CN111799427A - Energy storage device of bipolar conductive film connection structure - Google Patents

Energy storage device of bipolar conductive film connection structure Download PDF

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Publication number
CN111799427A
CN111799427A CN201910277091.6A CN201910277091A CN111799427A CN 111799427 A CN111799427 A CN 111799427A CN 201910277091 A CN201910277091 A CN 201910277091A CN 111799427 A CN111799427 A CN 111799427A
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energy storage
electrode
adjacent
storage unit
bipolar conductive
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李长明
吴超
辛程勋
辛民昌
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Qingdao Jiuhuan Xinyue New Energy Technology Co ltd
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Qingdao Jiuhuan Xinyue New Energy Technology Co ltd
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Priority to CN201910277091.6A priority Critical patent/CN111799427A/en
Priority to PCT/CN2020/083417 priority patent/WO2020207362A1/en
Publication of CN111799427A publication Critical patent/CN111799427A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66—Current collectors
    • H01G11/72—Current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
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Abstract

The invention discloses energy storage equipment with a bipolar conductive film connecting structure, which comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by adopting a bipolar conductive film which can conduct electrons and isolate ion conduction; the energy storage unit comprises an ion membrane which is electrically insulated but can be subjected to ion conduction or electrolyte to pass through, and a first electrode and a second electrode are respectively arranged on two sides of the ion membrane. Multiple connection modes can be realized among the energy storage units: 1) series connection: the output voltage is effectively improved; 2) parallel connection: the output current is effectively improved; 3) and (3) series-parallel connection: all the energy storage units are divided into at least two energy storage groups, and when the energy storage units belonging to the same energy storage group are connected in series, the energy storage groups can be connected in parallel, so that series-parallel connection is realized, and voltage can be output according to requirements; or when the energy storage units belonging to the same energy storage group are connected in parallel, the energy storage groups can be connected in series, so that the series-parallel connection is realized, and the current can be output according to the requirement.

Description

Energy storage device of bipolar conductive film connection structure
Technical Field
The invention belongs to the technical field of energy storage equipment, and particularly relates to energy storage equipment with a bipolar conductive thin film connecting structure.
Background
The existing lithium ion battery comprises a positive electrode, a negative electrode and an ionic membrane, wherein an electrolyte is arranged between the positive electrode and the negative electrode. According to the charge-discharge principle of the lithium ion battery, the following characteristics are found: the charge and discharge process of the lithium ion battery is the process of lithium ion intercalation and deintercalation. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure having many pores, and lithium ions reaching the negative electrode are inserted into the pores of the carbon layer, and the more lithium ions are inserted, the higher the charge capacity is. Similarly, when the battery is discharged, lithium ions embedded in the negative carbon layer are extracted and move back to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity.
The rated voltage of the lithium ion battery varies depending on the material, and is generally 3.7V (3.2V when lithium iron phosphate is used as the positive electrode), and the end-charging voltage at the time of full charge is generally 4.2V (3.65V when lithium iron phosphate is used as the positive electrode). When the lithium ion battery is used as a power battery, a plurality of lithium ion batteries are often required to be connected in series due to the fact that the voltage of a single lithium ion battery is too low, and although the use requirement can be met to a certain extent, the size and the weight of a battery pack can be increased undoubtedly by the lithium ion batteries connected in series.
Disclosure of Invention
In view of the above, the present invention provides an energy storage device with a bipolar conductive film connection structure, which is capable of outputting a required voltage according to requirements and has the advantages of compact structure and small size.
In order to achieve the purpose, the invention provides the following technical scheme:
the energy storage device with the bipolar conductive film connection structure comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by adopting a bipolar conductive film which can conduct electrons and isolate ion conduction; the energy storage unit comprises an ion membrane which is electronically insulated and can be subjected to ion conduction or electrolyte penetration, and a first electrode and a second electrode are respectively arranged on two sides of the ion membrane;
in two adjacent energy storage units, the second electrode of one energy storage unit is adjacent to the first electrode of the other energy storage unit, and the adjacent second electrode and the adjacent first electrode are connected by adopting the bipolar conductive film; or the like, or, alternatively,
in two adjacent energy storage units, the first electrode of one energy storage unit and the first electrode of the other energy storage unit are adjacently arranged, or the second electrode of one energy storage unit and the second electrode of the other energy storage unit are adjacently arranged, and the two adjacent first electrodes or the two adjacent second electrodes are connected by adopting the bipolar conductive film; in all the bipolar conductive films, the bipolar conductive films positioned between two adjacent first electrodes are in conductive connection by adopting an external circuit or an internal circuit, and the bipolar conductive films positioned between two adjacent second electrodes are in conductive connection by adopting an external circuit or an internal circuit; or the like, or, alternatively,
the two adjacent energy storage units form an energy storage group, the second electrode of one energy storage unit and the first electrode of the other energy storage unit are adjacently arranged in the two adjacent energy storage units belonging to the same energy storage group, and the bipolar conductive film is arranged between the second electrode and the first electrode which are adjacent to each other and connected with each other; in two adjacent energy storage groups, the first electrode at one end of one energy storage group is arranged adjacent to the first electrode at the other end of the other energy storage group, or the second electrode at one end of the energy storage group is arranged adjacent to the second electrode at the other end of the energy storage group, and the bipolar conductive thin films between the two adjacent first electrodes or between the two adjacent second electrodes are connected by adopting a first electric conductor which can conduct electrons but isolate ion conduction, and all the bipolar conductive thin film first electric conductors positioned between the energy storage groups, the first conductor bipolar conductive films between two adjacent first electrodes are in conductive connection by adopting an external circuit or an internal circuit, and the first conductor bipolar conductive films between two adjacent second electrodes are in conductive connection by adopting an external circuit or an internal circuit; or the like, or, alternatively,
at least two adjacent energy storage units form an energy storage group, in two adjacent energy storage units belonging to the same energy storage group, the first electrode of one energy storage unit and the first electrode of the other energy storage unit are adjacently arranged, or the second electrode of one energy storage unit and the second electrode of the other energy storage unit are adjacently arranged, and the two adjacent first electrodes or the two adjacent second electrodes are connected by adopting the bipolar conductive film; in all the bipolar conductive thin films in the same energy storage group, the bipolar conductive thin films between two adjacent first electrodes are in conductive connection by adopting an external circuit or an internal circuit, and the bipolar conductive thin films between two adjacent second electrodes are in conductive connection by adopting an external circuit or an internal circuit; in two adjacent energy storage groups, a first electrode at one end of one energy storage group is adjacent to a second electrode at the other end of the other energy storage group, and a bipolar conductive film between the adjacent first electrode and the adjacent second electrode is connected by a first electric conductor capable of conducting electrons but isolating ionic conduction.
Further, the number of the energy storage units contained in all the energy storage groups is equal.
Further, the energy storage unit is a battery energy storage unit, and the first electrode and the second electrode are respectively a positive electrode and a negative electrode of the battery energy storage unit; the ionic membrane is positioned between the positive electrode and the negative electrode belonging to the same battery energy storage unit.
Furthermore, the energy storage unit is a capacitive energy storage unit, the first electrode and the second electrode are respectively a first capacitive electrode and a second capacitive electrode of the capacitive energy storage unit, and the ionic membrane is located between the first capacitive electrode and the second capacitive electrode which belong to the same capacitive energy storage unit.
Further, the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material or different capacitor electrode materials.
Furthermore, the energy storage unit is a hybrid energy storage unit, the first electrode is made of a battery anode material or a battery cathode material, and the second electrode is made of a capacitor electrode material; or the first electrode is made of a capacitance electrode material, and the second electrode is made of a battery anode material or a battery cathode material.
Furthermore, the thickness of the ionic membrane is more than or equal to 1nm, the thickness of the first electrode is more than or equal to 1nm, and the thickness of the second electrode is more than or equal to 1 nm.
Further, the bipolar conductive film is used as the first and second conductive bodies.
Further, the bipolar conductive film is coated on a side of the corresponding first electrode or second electrode.
Furthermore, the bipolar conductive film is arranged on the first electrode of one of the two adjacent battery energy storage units and/or the second electrode of the other adjacent battery energy storage unit; or the like, or, alternatively,
the bipolar conductive film is arranged on the first electrode of one of the two adjacent battery energy storage units and/or the first electrode of the other battery energy storage unit adjacent to the first electrode; or the like, or, alternatively,
and in two adjacent battery energy storage units, the second electrode of one battery energy storage unit and/or the second electrode of the other battery energy storage unit adjacent to the second electrode are/is provided with the bipolar conductive film.
Further, the bipolar conductive thin film is made of, but not limited to, carbon, graphite, graphene or metal film.
Further, the thickness of the bipolar conductive film is more than or equal to 1 nm.
Furthermore, the ionic membrane and the first electrode which belong to the same energy storage unit are arranged into a whole; or the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole; or the first electrode, the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole.
Furthermore, the bipolar conductive film comprises a substrate, conductive layers are respectively arranged on two sides of the substrate, and the two conductive layers are in conductive connection; or, the base body is filled with a conductive material, and the conductive material is respectively exposed from the side surfaces of the two sides of the base body; or the substrate is a conductive film which is good in electric conduction and ion isolation, and the conductive film is directly used as a bipolar conductive film.
Furthermore, the substrate is made of metal foil or a non-metal film.
Further, the metal foil includes, but is not limited to, copper foil, aluminum foil, or steel foil; the non-metal film includes but is not limited to polymer, carbon fiber and graphene.
Furthermore, hollow holes are formed in the base body in an array mode, and the conductive layer materials located on the two sides of the base body are filled in the hollow holes to achieve conductive connection; or the hollow hole is filled with the conductive material.
Furthermore, the substrate adopts a reticular metal foil or a reticular non-metal film, and the conductive layer materials positioned at two sides of the substrate fill the reticular space of the reticular metal foil or the reticular non-metal film and realize conductive connection; or the mesh-shaped space of the base body is filled with the conductive material.
Furthermore, the reticular metal foil adopts reticular copper foil, and the reticular non-metal film adopts reticular carbon fiber.
Further, the thickness of the base material is greater than or equal to 1nm, and the thickness of the conductive layer is greater than or equal to 0.5 nm.
Furthermore, the end part of the bipolar conductive film is provided with a tab.
Furthermore, the ionic membrane and the first electrode which belong to the same energy storage unit are arranged into a whole; or the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole; or the first electrode, the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole.
Further, the bipolar conductive film is made of a film which can conduct electrons but insulate ions from conducting.
The invention has the beneficial effects that:
according to the energy storage device with the bipolar conductive film connecting structure, the energy storage units are arranged, so that various connecting modes can be realized among the energy storage units:
1) series connection: the first electrodes and the second electrodes which respectively belong to the two energy storage units are adjacently arranged, so that when a bipolar conductive film is arranged between the first electrodes and the second electrodes of the two adjacent energy storage units, the two adjacent energy storage units can be connected in series, and all the energy storage units which are sequentially arranged can be connected in series, so that the output voltage is effectively improved;
2) parallel connection: arranging first electrodes respectively belonging to two energy storage units adjacently, and arranging a bipolar conductive film and a lug between the two adjacently arranged first electrodes, or arranging second electrodes respectively belonging to two energy storage units adjacently, and arranging a bipolar conductive film and a lug between the two adjacently arranged second electrodes; the two adjacent energy storage units can be connected in parallel, so that all the energy storage units which are sequentially arranged can be connected in parallel, and the output current is effectively improved;
3) and (3) series-parallel connection: all the energy storage units are divided into at least two energy storage groups, and when the energy storage units belonging to the same energy storage group are connected in series, the energy storage groups can be connected in parallel, so that series-parallel connection is realized, and voltage can be output according to requirements; or when the energy storage units belonging to the same energy storage group are connected in parallel, the energy storage groups can be connected in series, so that the parallel connection is realized, and the current can be output according to the requirement;
in conclusion, the energy storage device with the bipolar conductive film connection structure can be connected in series, in parallel or in series-parallel, namely, the output voltage or the output current can be changed according to the use requirement, so that the use is more flexible and changeable; and all energy storage units are arranged in sequence, so that the existing packaging structure of a single battery is omitted, the structure is more compact, the size is smaller, and the weight is lighter.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a schematic structural diagram of an energy storage device in embodiment 1 of the bipolar conductive film connection structure according to the present invention, specifically, the bipolar conductive film of the embodiment is coated on the corresponding first electrode and second electrode, and all energy storage units are connected in series;
FIG. 2 is a schematic structural diagram of an energy storage device with a bipolar conductive film connection structure when the bipolar conductive films are independently arranged;
FIG. 3 is a schematic structural view of a bipolar conductive film provided with a conductive layer;
FIG. 4 is a schematic structural diagram of a bipolar conductive film when filled with a conductive material;
FIG. 5 is a schematic structural diagram of an energy storage device with a bipolar conductive thin film connection structure when an ionic membrane is integrated with a first electrode;
FIG. 6 is a schematic structural diagram of an energy storage device with a bipolar conductive thin film connection structure when an ionic membrane is integrated with a second electrode;
FIG. 7 is a schematic structural diagram of an energy storage device with a bipolar conductive thin film connection structure when a first electrode, an ionic membrane and a second electrode are integrated;
fig. 8 is a schematic structural diagram of an energy storage device in embodiment 2 of the bipolar conductive thin film connection structure according to the present invention;
fig. 9 is a schematic structural diagram of an energy storage device embodiment 3 of the bipolar conductive film connection structure according to the present invention;
fig. 10 is a schematic structural diagram of an energy storage device in embodiment 4 of the bipolar conductive film connection structure according to the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Example 1
Fig. 1 is a schematic structural diagram of an energy storage device in embodiment 1 of the bipolar conductive thin film connection structure according to the present invention. The energy storage device with the bipolar conductive film connection structure comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by a bipolar conductive film 4 which can conduct electrons and isolate conduction of ions; the energy storage unit comprises an ion membrane 1 which is electrically insulated and can conduct ions or pass through electrolyte, and a first electrode 2 and a second electrode 3 are respectively arranged on two sides of the ion membrane 1.
In two adjacent energy storage units of this embodiment, the second electrode 3 of one energy storage unit and the first electrode 2 of another energy storage unit are adjacently disposed, and the adjacent second electrode 3 and the first electrode 2 are connected by using the bipolar conductive film 4, that is, all the energy storage units of this embodiment are connected in series.
Specifically, the energy storage unit may take various forms, such as: the energy storage unit is a battery energy storage unit, and the first electrode 2 and the second electrode 3 are respectively a positive electrode and a negative electrode of the battery energy storage unit; the ionic membrane 1 is positioned between a positive electrode and a negative electrode of the same battery energy storage unit, and current collectors are respectively arranged at two ends of the energy storage equipment; or the energy storage unit is a capacitive energy storage unit, the first electrode 2 and the second electrode 3 are respectively a first capacitive electrode and a second capacitive electrode of the capacitive energy storage unit, and the ionic membrane 1 is positioned between the first capacitive electrode and the second capacitive electrode belonging to the same capacitive energy storage unit; certainly, the capacitive energy storage unit may also adopt various structural forms, when the first capacitive electrode and the second capacitive electrode are made of the same capacitive electrode material, the capacitive energy storage unit at this time is a symmetric capacitor, and when the first capacitive electrode and the second capacitive electrode are made of different capacitive electrode materials, the capacitive energy storage unit at this time is an asymmetric capacitor; or, the energy storage unit is a hybrid energy storage unit, the first electrode 2 is made of a battery anode material or a battery cathode material, and the second electrode 3 is made of a capacitor electrode material; or the first electrode 1 is made of a capacitance electrode material, and the second electrode 3 is made of a battery anode material or a battery cathode material, so that the technical purpose of energy storage can be realized.
Further, the thickness of the ion membrane 1 is 1nm or more, the thickness of the first electrode 2 is 1nm or more, and the thickness of the second electrode 3 is 1nm or more.
Further, the bipolar conductive film of the present embodiment is coated on the side of the corresponding first electrode 2 or second electrode 3. In two adjacent battery energy storage units, a bipolar conductive film 1 is arranged on the first electrode 2 of one battery energy storage unit and/or the second electrode 3 of the other adjacent battery energy storage unit. In the embodiment, the bipolar conductive film 1 is coated on the bipolar conductive film 1 on the first electrode 2 of one battery energy storage unit and the second electrode 3 of the other adjacent energy storage battery unit, so that the conductive connection performance between the energy storage units can be effectively enhanced, and the resistance and the heating are reduced. Of course, the technical purpose of achieving electronic conduction but not ionic conduction between the adjacent first electrode 2 and second electrode 3 can be achieved by only arranging the bipolar conductive film 1 on the first electrode 2 of one of the battery energy storage units or on the second electrode 3 of the other adjacent battery energy storage unit, and the description is not repeated.
Of course, the bipolar conductive film 4 can also be implemented in other configurations, as shown in fig. 2. For example, the bipolar conductive film comprises a substrate 4a, two sides of the substrate 4a are respectively provided with a conductive layer 4b, and the two conductive layers 4b are electrically connected with each other, as shown in fig. 3; or the base 4a is filled with the conductive material 4d, and the conductive material 4d is exposed from the two side surfaces of the base 4a, as shown in fig. 4. Specifically, the substrate 4a is made of a metal foil or a non-metal thin film. Metal foils include, but are not limited to, copper foil, aluminum foil, or steel foil; non-metallic films include, but are not limited to, polymers, carbon fibers, or graphene. The base body 4a can also be realized in different configurations, such as: hollow holes 4c are formed in the matrix 4a in an array mode, the conductive layers 4b positioned on two sides of the matrix 4a are filled with materials to realize conductive connection, and certainly, the technical purpose of conductivity can also be realized by filling the conductive materials in the hollow holes 4 c; the substrate 4a may also be a mesh metal foil or a mesh non-metal film, the conductive layers 4b located on both sides of the substrate 4a are filled with the mesh space of the mesh metal foil or the mesh non-metal film to realize conductive connection, and of course, the mesh space of the substrate 4a is filled with the conductive material to realize the technical purpose of conductivity. The reticular metal foil can adopt reticular copper foil, and the reticular non-metal film can adopt reticular carbon fiber. In this example, the thickness of the base material 4a is 1nm or more, and the thickness of the conductive layer 4b is 0.5nm or more. Of course, the bipolar conductive film can also be made of a film that can conduct electrons but insulate ions from conducting, and will not be described again.
Further, the bipolar conductive thin film 1 of the present embodiment is made of, but not limited to, carbon, graphite, graphene, or a metal film, and the thickness of the bipolar conductive thin film 1 is greater than or equal to 1 nm. The bipolar conductive film 1 of the present embodiment is made of graphene.
Specifically, the energy storage unit may also adopt various structures, such as: an ionic membrane 1 and a first electrode 2 belonging to the same energy storage unit are arranged into a whole, as shown in fig. 5; or the ionic membrane 1 and the second electrode 3 belonging to the same energy storage unit are arranged into a whole, as shown in fig. 6; or the first electrode 2, the ionic membrane 1 and the second electrode 3 belonging to the same energy storage unit are arranged into a whole, as shown in fig. 7. Through the structure of adopting the integral type, can effectively simplify the assembly structure of energy storage unit.
The energy storage device of bipolar conductive film connection structure of this embodiment is through setting up a plurality of energy storage units to the first electrode that will belong to two energy storage units respectively and the adjacent setting of second electrode, so, when setting up bipolar conductive film between the first electrode of these two adjacent energy storage units and second electrode, can be in the same place two adjacent energy storage units establish ties, so, can be with all energy storage unit series connections that set gradually, effectively improve output voltage.
Example 2
Fig. 8 is a schematic structural diagram of an energy storage device in embodiment 2 of the bipolar conductive thin film connection structure according to the present invention. The energy storage device with the bipolar conductive film connection structure comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by a bipolar conductive film 4 which can conduct electrons and isolate conduction of ions; the energy storage unit comprises an ion membrane 1 which is electrically insulated and can conduct ions or pass through electrolyte, and a first electrode 2 and a second electrode 3 are respectively arranged on two sides of the ion membrane 1.
When the first electrode 2 of one energy storage unit and the first electrode 2 of the other energy storage unit are adjacently arranged in two adjacent energy storage units, a bipolar conductive film 4 is arranged between the two adjacent first electrodes 2 for connection; or in two adjacent energy storage units, when the second electrode 3 of one energy storage unit is adjacently arranged with the second electrode 3 of the other energy storage unit, and the bipolar conductive film 4 is arranged between the two adjacent second electrodes 3 for connection. Of all the bipolar conductive films 4, the bipolar conductive films 4 between two adjacent first electrodes 2 are electrically connected by an external circuit or an internal circuit, and the bipolar conductive films 4 between two adjacent second electrodes 3 are electrically connected by an external circuit or an internal circuit. I.e. all energy storage units of the present embodiment are connected in parallel.
Specifically, the energy storage unit may take various forms, such as: the energy storage unit is a battery energy storage unit, and the first electrode 2 and the second electrode 3 are respectively a positive electrode and a negative electrode of the battery energy storage unit; the ionic membrane 1 is positioned between a positive electrode and a negative electrode which belong to the same battery energy storage unit; or the energy storage unit is a capacitive energy storage unit, the first electrode 2 and the second electrode 3 are respectively a first capacitive electrode and a second capacitive electrode of the capacitive energy storage unit, and the ionic membrane 1 is positioned between the first capacitive electrode and the second capacitive electrode belonging to the same capacitive energy storage unit; certainly, the capacitive energy storage unit may also adopt various structural forms, when the first capacitive electrode and the second capacitive electrode are made of the same capacitive electrode material, the capacitive energy storage unit at this time is a symmetric capacitor, and when the first capacitive electrode and the second capacitive electrode are made of different capacitive electrode materials, the capacitive energy storage unit at this time is an asymmetric capacitor; or, the energy storage unit is a hybrid energy storage unit, the first electrode 2 is made of a battery anode material or a battery cathode material, and the second electrode 3 is made of a capacitor electrode material; or the first electrode 1 is made of a capacitance electrode material, and the second electrode 3 is made of a battery anode material or a battery cathode material, so that the technical purpose of energy storage can be realized.
Furthermore, the thickness of the ion membrane 1 is more than or equal to 1nm, the thickness of the first electrode 2 is more than or equal to 1nm, and the thickness of the second electrode 3 is more than or equal to 1nm, so that the volume can be effectively reduced.
The bipolar conductive film of the present embodiment includes a substrate 4a, two conductive layers 4b are respectively disposed on two sides of the substrate 4a, and the two conductive layers 4b are electrically connected with each other, as shown in fig. 3; or the base 4a is filled with the conductive material 4d, and the conductive material 4d is exposed from the two side surfaces of the base 4a, as shown in fig. 4. Specifically, the substrate 4a is made of a metal foil or a non-metal thin film. Metal foils include, but are not limited to, copper foil, aluminum foil, or steel foil; non-metallic films include, but are not limited to, polymers, carbon fibers, or graphene. The base body 4a can also be realized in different configurations, such as: hollow holes 4c are formed in the matrix 4a in an array mode, the conductive layers 4b positioned on two sides of the matrix 4a are filled with materials to realize conductive connection, and certainly, the technical purpose of conductivity can also be realized by filling the conductive materials in the hollow holes 4 c; the substrate 4a may also be a mesh metal foil or a mesh non-metal film, the conductive layers 4b located on both sides of the substrate 4a are filled with the mesh space of the mesh metal foil or the mesh non-metal film to realize conductive connection, and of course, the mesh space of the substrate 4a is filled with the conductive material to realize the technical purpose of conductivity. The reticular metal foil can adopt reticular copper foil, and the reticular non-metal film can adopt reticular carbon fiber.
In this embodiment, the thickness of the base material 4a is 1nm or more, and the thickness of the conductive layer 4b is 1nm or more. The bipolar conductive film 4 of the present embodiment is provided with tabs 5 at its ends for facilitating external connection to other circuits or installation of internal circuits. The arrangement modes of the lugs 5 are various, and when the base body 4a is made of a conductive material, the lugs 5 are arranged at the end part of the base body 4 a; when the base 4a is made of non-metal material, the end of the base 4a needs to be provided with a U-shaped tab embedded thereon, and two ends of the U-shaped tab are respectively connected with the conductive layer 4b or the conductive material 4d on two sides of the base 4a in a conductive manner. The conductive layer 4b or the conductive material 4d is made of, but not limited to, carbon, graphite, or graphene.
Of course, the bipolar conductive film can also be made of a film that can conduct electrons but insulate ions from conducting, and will not be described again.
Specifically, the energy storage unit may also adopt various structures, such as: an ionic membrane 1 and a first electrode 2 which belong to the same energy storage unit are arranged into a whole; or the ionic membrane 1 and the second electrode 3 which belong to the same energy storage unit are arranged into a whole; or the first electrode 2, the ionic membrane 1 and the second electrode 3 which belong to the same energy storage unit are arranged into a whole. The structural form of the energy storage unit is the same as that of embodiment 1, and the description is not repeated. Through the structure of adopting the integral type, can effectively simplify the assembly structure of energy storage unit.
Other structures of this embodiment are the same as those of embodiment 1, and are not described in detail.
In the energy storage device with the bipolar conductive film connection structure according to the embodiment, the plurality of energy storage units are arranged, the first electrodes respectively belonging to the two energy storage units are arranged adjacently, the bipolar conductive film and the tab are arranged between the two adjacently arranged first electrodes, or the second electrodes respectively belonging to the two energy storage units are arranged adjacently, and the bipolar conductive film and the tab are arranged between the two adjacently arranged second electrodes; can be in parallel with these two adjacent energy storage units together, so, can be with all energy storage unit parallel connection that set gradually, effectively improve output current.
Example 3
Fig. 9 is a schematic structural diagram of an energy storage device in embodiment 3 of the bipolar conductive thin film connection structure according to the present invention. The energy storage device with the bipolar conductive film connection structure comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by a bipolar conductive film 4 which can conduct electrons and isolate conduction of ions; the energy storage unit comprises an ion membrane 1 which is electrically insulated and can conduct ions or pass through electrolyte, and a first electrode 2 and a second electrode 3 are respectively arranged on two sides of the ion membrane 1.
At least two adjacent energy storage units form an energy storage group, in the two adjacent energy storage units belonging to the same energy storage group, the second electrode 3 of one energy storage unit and the first electrode 2 of the other energy storage unit are adjacently arranged, and a bipolar conductive film 4 is arranged between the adjacent second electrode 3 and the first electrode 2 for connection. That is, all energy storage units belonging to the same energy storage group are connected in series in this embodiment.
In two adjacent energy storage groups, a first electrode 2 positioned at the end part of one energy storage group is arranged adjacent to a first electrode 2 positioned at the end part of the other energy storage group, or a second electrode 3 positioned at the end part of one energy storage group is arranged adjacent to a second electrode 3 positioned at the end part of the other energy storage group, and the bipolar conductive film is connected between the two adjacent first electrodes 2 or between the two adjacent second electrodes 3 by adopting a first conductive body capable of conducting electrons and insulating ionic conduction; in all the bipolar conductive film first conductors positioned between the energy storage groups, the first conductor bipolar conductive films positioned between two adjacent first electrodes 2 are in conductive connection by adopting an external circuit or an internal circuit, and the first conductor bipolar conductive films positioned between two adjacent second electrodes 3 are in conductive connection by adopting an external circuit or an internal circuit. The energy storage groups are connected in parallel, and the energy storage units which are connected in series and belong to one energy storage group are combined, so that the parallel-serial connection among all the energy storage units can be realized, and the required voltage and current can be output. The energy storage device of the bipolar conductive thin film connection structure of the embodiment includes 3 energy storage groups, and each energy storage group is provided with 4 energy storage units.
In this embodiment, the bipolar conductive thin film between two adjacent energy storage units belonging to the same energy storage group is coated on the side surface of the corresponding first electrode 2 or second electrode 3. In two adjacent battery energy storage units, a bipolar conductive film 1 is arranged on the first electrode 2 of one battery energy storage unit and/or the second electrode 3 of the other adjacent battery energy storage unit. In the embodiment, the bipolar conductive film 1 is coated on the bipolar conductive film 1 on the first electrode 2 of one battery energy storage unit and the second electrode 3 of the other adjacent energy storage battery unit, so that the conductive connection performance between the energy storage units can be effectively enhanced, and the resistance and the heating are reduced.
The first conductor of this embodiment is a bipolar conductive thin film, but of course, the first conductor may be implemented by other conductors that can satisfy the requirement of electron conduction but isolate ions. The bipolar conductive film 4 between the adjacent energy storage groups comprises a substrate 4a, two sides of the substrate 4a are respectively provided with a conductive layer 4b, and the two conductive layers 4b are in conductive connection; or the base 4a is filled with the conductive material 4d, and the conductive material 4d is exposed from the two side surfaces of the base 4 a. Specifically, the substrate 4a is made of a metal foil or a non-metal thin film. Metal foils include, but are not limited to, copper foil, aluminum foil, or steel foil; non-metallic films include, but are not limited to, polymers, carbon fibers, graphene. The base body 4a can also be realized in different configurations, such as: hollow holes 4c are formed in the matrix 4a in an array mode, the conductive layers 4b positioned on two sides of the matrix 4a are filled with materials to realize conductive connection, and certainly, the technical purpose of conductivity can also be realized by filling the conductive materials in the hollow holes 4 c; the substrate 4a may also be a mesh metal foil or a mesh non-metal film, the conductive layers 4b located on both sides of the substrate 4a are filled with the mesh space of the mesh metal foil or the mesh non-metal film to realize conductive connection, and of course, the mesh space of the substrate 4a is filled with the conductive material to realize the technical purpose of conductivity. The reticular metal foil can adopt reticular copper foil, and the reticular non-metal film can adopt reticular carbon fiber. In this example, the thickness of the base material 4a is 1nm or more and the thickness of the conductive layer 4b is 0.5nm or more.
Certainly, the bipolar conductive film 4 between adjacent energy storage groups may also be coated on the corresponding first electrode 2 or second electrode 3, that is, in two adjacent energy storage units of the adjacent energy storage groups, the bipolar conductive film 4 is provided on the first electrode 2 of one battery energy storage unit and/or the first electrode 2 of another battery energy storage unit adjacent thereto; or the second electrode 3 of one of the battery energy storage units and/or the second electrode 3 of the other battery energy storage unit adjacent to the second electrode are/is provided with the bipolar conductive film 4, which will not be described in detail.
Specifically, the number of the energy storage units included in all the energy storage groups of this embodiment is equal, so that the output voltages of all the energy storage groups are equal.
Other structures of this embodiment can refer to embodiment 1 and embodiment 2, and are not described in detail.
Example 4
Fig. 10 is a schematic structural diagram of an energy storage device in accordance with embodiment 4 of the bipolar conductive thin film connection structure of the present invention. The energy storage device with the bipolar conductive film connection structure comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by a bipolar conductive film 4 which can conduct electrons and isolate conduction of ions; the energy storage unit comprises an ion membrane 1 which is electrically insulated and can conduct ions or pass through electrolyte, and a first electrode 2 and a second electrode 3 are respectively arranged on two sides of the ion membrane 1.
At least two adjacent energy storage units form an energy storage group, in the two adjacent energy storage units belonging to the same energy storage group, the second electrode 3 of one energy storage unit and the second electrode 3 of the other energy storage unit are adjacently arranged, or the first electrode 2 of one energy storage unit and the first electrode 2 of the other energy storage unit are adjacently arranged, and a bipolar conductive film 4 is arranged between the adjacent second electrode 3 and the first electrode 1 for connection. In all the bipolar conductive thin films 4 in the same energy storage group, the bipolar conductive thin films 4 between two adjacent first electrodes 2 are in conductive connection by adopting an external circuit or an internal circuit, and the bipolar conductive thin films 4 between two adjacent second electrodes 3 are in conductive connection by adopting an external circuit or an internal circuit. That is, all the energy storage units belonging to the same energy storage group are connected in parallel in this embodiment.
In two adjacent energy storage groups, the first electrode 2 at the end of one energy storage group is adjacent to the second electrode 3 at the end of the other energy storage group, and the adjacent first electrode 2 and the second electrode 3 are connected by adopting a second electric conductor which can conduct electrons and insulate ions from conducting electricity. That is, the energy storage groups of the embodiment are connected in series, and the energy storage units connected in parallel inside the energy storage groups are combined, so that the series-parallel connection among all the energy storage units can be realized, and the required voltage and current can be output. The energy storage group of this embodiment sets up 3, is equipped with 4 energy storage units in each energy storage group.
In this embodiment, the bipolar conductive film between two adjacent energy storage units belonging to the same energy storage group includes a substrate 4a, two sides of the substrate 4a are respectively provided with a conductive layer 4b, and the two conductive layers 4b are conductively connected; or the base 4a is filled with the conductive material 4d, and the conductive material 4d is exposed from the two side surfaces of the base 4 a. Specifically, the substrate 4a is made of a metal foil or a non-metal thin film. Metal foils include, but are not limited to, copper foil, aluminum foil, or steel foil; non-metallic films include, but are not limited to, polymers, carbon fibers, graphene. The base body 4a can also be realized in different configurations, such as: hollow holes 4c are formed in the matrix 4a in an array mode, the conductive layers 4b positioned on two sides of the matrix 4a are filled with materials to realize conductive connection, and certainly, the technical purpose of conductivity can also be realized by filling the conductive materials in the hollow holes 4 c; the substrate 4a may also be a mesh metal foil or a mesh non-metal film, the conductive layers 4b located on both sides of the substrate 4a are filled with the mesh space of the mesh metal foil or the mesh non-metal film to realize conductive connection, and of course, the mesh space of the substrate 4a is filled with the conductive material to realize the technical purpose of conductivity. The reticular metal foil can adopt reticular copper foil, and the reticular non-metal film can adopt reticular carbon fiber. In this example, the thickness of the base material 4a is 1nm or more and the thickness of the conductive layer 4b is 0.5nm or more.
The second conductor of this embodiment adopts bipolar conductive film, and of course, first conductor also can adopt other can satisfy the electrically conductive but isolated ionic conductor realization of electron, and is special, when energy storage group is bulky, can adopt two energy storage groups of traditional conductor connection. The bipolar conductive film 4 between adjacent energy storage groups is coated on the side of the corresponding first electrode 2 or second electrode 3. In two adjacent battery energy storage units, a bipolar conductive film 1 is arranged on the first electrode 2 of one battery energy storage unit and/or the second electrode 3 of the other adjacent battery energy storage unit. In the embodiment, the bipolar conductive film 1 is coated on the bipolar conductive film 1 on the first electrode 2 of one battery energy storage unit and the second electrode 3 of the other adjacent energy storage battery unit, so that the conductive connection performance between the energy storage units can be effectively enhanced, and the resistance and the heating are reduced.
Certainly, the bipolar conductive film 4 between two adjacent energy storage units belonging to the same energy storage group may also be coated on the corresponding first electrode 2 or second electrode 3, that is, in the adjacent energy storage units, the bipolar conductive film 4 is provided on the first electrode 2 of one of the battery energy storage units and/or the first electrode 2 of the other battery energy storage unit adjacent thereto; or the second electrode 3 of one of the battery energy storage units and/or the second electrode 3 of the other battery energy storage unit adjacent to the second electrode are/is provided with the bipolar conductive film 4, which will not be described in detail.
Specifically, the number of the energy storage units included in all the energy storage groups of this embodiment is equal, so that the output currents of all the energy storage groups are equal.
Other structures of this embodiment can refer to embodiment 1 and embodiment 2, and are not described in detail.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (23)

1. An energy storage device of a bipolar conductive film connection structure, characterized in that: the energy storage device comprises energy storage units which are arranged in sequence, wherein two adjacent energy storage units are connected by adopting a bipolar conductive film which can conduct electrons and isolate ion conduction; the energy storage unit comprises an ion membrane which is electronically insulated and can be subjected to ion conduction or electrolyte penetration, and a first electrode and a second electrode are respectively arranged on two sides of the ion membrane;
in two adjacent energy storage units, the second electrode of one energy storage unit is adjacent to the first electrode of the other energy storage unit, and the adjacent second electrode and the adjacent first electrode are connected by adopting the bipolar conductive film; or the like, or, alternatively,
in two adjacent energy storage units, the first electrode of one energy storage unit and the first electrode of the other energy storage unit are adjacently arranged, or the second electrode of one energy storage unit and the second electrode of the other energy storage unit are adjacently arranged, and the two adjacent first electrodes or the two adjacent second electrodes are connected by adopting the bipolar conductive film; in all the bipolar conductive films, the bipolar conductive films positioned between two adjacent first electrodes are in conductive connection by adopting an external circuit or an internal circuit, and the bipolar conductive films positioned between two adjacent second electrodes are in conductive connection by adopting an external circuit or an internal circuit; or the like, or, alternatively,
the two adjacent energy storage units form an energy storage group, the second electrode of one energy storage unit and the first electrode of the other energy storage unit are adjacently arranged in the two adjacent energy storage units belonging to the same energy storage group, and the bipolar conductive film is arranged between the second electrode and the first electrode which are adjacent to each other and connected with each other; in two adjacent energy storage groups, the first electrode at one end of one energy storage group is arranged adjacent to the first electrode at the other end of the other energy storage group, or the second electrode at one end of the energy storage group is arranged adjacent to the second electrode at the other end of the energy storage group, and the bipolar conductive thin films between the two adjacent first electrodes or between the two adjacent second electrodes are connected by adopting a first electric conductor which can conduct electrons but isolate ion conduction, and all the bipolar conductive thin film first electric conductors positioned between the energy storage groups, the first conductor bipolar conductive films between two adjacent first electrodes are in conductive connection by adopting an external circuit or an internal circuit, and the first conductor bipolar conductive films between two adjacent second electrodes are in conductive connection by adopting an external circuit or an internal circuit; or the like, or, alternatively,
at least two adjacent energy storage units form an energy storage group, in two adjacent energy storage units belonging to the same energy storage group, the first electrode of one energy storage unit and the first electrode of the other energy storage unit are adjacently arranged, or the second electrode of one energy storage unit and the second electrode of the other energy storage unit are adjacently arranged, and the two adjacent first electrodes or the two adjacent second electrodes are connected by adopting the bipolar conductive film; in all the bipolar conductive thin films in the same energy storage group, the bipolar conductive thin films between two adjacent first electrodes are in conductive connection by adopting an external circuit or an internal circuit, and the bipolar conductive thin films between two adjacent second electrodes are in conductive connection by adopting an external circuit or an internal circuit; in two adjacent energy storage groups, a first electrode at one end of one energy storage group is adjacent to a second electrode at the other end of the other energy storage group, and a bipolar conductive film between the adjacent first electrode and the adjacent second electrode is connected by a first electric conductor capable of conducting electrons but isolating ionic conduction.
2. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the number of the energy storage units contained in all the energy storage groups is equal.
3. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the energy storage unit is a battery energy storage unit, and the first electrode and the second electrode are respectively a positive electrode and a negative electrode of the battery energy storage unit; the ionic membrane is positioned between the positive electrode and the negative electrode belonging to the same battery energy storage unit.
4. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the energy storage unit is a capacitive energy storage unit, the first electrode and the second electrode are respectively a first capacitive electrode and a second capacitive electrode of the capacitive energy storage unit, and the ionic membrane is located between the first capacitive electrode and the second capacitive electrode of the same capacitive energy storage unit.
5. The bipolar conductive thin film connection structured energy storage device according to claim 4, wherein: the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material or different capacitor electrode materials.
6. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the energy storage unit is a hybrid energy storage unit, the first electrode is made of a battery anode material or a battery cathode material, and the second electrode is made of a capacitor electrode material; or the first electrode is made of a capacitance electrode material, and the second electrode is made of a battery anode material or a battery cathode material.
7. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the thickness of the ionic membrane is greater than or equal to 1nm, the thickness of the first electrode is greater than or equal to 1nm, and the thickness of the second electrode is greater than or equal to 1 nm.
8. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the bipolar conductive film is used as the first and second conductors.
9. An energy storage device of bipolar conductive film connection structure according to any of claims 1-8, characterized in that: the bipolar conductive film is coated on the side of the corresponding first electrode or second electrode.
10. The bipolar conductive thin film connected structured energy storage device according to claim 9, wherein: the bipolar conductive film is arranged on the first electrode of one of the two adjacent battery energy storage units and/or the second electrode of the other adjacent battery energy storage unit; or the like, or, alternatively,
the bipolar conductive film is arranged on the first electrode of one of the two adjacent battery energy storage units and/or the first electrode of the other battery energy storage unit adjacent to the first electrode; or the like, or, alternatively,
and in two adjacent battery energy storage units, the second electrode of one battery energy storage unit and/or the second electrode of the other battery energy storage unit adjacent to the second electrode are/is provided with the bipolar conductive film.
11. The bipolar conductive thin film connected structured energy storage device according to claim 9, wherein: the bipolar conductive film is made of, but not limited to, carbon, graphite, graphene or metal film.
12. The bipolar conductive thin film connected structured energy storage device according to claim 11, wherein: the thickness of the bipolar conductive film is more than or equal to 1 nm.
13. The bipolar conductive thin film connected structured energy storage device according to claim 1, wherein: the ionic membrane and the first electrode which belong to the same energy storage unit are arranged into a whole; or the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole; or the first electrode, the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole.
14. An energy storage device of bipolar conductive film connection structure according to any of claims 1-8, characterized in that: the bipolar conductive film comprises a substrate, conductive layers are respectively arranged on two sides of the substrate, and the two conductive layers are in conductive connection; or, the base body is filled with a conductive material, and the conductive material is respectively exposed from the side surfaces of the two sides of the base body.
15. The bipolar conductive thin film connected structured energy storage device according to claim 14, wherein: the substrate is made of metal foil or non-metal film.
16. The bipolar conductive thin film connected structured energy storage device according to claim 15, wherein: the metal foil includes, but is not limited to, copper foil, aluminum foil, or steel foil; the non-metal film includes but is not limited to polymer, carbon fiber and graphene.
17. The bipolar conductive thin film connected structured energy storage device according to claim 14, wherein: hollow holes are formed in the base body in an array mode, and the conductive layer materials located on the two sides of the base body fill the hollow holes and achieve conductive connection; or the hollow hole is filled with the conductive material.
18. The bipolar conductive thin film connected structured energy storage device according to claim 14, wherein: : the substrate is made of a reticular metal foil or a reticular non-metal film, and the conductive layer materials positioned on two sides of the substrate fill the reticular space of the reticular metal foil or the reticular non-metal film and realize conductive connection; or the mesh-shaped space of the base body is filled with the conductive material.
19. The bipolar conductive film connection structured energy storage device according to claim 18, wherein: the reticular metal foil adopts reticular copper foil, and the reticular non-metal film adopts reticular carbon fiber.
20. The bipolar conductive thin film connected structured energy storage device according to claim 14, wherein: the thickness of the base material is more than or equal to 1nm, and the thickness of the conducting layer is more than or equal to 0.5 nm.
21. The bipolar conductive thin film connected structured energy storage device according to claim 14, wherein: and the end part of the bipolar conductive film is provided with a tab.
22. The bipolar conductive thin film connected structured energy storage device according to claim 14, wherein: the ionic membrane and the first electrode which belong to the same energy storage unit are arranged into a whole; or the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole; or the first electrode, the ionic membrane and the second electrode which belong to the same energy storage unit are arranged into a whole.
23. An energy storage device of bipolar conductive film connection structure according to any of claims 1-8, characterized in that: the bipolar conductive film is made of a film which can conduct electrons but insulate ions from conducting.
CN201910277091.6A 2019-04-08 2019-04-08 Energy storage device of bipolar conductive film connection structure Pending CN111799427A (en)

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CN201910277091.6A CN111799427A (en) 2019-04-08 2019-04-08 Energy storage device of bipolar conductive film connection structure
PCT/CN2020/083417 WO2020207362A1 (en) 2019-04-08 2020-04-06 Energy storage device having bipolar conductive film connecting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910277091.6A CN111799427A (en) 2019-04-08 2019-04-08 Energy storage device of bipolar conductive film connection structure

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CN111799427A true CN111799427A (en) 2020-10-20

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