Low-polarization conductive system

Abstract

The utility model provides a low-polarization conductivity system. The low-polarization conductivity system comprises a first external electric field end plate, a second external electric field end plate, an external power supply and a conductivity device to be improved, a first electrode end of the external power supply is connected with the first external electric field end plate, and a second electrode end of the external power supply is connected with the second external electric field end plate; a first output terminal of the device to be improved in conductivity is connected with the first external electric field end plate, and a second output terminal of the device to be improved in conductivity is connected with the second external electric field end plate. The structure implementation mode is simple, and the forward electric field force is applied to ions in the transmission process from ion deintercalation to ion intercalation, so that the ions can be transmitted into the thick electrode more easily, concentration polarization in the electrolyte is reduced, electrode dynamics is improved, and the rate capability of the to-be-improved conductance device is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of conductance, and particularly relates to a conductance system with low polarization. Background Art

[0002] With the rapid development of new energy technologies in China, the energy structure is gradually transforming. Among them, lithium-ion batteries are widely used in new energy vehicles, industrial and commercial energy storage, etc., and high-voltage battery modules have also become core components. At present, single-cell batteries on the market generally adopt an internal parallel connection method to increase the single-cell capacity, and then achieve a high-voltage module through the series connection between single-cell batteries. In the process of forming a group, there will be auxiliary materials such as redundant wire harnesses and structural parts, which is not conducive to the highly integrated development of the battery cells. When the single-cell battery adopts an internal series connection method and the electrodes are made into bipolar electrodes, the voltage of the single cell can be doubled. However, the capacity of this type of structure single cell is generally relatively low, and the single-cell capacity needs to be increased by using thick electrodes. However, thick electrodes will lead to an extended transmission path of lithium ions, which is not conducive to the transmission of lithium ions and also affects the rate performance of the battery, resulting in poor rate performance of the battery. Summary of the Utility Model

[0003] An embodiment of the utility model provides a conductance system with low polarization, aiming to solve problems such as long lithium-ion transmission paths and poor battery rate performance caused by thick electrodes in existing bipolar high-voltage battery structures. Through the structure of this application, the diffusion rate of ions can be effectively increased, the concentration polarization inside the battery cell can be reduced, the dynamics of the electrode can be improved, and the rate performance of the battery can be improved.

[0004] To achieve the above object, an embodiment of the utility model provides a conductance system with low polarization, including a first externally applied electric field end plate, a second externally applied electric field end plate, an external power supply, and a device to be improved in conductance; the first electrode terminal of the external power supply is connected to the first externally applied electric field end plate, and the second electrode terminal of the external power supply is connected to the second externally applied electric field end plate; the first output terminal of the device to be improved in conductance is connected to the first externally applied electric field end plate, and the second output terminal of the device to be improved in conductance is connected to the second externally applied electric field end plate.

[0005] As a preferred embodiment, the first externally applied electric field end plate and the second externally applied electric field end plate are symmetrically arranged.

[0006] As a preferred embodiment, when the conductance system with low polarization is in a charging state, the first electrode terminal is the positive terminal, and the second electrode terminal is the negative terminal; the first output terminal is the positive output terminal, and the second output terminal is the negative output terminal.

[0007] As a preferred embodiment, when the low-polarization conductance system is in a charging state, the electric field direction of the external power supply points from the positive electrode of the conductance device to be improved to the negative electrode of the conductance device to be improved.

[0008] As a preferred embodiment, when the low-polarization conductance system is in a discharging state, the first electrode terminal is the negative terminal, and the second electrode terminal is the positive terminal; the first output terminal is the positive output terminal, and the second output terminal is the negative output terminal.

[0009] As a preferred embodiment, when the low-polarization conductance system is in a discharging state, the electric field direction of the external power supply points from the negative electrode of the conductance device to be improved to the positive electrode of the conductance device to be improved.

[0010] As a preferred embodiment, the conductance device to be improved is a conductance device for improving ionic conductivity.

[0011] As a preferred embodiment, the conductance device to be improved includes a bipolar cell or a conductivity system.

[0012] As a preferred embodiment, the bipolar cell includes a plurality of battery units connected in series.

[0013] As a preferred embodiment, the bipolar cell is a lithium-ion battery cell, a sodium-ion battery cell, or a zinc-ion battery cell.

[0014] In this application, by applying an external power supply to the conductance device to be improved and using a physical method driven by the conductance device to be improved, the performance of the conductance device to be improved is improved. The damage to the conductance device to be improved is small, and the advantages of the thick electrode can be fully utilized. The structure of this application has high adaptability to the existing high-voltage system, and the electric field is in a static state and does not directly consume energy. The implementation method of the structure of this application is simple, and the improvement of the performance of the conductance device to be improved can be achieved without complex methods such as nanoscale optimization of raw materials and microscale optimization design of electrodes. In this application, by applying a positive electric field force during the transmission process of ion extraction to insertion, it is more conducive to the ions to be transported into the thick electrode, thereby reducing the concentration polarization in the electrolyte to improve the electrode kinetics, and effectively improving the rate performance of the conductance device to be improved. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0016] Figure 1 is a schematic structural diagram of a low-polarization conductance system according to an embodiment of the present utility model;

[0017] Figure 2 is Figure 1 a schematic diagram of the state of the low-polarization conductance system in a discharging state;

[0018] Figure 3 is Figure 1 a schematic diagram of the state of the low-polarization conductance system in a charging state. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0020] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In this application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0022] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0023] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0024] Specifically, as Figures 1 to 3 shown, the embodiment of the present utility model provides a low-polarization conductance system, including a first externally applied electric field end plate 10, a second externally applied electric field end plate 20, an external power supply 30, and a device 40 to be improved in conductance; a first electrode terminal 31 of the external power supply 30 is connected to the first externally applied electric field end plate 10, and a second electrode terminal 32 of the external power supply 30 is connected to the second externally applied electric field end plate 20; a first output terminal 41 of the device 40 to be improved in conductance is connected to the first externally applied electric field end plate 10, and a second output terminal 42 of the device 40 to be improved in conductance is connected to the second externally applied electric field end plate 20.

[0025] As a preferred embodiment, the first externally applied electric field end plate 10 and the second externally applied electric field end plate 20 are symmetrically arranged. In this way, the stability of the electric field applied by the external power supply can be ensured, which is more conducive to the transport of ions into the thick electrode, thereby reducing the concentration polarization in the electrolyte, improving the electrode kinetics, and effectively improving the rate performance of the device to be improved in conductance.

[0026] As a preferred embodiment, when the low-polarization conductance system is in the charging state, the first electrode terminal 31 is the positive terminal, and the second electrode terminal 32 is the negative terminal; the first output terminal 41 is the positive output terminal, and the second output terminal 42 is the negative output terminal.

[0027] As a preferred embodiment, when the low-polarization conductance system is in the charging state, the electric field direction of the external power supply 30 points from the positive electrode of the device 40 to be improved in conductance to the negative electrode of the device 40 to be improved in conductance.

[0028] As a preferred embodiment, when the low-polarization conductance system is in the discharging state, the first electrode terminal 31 is the negative terminal, and the second electrode terminal 32 is the positive terminal; the first output terminal 41 is the positive output terminal, and the second output terminal 42 is the negative output terminal.

[0029] As a preferred embodiment, when the low-polarization conductance system is in a discharging state, the electric field direction of the external power supply 30 points from the negative electrode of the conductance device 40 to be improved to the positive electrode of the conductance device 40 to be improved.

[0030] As a preferred embodiment, the conductance device 40 to be improved is a conductance device for improving ionic conductivity.

[0031] As a preferred embodiment, the conductance device 40 to be improved includes a bipolar cell or a conductivity system. Specifically, in this embodiment, the conductance device 40 to be improved is a bipolar cell.

[0032] As a preferred embodiment, the bipolar cell includes a plurality of battery units connected in series.

[0033] As a preferred embodiment, the bipolar cell is a lithium-ion battery cell, a sodium-ion battery cell or a zinc-ion battery cell. Specifically, in this embodiment, the bipolar cell is a lithium-ion battery cell. It can be understood that in other embodiments, according to actual usage needs, the bipolar cell can also be a sodium-ion battery cell or a zinc-ion battery cell.

[0034] As Figures 2 to 3 shown, when discharging using the conductance system of the present application, a positive charge source of the external power supply is applied outside the negative electrode of the conductance device to be improved, and a negative charge source of the external power supply is applied outside the positive electrode of the conductance device to be improved. Then, the electric field direction points from the negative electrode of the conductance device to be improved to the positive electrode of the conductance device to be improved. At this time, after the lithium ions in the conductance device to be improved escape from the negative electrode, the force direction is from the negative electrode of the conductance device to be improved to the positive electrode of the conductance device to be improved. Therefore, during the discharging process of the conductance device to be improved, the diffusion speed of the lithium ions is increased under the action of the electric field force. During charging, a negative charge source of the external power supply is applied outside the negative electrode of the conductance device to be improved, and a positive charge source of the external power supply is applied outside the positive electrode of the conductance device to be improved. Then, the electric field direction points from the positive electrode of the conductance device to be improved to the negative electrode of the conductance device to be improved. At this time, after the lithium ions in the conductance device to be improved escape from the positive electrode, the force direction is also from the positive electrode of the conductance device to be improved to the negative electrode of the conductance device to be improved. Therefore, during the charging process of the conductance device to be improved, the diffusion speed of the lithium ions is increased under the action of the electric field force.

[0035] In this application, an external power supply is applied to the conductance device to be improved, and the performance of the conductance device to be improved is enhanced by a physical method driven by the conductance device to be improved. This causes little damage to the conductance device to be improved and can give full play to the advantages of thick electrodes. The structure of this application has high adaptability to the existing high-voltage system, and the electric field is in a static state without directly consuming energy. The implementation method of the structure of this application is simple and does not require complex methods such as nanoscale optimization of raw materials and optimized design at the microscopic level of the electrodes to improve the performance of the conductance device to be improved. In this application, during the process of ion deintercalation to intercalation, a positive electric field force is applied to it, which is more conducive to the ions being transported into the thick electrode, thereby reducing the concentration polarization in the electrolyte to improve the electrode kinetics, and effectively improving the rate performance of the conductance device to be improved.

[0036] In the description of this specification, the description referring to terms such as "one embodiment" and "example" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0037] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-polarization conductance system, characterized in that, It includes a first external electric field end plate, a second external electric field end plate, an external power supply, and a conductance device to be improved; the first electrode terminal of the external power supply is connected to the first external electric field end plate, and the second electrode terminal of the external power supply is connected to the second external electric field end plate; the first output terminal of the conductance device to be improved is connected to the first external electric field end plate, and the second output terminal of the conductance device to be improved is connected to the second external electric field end plate.

2. The low-polarization conductance system according to claim 1, wherein The first external electric field end plate and the second external electric field end plate are symmetrically arranged.

3. The low-polarization conductance system according to claim 1, wherein When the low-polarization conductance system is in the charging state, the first electrode terminal is the positive terminal, and the second electrode terminal is the negative terminal; the first output terminal is the positive output terminal, and the second output terminal is the negative output terminal.

4. The low polarization conductance system according to claim 1, characterized in that When the low-polarization conductance system is in the charging state, the electric field direction of the external power supply points from the positive electrode of the conductance device to be improved to the negative electrode of the conductance device to be improved.

5. The low-polarization conductance system according to claim 1, characterized in that, When the low-polarization conductance system is in the discharging state, the first electrode terminal is the negative terminal, and the second electrode terminal is the positive terminal; the first output terminal is the positive output terminal, and the second output terminal is the negative output terminal.

6. The low polarization conductance system according to claim 1, wherein When the low-polarization conductance system is in the discharging state, the electric field direction of the external power supply points from the negative electrode of the conductance device to be improved to the positive electrode of the conductance device to be improved.

7. The low-polarization conductance system according to claim 1, wherein The conductance device to be improved is a conductance device for improving ionic conductivity.

8. The low polarization conductance system according to claim 1, wherein The conductance device to be improved includes a bipolar cell or a conductivity system.

9. The low polarization conductance system according to claim 8, characterized in that, The bipolar cell includes a plurality of battery units connected in series.

10. The low polarization conductance system according to claim 8, wherein The bipolar cell is a lithium-ion battery cell, a sodium-ion battery cell, or a zinc-ion battery cell.

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