Mixed inner-series battery cell, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a mixed inner-series battery cell, a battery and electric equipment. Wherein the mixed inner-string battery cell comprises a first pole piece, a second pole piece, at least two supporting inner layers and at least two ion conducting inner layers; the polarities of the first pole piece and the second pole piece are opposite; the supporting inner layer and the ion conducting inner layer are arranged between the first pole piece and the second pole piece; and the supporting inner layers and the ion conducting inner layers are arranged alternately. According to the utility model, the arrangement of no current collector in the battery cell can be realized, the output voltage of the battery cell can be improved, the use efficiency is improved, the technological process is simplified, and the number of parts is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a hybrid internally-connected battery cell, a battery and an electrical device. Background Art

[0002] With the rapid development of the electric vehicle industry, electric vehicles have put forward higher requirements for key indicators such as driving range, safety, and fast charging capabilities of power batteries. The national solid-state battery uses solid electrolytes with low combustion risks, which can greatly improve the safety performance of the battery, while also improving the battery energy density and fast charging capabilities. It is considered an important option for the next generation of lithium batteries.

[0003] However, the voltage of most existing battery cells cannot exceed 5V, and a large amount of inactive substances occupy the volume of the battery cells, which reduces the energy density of the battery cells and further reduces the output voltage, affecting its utilization efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a hybrid internal series battery cell, a battery and an electrical device to address the deficiencies of the prior art, so as to solve the problem that a large amount of inactive substances occupy the volume in the existing battery cells and the energy density of the battery cells is reduced.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A hybrid inner series battery cell comprises a first pole piece, a second pole piece, at least two supporting inner layers and at least two ion-conducting inner layers; the first pole piece and the second pole piece have opposite polarities; the supporting inner layer and the ion-conducting inner layer are arranged between the first pole piece and the second pole piece; and the supporting inner layer and the ion-conducting inner layer are arranged alternately with each other.

[0007] Preferably: one side surface of the ion-conducting inner layer at one edge is connected to one end surface of the first pole piece; one side surface of the ion-conducting inner layer at another edge is connected to one end surface of the second pole piece;

[0008] And / or, the ion-conducting inner layer is an electrolyte layer.

[0009] Preferably: the supporting inner layer comprises a first active material supporting layer and a second active material supporting layer and a conductive connecting layer connected between the first active material supporting layer and the second active material supporting layer; and the ion-conducting inner layer is arranged between the first active material supporting layer in one of the supporting inner layers and the second active material supporting layer in another adjacent supporting inner layer;

[0010] The material polarity of the first active material supporting layer is opposite to the material polarity of the second active material supporting layer.

[0011] Preferably, the first pole piece includes a first current collector and a first active material layer; the first active material layer is connected to the surface of the first current collector close to the ion-conducting inner layer.

[0012] And / or, the second pole piece includes a second current collector and a second active material layer; the second active material layer is connected to the surface of the second current collector close to the side of the ion-conducting inner layer.

[0013] Preferably: the material polarity of the second active material supporting layer is the same as that of the first active material layer; and / or the material polarity of the first active material supporting layer is the same as that of the second active material layer.

[0014] Preferably: the material polarity of the first active material layer is opposite to that of the first active material supporting layer at one adjacent edge thereof; the material polarity of the second active material layer is opposite to that of the second active material supporting layer at the other adjacent edge thereof.

[0015] Preferably, the relationship between the width L1 of the supporting inner layer, the width L2 of the first pole piece and the width L3 of the second pole piece satisfies: L2<L1<L3.

[0016] Preferably, the relationship between the height H1 of the ion-conducting inner layer, the height H2 of the first pole piece and the height H3 of the second pole piece satisfies: H2=H3

[0017] The utility model also discloses a battery, comprising the above-mentioned hybrid internally connected battery cells.

[0018] The utility model also discloses an electrical device, comprising the battery mentioned above.

[0019] The beneficial effect of the utility model lies in that the technical solution adopts two first pole pieces and second pole pieces with opposite polarities to be arranged on both sides, and the supporting inner layer and the ion-conducting inner layer in the middle are alternately mixed and stacked with each other, thereby effectively reducing the volume of the battery cell occupied by inactive substances and improving the energy density; thereby, a setting without a current collector inside the battery cell can be realized, and the output voltage of the battery cell can be improved, the utilization efficiency can be improved, the process flow can be simplified, and the number of parts can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following will refer to the attached Figures 1 to 3 To describe the features, advantages and technical effects of exemplary embodiments of the present utility model.

[0021] Figure 1 This is a schematic diagram of the structure of a hybrid internal series battery cell according to an embodiment of the utility model;​

[0022] Figure 2 This is a schematic diagram of the structure of a hybrid internal series battery cell according to an embodiment of the utility model;

[0023] Figure 3 It is a schematic structural diagram of a hybrid internal series battery cell according to an embodiment of the utility model.

[0024] In the figure: 1-first pole piece; 11-first current collector; 12-first active material layer; 13-first pole tab; 2-second pole piece; 21-second current collector; 22-second active material layer; 23-second pole tab; 3-support inner layer; 31-first active material support layer; 32-second active material support layer; 33-conductive connecting layer; 4-ion-conducting inner layer. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist at the same time, and multiple situations exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in a mixed "or" relationship of internally connected battery cells, batteries and electrical equipment.

[0029] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] The following is combined with Figure 1 to Figure 3 The utility model is further described in detail, but it is not intended to limit the utility model.

[0033] like Figure 1 As shown, in one embodiment of the utility model, the hybrid internal series battery cell comprises a first pole piece 1, a second pole piece 2, at least two supporting inner layers 3 and at least two ion-conducting inner layers 4; the first pole piece 1 and the second pole piece 2 have opposite polarities; the supporting inner layer 3 and the ion-conducting inner layer 4 are arranged between the first pole piece 1 and the second pole piece 2; and the supporting inner layer 3 and the ion-conducting inner layer 4 are arranged alternately in layers. Among them, the first pole piece 1 is a positive pole piece; the second pole piece 2 is a negative pole piece; or, the first pole piece 1 is a negative pole piece; the second pole piece 2 is a positive pole piece. Among them, the hybrid internal series refers to that the supporting inner layer 3 and the ion-conducting inner layer 4 are mixed with each other and the supporting inner layers 3 are connected in series with each other.

[0034] The technical solution of the utility model adopts two first pole pieces and second pole pieces with opposite polarities to be arranged on both sides, and the supporting inner layer and the ion-conducting inner layer in the middle are alternately mixed and stacked with each other, thereby effectively reducing the volume of the battery cell occupied by more inactive substances and improving the energy density; thereby, a current collector-free setting inside the battery cell can be realized, and the output voltage of the battery cell can be increased, the utilization efficiency can be improved, the process flow can be simplified, and the number of parts can be reduced.

[0035] Specifically, in some embodiments, one side of the ion-conducting inner layer 4 at one edge is connected to one end face of the first pole piece 1; one side of the ion-conducting inner layer 4 at the other edge is connected to one end face of the second pole piece 2; wherein the ion-conducting inner layer is an electrolyte layer; preferably a solid electrolyte layer; further, the solid electrolyte layer is a non-ionic electrolyte such as unsaturated alcohols, polyester alcohols, aromatic ketones, or an ionic compound electrolyte such as potassium chloride, potassium sulfate, sodium nitrate. In other words, the ion-conducting inner layer 4 is used to separate the adjacent supporting inner layers 3, the supporting inner layer 3 and the first pole piece 1, and the supporting inner layer 3 and the second pole piece 2; thereby ensuring the stability of the operation of the two pole pieces of opposite polarity and avoiding short circuits. wherein one edge is the left edge; the other edge is the right edge.

[0036] Specifically, in some embodiments, Figure 1 and 2 As shown, the first pole piece 1 includes a first current collector 11 and a first active material layer 12; the first active material layer 12 is connected to the surface of the first current collector 11 near the ion-conducting inner layer 4. In other words, the first pole piece 1 is a single-sided pole piece. By connecting active materials in series inside the single-sided pole piece, a design without a current collector inside the pole piece is realized, which can effectively reduce the inactive material from occupying more battery volume, thereby increasing the power supply of the battery cell. Figure 3 As shown, a first electrode tab 13 is disposed at one side end of the first current collector 11. The first current collector 11 is an aluminum foil.

[0037] Specifically, in some embodiments, Figure 1 and 2 As shown, the second pole piece 2 includes a second current collector 21 and a second active material layer 22; the second active material layer 22 is connected to the surface of the second current collector 21 on the side close to the ion-conducting inner layer 4. In other words, the second pole piece 2 is also a single-sided pole piece. By connecting active materials in series inside the single-sided pole piece, a design without a current collector inside the pole piece is realized, which can effectively reduce the inactive material from occupying more battery volume, thereby increasing the power supply of the battery cell. Among them, as Figure 3 As shown, a second electrode tab 23 is disposed at one side end of the second current collector 21. The second current collector 21 is a copper foil.

[0038] Among them, the voltage value between the first pole tab 13 and the second pole tab 23 is: total voltage = number of (ion-conducting inner layer 4 or supporting inner layer 3) layers × single cell voltage (a single cell is composed of a first pole tab 13, a second pole tab 23 and an ion-conducting inner layer 4).

[0039] Specifically, in some embodiments, Figure 1 and 2 As shown, the number of supporting inner layers 3 is at least two, and they are respectively arranged between two adjacent ion-conducting inner layers 4; and the supporting inner layer 3 includes a first active material supporting layer 31 and a second active material supporting layer 32 and a conductive connecting layer 33 connected between the first active material supporting layer 31 and the second active material supporting layer 32; the material polarity of the first active material supporting layer 31 is opposite to the material polarity of the second active material supporting layer 32; and the ion-conducting inner layer 4 is arranged between the first active material supporting layer 31 in one supporting inner layer 3 and the second active material supporting layer 32 in another adjacent supporting inner layer 3. Figure 2 As shown, the material polarity of the second active material supporting layer 32 is the same as the material polarity of the first active material layer 12 of the first electrode 1. Further, the material of the second active material supporting layer 32 is the same as the material of the first active material layer 12. Figure 2 As shown, the material polarity of the first active material support layer 31 is the same as the material polarity of the second active material layer 22 of the second electrode 2. That is to say, the material polarity of the first active material layer 12 is opposite to the material polarity of the first active material support layer 31 adjacent to one edge thereof; the material polarity of the second active material layer 22 is opposite to the material polarity of the second active material support layer 32 adjacent to the other edge. This structure can realize the normal electrical properties of the battery cell through the interlaced first active material support layer 31 and the second active material support layer 32 and the first active material layer 12 and the second active material layer 22, thereby improving the use efficiency. Among them, the material of the first active material support layer 31 is the same as the material of the second active material layer 22 and the component content is also the same; the material of the second active material support layer 32 is the same as the material of the first active material layer 12 and the component content is also the same; this structure can ensure that the electrical properties of each part of the battery cell are as similar as possible, and improve the structural stability and operation stability. Among them, the conductive connection layer 33 is a conductive glue layer; further, the material of the conductive glue layer is nickel-carbon conductive glue, silver-copper conductive glue, etc., so as to achieve the connection stability between the first active material support layer 31 and the second active material support layer 32, and realize the functions of ion insulation and electronic conduction, thereby replacing the current collector.

[0040] Specifically, in some embodiments, the relationship between the width L1 of the supporting inner layer 3, the width L2 of the first pole piece 1, and the width L3 of the second pole piece 2 satisfies: L2<L1<L3. In some embodiments, when the first pole piece 1 is a positive pole piece and the second pole piece 2 is a negative pole piece, L2<L1<L3. In some embodiments, the relationship between the sum of the widths L1 of the first active material supporting layer 31, the second active material supporting layer 32, and the conductive connecting layer 33, the width L2 of the first pole piece 1, and the width L3 of the second pole piece 2 satisfies: L2<L1<L3. This structure can ensure the thickness value of the battery cell and its operating stability through the reasonable thickness difference of the supporting inner layer 3, the first pole piece 1, and the second pole piece 2, and can also effectively improve its voltage value.

[0041] Specifically, in some embodiments, Figure 3 As shown, the relationship between the height H1 of the ion-conducting inner layer 4, the height H2 of the first pole piece 1, and the height H3 of the second pole piece 2 satisfies: H2=H3

[0042] The utility model also proposes a battery, which includes a hybrid internally-series battery cell. The specific structure of the hybrid internally-series battery cell refers to the above-mentioned embodiment. Since the battery adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0043] Among them, battery refers to a cup, trough or other container or part of a composite container that contains electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy; the battery has positive and negative electrodes. With the advancement of science and technology, batteries generally refer to small devices that can generate electrical energy, such as solar cells. The performance parameters of batteries mainly include electromotive force, capacity, specific energy and resistance. Battery principle: In chemical batteries, the direct conversion of chemical energy into electrical energy is the result of spontaneous oxidation, reduction and other chemical reactions inside the battery, which are carried out on the two electrodes respectively. The negative electrode active material is composed of a reducing agent with a relatively negative potential and stable in the electrolyte, such as active metals such as zinc, cadmium, and lead, and hydrogen or hydrocarbons. The positive electrode active material is composed of an oxidizing agent with a relatively positive potential and stable in the electrolyte, such as metal oxides such as manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, oxygen-containing acids and their salts, etc. The electrolyte is a material with good ionic conductivity, such as an aqueous solution of acid, alkali, or salt, an organic or inorganic non-aqueous solution, a molten salt, or a solid electrolyte.

[0044] ​The utility model also proposes an electrical device, which includes a battery. The specific structure of the battery refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0045] Among them, electrical equipment may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys and electric tools, etc.

[0046] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0047] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A hybrid internal series battery cell, characterized in that: It includes a first pole piece, a second pole piece, at least two supporting inner layers and at least two ion-conducting inner layers; the first pole piece and the second pole piece have opposite polarities; the supporting inner layer and the ion-conducting inner layer are arranged between the first pole piece and the second pole piece; and the supporting inner layer and the ion-conducting inner layer are arranged alternately with each other.

2. The hybrid inner series battery cell according to claim 1, characterized in that: One side surface of the ion-conducting inner layer at one edge is connected to one end surface of the first pole piece; one side surface of the ion-conducting inner layer at the other edge is connected to one end surface of the second pole piece; And / or, the ion-conducting inner layer is an electrolyte layer.

3. The hybrid inner series battery cell according to claim 1, characterized in that: The supporting inner layer includes a first active material supporting layer, a second active material supporting layer, and a conductive connecting layer connected between the first active material supporting layer and the second active material supporting layer; and the ion-conducting inner layer is disposed between the first active material supporting layer in one of the supporting inner layers and the second active material supporting layer in another adjacent supporting inner layer; The material polarity of the first active material supporting layer is opposite to the material polarity of the second active material supporting layer.

4. The hybrid inner series battery cell according to claim 3, characterized in that: The first pole piece includes a first current collector and a first active material layer; the first active material layer is connected to the surface of the first current collector close to the side of the ion-conducting inner layer; And / or, the second pole piece includes a second current collector and a second active material layer; the second active material layer is connected to the surface of the second current collector close to the side of the ion-conducting inner layer.

5. The hybrid inner series battery cell according to claim 4, characterized in that: The material polarity of the second active material supporting layer is the same as that of the first active material layer; And / or, the material polarity of the first active material supporting layer is the same as that of the second active material layer.

6. The hybrid inner series battery cell according to claim 4 or 5, characterized in that: The material polarity of the first active material layer is opposite to that of the first active material supporting layer adjacent to one edge thereof; the material polarity of the second active material layer is opposite to that of the second active material supporting layer adjacent to the other edge thereof.

7. The hybrid inner series battery cell according to claim 2, characterized in that: The relationship between the width L1 of the supporting inner layer, the width L2 of the first pole piece, and the width L3 of the second pole piece satisfies: L2<L1<L3.

8. The hybrid inner series battery cell according to claim 1, characterized in that: The relationship between the height H1 of the ion-conducting inner layer, the height H2 of the first pole piece, and the height H3 of the second pole piece satisfies: H2=H3<H1.

9. A battery, characterized in that: The hybrid inner series battery cell comprises the hybrid inner series battery cell as described in any one of claims 1 to 8.

10. An electrical equipment, characterized in that: A battery comprising the battery as claimed in claim 9.

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