WO2020207362A1 - Energy storage device having bipolar conductive film connecting structure - Google Patents

Abstract

An energy storage device having a bipolar conductive film connecting structure. The energy storage device comprises energy storage units provided in sequence; two adjacent energy storage units are connected by adopting a bipolar conductive film (4) which can be electronically conductive but isolate ionic conduction; the energy storage unit comprises an ionic membrane (1) which is electronically insulated but can be subjected to ionic conduction or electrolyte passing through; and a first electrode (2) and a second electrode (3) are respectively provided on two sides of the ionic membrane (1). Multiple connection modes can be achieved among the energy storage units: 1) a series connection: an output voltage is effectively improved; 2) a parallel connection: an output current is effectively improved; 3) a series-parallel connection: all the 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 to achieve the series-parallel connection, and a voltage can be outputted 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 to achieve the series-parallel connection, and a current can be outputted according to requirements.

Description

Energy storage device with bipolar conductive film connection structure Technical field

The invention belongs to the technical field of energy storage equipment, and specifically is an energy storage equipment with a bipolar conductive film connection structure.

Background technique

The existing lithium ion battery includes a positive electrode, a negative electrode and an ion membrane, and an electrolyte is provided between the positive electrode and the negative electrode. According to the charging and discharging principle of lithium-ion batteries, it can be known that the charging and discharging process of lithium-ion batteries is the intercalation and deintercalation 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 as the negative electrode has a layered structure with many micropores. The lithium ions reaching the negative electrode are embedded in the micropores of the carbon layer. The more lithium ions are inserted, the higher the charging capacity. Similarly, when the battery is discharged, the lithium ions embedded in the carbon layer of the negative electrode are released 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 a lithium-ion battery varies due to changes in materials, generally 3.7V (with lithium iron phosphate as the positive electrode, 3.2V), the final charging voltage when fully charged is generally 4.2V, (with lithium iron phosphate as the positive electrode) Is 3.65V). When lithium-ion batteries are used as power batteries, it is often necessary to connect multiple lithium-ion batteries in series due to the low voltage of single-cell lithium-ion batteries. Although it can meet the requirements to a certain extent, the series-connected lithium-ion batteries will undoubtedly increase The size and weight of the large battery pack.

Summary of the invention

In view of this, the purpose of the present invention is to provide an energy storage device with a bipolar conductive film connection structure, which can output the required voltage according to needs, and has the advantages of compact structure and small size.

To achieve the above objective, the present invention provides the following technical solutions:

An energy storage device with a bipolar conductive film connection structure, comprising energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film that is electrically conductive but isolated from ion conduction; The energy unit includes an ion membrane that is electrically insulated but can be ionically conductive or electrolyte traverses, and a first electrode and a second electrode are respectively provided on both sides of the ion membrane;

Among the two adjacent energy storage units, the second electrode of one of the energy storage units and the first electrode of the other energy storage unit are adjacently arranged, and in the adjacent The second electrode and the first electrode are connected by the bipolar conductive film; or,

Among the two adjacent energy storage units, the first electrode of one of the energy storage units is adjacent to the first electrode of the other energy storage unit, or one of the energy storage units The second electrode and the second electrode of the other energy storage unit are arranged adjacently, and between the two adjacent first electrodes or between the adjacent two second electrodes The bipolar conductive films are connected; among all the bipolar conductive films, the bipolar conductive films located between two adjacent first electrodes are electrically connected by an external circuit or an internal circuit, and are located The bipolar conductive films between two adjacent second electrodes are electrically connected by an external circuit or an internal circuit; or,

At least two adjacent energy storage units constitute an energy storage group, and among the two adjacent energy storage units belonging to the same energy storage group, the second electrode of one of the energy storage units is connected to The first electrodes of the other energy storage unit are arranged adjacent to each other, and the bipolar conductive film is connected between the adjacent second electrode and the first electrode; two adjacent In the energy storage group, the first electrode located at the end of one of the energy storage groups is adjacent to the first electrode located at the end of the other energy storage group, or is located at one of the The second electrode at the end of the energy storage group is arranged adjacent to the second electrode at the end of the other energy storage group, and is located between or adjacent to the two adjacent first electrodes The two second electrodes are connected by a first electrical conductor that can conduct electrons but isolate ion conduction. Among all the first electrical conductors located between the energy storage groups, they are located in the two adjacent ones. The first conductors between the first electrodes are electrically connected by an external circuit or an internal circuit, and the first conductors between two adjacent second electrodes are connected by an external circuit or an internal circuit. The electrical circuit is connected; or,

At least two adjacent energy storage units constitute an energy storage group, and among the two adjacent energy storage units belonging to the same energy storage group, the first electrode of one of the energy storage units is connected to The first electrodes of the other energy storage unit are arranged adjacent to each other, or the second electrode of one of the energy storage units is arranged adjacent to the second electrode of the other energy storage unit, the Two adjacent first electrodes or two adjacent second electrodes are connected by the bipolar conductive film; all the bipolar conductive films located in the same energy storage group Wherein, the bipolar conductive films located between the two adjacent first electrodes are electrically connected by an external circuit or an internal circuit, and the bipolar conductive films located between the two adjacent second electrodes The polar conductive films are electrically connected by an external circuit or an internal circuit; in two adjacent energy storage groups, the first electrode at the end of one of the energy storage groups and the end of the other energy storage group The second electrodes are arranged adjacent to each other, and are connected between the adjacent first electrode and the second electrode by using a second electrical conductor that can conduct electricity but isolates ion conduction.

Further, the number of the energy storage units included in all the energy storage groups is equal.

Further, the energy storage unit is a battery energy storage unit, the first electrode and the second electrode are respectively the positive electrode and the negative electrode of the battery energy storage unit; the ion membrane is located in the same battery energy storage unit. Between the positive electrode and the negative electrode of the cell.

Further, the energy storage unit is a capacitive energy storage unit, the first electrode and the second electrode are respectively the first capacitive electrode and the second capacitive electrode of the capacitive energy storage unit, and the ion membrane is located in the same place. Between the first capacitor electrode and the second capacitor electrode of the capacitor energy storage unit.

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

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

Further, the thickness of the ion membrane 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.

Further, the first electrical conductor and the second electrical conductor use the bipolar conductive film.

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

Further, in two adjacent battery energy storage units, the first electrode of one of the battery energy storage units and/or the second electrode of the other adjacent battery energy storage unit Provided with the bipolar conductive film; or,

In two adjacent battery energy storage units, the first electrode of one of the battery energy storage units and/or the first electrode of the other adjacent battery energy storage unit is provided with The bipolar conductive film; or,

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

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

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

Further, the ion membranes belonging to the same energy storage unit are integrated with the first electrode; or the ion membranes belonging to the same energy storage unit are integrated with the second electrode; or The first electrode, the ion membrane and the second electrode belonging to the same energy storage unit are arranged as a whole.

Further, the bipolar conductive film includes a substrate, and conductive layers are respectively provided on both sides of the substrate, and the two conductive layers are conductively connected; or, the substrate is filled with conductive material, and the conductive material Respectively exposed from both sides of the substrate; or, the substrate is a conductive film with good conductivity and ion isolation directly used as a bipolar conductive film.

Further, the substrate is made of metal foil or non-metal film.

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

Further, the matrix is provided with hollow holes in an array, 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.

Further, the substrate adopts a mesh metal foil or a mesh non-metal film, and the conductive layer materials located on both sides of the substrate fill the mesh space of the mesh metal foil or the mesh non-metal film and realize Conductive connection; or the network space of the base is filled with the conductive material.

Further, the mesh-shaped metal foil is a mesh-shaped copper foil, and the mesh-shaped non-metallic film is a mesh-shaped carbon fiber.

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.

Further, the ends of the bipolar conductive film are provided with tabs.

Further, the ion membranes belonging to the same energy storage unit are integrated with the first electrode; or the ion membranes belonging to the same energy storage unit are integrated with the second electrode; or The first electrode, the ion membrane and the second electrode belonging to the same energy storage unit are arranged as a whole.

Further, the bipolar conductive film is made of a film that can conduct electricity but isolates ion conduction.

The beneficial effects of the present invention are:

In the energy storage device with the bipolar conductive film connection structure of the present invention, by arranging multiple energy storage units, multiple connection modes can be realized between the energy storage units:

1) Series connection: the first electrode and the second electrode belonging to two energy storage units are arranged adjacently, so when a bipolar is arranged between the first electrode and the second electrode of the two adjacent energy storage units When the conductive film is used, the two adjacent energy storage units can be connected in series, so that all the energy storage units arranged in sequence can be connected in series to effectively increase the output voltage;

2) Parallel connection: the first electrodes that belong to two energy storage units are arranged adjacently, and a bipolar conductive film and tabs are arranged between the two adjacently arranged first electrodes, or they belong to two The second electrodes of two energy storage units are arranged adjacently, and a bipolar conductive film and tabs are arranged between the two adjacently arranged second electrodes; that is, the two adjacent energy storage units are connected in parallel At the same time, in this way, all the energy storage units arranged in sequence can be connected in parallel to effectively increase the output current;

3) Hybrid connection: Divide all energy storage units 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 to achieve hybrid connection , Can output voltage according to demand; or, when energy storage units belonging to the same energy storage group are connected in parallel, the energy storage groups can be connected in series to achieve hybrid connection, and can output current according to demand;

In summary, the energy storage device with the bipolar conductive film connection structure of the present invention can realize series, parallel or hybrid connection, and can change the output voltage or output current according to the needs of use, and the use is more flexible and changeable; and all the energy storage units are sequentially The arrangement arrangement eliminates the need for the packaging structure of the existing single battery, the structure is more compact, the size is smaller, and the weight is lighter.

Description of the drawings

In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

1 is a schematic structural diagram of Embodiment 1 of an energy storage device with a bipolar conductive film connection structure according to the present invention. Specifically, the bipolar conductive film of this embodiment is coated on the corresponding first electrode and the second electrode, and all the storage Series connection between energy units;

FIG. 2 is a schematic structural diagram of an energy storage device with a bipolar conductive film connection structure when the bipolar conductive film is independently arranged;

Figure 3 is a schematic view of the structure of a bipolar conductive film provided with a conductive layer;

4 is a schematic diagram of the structure of the bipolar conductive film when filled with conductive material;

FIG. 5 is a schematic structural diagram of an energy storage device with a bipolar conductive film connection structure when the ion membrane and the first electrode are integrated;

6 is a schematic diagram of the structure of the energy storage device of the bipolar conductive film connection structure when the ion membrane and the second electrode are integrated;

FIG. 7 is a schematic structural diagram of an energy storage device with a bipolar conductive film connection structure when the first electrode, the ion membrane, and the second electrode are integrated;

8 is a schematic structural diagram of Embodiment 2 of an energy storage device with a bipolar conductive film connection structure according to the present invention;

9 is a schematic structural diagram of Embodiment 3 of an energy storage device with a bipolar conductive film connection structure according to the present invention;

10 is a schematic structural diagram of Embodiment 4 of an energy storage device with a bipolar conductive film connection structure of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention, but the examples cited are not intended to limit the present invention.

Example 1

As shown in FIG. 1, it is a schematic structural diagram of Embodiment 1 of an energy storage device with a bipolar conductive film connection structure of the present invention. The energy storage device of the bipolar conductive film connection structure of this embodiment includes energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film 4 that can conduct electrons but isolate ion conduction; The unit includes an ion membrane 1 that is electrically insulated but can be ionically conducted or electrolyte traversed. A first electrode 2 and a second electrode 3 are provided on both sides of the ion membrane 1 respectively.

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

Specifically, the energy storage unit can take many forms, such as: the energy storage unit is a battery energy storage unit, the first electrode 2 and the second electrode 3 are the positive electrode and the negative electrode of the battery energy storage unit, respectively; the ion membrane 1 is located in Between the positive electrode and the negative electrode of the same battery energy storage unit, the two ends of the energy storage device are respectively provided with current collectors; or, the energy storage unit is a capacitive energy storage unit, and the first electrode 2 and the second electrode 3 are respectively Are the first capacitor electrode and the second capacitor electrode of the capacitor energy storage unit, and the ion membrane 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 use multiple capacitor electrodes. In this structure, when the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material, the capacitive energy storage unit at this time is a symmetrical capacitor. When the first capacitor electrode and the second capacitor electrode use different capacitors When the electrode material is made, 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 battery anode material or battery anode material, and the second electrode 3 is made of The capacitor electrode material is made; 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.

Further, the thickness of the ion membrane 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.

Further, the bipolar conductive film of this embodiment is coated on the side surface of the corresponding first electrode 2 or second electrode 3. Among two adjacent battery energy storage units, a bipolar conductive film 1 is provided 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 this embodiment, the first electrode 2 of one of the battery energy storage units and the second electrode 3 of the other battery energy storage unit adjacent to it are coated with a bipolar conductive film, which can effectively enhance the gap between the energy storage units. The conductive connection performance reduces resistance and heat generation. Of course, only the first electrode 2 of one of the battery energy storage units or the second electrode 3 of another battery energy storage unit adjacent to the bipolar conductive film 1 can also be implemented on the adjacent first electrode 2 The technical purpose of achieving electronic conduction between the electrode 2 and the second electrode 3 but not achieving ion conduction is not repeated here.

Of course, as shown in FIG. 2, the bipolar conductive film 4 can also be implemented with other structures. For example, the bipolar conductive film includes a base 4a, the two sides of the base 4a are provided with conductive layers 4b, and the two conductive layers 4b are electrically connected, as shown in Figure 3; or the base 4a is filled with conductive material 4d, conductive material 4d are respectively exposed from both sides of the base 4a, as shown in FIG. 4. Specifically, the base 4a is made of metal foil or non-metallic 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 fiber or graphene. The base 4a can also be implemented in different structures. For example, the base 4a is provided with hollow holes 4c in an array, and the conductive layers 4b located on both sides of the base 4a fill the hollow holes 4c and realize conductive connection. Of course, the hollow holes 4c are filled with Conductive materials can also achieve the technical purpose of conduction; the base 4a can also use mesh metal foil or mesh non-metallic film, and the conductive layer 4b on both sides of the base 4a is filled with mesh metal foil or mesh non-metallic film Of course, the mesh space of the base 4a can be filled with conductive materials to achieve the technical purpose of conductivity. The mesh metal foil can be a mesh copper foil, and the mesh non-metal film can be a mesh carbon fiber. In this embodiment, the thickness of the substrate 4a is 1 nm or more, and the thickness of the conductive layer 4b is 0.5 nm or more. Of course, the bipolar conductive film can also be directly made of a film that can conduct electronically but isolates ion conduction, and will not be repeated.

Furthermore, the bipolar conductive film 1 of this embodiment is made of, but not limited to, carbon, graphite, graphene, or a 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 this embodiment is made of graphene.

Specifically, the energy storage unit can also adopt a variety of structures, such as: the ion membrane 1 and the first electrode 2 belonging to the same energy storage unit are integrated, as shown in FIG. 5; The ion membrane 1 and the second electrode 3 are integrated as shown in FIG. 6; or the first electrode 2, the ion membrane 1 and the second electrode 3 belonging to the same energy storage unit are integrated as shown in FIG. By adopting an integrated structure, the assembly structure of the energy storage unit can be effectively simplified.

In the energy storage device of the bipolar conductive film connection structure of this embodiment, multiple energy storage units are arranged, and the first electrode and the second electrode belonging to the two energy storage units are arranged adjacently. When a bipolar conductive film is arranged between the first electrode and the second electrode of two adjacent energy storage units, the two adjacent energy storage units can be connected in series, so that all the energy storage units arranged in sequence can be connected in series. The units are connected in series to effectively increase the output voltage.

Example 2

As shown in FIG. 8, it is a schematic structural diagram of Embodiment 2 of an energy storage device with a bipolar conductive film connection structure of the present invention. The energy storage device of the bipolar conductive film connection structure of this embodiment includes energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film 4 that can conduct electrons but isolate ion conduction; The unit includes an ion membrane 1 that is electrically insulated but can be ionically conducted or electrolyte traversed. A first electrode 2 and a second electrode 3 are provided on both sides of the ion membrane 1 respectively.

In two adjacent energy storage units, when the first electrode 2 of one of the energy storage units and the first electrode 2 of the other energy storage unit are arranged adjacently, the two adjacent first electrodes 2 There is a bipolar conductive film 4 connected between them; or in two adjacent energy storage units, when the second electrode 3 of one energy storage unit is adjacent to the second electrode 3 of the other energy storage unit, and A bipolar conductive film 4 is connected between the two adjacent second electrodes 3. Among all the bipolar conductive films 4, the bipolar conductive films 4 located between two adjacent first electrodes 2 are electrically connected by an external circuit or an internal circuit, and are located between two adjacent second electrodes 3 The bipolar conductive films 4 are electrically connected by an external circuit or an internal circuit. That is, all the energy storage units in this embodiment are connected in parallel.

Specifically, the energy storage unit can take many forms, such as: the energy storage unit is a battery energy storage unit, the first electrode 2 and the second electrode 3 are the positive electrode and the negative electrode of the battery energy storage unit, respectively; the ion membrane 1 is located in Between the positive electrode and the negative electrode of the same battery energy storage unit; or, the energy storage unit is a capacitor energy storage unit, and the first electrode 2 and the second electrode 3 are the first capacitor electrode and the second capacitor of the capacitor energy storage unit, respectively The electrode, the ion membrane 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 a variety of structural forms, when the first capacitor electrode and the second capacitor electrode When the same capacitor electrode material is used, the capacitive energy storage unit at this time is a symmetrical capacitor. When the first capacitor electrode and the second capacitor electrode are made of different capacitor electrode materials, the capacitive energy storage unit at this time is Asymmetrical 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 material, and the second electrode 3 is made of capacitive electrode material; or the first electrode 1 is made of capacitive electrode The second electrode 3 is made of battery anode material or battery anode material, which can also achieve the technical purpose of energy storage.

Further, the thickness of the ion membrane 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.

The bipolar conductive film of this embodiment includes a base 4a. Conductive layers 4b are provided on both sides of the base 4a, and the two conductive layers 4b are electrically connected, as shown in FIG. 3; or the base 4a is filled with conductive material 4d , The conductive material 4d is respectively exposed from both sides of the base 4a, as shown in FIG. 4. Specifically, the base 4a is made of metal foil or non-metallic 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 fiber or graphene. The base 4a can also be implemented in different structures. For example, the base 4a is provided with hollow holes 4c in an array, and the conductive layers 4b located on both sides of the base 4a fill the hollow holes 4c and realize conductive connection. Of course, the hollow holes 4c are filled with Conductive materials can also achieve the technical purpose of conduction; the base 4a can also use mesh metal foil or mesh non-metallic film, and the conductive layer 4b on both sides of the base 4a is filled with mesh metal foil or mesh non-metallic film Of course, the mesh space of the base 4a can be filled with conductive materials to achieve the technical purpose of conductivity. The mesh metal foil can be a mesh copper foil, and the mesh non-metal film can be a mesh carbon fiber.

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 ends of the bipolar conductive film 4 of this embodiment are provided with tabs 5, which is convenient for connecting other circuits or setting internal circuits. There are many ways to set the tab 5. When the base 4a is made of conductive material, the tab 5 can be set at the end of the base 4a; when the base 4a is made of non-metallic material, it needs to be set at the end of the base 4a. The two ends of the U-shaped tabs embedded on the U-shaped tabs are respectively conductively connected to the conductive layer 4b or the conductive material 4d on both sides of the base 4a. 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 directly made of a film that can conduct electronically but isolates ion conduction, and will not be repeated.

Specifically, the energy storage unit can also adopt multiple structures, such as: integrating the ion membrane 1 and the first electrode 2 belonging to the same energy storage unit; or combining the ion membrane 1 and the second electrode 2 belonging to the same energy storage unit. The electrodes 3 are integrated; or the first electrode 2, the ion membrane 1 and the second electrode 3 belonging to the same energy storage unit are integrated. The structure of the energy storage unit is the same as that of Embodiment 1, and will not be repeated one by one. By adopting an integrated structure, the assembly structure of the energy storage unit can be effectively simplified.

The other structure of this embodiment is the same as that of Embodiment 1, and will not be repeated one by one.

In the energy storage device of the bipolar conductive film connection structure of this embodiment, a plurality of energy storage units are arranged, and the first electrodes belonging to the two energy storage units are arranged adjacently, and the two adjacently arranged first electrodes A bipolar conductive film and a tab are arranged between one electrode, or the second electrodes belonging to two energy storage units are arranged adjacently, and a bipolar conductive film is arranged between the two adjacent second electrodes. Thin film and tabs; the two adjacent energy storage units can be connected in parallel, so that all the energy storage units arranged in sequence can be connected in parallel to effectively increase the output current.

Example 3

As shown in FIG. 9, it is a schematic structural diagram of Embodiment 3 of an energy storage device with a bipolar conductive film connection structure of the present invention. The energy storage device of the bipolar conductive film connection structure of this embodiment includes energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film 4 that can conduct electrons but isolate ion conduction; The unit includes an ion membrane 1 that is electrically insulated but can be ionically conducted or electrolyte traversed. A first electrode 2 and a second electrode 3 are provided on both sides of the ion membrane 1 respectively.

At least two adjacent energy storage units form an energy storage group. Among 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 The electrodes 2 are arranged adjacent to each other, and a bipolar conductive film 4 is connected between the adjacent second electrode 3 and the first electrode 2. That is, in this embodiment, all energy storage units belonging to the same energy storage group are connected in series.

In the two adjacent energy storage groups, the first electrode 2 located at the end of one of the energy storage groups is adjacent to the first electrode 2 located at the end of the other energy storage group, or is located at the end of one of the energy storage groups The second electrode 3 is arranged adjacent to the second electrode 3 located at the end of the other energy storage group, and between the two adjacent first electrodes 2 or between the two adjacent second electrodes 3 is used electron-capable The first conductor that conducts but isolates ion conduction is connected; among all the first conductors of the bipolar conductive film located between the energy storage groups, it is used between the first conductors located between two adjacent first electrodes 2 The outer circuit or the inner circuit is conductively connected, and the first conductors located between two adjacent second electrodes 3 are conductively connected by the outer circuit or the inner circuit. That is, the energy storage groups in this implementation are connected in parallel, and combined with the energy storage units connected in series that belong to the same energy storage group, the hybrid connection between all energy storage units can be realized, and the required voltage and current can be output. The energy storage device of the bipolar conductive film connection structure of this embodiment includes 3 energy storage groups, and each energy storage group is provided with 4 energy storage units.

In this embodiment, the bipolar conductive 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. Among two adjacent battery energy storage units, a bipolar conductive film 1 is provided 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 this embodiment, a bipolar conductive film 1 is provided on the first electrode 2 of one of the battery energy storage units and the second electrode 3 of the other battery energy storage unit adjacent to the same. It can effectively enhance the conductive connection performance between energy storage units, and reduce resistance and heat generation.

The first electrical conductor in this embodiment adopts a bipolar conductive film. Of course, the first electrical conductor can also be implemented by other electrical conductors that can satisfy electronic conduction but isolate ions. The bipolar conductive film 4 between adjacent energy storage groups includes a base 4a. The two sides of the base 4a are respectively provided with conductive layers 4b, and the two conductive layers 4b are electrically connected; or the base 4a is filled with a conductive material 4d, The conductive material 4d is respectively exposed from both sides of the base 4a. Specifically, the base 4a is made of metal foil or non-metallic 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 fiber, and graphene. The base 4a can also be implemented in different structures. For example, the base 4a is provided with hollow holes 4c in an array, and the conductive layers 4b located on both sides of the base 4a fill the hollow holes 4c and realize conductive connection. Of course, the hollow holes 4c are filled with Conductive materials can also achieve the technical purpose of conduction; the base 4a can also use mesh metal foil or mesh non-metallic film, and the conductive layer 4b on both sides of the base 4a is filled with mesh metal foil or mesh non-metallic film Of course, the mesh space of the base 4a can be filled with conductive materials to achieve the technical purpose of conductivity. The mesh metal foil can be a mesh copper foil, and the mesh non-metal film can be a mesh carbon fiber. In this embodiment, the thickness of the base 4a is 1 nm or more, and the thickness of the conductive layer 4b is 0.5 nm or more.

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

Specifically, the number of energy storage units included in all energy storage groups in this embodiment is equal, so that the output voltages of all energy storage groups are equal.

For other structures of this embodiment, reference may be made to Embodiment 1 and Embodiment 2, and will not be described one by one.

Example 4

As shown in FIG. 10, it is a schematic structural diagram of Embodiment 4 of an energy storage device with a bipolar conductive film connection structure of the present invention. The energy storage device of the bipolar conductive film connection structure of this embodiment includes energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film 4 that can conduct electrons but isolate ion conduction; The unit includes an ion membrane 1 that is electrically insulated but can be ionically conducted or electrolyte traversed. A first electrode 2 and a second electrode 3 are provided on both sides of the ion membrane 1 respectively.

At least two adjacent energy storage units form an energy storage group. Among 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 The electrodes 3 are arranged adjacent to each other, or the first electrode 2 of one of the energy storage units is arranged adjacent to the first electrode 2 of the other energy storage unit, and the adjacent second electrode 3 and the first electrode A bipolar conductive film 4 is provided between 1 to connect. Among all the bipolar conductive films 4 located in the same energy storage group, the bipolar conductive films 4 located between two adjacent first electrodes 2 are electrically connected by an external circuit or an internal circuit, and are located on two adjacent ones. The bipolar conductive films 4 between the second electrodes 3 are electrically connected by an external circuit or an internal circuit. That is, in this embodiment, all energy storage units belonging to the same energy storage group are connected in parallel.

In the two adjacent energy storage groups, the first electrode 2 located at the end of one of the energy storage groups is adjacent to the second electrode 3 located at the end of the other energy storage group, and the adjacent first electrode 2 It is connected to the second electrode 3 by a second electrical conductor that can conduct electricity but isolates ion conduction. That is, the energy storage groups of this embodiment are connected in series, and combined with the energy storage units connected in parallel within the energy storage group, the hybrid connection between all energy storage units can be realized, and the required voltage and current can be output. The number of energy storage groups in this embodiment is three, and each energy storage group is provided with four energy storage units.

In this embodiment, the bipolar conductive film between two adjacent energy storage units belonging to the same energy storage group includes a base 4a. Conductive layers 4b are provided on both sides of the base 4a, and the two conductive layers 4b conduct electricity. Connect; or the base 4a is filled with conductive material 4d, and the conductive material 4d is exposed from both sides of the base 4a. Specifically, the base 4a is made of metal foil or non-metallic 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 fiber, and graphene. The base 4a can also be implemented in different structures. For example, the base 4a is provided with hollow holes 4c in an array, and the conductive layers 4b located on both sides of the base 4a fill the hollow holes 4c and realize conductive connection. Of course, the hollow holes 4c are filled with Conductive materials can also achieve the technical purpose of conduction; the base 4a can also use mesh metal foil or mesh non-metallic film, and the conductive layer 4b on both sides of the base 4a is filled with mesh metal foil or mesh non-metallic film Of course, the mesh space of the base 4a can be filled with conductive materials to achieve the technical purpose of conductivity. The mesh metal foil can be a mesh copper foil, and the mesh non-metal film can be a mesh carbon fiber. 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 0.5 nm.

The second conductor in this embodiment adopts a bipolar conductive film. Of course, the second conductor can also be realized by other conductors that can meet electronic conduction but isolate ions. In particular, when the energy storage group has a large volume, it can be used Traditional electrical conductors connect two energy storage groups. The bipolar conductive film 4 between adjacent energy storage groups is coated on the side surface of the corresponding first electrode 2 or second electrode 3. Among two adjacent battery energy storage units, a bipolar conductive film 1 is provided 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 this embodiment, a bipolar conductive film 1 is provided on the first electrode 2 of one of the battery energy storage units and the second electrode 3 of the other battery energy storage unit adjacent to the same. It can effectively enhance the conductive connection performance between energy storage units, and reduce resistance and heat generation.

Of course, the bipolar conductive film 4 between 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 storage unit. In the energy unit, the first electrode 2 of one battery energy storage unit and/or the first electrode 2 of another battery energy storage unit adjacent to it is provided with a bipolar conductive film 4; or one of the battery energy storage units The second electrode 3 and/or the second electrode 3 of another battery energy storage unit adjacent to the second electrode 3 is provided with a bipolar conductive film 4, which will not be repeated.

Specifically, the number of energy storage units included in all energy storage groups in this embodiment is equal, so that the output currents of all energy storage groups are equal.

For other structures of this embodiment, reference may be made to Embodiment 1 and Embodiment 2, and will not be described one by one.

The above-mentioned embodiments are only preferred embodiments for fully explaining the present invention, and the protection scope of the present invention is not limited thereto. The equivalent substitutions or changes made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims (23)

1. An energy storage device with a bipolar conductive film connection structure, which is characterized in that it comprises energy storage units arranged in sequence, and two adjacent energy storage units are connected by a bipolar conductive film that is electrically conductive but isolated from ion conductivity The energy storage unit includes an ion membrane that is electrically insulated but can be ionically conductive or electrolyte traversed, and a first electrode and a second electrode are respectively provided on both sides of the ion membrane;

   Among the two adjacent energy storage units, the second electrode of one of the energy storage units and the first electrode of the other energy storage unit are adjacently arranged, and in the adjacent The second electrode and the first electrode are connected by the bipolar conductive film; or,

   Among the two adjacent energy storage units, the first electrode of one of the energy storage units is adjacent to the first electrode of the other energy storage unit, or one of the energy storage units The second electrode and the second electrode of the other energy storage unit are arranged adjacently, and between the two adjacent first electrodes or between the adjacent two second electrodes The bipolar conductive films are connected; among all the bipolar conductive films, the bipolar conductive films located between two adjacent first electrodes are electrically connected by an external circuit or an internal circuit, and are located The bipolar conductive films between two adjacent second electrodes are electrically connected by an external circuit or an internal circuit; or,

   At least two adjacent energy storage units constitute an energy storage group, and among the two adjacent energy storage units belonging to the same energy storage group, the second electrode of one of the energy storage units is connected to The first electrodes of the other energy storage unit are arranged adjacent to each other, and the bipolar conductive film is connected between the adjacent second electrode and the first electrode; two adjacent In the energy storage group, the first electrode located at the end of one of the energy storage groups is adjacent to the first electrode located at the end of the other energy storage group, or is located at one of the The second electrode at the end of the energy storage group is arranged adjacent to the second electrode at the end of the other energy storage group, and is located between or adjacent to the two adjacent first electrodes The two second electrodes are connected by a first electrical conductor that can conduct electrons but isolate ion conduction. Among all the first electrical conductors located between the energy storage groups, they are located in the two adjacent ones. The first conductors between the first electrodes are electrically connected by an external circuit or an internal circuit, and the first conductors between two adjacent second electrodes are connected by an external circuit or an internal circuit. The electrical circuit is connected; or,

   At least two adjacent energy storage units constitute an energy storage group, and among the two adjacent energy storage units belonging to the same energy storage group, the first electrode of one of the energy storage units is connected to The first electrodes of the other energy storage unit are arranged adjacent to each other, or the second electrode of one of the energy storage units is arranged adjacent to the second electrode of the other energy storage unit, the Two adjacent first electrodes or two adjacent second electrodes are connected by the bipolar conductive film; all the bipolar conductive films located in the same energy storage group Wherein, the bipolar conductive films located between the two adjacent first electrodes are electrically connected by an external circuit or an internal circuit, and the bipolar conductive films located between the two adjacent second electrodes The polar conductive films are electrically connected by an external circuit or an internal circuit; in two adjacent energy storage groups, the first electrode at the end of one of the energy storage groups and the end of the other energy storage group The second electrodes are arranged adjacent to each other, and are connected between the adjacent first electrode and the second electrode by using a second electrical conductor that can conduct electricity but isolates ion conduction.
2. The energy storage device with a bipolar conductive film connection structure according to claim 1, wherein the number of the energy storage units included in all the energy storage groups is equal.
3. The energy storage device with a bipolar conductive film connection structure 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 the battery energy storage unit The positive electrode and the negative electrode; the ion membrane is located between the positive electrode and the negative electrode belonging to the same battery energy storage unit.
4. The energy storage device with a bipolar conductive film connection structure according to claim 1, wherein the energy storage unit is a capacitive energy storage unit, and the first electrode and the second electrode are respectively the capacitive energy storage unit The first capacitor electrode and the second capacitor electrode, the ion membrane is located between the first capacitor electrode and the second capacitor electrode belonging to the same capacitor energy storage unit.
5. The energy storage device with a bipolar conductive film connection structure according to claim 4, wherein the first capacitor electrode and the second capacitor electrode are made of the same capacitor electrode material or are made of different capacitor electrode materials .
6. The energy storage device with a bipolar conductive film connection structure according to claim 1, wherein the energy storage unit is a hybrid energy storage unit, and the first electrode is made of battery cathode material or battery anode material, and The second electrode is made of capacitor electrode material; or, the first electrode is made of capacitor electrode material, and the second electrode is made of battery positive electrode material or battery negative electrode material.
7. The energy storage device with a bipolar conductive film connection structure according to claim 1, wherein the thickness of the ion membrane 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. 1nm or more.
8. The energy storage device with a bipolar conductive film connection structure according to claim 1, wherein the first electrical conductor and the second electrical conductor use the bipolar conductive film.
9. The energy storage device with a bipolar conductive film connection structure according to any one of claims 1-8, wherein the bipolar conductive film is coated on the side surface of the corresponding first electrode or second electrode .
10. The energy storage device with a bipolar conductive film connection structure according to claim 3, characterized in that: among two adjacent battery energy storage units, the first electrode and/or of one of the battery energy storage units Or the second electrode of another battery energy storage unit adjacent to it is provided with the bipolar conductive film; or,

    In two adjacent battery energy storage units, the first electrode of one of the battery energy storage units and/or the first electrode of the other adjacent battery energy storage unit is provided with The bipolar conductive film; or,

    In the two adjacent battery energy storage units, the second electrode of one of the battery energy storage units and/or the second electrode of the other adjacent battery energy storage unit is provided with The bipolar conductive film.
11. The energy storage device with a bipolar conductive film connection structure according to claim 9, wherein the bipolar conductive film is made of, but not limited to, carbon, graphite, graphene or metal film.
12. The energy storage device with a bipolar conductive film connection structure according to claim 11, wherein the thickness of the bipolar conductive film is greater than or equal to 1 nm.
13. The energy storage device with a bipolar conductive film connection structure according to claim 1, wherein the ion membrane and the first electrode belonging to the same energy storage unit are integrated; or belong to the same institute. The ion membrane and the second electrode of the energy storage unit are arranged as one body; or the first electrode, the ion membrane and the second electrode belonging to the same energy storage unit are arranged as one body.
14. The energy storage device with a bipolar conductive film connection structure according to any one of claims 1-8, characterized in that: the bipolar conductive film comprises a substrate, and two conductive layers are provided on both sides of the substrate. Conductive connection between the conductive layers; or, the base body is filled with conductive materials, and the conductive materials are respectively exposed from both sides of the base body.
15. The energy storage device with a bipolar conductive film connection structure according to claim 14, wherein the substrate is made of metal foil or non-metal film.
16. The energy storage device with a bipolar conductive film connection structure according to claim 15, wherein the metal foil includes but is not limited to copper foil, aluminum foil or steel foil; the non-metallic film includes but is not limited to polymer , Carbon fiber, graphene.
17. The energy storage device with a bipolar conductive film connection structure according to claim 14, wherein the array is provided with hollow holes on the substrate, and the conductive layer material located on both sides of the substrate fills the hollow holes and A conductive connection is realized; or, the conductive material is filled in the hollow hole.
18. The energy storage device with a bipolar conductive film connection structure according to claim 14, wherein the substrate is a mesh metal foil or a mesh non-metal film, and the conductive layer material is located on both sides of the substrate. Fill the mesh space of the mesh metal foil or mesh non-metal film and realize conductive connection; or the mesh space of the substrate is filled with the conductive material.
19. The energy storage device with a bipolar conductive film connection structure according to claim 18, wherein the mesh metal foil is a mesh copper foil, and the mesh non-metal film is a mesh carbon fiber.
20. The energy storage device with a bipolar conductive film connection structure according to claim 14, 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.
21. The energy storage device with a bipolar conductive film connection structure according to claim 14, wherein the ends of the bipolar conductive film are provided with tabs.
22. The energy storage device with a bipolar conductive film connection structure according to claim 14, wherein the ion membrane and the first electrode belonging to the same energy storage unit are integrated; or belong to the same institute. The ion membrane and the second electrode of the energy storage unit are arranged as one body; or the first electrode, the ion membrane and the second electrode belonging to the same energy storage unit are arranged as one body.
23. The energy storage device with a bipolar conductive film connection structure according to any one of claims 1-8, wherein the bipolar conductive film is made of a film that can conduct electronically but isolate ion conduction.

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