Energy storage device with bipolar conductive film connection structure

Abstract

The application discloses a kind of bipolar conductive film connection structure's energy storage equipment, including the energy storage unit being sequentially arranged, and the bipolar conductive film of being electrically conductive but ion conduction is isolated is connected between adjacent two energy storage units;Energy storage unit includes ion membrane that is electrically insulated but ion conductive or electrolyte crossing, and first electrode and second electrode are respectively arranged on the two sides of ion membrane.The energy storage unit can realize multiple connection modes: 1) series connection: effectively improve output voltage;2) parallel connection: effectively improve output current;3) mixed connection: all energy storage units are divided into at least two energy storage groups, when the energy storage unit belonging to the same energy storage group is connected in series, the energy storage groups can be connected in parallel, realize mixed connection, can output voltage according to demand;Or, when the energy storage unit belonging to the same energy storage group is connected in parallel, the energy storage groups can be connected in series, realize mixed connection, can output current according to demand.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage devices, and particularly relates to an energy storage device with a bipolar conductive film connecting structure. BACKGROUND

[0002] The existing lithium ion battery comprises a positive electrode, a negative electrode and an ion film, and electrolyte is arranged between the positive electrode and the negative electrode. According to the charging and discharging principle of the lithium ion battery, the charging and discharging process of the lithium ion battery is the embedding and de-embedding process of lithium ions. 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 serving as the negative electrode has a layered structure and many micropores, and the lithium ions reaching the negative electrode are embedded into the micropores of the carbon layer. The more the embedded lithium ions, the higher the charging capacity. Similarly, when the battery is discharged, the lithium ions embedded in the carbon layer of the negative electrode are de-embedded and move back to the positive electrode. The more the lithium ions moving back to the positive electrode, the higher the discharging capacity.

[0003] The rated voltage of the lithium ion battery is different due to the change of materials, and is generally 3.7V (3.2V when lithium phosphate is used as the positive electrode). The terminal charging voltage when the battery is fully charged is generally 4.2V (3.65V when lithium phosphate is used as the positive electrode). When the lithium ion battery is used as a power battery, multiple lithium ion batteries are often connected in series due to the low voltage of a single lithium ion battery. Although this can meet the use requirements to a certain extent, the connected lithium ion batteries undoubtedly increase the size and weight of the battery pack. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an energy storage device with a bipolar conductive film connecting structure, which can output the required voltage as needed and has the advantages of compact structure and small size.

[0005] To achieve the above purpose, the present application provides the following technical scheme.

[0006] An energy storage device with a bipolar conductive film connecting structure comprises energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film which can conduct electrons but insulate ion conduction. The energy storage unit comprises an ion film which is electronically insulated but can conduct ions or electrolyte, and the ion film is provided with a first electrode and a second electrode on both sides.

[0007] The second electrode of one of the two adjacent energy storage units is arranged adjacent to the first electrode of the other energy storage unit, and the bipolar conductive film is arranged between the adjacent second electrode and the first electrode; or

[0008] The first electrode of one of the energy storage units is arranged adjacent to the first electrode of another of the energy storage units, or the second electrode of one of the energy storage units is arranged adjacent to the second electrode of another of the energy storage units, and the adjacent two first electrodes or the adjacent two second electrodes are connected by the bipolar conductive film; among all the bipolar conductive films, the bipolar conductive films between the adjacent two first electrodes are connected by external circuit or internal circuit, and the bipolar conductive films between the adjacent two second electrodes are connected by external circuit or internal circuit; or,

[0009] The second electrode of one of the energy storage units is arranged adjacent to the first electrode of another of the energy storage units, and the adjacent second electrode and first electrode are connected by the bipolar conductive film; among the adjacent two energy storage units of the same energy storage group, the first electrode at the end of one of the energy storage groups is arranged adjacent to the first electrode at the end of another of the energy storage groups, or the second electrode at the end of one of the energy storage groups is arranged adjacent to the second electrode at the end of another of the energy storage groups, and the adjacent two first electrodes or the adjacent two second electrodes are connected by the first conductive body which is electronically conductive but ionically insulating; among all the first conductive bodies between the energy storage groups, the first conductive bodies between the adjacent two first electrodes are connected by external circuit or internal circuit, and the first conductive bodies between the adjacent two second electrodes are connected by external circuit or internal circuit; or,

[0010] The adjacent at least two energy storage units constitute an energy storage group. In the adjacent two energy storage units belonging to the same energy storage group, one of the first electrodes of the energy storage units is adjacent to the first electrode of the other energy storage unit, or one of the second electrodes of the energy storage units is adjacent to the second electrode of the other energy storage unit. The adjacent two first electrodes or the adjacent two second electrodes are connected by the bipolar conductive film. In the same energy storage group, the bipolar conductive films between the adjacent two first electrodes are connected by an external circuit or an internal circuit, and the bipolar conductive films between the adjacent two second electrodes are connected by an external circuit or an internal circuit. In the adjacent two energy storage groups, the first electrode at the end of one of the energy storage groups is adjacent to the second electrode at the end of the other energy storage group, and the adjacent first electrode and second electrode are connected by a second conductor that can conduct electrons but is ionically insulating.

[0011] Further, the number of energy storage units contained in all the energy storage groups is equal.

[0012] Further, the energy storage unit is a battery energy storage unit, and the first electrode and the second electrode are respectively the positive electrode and the negative electrode of the battery energy storage unit. The ion film is located between the positive electrode and the negative electrode of the same battery energy storage unit.

[0013] Further, the energy storage unit is a capacitor energy storage unit, and the first electrode and the second electrode are respectively the first capacitor electrode and the second capacitor electrode of the capacitor energy storage unit. The ion film is located between the first capacitor electrode and the second capacitor electrode of the same capacitor energy storage unit.

[0014] Further, the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material or different capacitor electrode materials.

[0015] Further, the energy storage unit is a hybrid energy storage unit, the first electrode is made of a battery positive electrode material or a battery negative electrode material, and the second electrode is made of a capacitor electrode material; or, the first electrode is made of a capacitor electrode material, and the second electrode is made of a battery positive electrode material or a battery negative electrode material.

[0016] Further, the thickness of the ion film is greater than or equal to 1 nm, the thickness of the first electrode is greater than or equal to 1 nm, and the thickness of the second electrode is greater than or equal to 1 nm.

[0017] Further, the first conductor and the second conductor are the bipolar conductive film.

[0018] Further, the bipolar conductive film is coated on the side of the corresponding first electrode or second electrode.

[0019] Further, the first electrode of one of the adjacent two battery energy storage units and / or the second electrode of the other adjacent battery energy storage unit is provided with the bipolar conductive film.

[0020] Further, the first electrode of one of the adjacent two battery energy storage units and / or the first electrode of the other adjacent battery energy storage unit is provided with the bipolar conductive film.

[0021] Further, the second electrode of one of the adjacent two battery energy storage units and / or the second electrode of the other adjacent battery energy storage unit is provided with the bipolar conductive film.

[0022] Further, the bipolar conductive film is made of, but not limited to, carbon, graphite, graphene or metal film.

[0023] Further, the thickness of the bipolar conductive film is greater than or equal to 1 nm.

[0024] Further, the ion film and the first electrode of the same energy storage unit are integrated; or the ion film and the second electrode of the same energy storage unit are integrated; or the first electrode, ion film and second electrode of the same energy storage unit are integrated.

[0025] Further, the bipolar conductive film includes a substrate, both sides of the substrate are respectively provided with a conductive layer, and the two conductive layers are conductively connected; or the substrate is filled with a conductive material, and the conductive material is exposed from both sides of the substrate; or the substrate is a good conductive and ion-isolated conductive film directly used as a bipolar conductive film.

[0026] Further, the substrate is made of a metal foil or a non-metal film.

[0027] Further, the metal foil includes, but is not limited to, copper foil, aluminum foil or steel foil; and the non-metal film includes, but is not limited to, polymer, carbon fiber and graphene.

[0028] Further, the substrate is provided with an array of hollow holes, and the conductive layer material on both sides of the substrate fills the hollow holes and realizes conductive connection; or the hollow holes are filled with the conductive material.

[0029] Further, the substrate adopts a mesh metal foil or a mesh non-metal thin film, and the conductive layer material on both sides of the substrate fills the mesh space of the mesh metal foil or the mesh non-metal thin film and realizes conductive connection; or the mesh space of the substrate is filled with the conductive material.

[0030] Further, the mesh metal foil adopts a mesh copper foil, and the mesh non-metal thin film adopts a mesh carbon fiber.

[0031] Further, the thickness of the substrate is greater than or equal to 1 nm, and the thickness of the conductive layer is greater than or equal to 0.5 nm.

[0032] Further, the end of the bipolar conductive film is provided with a tab.

[0033] Further, the ion film and the first electrode belonging to the same energy storage unit are integrated; or the ion film and the second electrode belonging to the same energy storage unit are integrated; or the first electrode, the ion film and the second electrode belonging to the same energy storage unit are integrated.

[0034] Further, the bipolar conductive film is made of a film that can conduct electrons but is isolated from ion conduction.

[0035] The beneficial effects of the present application are:

[0036] The energy storage device of the bipolar conductive film connection structure of the present application can realize various connection modes between the energy storage units by arranging multiple energy storage units:

[0037] 1) Series connection: the first electrode and the second electrode belonging to two energy storage units are arranged adjacent to each other, so that when the bipolar conductive film is arranged between the first electrode and the second electrode of the two adjacent energy storage units, the two adjacent energy storage units can be connected in series, and thus all the energy storage units arranged in sequence can be connected in series, effectively improving the output voltage.

[0038] 2) Parallel connection: the first electrode belonging to two energy storage units is arranged adjacent to each other, and the bipolar conductive film and the tab are arranged between the two adjacent first electrodes; or the second electrode belonging to two energy storage units is arranged adjacent to each other, and the bipolar conductive film and the tab are arranged between the two adjacent second electrodes; thus, the two adjacent energy storage units can be connected in parallel, and thus all the energy storage units arranged in sequence can be connected in parallel, effectively improving the output current.

[0039] 3) mixed connection: all energy storage units are divided into at least two energy storage groups, 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, mixed connection is realized, and voltage output 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, mixed connection is realized, and current output can be output according to requirements;

[0040] In summary, the energy storage device with the bipolar conductive film connection structure can realize series connection, parallel connection or mixed connection, that is, the output voltage or the output current can be changed according to the use requirements, and the use is more flexible and changeable; and all the energy storage units are arranged in sequence, the packaging structure of the existing single battery is omitted, the structure is more compact, and the size is smaller and the weight is lighter. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to make the purpose, technical scheme and beneficial effects of the present application clearer, the present application provides the following drawings for illustration:

[0042] Figure 1 FIG. 1 is a structure schematic diagram of the energy storage device with the bipolar conductive film connection structure according to the present application, and specifically, the bipolar conductive film is coated on the corresponding first electrode and second electrode, and all the energy storage units are connected in series;

[0043] Figure 2 FIG. 2 is a structure schematic diagram of the energy storage device with the bipolar conductive film connection structure when the bipolar conductive film is independently arranged;

[0044] Figure 3 FIG. 3 is a structure schematic diagram of the bipolar conductive film provided with a conductive layer;

[0045] Figure 4 FIG. 4 is a structure schematic diagram of the bipolar conductive film when the conductive material is filled;

[0046] Figure 5 FIG. 5 is a structure schematic diagram of the energy storage device with the bipolar conductive film connection structure when the ion film and the first electrode are arranged as a whole;

[0047] Figure 6 FIG. 6 is a structure schematic diagram of the energy storage device with the bipolar conductive film connection structure when the ion film and the second electrode are arranged as a whole;

[0048] Figure 7 FIG. 7 is a structure schematic diagram of the energy storage device with the bipolar conductive film connection structure when the first electrode, the ion film and the second electrode are arranged as a whole;

[0049] Figure 8 FIG. 8 is a structure schematic diagram of the energy storage device with the bipolar conductive film connection structure according to the present application, and specifically, the bipolar conductive film is coated on the corresponding first electrode and second electrode, and all the energy storage units are connected in parallel;

[0050] Figure 9This is a schematic diagram of the structure of an energy storage device according to Embodiment 3 of the bipolar conductive thin film connection structure of the present invention;

[0051] Figure 10 This is a schematic diagram of the structure of an energy storage device according to Embodiment 4 of the present invention, which features a bipolar conductive thin film connection structure. Detailed Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0053] Example 1

[0054] like Figure 1 The diagram shown is a schematic representation of the structure of an energy storage device according to Embodiment 1 of the bipolar conductive thin film connection structure of the present invention. The energy storage device of this embodiment includes energy storage units arranged sequentially, with adjacent energy storage units connected by a bipolar conductive thin film 4 that allows electronic conductivity but isolates ionic conductivity. Each energy storage unit includes an ion membrane 1 that is electronically insulated but allows ionic conductivity or electrolyte passage. A first electrode 2 and a second electrode 3 are respectively provided on both sides of the ion membrane 1.

[0055] In this embodiment, in two adjacent energy storage units, the second electrode 3 of one energy storage unit is arranged adjacent to the first electrode 2 of the other energy storage unit, and a bipolar conductive film 4 is used to connect the adjacent second electrode 3 and the first electrode 2, that is, all energy storage units in this embodiment are connected in series.

[0056] Specifically, the energy storage unit can take various forms, such as: the energy storage unit is a battery energy storage unit, with the first electrode 2 and the second electrode 3 being the positive and negative electrodes of the battery energy storage unit, respectively; the ion membrane 1 is located between the positive and negative electrodes belonging to the same battery energy storage unit, and current collectors are provided at both ends of the energy storage device; or, the energy storage unit is a capacitor energy storage unit, with the first electrode 2 and the second electrode 3 being the first and second capacitor electrodes of the capacitor energy storage unit, respectively, and the ion membrane 1 being located between the first and second capacitor electrodes belonging to the same capacitor energy storage unit; of course, the capacitor energy storage unit can also take multiple forms. In one structural form, when the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material, the capacitor energy storage unit is a symmetrical capacitor; when the first capacitor electrode and the second capacitor electrode are made of different capacitor electrode materials, the capacitor energy storage unit is an asymmetrical capacitor; or, the energy storage unit is a hybrid energy storage unit, where the first electrode 2 is made of battery positive electrode material or battery negative electrode material, and the second electrode 3 is made of capacitor electrode material; or the first electrode 1 is made of capacitor electrode material, and the second electrode 3 is made of battery positive electrode material or battery negative electrode material, which can also achieve the technical purpose of energy storage.

[0057] Further, the thickness of the ion film 1 is greater than or equal to 1 nm, the thickness of the first electrode 2 is greater than or equal to 1 nm, and the thickness of the second electrode 3 is greater than or equal to 1 nm.

[0058] Further, the bipolar conductive thin film of the embodiment is coated on the side of the corresponding first electrode 2 or second electrode 3. In the adjacent two battery energy storage units, the first electrode 2 of one of the battery energy storage units and / or the second electrode 3 of the other energy storage unit adjacent thereto is provided with the bipolar conductive thin film 1. The embodiment simultaneously coats the first electrode 2 of one of the battery energy storage units and the second electrode 3 of the other energy storage unit adjacent thereto with the bipolar conductive thin film, which can effectively enhance the electronic conductive connection performance between the energy storage units, reduce the resistance and heat generation. Of course, the bipolar conductive thin film 1 is only provided on the first electrode 2 of one of the battery energy storage units or on the second electrode 3 of the other energy storage unit adjacent thereto, which can also achieve the technical purpose of realizing electronic conductive connection but not ion conductive connection between the adjacent first electrode 2 and second electrode 3, and will not be repeated.

[0059] Of course, as shown in Figure 2 , the bipolar conductive thin film 4 can also be realized in other structures. For example, the bipolar conductive thin film includes a substrate 4a, the two sides of the substrate 4a are respectively provided with a conductive layer 4b, and the two conductive layers 4b are conductively connected, as shown in Figure 3 ; or the substrate 4a is filled with a conductive material 4d, and the conductive material 4d respectively exposes from the two sides of the substrate 4a, as shown in Figure 4 . Specifically, the substrate 4a is made of metal foil or non-metal thin film. The metal foil includes but is not limited to copper foil, aluminum foil or steel foil; the non-metal thin film includes but is not limited to polymer, carbon fiber or graphene. The substrate 4a can also be realized in different structures, such as: the substrate 4a is arrayed with hollow holes 4c, the conductive layer 4b located on both sides of the substrate 4a fills the hollow holes 4c and realizes conductive connection, and of course, filling the hollow holes 4c with conductive material can also realize the technical purpose of conductive connection; the substrate 4a can also be made of mesh metal foil or mesh non-metal thin film, and the conductive layer 4b located on both sides of the substrate 4a fills the mesh space of the mesh metal foil or mesh non-metal thin film and realizes conductive connection, and of course, filling the mesh space of the substrate 4a with conductive material can also realize the technical purpose of conductive connection. The mesh metal foil can be mesh copper foil, and the mesh non-metal thin film can be mesh carbon fiber. The thickness of the substrate 4a of the embodiment is greater than or equal to 1 nm, and the thickness of the conductive layer 4b is greater than or equal to 0.5 nm. Of course, the bipolar conductive thin film can also be directly made of a thin film that can realize electronic conductive connection but isolates ion conductive connection, and will not be repeated.

[0060] Further, the bipolar conductive film 1 of the embodiment is made of, but not limited to, carbon, graphite, graphene or metal film, and the thickness of the bipolar conductive film 1 is greater than or equal to 1 nm. The bipolar conductive film 1 of the embodiment is made of graphene.

[0061] Specifically, the energy storage unit can also adopt various structures, such as: the ion film 1 and the first electrode 2 belonging to the same energy storage unit are arranged in one body, as shown in Figure 5 ; or the ion film 1 and the second electrode 3 belonging to the same energy storage unit are arranged in one body, as shown in Figure 6 ; or the first electrode 2, the ion film 1 and the second electrode 3 belonging to the same energy storage unit are arranged in one body, as shown in Figure 7 . By adopting the one-body structure, the assembly structure of the energy storage unit can be effectively simplified.

[0062] The energy storage device with the bipolar conductive film connecting structure of the embodiment is provided with a plurality of energy storage units, and the first electrode and the second electrode respectively belonging to two energy storage units are arranged adjacent to each other. Thus, when the bipolar conductive film is arranged between the first electrode and the second electrode of the adjacent two energy storage units, the adjacent two energy storage units can be connected in series. Thus, all the energy storage units arranged in sequence can be connected in series, and the output voltage can be effectively improved.

[0063] Embodiment 2

[0064] As shown in Figure 8 , it is a structure schematic diagram of the energy storage device with the bipolar conductive film connecting structure of the embodiment 2 of the application. The energy storage device with the bipolar conductive film connecting structure of the embodiment includes energy storage units arranged in sequence, and the bipolar conductive film 4 capable of conducting electrons but isolating ion conduction is arranged between the adjacent two energy storage units. The energy storage unit includes the ion film 1 capable of conducting ions or electrolyte, and the first electrode 2 and the second electrode 3 are arranged on both sides of the ion film 1.

[0065] In the adjacent two energy storage units, when the first electrode 2 of one energy storage unit is arranged adjacent to the first electrode 2 of another energy storage unit, and the bipolar conductive film 4 is arranged between the adjacent two first electrodes 2; or in the adjacent two energy storage units, when the second electrode 3 of one energy storage unit is arranged adjacent to the second electrode 3 of another energy storage unit, and the bipolar conductive film 4 is arranged between the adjacent two second electrodes 3. In all the bipolar conductive films 4, the bipolar conductive films 4 between the adjacent two first electrodes 2 are connected by external circuit or internal circuit conduction, and the bipolar conductive films 4 between the adjacent two second electrodes 3 are connected by external circuit or internal circuit conduction. That is, all the energy storage units of the embodiment are connected in parallel.

[0066] Specifically, the energy storage unit can adopt various forms, such as: the energy storage unit is a battery energy storage unit, the first electrode 2 and the second electrode 3 are respectively the positive electrode and the negative electrode of the battery energy storage unit; the ion film 1 is located between the positive electrode and the negative electrode belonging to the same battery energy storage unit; or, the energy storage unit is a capacitor energy storage unit, the first electrode 2 and the second electrode 3 are respectively the first capacitor electrode and the second capacitor electrode of the capacitor energy storage unit, and the ion film 1 is located between the first capacitor electrode and the second capacitor electrode belonging to the same capacitor energy storage unit; of course, the capacitor energy storage unit can also adopt various structural forms, when the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material, the capacitor energy storage unit at this time is a symmetric capacitor, when the first capacitor electrode and the second capacitor electrode are made of different capacitor electrode materials, the capacitor 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 battery positive electrode material or battery negative electrode material, and the second electrode 3 is made of capacitor electrode material; or the first electrode 1 is made of capacitor electrode material, and the second electrode 3 is made of battery positive electrode material or battery negative electrode material, which can also achieve the technical purpose of energy storage.

[0067] Further, the thickness of the ion film 1 is greater than or equal to 1 nm, the thickness of the first electrode 2 is greater than or equal to 1 nm, and the thickness of the second electrode 3 is greater than or equal to 1 nm, which can effectively reduce the volume.

[0068] The bipolar conductive film of the embodiment includes a substrate 4a, the two sides of the substrate 4a are respectively provided with a conductive layer 4b, and the two conductive layers 4b are conductively connected, as shown in Figure 3 ; or the substrate 4a is filled with a conductive material 4d, and the conductive material 4d respectively exposes from the two sides of the substrate 4a, as shown in Figure 4 . Specifically, the substrate 4a is made of metal foil or non-metal thin film. The metal foil includes but is not limited to copper foil, aluminum foil or steel foil; the non-metal thin film includes but is not limited to polymer, carbon fiber or graphene. The substrate 4a can also be implemented in different structures, such as: the substrate 4a is arrayed with hollow holes 4c, the conductive layer 4b located on both sides of the substrate 4a fills the hollow holes 4c and realizes conductive connection, of course, the conductive material filled in the hollow holes 4c can also realize the technical purpose of conduction; the substrate 4a can also be made of mesh metal foil or mesh non-metal thin film, and the conductive layer 4b located on both sides of the substrate 4a fills the mesh space of the mesh metal foil or mesh non-metal thin film and realizes conductive connection, of course, the conductive material filled in the mesh space of the substrate 4a can also realize the technical purpose of conduction. The mesh metal foil can be mesh copper foil, and the mesh non-metal thin film can be mesh carbon fiber.

[0069] In this embodiment, the thickness of the substrate 4a is greater than or equal to 1 nm, and the thickness of the conductive layer 4b is greater than or equal to 1 nm. The bipolar conductive film 4 in this embodiment has tabs 5 at its ends for easy connection to external circuits or for setting up internal circuits. There are various ways to set the tabs 5. When the substrate 4a is made of a conductive material, the tabs 5 can be placed at the ends of the substrate 4a. When the substrate 4a is made of a non-metallic material, U-shaped tabs embedded in it are required at the ends of the substrate 4a, with the two ends of the U-shaped tabs electrically connected to the conductive layer 4b or conductive material 4d located on both sides of the substrate 4a. The conductive layer 4b or conductive material 4d is made of, but is not limited to, carbon, graphite, or graphene.

[0070] Of course, bipolar conductive films can also be made directly from films that can conduct electricity electronically but isolate ionic conductivity, which will not be elaborated further.

[0071] Specifically, the energy storage unit can also adopt various structures, such as: integrating the ion membrane 1 and the first electrode 2 belonging to the same energy storage unit; or integrating the ion membrane 1 and the second electrode 3 belonging to the same energy storage unit; or integrating the first electrode 2, the ion membrane 1, and the second electrode 3 belonging to the same energy storage unit. The structural form of the energy storage unit is the same as that in Embodiment 1, and will not be described in detail again. By adopting an integrated structure, the assembly structure of the energy storage unit can be effectively simplified.

[0072] The other structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail hereafter.

[0073] The energy storage device with a bipolar conductive thin film connection structure in this embodiment can connect two adjacent energy storage units in parallel by setting up multiple energy storage units and placing the first electrodes of two energy storage units adjacent to each other, with a bipolar conductive film and tabs placed between the two adjacent first electrodes; or placing the second electrodes of two energy storage units adjacent to each other, with a bipolar conductive film and tabs placed between the two adjacent second electrodes. In this way, all the sequentially arranged energy storage units can be connected in parallel, effectively increasing the output current.

[0074] Example 3

[0075] like Figure 9 The diagram shown is a structural schematic of an energy storage device embodiment 3 of the bipolar conductive thin film connection structure of the present invention. The energy storage device of this embodiment with the bipolar conductive thin film connection structure includes energy storage units arranged sequentially. Adjacent energy storage units are connected by a bipolar conductive thin film 4 that allows electronic conductivity but isolates ionic conductivity. Each energy storage unit includes an ion membrane 1 that is electronically insulated but allows ionic conductivity or electrolyte passage. A first electrode 2 and a second electrode 3 are respectively provided on both sides of the ion membrane 1.

[0076] The adjacent at least two energy storage units constitute an energy storage group, and the second electrode 3 of one of the adjacent two energy storage units belonging to the same energy storage group is arranged adjacent to the first electrode 2 of the other energy storage unit, and a bipolar conductive film 4 is arranged between the adjacent second electrode 3 and the first electrode 2. That is, all the energy storage units belonging to the same energy storage group in the embodiment are connected in series.

[0077] In the adjacent two energy storage groups, the first electrode 2 at the end of one of the energy storage groups is arranged adjacent to the first electrode 2 at the end of the other energy storage group, or the second electrode 3 at the end of one of the energy storage groups is arranged adjacent to the second electrode 3 at the end of the other energy storage group, and a first conductor capable of conducting electrons but isolating ion conduction is arranged between the adjacent two first electrodes 2 or the adjacent two second electrodes 3. In all the first conductors of the bipolar conductive film between the energy storage groups, the first conductors between the adjacent two first electrodes 2 are connected by an external circuit or an internal circuit, and the first conductors between the adjacent two second electrodes 3 are connected by an external circuit or an internal circuit. That is, the energy storage groups in the embodiment are connected in parallel, and the energy storage units belonging to the same energy storage group are connected in series, so that the mixed connection between all the energy storage units can be realized, and the required voltage and current can be output. The energy storage device with the bipolar conductive film connection structure in the embodiment includes three energy storage groups, and each energy storage group includes four energy storage units.

[0078] In the embodiment, the bipolar conductive film between the adjacent two energy storage units belonging to the same energy storage group is coated on the side of the corresponding first electrode 2 or second electrode 3. In the adjacent two battery energy storage units, the first electrode 2 of one of the battery energy storage units and / or the second electrode 3 of the other energy storage unit adjacent thereto is provided with a bipolar conductive film 1. In the embodiment, the first electrode 2 of one of the battery energy storage units and the second electrode 3 of the other energy storage unit adjacent thereto are provided with a bipolar conductive film 1, and the bipolar conductive film is coated on the bipolar conductive film, which can effectively enhance the conductive connection performance between the energy storage units and reduce the resistance and heat generation.

[0079] The first conductive body of the embodiment adopts a bipolar conductive film. Of course, the first conductive body can also adopt other conductive bodies that can meet electronic conduction but isolate ions to achieve. The bipolar conductive film 4 between adjacent energy storage groups includes a substrate 4a, and the 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 substrate 4a is filled with a conductive material 4d, and the conductive material 4d is exposed from the two sides of the substrate 4a. Specifically, the substrate 4a is made of a metal foil or a non-metal film. The metal foil includes but is not limited to a copper foil, an aluminum foil or a steel foil; the non-metal film includes but is not limited to a polymer, a carbon fiber and graphene. The substrate 4a can also be realized by different structures, such as: the substrate 4a is arrayed with a hollow hole 4c, the conductive layer 4b located on the two sides of the substrate 4a fills the hollow hole 4c and realizes conductive connection, of course, the conductive material filled in the hollow hole 4c can also realize the technical purpose of conduction; the substrate 4a can also adopt a mesh metal foil or a mesh non-metal film, and the conductive layer 4b located on the two sides of the substrate 4a fills the mesh space of the mesh metal foil or the mesh non-metal film and realizes conductive connection, of course, the conductive material filled in the mesh space of the substrate 4a can also realize the technical purpose of conduction. The mesh metal foil can adopt a mesh copper foil, and the mesh non-metal film can adopt a mesh carbon fiber. The thickness of the substrate 4a of the embodiment is greater than or equal to 1 nm, and the thickness of the conductive layer 4b is greater than or equal to 0.5 nm.

[0080] Of course, the bipolar conductive film 4 between adjacent energy storage groups can also be coated on the corresponding first electrode 2 or second electrode 3, that is, at this time, in the adjacent two energy storage units of adjacent energy storage groups, the first electrode 2 of one battery energy storage unit and / or the first electrode 2 of another battery energy storage unit adjacent thereto is provided with the bipolar conductive film 4; or the second electrode 3 of one battery energy storage unit and / or the second electrode 3 of another battery energy storage unit adjacent thereto is provided with the bipolar conductive film 4, which will not be repeated.

[0081] Specifically, the number of energy storage units contained in all energy storage groups of the embodiment is equal, so that the output voltages of all energy storage groups are equal.

[0082] The other structures of the embodiment can refer to Embodiment 1 and Embodiment 2, which will not be repeated one by one.

[0083] Embodiment 4

[0084] As Figure 10Figure 4 is a structural schematic diagram of the energy storage device with the bipolar conductive film connecting structure according to the fourth embodiment of the present application. The energy storage device with the bipolar conductive film connecting structure according to the fourth embodiment of the present application comprises energy storage units arranged in sequence, and adjacent two energy storage units are connected by the bipolar conductive film 4 which is electronically conductive but ionically insulating. The energy storage unit comprises the ion film 1 which is electronically insulating but ionically conductive or electrolyte-penetrable, and the first electrode 2 and the second electrode 3 are arranged on both sides of the ion film 1 respectively.

[0085] The adjacent at least two energy storage units form an energy storage group, and the second electrode 3 of one energy storage unit and the second electrode 3 of another energy storage unit are arranged adjacently or the first electrode 2 of one energy storage unit and the first electrode 2 of another energy storage unit are arranged adjacently in the adjacent two energy storage units belonging to the same energy storage group, and the bipolar conductive film 4 is arranged between the adjacent second electrode 3 and the first electrode 1. In all the bipolar conductive films 4 in the same energy storage group, the bipolar conductive films 4 between the adjacent two first electrodes 2 are connected by the external circuit or the internal circuit, and the bipolar conductive films 4 between the adjacent two second electrodes 3 are connected by the external circuit or the internal circuit. That is, all the energy storage units in the same energy storage group are connected in parallel according to the fourth embodiment.

[0086] In the adjacent two energy storage groups, the first electrode 2 at the end of one energy storage group and the second electrode 3 at the end of another energy storage group are arranged adjacently, and the second conductive body which is electronically conductive but ionically insulating is arranged between the adjacent first electrode 2 and the second electrode 3. That is, the energy storage groups are connected in series according to the fourth embodiment, and the energy storage units in the energy storage group are connected in parallel, so that the mixed connection between all the energy storage units can be realized, and the required voltage and current can be outputted. The energy storage groups in the fourth embodiment are arranged as three, and four energy storage units are arranged in each energy storage group.

[0087] In this embodiment, the bipolar conductive film between the two adjacent energy storage units belonging to the same energy storage group includes a substrate 4a, the 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 substrate 4a is filled with a conductive material 4d, and the conductive material 4d is exposed from the two sides of the substrate 4a. Specifically, the substrate 4a is made of metal foil or non-metal film. 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. The substrate 4a can also be realized by different structures, such as: the substrate 4a is arrayed with a hollow hole 4c, the conductive layer 4b located on both sides of the substrate 4a fills the hollow hole 4c and realizes conductive connection, of course, the conductive material filled in the hollow hole 4c can also realize the technical purpose of conduction; the substrate 4a can also be made of a mesh metal foil or a mesh non-metal film, and the conductive layer 4b located on both sides of the substrate 4a fills the mesh space of the mesh metal foil or the mesh non-metal film and realizes conductive connection, of course, the mesh space of the substrate 4a filled with the conductive material can also realize the technical purpose of conduction. The mesh metal foil can be a mesh copper foil, and the mesh non-metal film can be a mesh carbon fiber. The thickness of the substrate 4a in this embodiment is greater than or equal to 1 nm, and the thickness of the conductive layer 4b is greater than or equal to 0.5 nm.

[0088] The second conductive body of this embodiment adopts a bipolar conductive film, of course, the second conductive body can also be realized by other conductive bodies that can satisfy electronic conduction but isolate ions, especially when the volume of the energy storage group is large, the traditional conductive body can be used to connect two energy storage groups. The bipolar conductive film 4 between the adjacent energy storage groups is coated on the side of the corresponding first electrode 2 or second electrode 3. In the adjacent two battery energy storage units, the first electrode 2 of one battery energy storage unit and / or the second electrode 3 of the other energy storage battery unit adjacent thereto is provided with a bipolar conductive film 1. This embodiment simultaneously provides the first electrode 2 of one battery energy storage unit and the second electrode 3 of the other energy storage battery unit adjacent thereto with a bipolar conductive film 1 coated with a bipolar conductive film, which can effectively enhance the conductive connection performance between the energy storage units and reduce the resistance and heat generation.

[0089] Of course, the bipolar conductive film 4 between the two adjacent energy storage units belonging to the same energy storage group can also be coated on the corresponding first electrode 2 or second electrode 3, that is, at this time, in the adjacent energy storage units, the first electrode 2 of one battery energy storage unit and / or the first electrode 2 of the other battery energy storage unit adjacent thereto is provided with a bipolar conductive film 4; or the second electrode 3 of one battery energy storage unit and / or the second electrode 3 of the other battery energy storage unit adjacent thereto is provided with a bipolar conductive film 4, which will not be repeated.

[0090] Specifically, the number of energy storage units contained in all the energy storage groups of the embodiment is equal, so that the output currents of all the energy storage groups are equal.

[0091] Other structures of the embodiment can refer to Embodiment 1 and Embodiment 2, and are not listed one by one.

[0092] The above-described embodiments are only preferred embodiments of the present application for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitutions or transformations made by those skilled in the art based on the present application are within the protection scope of the present application. The protection scope of the present application is subject to the claims.

Claims

1. An energy storage device of a bipolar conductive thin film connection structure, characterized by: The energy storage unit comprises an ion film which is electronically insulated but ion-conducting or electrolyte-penetrable, and first and second electrodes arranged on both sides of the ion film. The first electrodes of two adjacent energy storage units are arranged adjacently, or the second electrodes of two adjacent energy storage units are arranged adjacently, and the two adjacent first electrodes or the two adjacent second electrodes are connected by the bipolar conductive film. At least two adjacent energy storage units form an energy storage group, and the second electrode of one energy storage unit and the first electrode of another energy storage unit in the same energy storage group are arranged adjacently and connected by the bipolar conductive film. The first electrodes at the end of one energy storage group and the first electrodes at the end of another energy storage group are arranged adjacently, or the second electrodes at the end of one energy storage group and the second electrodes at the end of another energy storage group are arranged adjacently, and the two adjacent first electrodes or the two adjacent second electrodes are connected by the first conductive body which is electronically conductive but ion-insulating. The first conductive bodies between adjacent energy storage groups are connected by an external circuit or an internal circuit. The adjacent at least two energy storage units constitute an energy storage group. In the adjacent two energy storage units belonging to the same energy storage group, one of the first electrodes of the energy storage units is adjacent to the first electrode of the other energy storage unit, or one of the second electrodes of the energy storage units is adjacent to the second electrode of the other energy storage unit. The adjacent two first electrodes or the adjacent two second electrodes are connected by the bipolar conductive film. In the same energy storage group, the bipolar conductive films between the adjacent two first electrodes are connected by an external circuit or an internal circuit, and the bipolar conductive films between the adjacent two second electrodes are connected by an external circuit or an internal circuit. In the adjacent two energy storage groups, the first electrode at the end of one of the energy storage groups is adjacent to the second electrode at the end of the other energy storage group, and the adjacent first electrode and second electrode are connected by a second conductor that can conduct electrons but is ionically insulating. The bipolar conductive film is coated on the side of the corresponding first electrode or second electrode, and the bipolar conductive film is made of a film that can conduct electrons but is ionically insulating.

2. The energy storage device of claim 1, wherein: The number of energy storage units in all energy storage groups is equal.

3. The energy storage device of claim 1, wherein: The energy storage unit is a battery energy storage unit, and the first electrode and the second electrode are the positive electrode and the negative electrode of the battery energy storage unit, respectively. The ion film is located between the positive electrode and the negative electrode of the same battery energy storage unit.

4. The energy storage device of claim 1, wherein: The energy storage unit is a capacitor energy storage unit, and the first electrode and the second electrode are the first capacitor electrode and the second capacitor electrode of the capacitor energy storage unit, respectively. The ion film is located between the first capacitor electrode and the second capacitor electrode of the same capacitor energy storage unit.

5. The energy storage device of 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 energy storage device of claim 1, wherein: The energy storage unit is a hybrid energy storage unit. The first electrode is made of a battery positive electrode material or a battery negative electrode material, and the second electrode is made of a capacitor electrode material. Alternatively, the first electrode is made of a capacitor electrode material, and the second electrode is made of a battery positive electrode material or a battery negative electrode material.

7. The energy storage device of claim 1, wherein: The thickness of the ion film is greater than or equal to 1 nm, the thickness of the first electrode is greater than or equal to 1 nm, and the thickness of the second electrode is greater than or equal to 1 nm.

8. The energy storage device of claim 1, wherein: The first conductor and the second conductor are the bipolar conductive film.

9. The energy storage device of claim 3, wherein: One of the first electrode of one of the adjacent two battery energy storage units and / or the second electrode of the other of the adjacent two battery energy storage units is provided with the bipolar conductive film; or, one of the first electrode of one of the adjacent two battery energy storage units and / or the first electrode of the other of the adjacent two battery energy storage units is provided with the bipolar conductive film; or, one of the second electrode of one of the adjacent two battery energy storage units and / or the second electrode of the other of the adjacent two battery energy storage units is provided with the bipolar conductive film.

10. The energy storage device of claim 1, wherein: The bipolar conductive film is made of carbon, graphite, graphene or metal film.

11. The energy storage device of claim 10, wherein: The thickness of the bipolar conductive film is greater than or equal to 1 nm.

12. The energy storage device of claim 1, wherein: The ion film and the first electrode of the same energy storage unit are integrated; or the ion film and the second electrode of the same energy storage unit are integrated; or the first electrode, ion film and second electrode of the same energy storage unit are integrated.

13. The energy storage device of the bipolar conductive film connection structure according to any one of claims 1-8, characterized in that: The bipolar conductive film comprises a substrate, and the substrate is provided with a conductive layer on each side, and the two conductive layers are conductively connected; or the substrate is filled with a conductive material, and the conductive material is exposed from each side of the substrate.

14. The energy storage device of claim 13, wherein: The substrate is made of metal foil or non-metal film.

15. The energy storage device of claim 14, wherein: The metal foil includes copper foil, aluminum foil or steel foil; and the non-metal film includes polymer, carbon fiber and graphene.

16. The energy storage device of claim 13, wherein: The substrate is provided with a hollow hole in an array, and the conductive layer material on both sides of the substrate fills the hollow hole and realizes conductive connection; or the hollow hole is filled with the conductive material.

17. The energy storage device of claim 13, wherein: The substrate is made of mesh metal foil or mesh non-metal film, and the conductive layer material on both sides of the substrate fills the mesh space of the mesh metal foil or mesh non-metal film and realizes conductive connection; or the mesh space of the substrate is filled with the conductive material.

18. The energy storage device of claim 17, wherein: The mesh metal foil is mesh copper foil, and the mesh non-metal film is mesh carbon fiber.

19. The energy storage device of claim 13, wherein: The thickness of the substrate is greater than or equal to 1 nm, and the thickness of the conductive layer is greater than or equal to 0.5 nm.

20. The energy storage device of claim 13, wherein: The end of the bipolar conductive film is provided with a tab.

21. The energy storage device of claim 13, wherein: The ion film and the first electrode of the same energy storage unit are integrated; or the ion film and the second electrode of the same energy storage unit are integrated; or the first electrode, ion film and second electrode of the same energy storage unit are integrated.

Images