Battery cell structure, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell structure, a battery and electric equipment. Wherein the battery cell structure comprises a first pole piece, a second pole piece, a diaphragm and a first insulating part; the second pole piece, the diaphragm and the first pole piece are sequentially stacked and wound to form a winding body; the first insulating part is arranged at the side end of the second pole piece and / or the side end of the first pole piece; and the first insulating part at least can extend to the side end surface of the outermost layer of the winding body. According to the utility model, the use safety and stability can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery core structure, a battery and electrical equipment. Background Art

[0002] Currently, 3C products are all developing towards high ED (energy density), and to achieve this, the battery cell structure is designed to be more compact. After the positive and negative current collectors of the battery cell are pressed together, sharp corners are formed at the edges along the width of the battery cell. These sharp corners increase the probability of contact between the anode at the corner of the outer ring of the silicon negative electrode battery and the aluminum layer of the aluminum-plastic film. This contact can cause electrochemical corrosion. Once the aluminum layer is corroded, moisture can enter, causing problems such as battery cell bulging and leakage, thereby reducing stability and safety. Utility Model Content

[0003] The purpose of the present invention is to provide a battery core structure to solve the above-mentioned technical problems of stability and safety in use in view of the deficiencies in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A battery cell structure comprises a first pole piece, a second pole piece, a diaphragm and a first insulating component; the first pole piece, the diaphragm and the second pole piece are stacked in sequence and wound to form a winding body;

[0006] The diaphragm has a main body and an edge portion; in the length direction of the wound body, the edge portion exceeds the first pole piece and / or the second pole piece; at the corner section of the wound body, the first insulating component is connected to the edge portion.

[0007] Preferably, the thickness L1 of the first insulating component satisfies the following range: 5um≤L1≤100um.

[0008] Preferably, in the corner section of the wound body, the projection of the first pole piece toward the first insulating component is arranged inside the first insulating component; and / or the first insulating component can be extended to one side end of the first pole piece;

[0009] And / or, in the corner section of the winding body, the projection of the second pole piece toward the first insulating component is arranged in the first insulating component; and / or, the first insulating component can be extended to one side end of the second pole piece.

[0010] Preferably, the relationship among the thickness L0 of the wound body, the thickness L1 of the first insulating component, and the thickness L2 of all the diaphragms in the corner section satisfies: L0-L2≤L1≤L0.

[0011] Preferably, the winding body also includes a starting section, a tail section and at least one straight section; and the number of the corner sections is at least two; the starting section is arranged at the innermost end of the winding body; the tail section is arranged at the outermost end of the winding body; the straight sections and the corner sections are staggered with each other; one of the corner sections is connected to the starting section; the other corner section is connected to the tail section; and the projection of the first insulating component toward the winding body is staggered with the tail section in the winding body.

[0012] Preferably, the first insulating component includes a bent section; in a thickness direction of the wound body, the bent section is provided between at least two adjacent edge portions.

[0013] Preferably, the first insulating component includes a horizontal section; the horizontal section is connected to the bent section; along the length direction of the winding body, part of the structure in the horizontal section extends to the straight section; and along the thickness direction of the winding body, the horizontal section is arranged between at least two adjacent edge portions.

[0014] Preferably, the battery cell structure further includes a second insulating component; the second insulating component is arranged between the tail section and the straight section of the outermost layer; and / or the second insulating component is arranged between the two straight sections of the outermost layer.

[0015] The utility model also discloses a battery, comprising the above-mentioned battery core structure.

[0016] The utility model also discloses an electrical device, comprising the battery described above.

[0017] The beneficial effect of the present invention is that the technical solution can effectively block the direct contact between the outermost winding body and the aluminum-plastic film by adopting the first insulating component to insulate and separate the corner sections of the battery cell and connect them together, and can also improve the assembly stability between the diaphragms in the corner sections, thereby effectively reducing the electrochemical corrosion of one or all of the winding body and the aluminum-plastic film, reducing the shrinkage of the diaphragm during heating and falling, and preventing the positive and negative electrodes from short-circuiting; thereby improving the safety performance of the battery cell; and effectively avoiding the problems of swelling and leakage of the battery cell caused by water vapor entering after the aluminum-plastic film is corroded; thereby improving the safety and stability of use, and improving the overall flatness through the insulating separation effect of the side ends, which can reduce costs to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 invention.

[0019] Figure 1 This is a schematic diagram of the overall structure of a battery cell structure according to an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of a battery cell structure according to an embodiment of the present invention;

[0021] Figure 3 A cross-sectional view of a battery cell structure according to an embodiment of the present invention.

[0022] In the figure: 1-first pole piece; 11-first pole tab; 2-second pole piece; 21-second pole tab; 3-first insulating component; 31-bending section; 32-horizontal section; 4-winding body; 5-second insulating component; 51-first green glue; 52-second green glue; 6-diaphragm; 601-main body; 602-edge portion; 71-starting section; 72-straight section; 73-corner section; 74-ending section. DETAILED DESCRIPTION

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0024] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0025] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or multiple situations exist. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0027] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0028] The following is combined with Figures 1 to 3 The present invention is further described in detail, but is not intended to limit the present invention.

[0029] like Figure 1 and 2 As shown, in one embodiment of the present invention, the battery cell structure includes a first pole piece 1, a second pole piece 2, a diaphragm 6 and a first insulating component 3; the first pole piece 1, the diaphragm 6 and the second pole piece 2 are stacked in sequence and wound to form a winding body 4; and the outermost layer of the second pole piece 2 is the outermost layer of the winding body 4; the diaphragm 6 has a main body 601 and an edge portion 602; in the length direction of the winding body 4, the edge portion 602 exceeds the first pole piece 1 and / or the second pole piece 2; at the corner section 73 of the winding body 4, the first insulating component 3 is connected to the edge portion 602.

[0030] The second electrode 2 is an anode and the first electrode 1 is a cathode; or the second electrode 2 is a cathode and the first electrode 1 is an anode. Preferably, the second electrode 2 is an anode and the first electrode 1 is a cathode.

[0031] The technical solution of the present invention adopts the first insulating component to insulate and separate the corner sections of the battery cell and connect them together, which can effectively block the outermost winding body from direct contact with the aluminum-plastic film, and can also improve the assembly stability between the diaphragms in the corner sections, thereby effectively reducing the electrochemical corrosion of one or all of the winding body and the aluminum-plastic film, reducing the shrinkage of the diaphragm during heating and falling, and preventing the positive and negative electrodes from short-circuiting; thereby improving the safety performance of the battery cell; and effectively avoiding the problems of swelling and leakage of the battery cell caused by water vapor entering after the aluminum-plastic film is corroded; thus improving the safety and stability of use, and improving the overall flatness through the insulating separation effect of the side ends, which can reduce costs to a certain extent.

[0032] Wherein, in some embodiments, Figure 1As shown, the second pole piece 2 is provided with a second pole tab 21 , and one side end of the second pole tab 21 is arranged through the winding body 4 ; the first pole piece 1 is provided with a first pole tab 11 , and one side end of the first pole tab 11 is arranged through the winding body 4 .

[0033] Specifically, in some embodiments, Figure 2 and 3 As shown, the jellyroll 4 includes a starting section 71, a tail section 74, and at least one straight section 72; there are at least two corner sections 73; the starting section 71 is located at the innermost end of the jellyroll 4; the tail section 74 is located at the outermost end of the jellyroll 4; the straight sections 72 and the corner sections 73 are staggered; one corner section 73 is connected to the starting section 71; the other corner section 73 is connected to the tail section 74; and the projection of the first insulating component 3 toward the jellyroll 4 is offset from the tail section 74. The second pole piece 2 (anode piece) is located at the outermost layer of the side end of the jellyroll 4. That is, the operation of sticking green glue on the side of the tail side is eliminated; however, this structure can eliminate the traditional setting of green glue on the non-tail side, and use the first insulating component 3 to apply glue or spray glue on the side end of the side corner section 73, and then roll it into shape and then process it at the non-tail side corner; thereby protecting the anode sheet on the side to avoid electrochemical corrosion, thereby improving the safety and stability of use.

[0034] Specifically, in some embodiments, such as Figure 3 As shown, the first insulating component 3 includes a bent section 31; along the thickness direction of the wound body 4, the bent section 31 is disposed between at least two adjacent edge portions 602. In other words, this structure utilizes dispensing or spraying of glue at the side corner sections 73, and then performs preliminary treatment at the non-end corners after winding. This effectively protects the side anode sheets from electrochemical corrosion, thereby improving safety and stability.

[0035] Specifically, in other embodiments, Figure 2 and 3As shown, the first insulating component 3 includes a bend section 31 and a horizontal section 32 that are interconnected. Along the thickness direction of the wound body 4, the bend section 31 is positioned between at least two adjacent edge portions 602. The horizontal section 32 is connected to the bend section 31. Along the length direction of the wound body 4, a portion of the horizontal section 32 extends to the straight section 72. Furthermore, along the thickness direction of the wound body 4, the horizontal section 32 is positioned between at least two adjacent edge portions 602. This structure, with the bend section 31 located at the corner section 73 and the horizontal section 32 located at the straight section 72, increases the insulation coverage area, thereby better preventing electrochemical corrosion and improving safety and stability.

[0036] Specifically, in some embodiments, Figure 3 As shown, the thickness L1 of the first insulating component 3 satisfies the following range: 5 μm ≤ L1 ≤ 100 μm. This structure effectively ensures the assembly stability of the wound body 4 by using the first insulating component 3 of appropriate thickness but not limited in shape, and can also protect the side anode sheet to prevent electrochemical corrosion.

[0037] Specifically, in some embodiments, Figure 1 and 2 As shown, in the corner section 73 of the wound body 4, the projection of the first pole piece 1 toward the first insulating component 3 is disposed within the first insulating component 3; and / or the first insulating component 3 can extend to one side end of the first pole piece 1. In other words, because the width of the diaphragm 6 is relatively larger than that of the first pole piece 1 or the second pole piece 2, the first insulating component 3 can be connected to the gap between the two adjacent edge portions 602 and the first pole piece 1, and the first pole piece 1 can abut against the first insulating component 3 or be separated from the first insulating component 3, thereby reducing diaphragm shrinkage during heating and dropping, preventing contact and short circuit between the positive and negative pole pieces, and thereby improving the safety performance of the battery cell.

[0038] Specifically, in some embodiments, Figure 1 and 2As shown, in the corner section 73 of the wound body 4, the projection of the second pole piece 2 toward the first insulating component 3 is disposed within the first insulating component 3; and / or the first insulating component 3 can extend to one side end of the second pole piece 2. In other words, because the width of the diaphragm 6 is relatively larger than that of the first pole piece 1 or the second pole piece 2, the first insulating component 3 can be connected to the gap between the two adjacent edge portions 602 and the second pole piece 2, and the second pole piece 2 can abut against the first insulating component 3 or be separated from the first insulating component 3, thereby reducing diaphragm shrinkage during heating and dropping, preventing contact and short circuit between the positive and negative pole pieces, and thereby improving the safety performance of the battery cell.

[0039] Specifically, in some embodiments, Figure 3 As shown, the relationship between the thickness L0 of the jellyroll 4, the thickness L1 of the first insulating component 3, and the thickness L2 of all the separators 6 in the corner section 73 satisfies the following: L0-L2≤L1≤L0. That is, the first insulating component 3 can be installed only in the gap between two adjacent edge portions 602 and the second electrode 2, or only in the gap between two adjacent edge portions 602 and the first electrode 1; or it can completely cover the corner section 73. This structure reduces separator shrinkage during heating and dropping, preventing contact and short circuits between the positive and negative electrode sheets. This effectively ensures the assembly stability of the jellyroll 4 and protects the anode sheet on the side to prevent electrochemical corrosion.

[0040] Specifically, in some embodiments, the first insulating component 3 is an insulating adhesive member, wherein the insulating adhesive member is selected from polyisoprene or polyurethane. This structure is achieved by dispensing or spraying glue on the side ends of the wound body 4; the glue spraying material is mainly polyisoprene or polyurethane (viscous) material that does not react with the electrolyte. This can separate the outermost second electrode piece 2 or first electrode piece 1 from the aluminum-plastic film, thereby preventing electrochemical corrosion.

[0041] Specifically, in some embodiments, Figure 1 and 2 As shown, the cell structure further includes a second insulating component 5; the second insulating component 5 is disposed between the tail section 74 and the outermost straight section 72; and / or the second insulating component 5 is disposed between the two outermost straight sections 72. Figure 1 、 2 As shown in FIG. 3 , the second insulating component 5 includes a first green glue 51 and a second green glue 52 ; the first green glue 51 is arranged between the tail section 74 and the outermost straight section 72 ; the second green glue 52 is arranged between the two outermost straight sections 72 .

[0042] The present invention also proposes a battery, which includes a cell structure. The specific structure of the cell structure refers to the above-mentioned embodiment. Since the present 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] The present utility model also proposes an electrical device, which includes a battery. The specific structure of the battery refers to the above embodiments. 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.

[0044] Among them, electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 methods that can be understood by those skilled in the art.

[0046] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention fall within the scope of protection of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience only and do not constitute any limitation on the present invention.

Claims

1. A battery cell structure, characterized in that: The invention comprises a first pole piece, a second pole piece, a diaphragm and a first insulating component; the first pole piece, the diaphragm and the second pole piece are stacked in sequence and wound to form a winding body; The diaphragm has a main body and an edge portion; in the length direction of the wound body, the edge portion exceeds the first pole piece and / or the second pole piece; at the corner section of the wound body, the first insulating component is connected to the edge portion.

2. The battery cell structure according to claim 1, wherein: The thickness L1 of the first insulating component satisfies the following range: 5um≤L1≤100um.

3. The battery cell structure according to claim 1, wherein: In the corner section of the wound body, the projection of the first pole piece toward the first insulating component is arranged inside the first insulating component; and / or the first insulating component can be extended to a side end of the first pole piece; And / or, in the corner section of the winding body, the projection of the second pole piece toward the first insulating component is arranged in the first insulating component; and / or, the first insulating component can be extended to one side end of the second pole piece.

4. The battery core structure according to claim 1 or 2, characterized in that: The relationship among the thickness L0 of the wound body, the thickness L1 of the first insulating component, and the thickness L2 of all the separators in the corner section satisfies: L0-L2≤L1≤L0.

5. The battery core structure according to claim 1 or 3, characterized in that: The winding body also includes a starting section, a tail section and at least one straight section; and the number of the corner sections is at least two; the starting section is arranged at the innermost end of the winding body; the tail section is arranged at the outermost end of the winding body; the straight sections and the corner sections are staggered with each other; one of the corner sections is connected to the starting section; the other corner section is connected to the tail section; and the projection of the first insulating component toward the winding body is staggered with the tail section in the winding body.

6. The battery cell structure according to claim 5, characterized in that: The first insulating component includes a bent section; in a thickness direction of the wound body, the bent section is provided between at least two adjacent edge portions.

7. The battery cell structure according to claim 6, characterized in that: The first insulating component includes a horizontal section; the horizontal section is connected to the bent section; along the length direction of the winding body, part of the structure in the horizontal section extends to the straight section; and along the thickness direction of the winding body, the horizontal section is arranged between at least two adjacent edge portions.

8. The battery cell structure according to claim 5, characterized in that: The battery core structure further includes a second insulating component; the second insulating component is arranged between the tail section and the outermost straight section; and / or the second insulating component is arranged between the two outermost straight sections.

9. A battery, characterized in that: The battery cell structure comprises the battery cell structure according to any one of claims 1 to 8.

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

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