Winding battery cell structure and battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a winding battery cell structure and a battery. Wherein the winding cell structure comprises a winding cell body, and an anode lug and a cathode lug which are respectively connected to the winding cell body; the anode lug and / or the cathode lug comprise at least one first pole lug and at least one second pole lug; one end of the first tab is connected to the roll core body; one end of the second tab is connected to the roll core body; and the other end of the first tab is connected to the other end of the at least one second tab in a coating manner. According to the utility model, the stability of the structure and the operation efficiency of battery performance detection can be improved.

Description

Technical Field

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

[0002] With the development of the new energy industry, the application of lithium-ion batteries has been continuously expanded and widely used in electric vehicles, energy storage and other fields. Among them, the square aluminum shell battery with a multi-pole winding structure is one of the main products. The manufacturing process of the square aluminum shell battery with a multi-pole winding structure includes: stirring, coating, rolling, die cutting, slitting, winding, core pairing, core and connecting piece welding, connecting piece top cover welding, mylar packaging, shelling, top cover and aluminum shell welding, baking, primary liquid injection, formation, secondary liquid injection, sealing pin welding, capacity division, voltage and internal resistance testing, film coating, size measurement and other processes.

[0003] Among them, the welding process of the core and the connecting sheet requires that all the pole ears be welded to the adapter at the same time. At this time, the pole ears are prone to warping or folding during the operation, which will cause some pole ears in the core to not be completely welded to the adapter, thereby reducing the overcurrent area of ​​the battery cell, affecting the large current discharge of the battery and the battery life; thus causing instability and safety in use. Utility Model Content

[0004] The purpose of the utility model is to provide a wound battery core structure to improve the stability of the structure in view of the deficiencies of the prior art.

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

[0006] A wound battery core structure comprises a core body and an anode ear and a cathode ear respectively connected to the core body; the anode ear and / or the cathode ear comprises at least one first pole ear and at least one second pole ear; one end of the first pole ear is connected to the core body; one end of the second pole ear is connected to the core body; and the other end of the first pole ear is covered and connected to the other end of at least one second pole ear.

[0007] Preferably: the first pole ear includes a straight portion and a bent portion connected to one end of the straight portion; the other end of the straight portion is connected to the winding core body; the other end of the bent portion is bent toward the second pole ear; and the bent portion is covered and connected to the second pole ear.

[0008] Preferably: the anode ear and / or the cathode ear further comprises a plurality of ear units, the second ear abuts against the straight portion; the plurality of ear units are stacked on the second ear and away from the straight portion; the bent portion covers the second ear and the plurality of ear units, and the inner side surface of the bent portion abuts against the top of the second ear and the plurality of ear units.

[0009] Preferably: the first pole tab further includes a covering extension portion; the covering extension portion is connected to one end of the bending portion away from the straight portion; and the covering extension portion covers the second pole tab and the plurality of pole tab units.

[0010] Preferably, an inclination angle α is provided between the covering extension portion and the bending portion; wherein the value range of α is: 60 degrees ≤ α ≤ 90 degrees.

[0011] Preferably, the relationship between the height H3 of the straight portion and the height H2 of the bent portion satisfies: 1 / 3*H3≤H2≤H3.

[0012] Preferably, the relationship between the length L3 of the bent portion and the length L1 of the second electrode tab satisfies: L3>L1.

[0013] Preferably, the relationship between the length L2 of the straight portion and the length L1 of the second electrode tab satisfies: L2>L1.

[0014] Preferably, a relationship between a height H1 of the first electrode tab and a height H2 of the second electrode tab satisfies: H1>H2.

[0015] Preferably: the winding core body further comprises a separation film arranged between the anode sheet and the cathode sheet; the anode sheet, the separation film and the cathode sheet are wound in sequence to form a winding core structure.

[0016] The utility model also discloses a battery, comprising the wound cell structure and an outer shell, an anode column and a cathode column; the anode column and the cathode column are respectively connected to the inner top of the outer shell; and the anode column is connected to the anode ear; the cathode column is connected to the cathode ear.

[0017] The beneficial effect of the utility model lies in that the technical solution adopts the arrangement that the first pole ear in the anode ear and / or the cathode ear is covered with the second pole ear during use, thereby avoiding the second pole ear from being folded due to impact or other factors during use, thereby reducing the operation process of manually correcting the second pole ear during CCD and other detection processes, and can improve the stability of the structure and the operational efficiency of detecting battery performance, thereby improving product safety and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following will refer to the attached Figures 1 to 4 To describe the features, advantages and technical effects of exemplary embodiments of the present utility model.

[0019] Figure 1 A side view of a wound battery cell structure according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic structural diagram of a wound battery cell structure according to one embodiment of the utility model;

[0021] Figure 3 This is a structural schematic diagram of a wound battery cell structure in an unfolded state according to an embodiment of the utility model;

[0022] Figure 4 This is a schematic structural diagram of a wound battery cell structure according to another embodiment of the present invention.

[0023] In the figure: 1- winding core body; 2- first pole ear; 21- straight portion; 22- bent portion; 23- coated extension portion; 3- second pole ear; 4- anode ear; 5- cathode ear; 6- pole ear unit. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship between the wound cell structure, battery, and electrical equipment to describe the associated objects, indicating that three relationships may exist. For example, A and / or B 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 previous and next associated objects are an "or" relationship between a wound cell structure, battery, and electrical equipment.

[0028] 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).

[0029] 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.

[0030] 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.

[0031] The following is combined with Figure 1 to Figure 4 The utility model is further described in detail, but it is not intended to limit the utility model.

[0032] like Figure 1 and 2 As shown, in one embodiment of the utility model, the wound battery cell structure comprises a core body 1 and an anode ear 4 and a cathode ear 5 respectively connected to the core body 1; the anode ear 4 and / or the cathode ear 5 comprise at least one first pole ear 2 and at least one second pole ear 3; one end of the first pole ear 2 is connected to the core body 1; one end of the second pole ear 3 is connected to the core body 1; and the other end of the first pole ear 2 is wrapped and connected to the other end of at least one of the second pole ears 3.

[0033] The technical solution of the utility model adopts the arrangement that the first pole ear in the anode ear and / or the cathode ear is covered with the second pole ear during use, thereby preventing the second pole ear from being folded due to impact or other factors during use, thereby reducing the operation process of manually correcting the second pole ear during CCD and other detection processes, and can improve the stability of the structure and the operational efficiency of detecting battery performance, thereby improving product safety and production efficiency.

[0034] Among them, the winding core body 1 includes an anode sheet and a cathode sheet and an isolation film arranged between the anode sheet and the cathode sheet; the anode sheet, the isolation film and the cathode sheet are wound in sequence to form a winding core structure; and the anode ear 4 is connected to one side end of the anode sheet; the cathode ear 5 is connected to one side end of the cathode sheet; that is, the first pole ear 2 and the second pole ear 3 are arranged in sequence on one side end of the anode sheet; or the first pole ear 2 and the second pole ear 3 are arranged in sequence on one side end of the cathode sheet; or the first pole ear 2 and the second pole ear 3 are simultaneously and respectively arranged in sequence on one side end of the cathode sheet and the anode sheet.

[0035] In some embodiments, the first pole tab 2 is disposed on the outermost layer of the core body 1. Further, the first pole tab 2 is disposed at the upper end of the outermost layer of the core body 1 and is located above all the second pole tabs 3; or, the first pole tab 2 is disposed at the lower end of the outermost layer of the core body 1 and is located below all the second pole tabs 3. In other words, the second pole tab 3 is covered and connected from above or below by the first pole tab 2, thereby improving the convenience of processing, and also preventing the second pole tab from being folded due to impact or other factors during use, reducing the risk of increased foreign matter, thereby improving product safety and production efficiency.

[0036] Specifically, in some embodiments, Figure 1 and 2 As shown, the first pole lug 2 includes a straight portion 21 and a bent portion 22 connected to one end of the straight portion 21; the other end of the straight portion 21 is connected to the winding core body 1; the other end of the bent portion 22 is bent toward the second pole lug 3; and the bent portion 22 is covered and connected to the second pole lug 3. Further, the second pole lug 3 close to the straight portion 21 abuts against the straight portion 21, and the other second pole lugs 3 abut against the side of the adjacent second pole lug 3; and the bent portion 22 is covered and connected to all the second pole lugs 3, and the inner side of the bent portion 22 abuts against the top of all the second pole lugs 3. In other words, by bending the bent portion 22 with a relatively large height to cover and connect the second pole lug 3, the convenience of processing can be improved, and the second pole lug can be prevented from being folded due to impact or other factors during use, thereby improving product safety and production efficiency.

[0037] Specifically, in some embodiments, Figure 1As shown, the anode tab 4 and / or the cathode tab 5 further include a plurality of tab units 6, the second tab 3 abuts against the straight portion 21; the plurality of tab units 6 are stacked on the second tab 3 and away from the straight portion 21; the bent portion 22 covers the second tab 3 and the plurality of tab units 6, and the inner side surface of the bent portion 22 abuts against the top of the second tab 3 and the plurality of tab units 6. This structure can improve the protection of the second tab 2 and the plurality of tab units 6 through the covering effect of the bent portion 22 from the top, thereby improving the stability of use.

[0038] Specifically, in some embodiments, Figure 1 As shown, the first pole tab 2 further includes a covering extension portion 23; the covering extension portion 23 is connected to one end of the bent portion 22 away from the straight portion 21; and the covering extension portion 23 covers the second pole tab 2 and the plurality of pole tab units 6. This structure can further improve the protection of the second pole tab 2 and the plurality of pole tab units 6 through the double covering effect of the covering extension portion 23 and the bent portion 22 from the top and the side end, thereby improving the stability of use.

[0039] Specifically, in some embodiments, Figure 1 As shown, an inclination angle α is set between the covering extension portion 23 and the bending portion 22; and one end of the covering extension portion 23 abuts against the tab unit 6; wherein the value range of α is: 60 degrees ≤ α ≤ 90 degrees. This structure can prevent the tab unit 6 from shaking by abutting against the tab unit 6 with the covering extension portion 23 set appropriately inclined, thereby improving the stability of the structure.

[0040] Specifically, in some embodiments, Figure 2 As shown, the relationship between the height H3 of the straight portion 21 and the height H2 of the bent portion 22 satisfies: 1 / 3*H3≤H2≤H3. In some embodiments, the relationship between the height H3 of the straight portion 21 and the height H1 of the first pole lug 2 satisfies: H1=H3. This structure is achieved by lengthening the first pole lug 2 by an amount greater than or equal to one third of the straight portion 21, and the bent portion 22 is the outer ring pole lug of the winding core body 1. After winding, the extended portion is folded and wrapped around the second pole lug 3 (a pole lug of normal specifications), and pre-welded at the same time to ensure that the wrapping does not fall off completely.

[0041] Specifically, in some embodiments, Figure 3 As shown, the relationship between the height H1 of the first pole tab 2 and the height H2 of the second pole tab 3 satisfies: H1>H2. The heightened first pole tab 2 can be folded and wrapped around the second pole tab 3 (a pole tab of normal specifications), and pre-welded at the same time to ensure that the wrapping does not fall off at all.

[0042] Specifically, in some embodiments, Figure 4 As shown, the relationship between the length L2 of the straight portion 21 and the length L1 of the second pole lug 3 satisfies: L2>L1; the relationship between the length L3 of the bent portion 22 and the length L1 of the second pole lug 3 satisfies: L3>L1. In other words, the straight portion 21 and the bent portion 22 of the outer ring completely wrap the second pole lug 3 (a pole lug of normal specifications) after being folded, thereby protecting the four folding points of the upper, lower, left and right sides of the second pole lug 3 (a pole lug of normal specifications), thereby preventing the second pole lug from being folded due to impact or other factors during use, thereby improving product safety and production efficiency.

[0043] The utility model also proposes a battery, which includes a wound cell structure and an outer shell, an anode column and a cathode column; the anode column and the cathode column are respectively connected to the inner top of the outer shell; and the anode column is connected to the anode ear; the cathode column is connected to the cathode ear. The specific structure of the wound cell structure 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 repeated here one by one.

[0044] 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.

[0045] 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.

[0046] 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 wound battery cell structure, characterized in that: It includes a winding core body and an anode ear and a cathode ear respectively connected to the winding core body; the anode ear and / or the cathode ear include at least one first pole ear and at least one second pole ear; one end of the first pole ear is connected to the winding core body; one end of the second pole ear is connected to the winding core body; and the other end of the first pole ear is covered and connected to the other end of at least one second pole ear.

2. The wound battery core structure according to claim 1, characterized in that: The first pole tab includes a straight portion and a bent portion connected to one end of the straight portion; the other end of the straight portion is connected to the winding core body; the other end of the bent portion is bent toward the second pole tab; and the bent portion is covered and connected to the second pole tab.

3. The wound battery core structure according to claim 2, characterized in that: The anode ear and / or the cathode ear also includes a plurality of ear units, the second ear abuts against the straight portion; the plurality of ear units are stacked on the second ear and away from the straight portion; the bent portion covers the second ear and the plurality of ear units, and the inner side surface of the bent portion abuts against the top of the second ear and the plurality of ear units.

4. The wound battery core structure according to claim 3, characterized in that: The first pole tab further includes a covering extension portion; the covering extension portion is connected to one end of the bending portion away from the straight portion; and the covering extension portion covers the second pole tab and the plurality of pole tab units.

5. The wound battery core structure according to claim 4, characterized in that: An inclination angle α is arranged between the covering extension portion and the bending portion; wherein the value range of α is: 60 degrees ≤ α ≤ 90 degrees.

6. The wound battery core structure according to claim 2 or 5, characterized in that: The relationship between the height H3 of the straight portion and the height H2 of the bent portion satisfies: 1 / 3*H3≤H2≤H3.

7. The wound battery core structure according to claim 2, characterized in that: The relationship between the length L3 of the bent portion and the length L1 of the second electrode tab satisfies: L3>L1.

8. The wound battery core structure according to claim 7, characterized in that: The relationship between the length L2 of the straight portion and the length L1 of the second electrode tab satisfies: L2>L1.

9. The wound battery core structure according to claim 1 or 2, characterized in that: The relationship between the height H1 of the first electrode tab and the height H2 of the second electrode tab satisfies: H1>H2.

10. A battery, characterized in that: It comprises the wound battery cell structure as described in any one of claims 1 to 9 above, and an outer shell, an anode column and a cathode column; the anode column and the cathode column are respectively connected to the inner top of the outer shell; and the anode column is connected to the anode ear; the cathode column is connected to the cathode ear.

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