CN217822870U - Battery cell, battery and electronic equipment - Google Patents

Abstract

The disclosure provides a battery cell, a battery and an electronic device. The battery cell comprises at least one first negative electrode, the material of at least one first active layer of the first negative electrode comprises a quick charging functional material, so that the first negative electrode has a quick charging function, the quick charging efficiency and the cycle life of the battery cell and the charge state of the battery cell in the charging process are promoted, and the use safety of the battery cell and the battery can be enhanced.

Description

Battery cell, battery and electronic equipment

Technical Field

The disclosure relates to the technical field of batteries, in particular to a battery core, a battery and electronic equipment.

Background

In the related art, the electronic product needs to obtain cruising ability by using the electric quantity of the battery, and the quick charging function of the battery in the using process can improve the charging efficiency, thereby being beneficial to providing better user experience.

However, the fast charge implementation scheme also has high requirements on the electrode material of the battery, which increases the manufacturing cost of the battery, and thus how to balance the fast charge efficiency, the cycle life and the manufacturing cost of the battery becomes a hot issue in current field research.

SUMMERY OF THE UTILITY MODEL

The present disclosure provides a battery cell, a battery and an electronic device, so as to improve the charging efficiency and the cycle life of the battery, and reduce the manufacturing cost.

A first aspect of the present disclosure provides a battery cell, including:

a positive electrode;

the first negative electrode comprises a first base layer and first active layers, the first active layers are arranged on two sides of the first base layer, and the material of the at least one first active layer comprises a quick-charging functional material;

and a separator, the positive electrode and the first negative electrode being disposed on both sides of the separator.

Optionally, the quick-charging functional material includes a silicon carbide-coated silicon-based negative electrode material.

Optionally, the battery cell further includes a second negative electrode, where the second negative electrode includes a second base layer and second active layers disposed on two sides of the second base layer; the positive electrode and the second negative electrode are arranged on two sides of the diaphragm; wherein, the material of the second active layer comprises basic functional material.

Optionally, the basic functional material comprises graphite.

Optionally, the battery cell includes a laminated structure, an anode assembly site or a cathode assembly site that is alternately arranged is formed between two adjacent separators, and the first cathode and the second cathode are alternately arranged in the cathode assembly site.

Optionally, adjacent membranes are connected to form an integral structure.

Optionally, the battery cell includes a winding structure, an anode assembly site or a cathode assembly site that is alternately arranged is formed between two adjacent separators, and the cathode assembly sites are provided with the first cathodes.

Optionally, the material of the first active layer disposed on one side of the first base layer includes a silicon-based negative electrode material coated with silicon carbide, and the material of the first active layer disposed on the other side of the first base layer includes graphite.

According to a second aspect of the present disclosure, there is provided a battery comprising any one of the cells of the first aspect.

According to a third aspect of the present disclosure, there is provided an electronic device comprising: any of the cells of the first aspect; or, the battery of the second aspect.

The technical scheme provided by the disclosure can at least achieve the following beneficial effects:

this electric core of disclosure includes at least one first negative pole, and the material of at least one first active layer of first negative pole is including filling the functional material soon for first negative pole possesses the function of filling soon, helps promoting the efficiency of filling soon of electric core, cycle life and the state of charge in the charging process, can strengthen the safety in utilization of electric core and battery simultaneously.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Fig. 1 is a schematic structural diagram of a battery cell in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural view of a first negative electrode in an exemplary embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a battery cell in another exemplary embodiment of the present disclosure;

fig. 4 is a schematic view of a second negative electrode in an exemplary embodiment of the present disclosure;

fig. 5 is a schematic perspective view of a laminated cell according to an exemplary embodiment of the disclosure;

fig. 6 is a schematic structural diagram of a battery cell in a further exemplary embodiment of the present disclosure;

fig. 7 is a schematic perspective structure diagram of a winding structure cell in an exemplary embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure.

The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein should have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Similarly, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and if only "a" or "an" is denoted individually. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "back", "lower" and/or "upper", "top", "bottom", and the like are for convenience of description only and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

In the related art, the electronic product needs to obtain cruising ability by using the electric quantity of the battery, and the quick charging function of the battery in the using process can improve the charging efficiency, thereby being beneficial to providing better user experience. However, the implementation of the rapid charging also requires high requirements for the electrode material of the battery, resulting in an increase in the manufacturing cost of the battery.

The present disclosure provides a battery cell, fig. 1 is a schematic structural diagram of a battery cell in an exemplary embodiment of the present disclosure, and as shown in fig. 1, the battery cell 1 includes a positive electrode 12, a separator 11, and at least one first negative electrode 13, where the positive electrode 12 and the first negative electrode 13 are disposed on two sides of the separator 11. The first negative electrode 13 includes a first base layer 131 and first active layers 132, the first active layers 132 are disposed on two sides of the first base layer 131, and at least one of the first active layers 132 includes a fast-charging functional material.

Because the battery cell 1 includes at least one first negative electrode 13, and the material of the at least one first active layer 132 of the first negative electrode 13 includes the fast charging functional material, the first negative electrode 13 has the fast charging function, which is helpful to improve the fast charging efficiency, the cycle life and the charge state of the battery cell 1 in the charging process, and can enhance the safety of the battery cell 1 and the battery.

It should be noted that, the quick charge functional material may be a silicon carbide coated silicon-based negative electrode material (si @ sic @ c), so that the energy density of the first negative electrode 13 is increased, which is helpful to improve the quick charge efficiency and the cycle life of the battery cell 1 and the state of charge of the battery cell in the charging process, and can enhance the safety of the battery cell 1 and the battery.

In some embodiments, as shown in fig. 2, the material of the first functional layer first active layer 132 on one side of the first base layer 131 of the first negative electrode 13 is a silicon-based negative electrode material coated with silicon carbide, and the material of the first functional layer first active layer 132 on the other side of the first base layer 131 is graphite, so that the usage amount of the silicon-based negative electrode material coated with silicon carbide is reduced, and thus the energy density of the battery cell 1 is increased while the overall cost of the battery cell 1 is reduced.

In other embodiments, the materials of the first active layers 132 on both sides of the first base layer 131 of the first negative electrode 13 are silicon carbide-coated silicon-based negative electrode materials, so that the first negative electrode 13 with double content of the silicon carbide-coated silicon-based negative electrode materials is formed, which is helpful for further increasing the energy density of the battery cell 1.

In the above embodiment, the battery cell 1 may include any one of the first negative electrodes 13, or may include both of the first negative electrodes 13, so as to improve the capacity density of the battery cell 1 through the structural improvement of the first negative electrode 13, and further obtain a higher charging speed.

In some embodiments, as shown in fig. 3, fig. 4, and fig. 5, the battery cell 1 may further include a second negative electrode 14, the second negative electrode 14 includes a second base layer 141 and a second active layer 142 disposed on two sides of the second base layer 141, the positive electrode 12 and the second negative electrode 14 are disposed on two sides of the separator 11, and a material of the second active layer includes a basic functional material, so as to obtain a basic negative electrode function. That is, the battery cell 1 includes the first negative electrode 13 and the second negative electrode 14, and the first negative electrode 13 and the second negative electrode 14 are distributed in a matching manner of two types of negative electrodes with different functional layers, so that the battery cell 1 can have advantages of the first negative electrode 13 and the second negative electrode 14, and the overall performance of the battery cell 1 is improved.

Wherein the basic functional material may be graphite. The energy density of the battery cell 1 can be improved by the first negative electrode 13 formed by coating the silicon-based negative electrode material with at least one first active layer 132, and the manufacturing cost of the battery cell 1 can be coordinated by the second negative electrode 14 formed by coating the graphite with the second active layer 142, so that the battery cell 1 has two effects of improving the energy density and reducing the manufacturing cost.

Because the conventional charging rate is less than 3C, the performance requirements of the lithium ion battery can be met by the second negative electrode 14 made of graphite as the second active layer 142 and the first negative electrode 13 made of silicon-based negative electrode material coated with silicon carbide as the first active layer 132. However, when high-rate charging, i.e., rapid charging, occurs, the first negative electrode 13 made of the silicon-carbide-coated silicon-based negative electrode material of the first active layer 132 can exert its high energy density, thereby effectively meeting the high-rate charging requirement.

The second negative electrode 14 made of graphite as the second active layer 142 is a conventional negative electrode material, and has low cost and good cycling stability. The material of the first active layer 132 includes silicon carbide coated silicon-based negative electrode material with high specific capacity, so that the charging time can be shortened, and the charging state can be improved. First negative pole 13 can also charge under the prerequisite that promotes at the multiplying power, does not harm the cycling performance under the multiplying power charges, solves the lithium problem of separating out at the negative pole interface that fills soon, guarantees the security performance. The structure that the first negative electrode 13 and the second negative electrode 14 are stacked comprehensively is adopted, so that the cost can be effectively reduced on the premise of meeting the quick charging requirement.

The battery cell 1 may have a laminated structure or a wound structure, and the present disclosure does not limit this.

The battery cell 1 includes a laminated structure. When the battery core 1 is a laminated structure, an anode 12 assembly position or a cathode assembly position is formed between two adjacent separators 11, and a first cathode 13 and a second cathode 14 are alternately arranged at the cathode assembly position. By the alternating arrangement of the first negative electrodes 13 and the second negative electrodes 14, the first negative electrodes 13 and the second negative electrodes 14 can be uniformly distributed in the laminated structure of the battery cell 1, which helps to improve the energy density uniformity of each part of the battery cell 1.

In other embodiments, at least two first cathodes 13 disposed at adjacent cathode assembly positions or at least two second cathodes 14 disposed at adjacent cathode assembly positions may also be included, and the number and distribution of the first cathodes 13 and the second cathodes 14 in the stacked structure are not limited in the present disclosure. For example, the number of the first negative electrodes 13 may be greater than that of the second negative electrodes 14, so as to increase the proportion of the silicon carbide-coated silicon-based negative electrode material in the negative electrode material and improve the energy density of the battery cell 1. For another example, the first number of first negative electrodes 13 and the second number of second negative electrodes 14 may be alternately disposed at the negative electrode assembling site. Wherein, the first number may be twice as large as the second number to increase the energy density of the battery cell 1. Alternatively, the first number and the second number may be in other proportional relationships, and the disclosure is not limited thereto.

In the above embodiment, the adjacent separators 11 are connected to form an integrated structure, so as to improve the molding convenience of the separators 11 and the battery cells 1 and the assembling convenience of the first negative electrodes 13 and/or the second negative electrodes 14. In the process of obtaining the lamination structure of the battery cell 1, the diaphragm 11 is folded in a preset area to obtain a negative electrode assembly position and a positive electrode 12 assembly position, and then the positive electrode 12 is assembled at the corresponding positive electrode 12 assembly position, and the first negative electrode 13 and the second negative electrode 14 are assembled at the corresponding negative electrode assembly position, so that the processing and manufacturing and the assembly of the positive electrode 12 and the negative electrode are facilitated.

In some embodiments, the battery cell 1 includes a wound structure. As shown in fig. 6 and 7, when the battery cell 1 is in a winding structure, positive electrode 12 assembly positions or negative electrode assembly positions are alternately formed between two adjacent separators 11, and each negative electrode assembly position is provided with a first negative electrode 13. Through the structure, the performance of the negative electrode of the battery cell 1 after winding can be ensured, and the overall energy density of the wound battery cell 1 is improved.

In the process of obtaining the winding structure of the battery cell 1, a first cathode 13 is arranged at a cathode assembly position on one side of the diaphragm 11, a cathode 12 is arranged at a cathode 12 assembly position on the other side of the diaphragm 11, and the stack layer formed by the diaphragm 11, the first cathode 13 and the cathode 12 is wound, molded and fixed. The stack may be secured by tape 16 after roll forming.

In the above embodiment, the material of the first active layer 132 on one side of the first base layer 131 of the first negative electrode 13 is silicon carbide coated silicon-based negative electrode material, and the material of the first active layer 132 on the other side of the first base layer 131 is graphite, so that the amount of silicon carbide coated silicon-based negative electrode material is reduced, and thus the energy density of the battery cell 1 is improved and the overall cost of the battery cell 1 is reduced.

And/or the materials of the first active layers 132 on both sides of the first base layer 131 of the first negative electrode 13 are silicon carbide-coated silicon-based negative electrode materials, so that the first negative electrode 13 with double content of the silicon carbide-coated silicon-based negative electrode materials is formed, thereby contributing to further increasing the energy density of the battery cell 1.

In the above-described embodiment, the cathode 12, the first anode 13, and the second anode 14 may be provided with the tabs 15, respectively.

The present disclosure further provides a battery including the above-described electric core 1.

Because electric core 1 includes at least one first negative pole 13, the material of at least one first active layer 132 of first negative pole 13 includes the functional material that charges soon for first negative pole 13 possess the function of charging soon, help promoting the efficiency of charging soon of electric core 1, battery, can strengthen the safety in utilization of electric core 1, battery simultaneously.

The battery may be a lithium ion battery, and the battery may be applied to electronic devices such as a mobile phone, a tablet computer, a vehicle-mounted terminal, and a wearable device, which is not limited in the present disclosure.

The present disclosure further provides an electronic device, comprising: the above battery cell 1 or the above battery.

Because the battery cell 1 includes at least one first negative electrode 13, the material of the at least one first active layer 132 of the first negative electrode 13 includes a fast charging functional material, so that the first negative electrode 13 has a fast charging function, thereby facilitating the promotion of the fast charging efficiency and the cycle life of the battery cell 1, the battery and the electronic device using the battery cell 1 or the battery, and simultaneously enhancing the safety of the battery cell 1, the battery and the electronic device using the battery cell 1 or the battery.

The electronic device may be an electronic device such as a mobile phone, a tablet computer, a vehicle-mounted terminal, and a wearable device, which is not limited in the disclosure.

The above description is meant to be illustrative of the preferred embodiments of the present disclosure and not to be taken as limiting the disclosure, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.

Claims (10)

1. An electrical core, comprising:

a positive electrode;

the first negative electrode comprises a first base layer and first active layers, the first active layers are arranged on two sides of the first base layer, and the material of the at least one first active layer comprises a quick-charging functional material;

a separator, the positive electrode and the first negative electrode being disposed on both sides of the separator.

2. The battery cell of claim 1, wherein the fast-charging functional material comprises a silicon carbide coated silicon-based negative electrode material.

3. The battery cell of claim 1, further comprising a second negative electrode comprising a second base layer and second active layers disposed on both sides of the second base layer; the positive electrode and the second negative electrode are arranged on two sides of the diaphragm; wherein, the material of the second active layer comprises basic functional material.

4. The electrical core of claim 3, wherein the base functional material comprises graphite.

5. The battery cell of claim 3, wherein the battery cell comprises a laminated structure, positive electrode assembly positions or negative electrode assembly positions are formed between two adjacent separators, and the first negative electrodes and the second negative electrodes are alternately arranged in the negative electrode assembly positions.

6. The cell of claim 5, wherein adjacent membranes are joined to form a unitary structure.

7. The battery core of claim 1, wherein the battery core comprises a winding structure, and two adjacent separators form positive electrode assembly positions or negative electrode assembly positions which are alternately arranged, and the negative electrode assembly positions are provided with the first negative electrodes.

8. The battery cell of claim 1, wherein the first active layer disposed on one side of the first base layer is made of a silicon carbide-coated silicon-based negative electrode material, and the first active layer disposed on the other side of the first base layer is made of graphite.

9. A battery comprising the cell of any of claims 1-8.

10. An electronic device, comprising:

the cell of any of claims 1-8;

or, a battery as claimed in claim 9.

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