CN221057483U

CN221057483U - Electrode assembly, battery and electric equipment

Info

Publication number: CN221057483U
Application number: CN202322603867.3U
Authority: CN
Inventors: 李腾; 武冬冬; 李恺; 郑明清; 项海标
Original assignee: Zhejiang Lixin Energy Technology Co ltd
Current assignee: Zhejiang Lixin Energy Technology Co ltd
Priority date: 2023-09-25
Filing date: 2023-09-25
Publication date: 2024-05-31
Anticipated expiration: 2033-09-25

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to an electrode assembly, a battery and electric equipment; wherein the electrode assembly comprises a first pole piece and a second pole piece with opposite polarities, and a separation film arranged between the first pole piece and the second pole piece; the first pole piece, the second pole piece and the isolating film are wound to form a winding structure; the first pole piece comprises a surrounding connecting section and an initial connecting section which are connected with each other; one end of the initial connecting section, which is far away from the surrounding connecting section, is provided with a supporting part; the supporting component is provided with an adsorption structure. The utility model can improve the use safety and the structural stability.

Description

Electrode assembly, battery and electric equipment

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to an electrode assembly, a battery and electric equipment.

Background

The winding electrode assembly is a common cell structure of a battery, and consists of a positive electrode plate, a negative electrode plate and a separation film, wherein positive and negative electrodes in the cell are led out by a positive electrode lug and a negative electrode lug, and electrolyte is filled in the battery to be in contact with active substances on the electrode plate.

In the winding technology of the existing winding electrode assembly, the problems of poor winding core circularity, crisp chips, difficult liquid absorption and the like of the pole piece easily occur in the winding process due to thick and hard pole piece; thus resulting in poor structural stability of the electrode assembly and unfavorable for the circulation of the electrolyte in the later stage.

Disclosure of utility model

The utility model aims at: in view of the shortcomings of the prior art, an electrode assembly is provided for improving the use safety and structural stability.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

An electrode assembly comprising first and second electrode sheets of opposite polarity and a separator disposed between the first and second electrode sheets; the first pole piece, the second pole piece and the isolating film are wound to form a winding structure;

The first pole piece comprises a surrounding connecting section and an initial connecting section which are connected with each other; one end of the initial connecting section, which is far away from the surrounding connecting section, is provided with a supporting part; the supporting component is provided with an adsorption structure.

Preferably, the supporting component is one of teflon, swelling glue and PTE film.

Preferably, the support member comprises a first support section and a second support section connected to the first support section; the first support section is connected to the surface of the initial connecting section; the second support section is connected to the side end of the initial connecting section and is arranged opposite to the surrounding connecting section; and the second support section is arranged in an extending way away from the side end of the initial connecting section.

Preferably, a relation between the length L1 of the first support section and the length L2 of the second support section satisfies: l2 > L1.

Preferably, a relation between the thickness H1 of the support member and the thickness H2 of the first pole piece satisfies: h2 =aχh1; wherein A is 4-6.

Preferably, a relation between the thickness H2 of the first pole piece and the thickness H3 of the second pole piece satisfies: h2 > H3.

Preferably, the adsorption structure includes a first adsorption hole provided along a radial direction of the support member; and the first adsorption hole communicates with the outside of the electrode assembly.

Preferably, the adsorption structure further comprises a second adsorption hole, and the diameter direction of the second adsorption hole intersects with the diameter direction of the first adsorption hole.

The utility model also discloses a battery, which comprises the electrode assembly.

The utility model also discloses electric equipment comprising the battery.

The utility model has the beneficial effects that the supporting part is adopted in the technical scheme, so that the first pole piece can maintain better circularity in the winding process, thereby effectively reducing the winding curvature, and simultaneously, the stress applied to the first pole piece in the winding process can be buffered, thereby ensuring the circularity of the electrode assembly and improving the use safety and structural stability; meanwhile, the adsorption structure is also beneficial to improving the liquid absorption capacity of the electrode assembly through the adsorption effect of the adsorption structure on the subsequent electrolyte, fully and reasonably utilizes the electrolyte, avoids the phenomena of cycle deterioration and the like of the electrode assembly, and can improve the use safety and the structural stability.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to fig. 1 to 3.

Fig. 1 is a schematic view illustrating a structure of an electrode assembly according to an embodiment of the present utility model;

Fig. 2 is a schematic view illustrating a structure of an electrode assembly according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a support member of an electrode assembly according to an embodiment of the present utility model.

In the figure: 1-a first pole piece; 11-encircling the connection section; 12-an initial connection segment; 2-a second pole piece; 3-a separation membrane; 4-a support member; 41-a first support section; 42-a second support section; 43-adsorption structure; 431-first adsorption hole; 432-second adsorption hole.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship of an electrode assembly, a battery, and a powered device describing an associated object, and indicates that three relationships may exist, for example, a and/or B may indicate: a alone, both a and B, and a plurality of cases alone. In addition, the character "/" herein generally indicates that the front-rear associated object is an or relationship of an electrode assembly, a battery, and a powered device.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 3, but the present utility model is not limited thereto.

As shown in fig. 1, in an embodiment of the present utility model, the electrode assembly; the device comprises a first pole piece 1 and a second pole piece 2 with opposite polarities, and an isolating film 3 arranged between the first pole piece 1 and the second pole piece 2; the first pole piece 1, the second pole piece 2 and the isolating film 3 are wound along the winding direction to form a winding structure; the first pole piece 1 comprises a surrounding connecting section 11 and a starting connecting section 12 which are connected with each other; the end of the initial connecting section 12, which is far away from the surrounding connecting section 11, is provided with a supporting part 4; the support member 4 is provided with an adsorption structure 43.

According to the technical scheme, the supporting component is adopted, so that the first pole piece can maintain better circularity in the winding process, the winding curvature can be effectively reduced, the stress applied to the first pole piece in the winding process can be buffered, the circularity of the electrode assembly is further ensured, and the use safety and the structural stability are improved; meanwhile, the adsorption structure is also beneficial to improving the liquid absorption capacity of the electrode assembly through the adsorption effect of the adsorption structure on the subsequent electrolyte, fully and reasonably utilizes the electrolyte, avoids the phenomena of cycle deterioration and the like of the electrode assembly, and can improve the use safety and the structural stability.

In the winding process, the supporting part 4 is wound at first, and the supporting part is used for supporting and buffering deformation of the first pole piece, so that the first pole piece 1 can be ensured to maintain better circularity, the stability of the whole structure of the electrode assembly is improved, and the phenomena of fracture and the like of the first pole piece are avoided; when the electrode assembly of the battery is injected subsequently, the adsorption structure 43 can effectively adsorb electrolyte, so that the liquid absorption and liquid retention capacity of the electrode assembly are improved, and the cycle performance of the battery core is improved.

One of the first pole piece 1 and the second pole piece 2 is a cathode piece, and the other is an anode piece. In some embodiments, as shown in fig. 1, the first electrode sheet 1 is a cathode sheet including a cathode current collector and a cathode active material layer coated on a surface of the cathode current collector; the cathode active material in the cathode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc.; the second electrode sheet 2 is an anode sheet; the anode sheet comprises an anode current collector and an anode active material layer, and the anode active material layer is coated on the surface of the anode current collector; the anode active material in the anode active material layer may be carbon, graphite, or the like.

Specifically, in some embodiments, the support member 4 is one of a teflon paper, an intumescent glue, a PTE (polyethylene terephthalate) film. The supporting performance of the first pole piece 1 can be effectively guaranteed through one of the iron fluorine gummed paper, the expansion adhesive and the PTE (polyethylene terephthalate) film, the buffer effect of the first pole piece 1 and the second pole piece 2 after winding and forming can be realized, and the use safety and the structural stability are further improved. The iron fluorine adhesive tape is one of high-temperature adhesive tapes, and the temperature resistance is usually between 120 and 260 ℃.

Specifically, in some embodiments, as shown in fig. 2, the support member 4 includes a first support section 41 and a second support section 42 connected to the first support section 41; the first support section 41 is connected to the surface of the initial connecting section 12; the second supporting section 42 is connected to the side end of the initial connecting section 12 and is disposed opposite to the surrounding connecting section 11; and the second support section 42 is disposed in a side end extension away from the starter connection section 12. The connection stability between the support part 4 and the first pole piece 1 can be ensured by the connection of the first support section 41 and the initial connection section 12; and through the outward extension setting of second support section 42, can realize that certain length is in order to supply to support part 4 to carry out the coiling operation to improve the smoothness nature of coiling, and can also ensure electrode assembly's circularity, improve safety in utilization and structural stability.

Specifically, in some embodiments, as shown in fig. 2, the relationship between the length L1 of the first support section 41 and the length L2 of the second support section 42 satisfies: l2 > L1. Wherein, in some embodiments, l2=40 mm; l1=30 mm. By means of the relatively long second support section 42, a winding of a reasonable length of the support part 4 can be achieved, so that the first cathode sheet 1 is further effectively protected, and the use safety and the structural stability of the electrode assembly are further improved.

Specifically, in some embodiments, as shown in fig. 2, the relation between the thickness H1 of the support member 4 and the thickness H2 of the first pole piece 1 satisfies: h2 =aχh1; wherein A is 4-6. That is, the relation between the thickness H2 of the first support section 41 or the second support section 42 and the thickness H2 of the first pole piece 1 satisfies: h2 =aχh1; wherein A is 4-6. Wherein in some embodiments the thickness H2 of the first pole piece 1 is 0.224mm and the thickness H1 of the support member 4 is 0.05mm. The supporting buffering performance of winding can be guaranteed through the relatively thinner supporting component 4, the excessive thickness of the pole piece component after winding is completed can be avoided, and meanwhile, the supporting component 4 can be prevented from excessively adsorbing electrolyte.

Specifically, in some embodiments, as shown in fig. 2, the relation between the thickness H2 of the first pole piece 1 and the thickness H3 of the second pole piece 2 satisfies: h2 > H3. Wherein, in some embodiments, h2=0.224 mm; h3 =0.154 mm. In the winding process, the first pole piece 1 is wound first, so that the first pole piece 1 with relatively thicker thickness is required to avoid phenomena such as fracture in the winding process, the structural stability is improved, and the orderly winding is ensured.

In particular, in some embodiments, the front projection of the initial connecting section 12 coincides at most partially with the front projection of the second pole piece 2. As shown in fig. 2, there is no overlapping portion between the front projection of the initial connecting section 12 and the front projection of the second pole piece 2; that is, in the winding process, the support member 4 is first wound, then the initial connection section 12 is subjected to an independent winding process without the second pole piece 2, and finally the second pole piece 2 is introduced to achieve normal winding of the first pole piece 1 and the second pole piece 2, so that the winding stability of the electrode assembly can be ensured, and the structural stability of the electrode assembly can be improved.

Specifically, in some embodiments, as shown in fig. 2 and 3, the adsorption structure 43 includes a first adsorption hole 431, and the first adsorption hole 431 is disposed along the radial direction of the support member 4; and the first adsorption hole 431 communicates with the outside of the electrode assembly. Wherein the radial direction is a direction parallel to the surface of the first pole piece 1, i.e. the horizontal direction. The electrolyte can be rapidly introduced from the non-fitting surface of the support member 4 through the first adsorption holes 431, so that a higher liquid retention amount can be improved to promote the liquid retention capability in the process of cell circulation.

Specifically, in some embodiments, as shown in fig. 3, the adsorption structure 43 further includes a second adsorption hole 432, and the path direction of the second adsorption hole 432 intersects with the path direction of the first adsorption hole 431. Wherein, in some embodiments, the second adsorption hole 432 on the first support section 41 communicates with the first adsorption hole 431 on the first support section 41; because the first pole piece 1 and the second pole piece 2 are in contact with the two surfaces of the first supporting section 41, the volume for storing electrolyte is increased through the second adsorption holes 432, and further, the higher liquid retention capacity can be improved, so that the liquid retention capacity in the process of cell circulation is promoted. The second adsorption hole 432 on the second support section 42 is not in communication with the first adsorption hole 431 on the second support section 42; because at least one surface of the second supporting section 42 is not in sealing contact with the first pole piece 1 or the second pole piece 2, the volume for storing electrolyte is increased through the first adsorption holes and the second adsorption holes in different directions, and further, higher liquid retention capacity can be improved, so that the liquid retention capacity in the process of cell circulation is promoted.

The utility model also provides a battery, which comprises an electrode assembly, wherein the specific structure of the electrode assembly refers to the embodiment, and the battery adopts all the technical schemes of all the embodiments, so that the battery has at least all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.

Wherein, a Battery (Battery) refers to a device which contains electrolyte solution and metal electrode to generate current in a cup, a groove or other container or partial space of a composite container and can convert chemical energy into electric energy; the battery has a positive electrode and a negative electrode. With the advancement of technology, batteries generally refer to small devices capable of generating electrical energy, such as solar cells. The performance parameters of the battery are mainly electromotive force, capacity, specific energy and resistance. The battery principle: in a chemical cell, the direct conversion of chemical energy into electrical energy is a result of spontaneous oxidation, reduction, etc. chemical reactions within the cell, which are carried out on two electrodes, respectively. The negative electrode active material is composed of a reducing agent having a relatively negative potential and being stable in an electrolyte, such as an active metal of zinc, cadmium, lead, or the like, and hydrogen or a hydrocarbon, or the like. The positive electrode active material is composed of an oxidizing agent which is potential-corrected and stable in the electrolyte, such as metal oxides of manganese dioxide, lead dioxide, nickel oxide, etc., oxygen or air, halogen and salts thereof, oxy-acid and salts thereof, etc. The electrolyte is a material having good ionic conductivity, such as an aqueous solution of an acid, a base, a salt, an organic or inorganic nonaqueous solution, a molten salt, a solid electrolyte, or the like.

The utility model also provides electric equipment, which comprises a battery, and the specific structure of the battery refers to the embodiment, and because the electric equipment adopts all the technical schemes of all the embodiments, the electric equipment at least has all the beneficial effects brought by the technical schemes of the embodiments, and the specific structure of the battery is not repeated here.

The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecraft, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims

1. An electrode assembly, characterized in that: the device comprises a first pole piece and a second pole piece with opposite polarities, and an isolating film arranged between the first pole piece and the second pole piece; the first pole piece, the second pole piece and the isolating film are wound to form a winding structure;

2. The electrode assembly of claim 1, wherein: the supporting component is one of teflon paper, expansion glue and PTE film.

3. The electrode assembly of claim 1, wherein: the support component comprises a first support section and a second support section connected with the first support section; the first support section is connected to the surface of the initial connecting section; the second support section is connected to the side end of the initial connecting section and is arranged opposite to the surrounding connecting section; and the second support section is arranged in an extending way away from the side end of the initial connecting section.

4. An electrode assembly according to claim 3, wherein: the relation between the length L1 of the first support section and the length L2 of the second support section satisfies: l2 > L1.

5. An electrode assembly according to claim 1 or 3, wherein: the relation between the thickness H1 of the supporting component and the thickness H2 of the first pole piece satisfies the following formula: h2 =aχh1; wherein A is 4-6.

6. The electrode assembly of claim 1, wherein: the relation between the thickness H2 of the first pole piece and the thickness H3 of the second pole piece satisfies the following conditions: h2 > H3.

7. An electrode assembly according to claim 1 or 3, wherein: the adsorption structure comprises a first adsorption hole, wherein the first adsorption hole is arranged along the radial direction of the supporting part; and the first adsorption hole communicates with the outside of the electrode assembly.

8. The electrode assembly of claim 7, wherein: the adsorption structure further comprises a second adsorption hole, and the drift diameter direction of the second adsorption hole is intersected with the drift diameter direction of the first adsorption hole.

9. A battery, characterized in that: an electrode assembly comprising any one of claims 1 to 8.

10. An electrical consumer, characterized in that: comprising the battery of claim 9.