promotion of battery power density. The current collector of the second electrode adopts a multi-stage design, and the electron transmission rate of the second electrode and an external circuit is expected to be promoted.
Example 3
The large-capacity secondary battery provided in this example is a customized secondary battery obtained by selecting a corresponding number of battery combination units of the large-capacity secondary battery of example 2 according to different requirements.
Fig. 5 is a perspective sectional view of a large-capacity secondary battery provided in example 3 of the present invention. As shown in fig. 5, the large-capacity secondary battery includes a case 1, a plurality of electrode combining units 2, one independent second electrode 3, and two second electrode current collectors 4; a plurality of electrode assembly units 2, one independent second electrode 3, and two second electrode current collectors 4 are housed together in the case 1.
Fig. 6 is a perspective view of a large-capacity secondary battery provided in example 3 of the present invention. As shown in fig. 6, the housing 1 includes two parts, an upper housing 11 and a lower housing 12; the lower case 12 includes n first receiving areas (not shown) and n +1 second receiving areas (not shown); the first accommodating area and the second accommodating area are sequentially arranged adjacently; n is a positive integer. The technical solution of embodiment 1 is adopted for the sealing solution between the upper shell 11 and the lower shell 12.
As shown in fig. 5 and 6 in conjunction, each electrode assembly unit 2 includes a double-sided composite first electrode 21, a second electrode 22, a solid electrolyte 23, and a first electrode current collector 24.
The double-sided composite first electrode 21 comprises two first electrodes 211 carried on two sides of the same first electrode current collector 24, the outer surface of the double-sided composite first electrode 21 is wrapped by the solid electrolyte 23, and the double-sided composite first electrode 21 wrapped by each solid electrolyte 23 is placed in one first accommodation area.
The second electrode 22 is disposed in the second receiving area on the first side of the first receiving area, the second electrode 22 is in contact with the solid electrolyte 23, and the second electrode 22 of the first electrode assembly unit on the first side in the lower case 12 is carried on one second electrode current collector 4.
An independent second electrode 3 is arranged in a second accommodating area of the second side of the first electrode combination unit 25 on the second side in the lower shell 12; the second side is the first side opposite side; and the independent second electrode 3 is carried on another second electrode current collector 4; it should be noted that the independent second electrodes 3 and 22 are only used for clarity of description, and it is easier to understand the technical solution that the independent second electrodes 3 and 22 are the same in actual implementation.
The structure and function of the solid electrolyte 23 adopt the technical scheme in example 2, and are not described in detail.
The first electrode collector 24 is disposed in the middle of the double-sided composite first electrode 21, and the upper end of the first electrode collector passes through and is exposed outside the upper case 11, thereby forming a first external electrode 31.
Two second electrode current collectors 4 are attached to inner walls of the first and second sides of the lower case 12, respectively. And the upper ends thereof respectively penetrate through and are exposed out of the upper shell 11 to respectively form second external electrodes 32.
The capacity of the high-capacity secondary battery provided by the embodiment can be changed at will according to actual requirements, and the large-capacity secondary battery can be easily realized by simply changing the size of the battery shell and increasing or decreasing the number of the battery combination units, so that the application scenes of the battery are greatly widened.
The high-capacity secondary battery provided by the embodiment of the invention adopts a solid-liquid phase combination mode, not only solves the problems of easy leakage, low stability and large volume of a pure liquid battery, but also solves the problem of battery damage caused by the increase of the temperature of an all-solid battery, and moreover, the solid electrolyte layer is adopted to replace the traditional electrolyte and a diaphragm, so that the interface relationship in the battery is simple. Through the separable structure of upper and lower casing, realized can open the upper casing through simple operation and carry out electrode material's interpolation after the battery uses a period to realize the simple and easy maintenance of battery, realize long-life circulation, very big promotion volume energy density simultaneously. Based on the structure of the high-capacity secondary battery, the modular design of the battery cell is carried out, so that the secondary battery with required capacity can be rapidly developed according to the requirements of users by changing the number of the battery combination units, the number of structural parts and the complexity of devices are reduced, the development period and the cost are saved, and the energy density and the service life can be improved.
The high-capacity secondary battery obtained by the invention can be widely applied to distributed energy storage devices, intelligent power grid cabinets and energy storage devices of power grids or energy storage devices of electric vehicles.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A large-capacity secondary battery, characterized in that the large-capacity secondary battery comprises a case and an electrode assembly unit; the electrode combination unit is accommodated in the shell;
the shell is an insulating shell and comprises an upper shell and a lower shell; the upper shell and the lower shell are fixedly sealed through a sealing bolt and a sealing nut; the lower shell comprises a first accommodating area and a second accommodating area; the shell is made of polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene or any one of a plurality of layers of polymer-metal foils or a plurality of layers of polymer-metal nets;
the electrode combination unit comprises a first electrode, a second electrode, a solid electrolyte, a first electrode current collector and a second electrode current collector;
the first electrode is carried on the first electrode current collector and is arranged in the first accommodating area together; the second electrode is carried on the second electrode current collector and is arranged in the second accommodating area together; the solid electrolyte is arranged between the first electrode and the second electrode, and the solid electrolyte divides the first accommodation area and the second accommodation area into two areas which are isolated from each other; wherein the first electrode is a gel electrode; the second electrode is a liquid electrode or a gel electrode; adjusting the capacity of the secondary battery by increasing or decreasing the thickness and area of the first electrode and the concentration and volume of the second electrode; wherein the second electrode comprises: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel;
and the upper end of the second electrode current collector penetrates through and is exposed out of the upper shell to form a second external electrode.
2. The large capacity secondary battery according to claim 1, wherein the first electrode current collector is attached to one side of the inner wall of the lower case; the second electrode current collector is attached to the other side of the inner wall of the lower shell;
the electrode combination unit also comprises an elastic sheet; the elastic sheet is arranged between the first electrode current collector and one side of the inner wall of the lower shell.
3. A large capacity secondary battery as claimed in claim 1, wherein the upper end of the first electrode current collector passes through and is exposed to the outside of the upper case, constituting a first external electrode.
4. A large capacity secondary battery as claimed in claim 1, wherein the upper and lower cases are symmetrically provided with sealing holes, sealing bolts are inserted into the sealing holes, and are fixed by nuts for sealing the upper and lower cases;
the upper shell is provided with a sealing convex part, the lower shell is provided with a sealing groove, and the sealing convex part corresponds to the sealing groove in position and is used for sealing the upper shell and the lower shell.
5. The large capacity secondary battery according to claim 1, wherein the first electrode comprises: an electrochemically active material, an electron conductor, an ion conductor, and a binder; wherein the ionic conductor has a conductivity of 10 or more-3S/cm; the ionic conductor conductivity of the solid electrolyte is not less than 10-3 S/cm。
6. A large-capacity secondary battery, comprising a case, a plurality of electrode assembly units, one independent second electrode, and two second electrode current collectors; the plurality of electrode combination units, the one independent second electrode and the two second electrode current collectors are accommodated in the shell together;
the shell is an insulating shell and comprises an upper shell and a lower shell; the upper shell and the lower shell are fixedly sealed through a sealing bolt and a sealing nut; the lower shell comprises n first accommodating areas and n +1 second accommodating areas; the first accommodating area and the second accommodating area are sequentially arranged adjacently; n is a positive integer; the shell is made of polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene or any one of a plurality of layers of polymer-metal foils or a plurality of layers of polymer-metal nets;
each electrode combination unit comprises a double-sided composite first electrode, a second electrode, a solid electrolyte and a first electrode current collector; the double-sided composite first electrode comprises two first electrodes which are loaded on two sides of the same first electrode current collector, the outer surfaces of the double-sided composite first electrodes are wrapped by the solid electrolyte, and each double-sided composite first electrode wrapped by the solid electrolyte is arranged in one first accommodating area; the second electrode is disposed in the second receiving area on a first side of the first receiving area, the second electrode being in contact with the solid electrolyte; the solid electrolyte divides the first accommodation area and the second accommodation area into mutually isolated areas;
the independent second electrode is arranged in a second accommodating area of the second side of the first electrode combination unit positioned on the second side in the lower shell; the second side is the first side-to-side; and the independent second electrode is carried on a second electrode current collector;
the second electrode of the first electrode combination unit positioned on the first side in the lower shell is carried on the other second electrode current collector;
the two second electrode current collectors are respectively attached to the inner walls of the first side and the second side of the lower shell; wherein the first electrode is a gel electrode; the second electrode is a liquid electrode or a gel electrode; adjusting the capacity of the secondary battery by increasing or decreasing the thickness and area of the first electrode and the concentration and volume of the second electrode; wherein the second electrode comprises: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel;
the independent second electrode is a liquid electrode or a gel electrode; the independent second electrode includes: one or more of room temperature liquid metal or room temperature gel state metal, room temperature liquid metal and aromatic mixed solution or room temperature gel state metal and aromatic mixed gel, room temperature liquid metal and ether mixed solution or room temperature gel state metal and ether mixed gel, alkali metal and aromatic mixed solution or gel, alkali metal and ether mixed solution or gel, and metal sulfide ether solvent or gel;
and the upper end of the second electrode current collector penetrates through and is exposed out of the upper shell to form a second external electrode.
7. A large capacity secondary battery as claimed in claim 6, wherein the upper end of the first electrode current collector passes through and is exposed to the outside of the upper case, constituting a first external electrode.
8. A large capacity secondary battery as claimed in claim 6, wherein the upper and lower cases are symmetrically provided with sealing holes, sealing bolts are inserted into the sealing holes, and are fixed by nuts for sealing the upper and lower cases;
the upper shell is provided with a sealing convex part, the lower shell is provided with a sealing groove, and the sealing convex part corresponds to the sealing groove in position and is used for sealing the upper shell and the lower shell.
9. The large capacity secondary battery according to claim 6, wherein the first electrode comprises: an electrochemically active material, an electron conductor, an ion conductor, and a binder; wherein the ionic conductor has a conductivity of 10 or more-3S/cm; the ionic conductor conductivity of the solid electrolyte is not less than 10-3 S/cm。
10. Use of a large-capacity secondary battery as claimed in any one of claims 1 to 5 or 6 to 9, wherein the large-capacity secondary battery is used for a distributed energy storage device, an energy storage device for a smart grid cabinet and grid, or an energy storage device for an electric vehicle.
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