Tab structure, battery cell pole piece and winding battery cell
By designing a T-shaped tab structure with a large coverage area, the problem of the tab scratching the aluminum-plastic film during the shrinking process was solved, thus improving the stability and safety of the battery cell.
Patent Information
- Application Number
- CN202422820336.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The existing battery cell tab structure is prone to squeezing and scratching the aluminum-plastic film during the shrinking process, leading to corrosion and reduced safety in use.
Design an electrode structure including an electrode body, a first connector, a second connector, and a third connector. The third connector extends toward the welding end face to form a T-shaped structure with a large coverage area, covering the metal material of the electrode body to prevent squeezing and scratching.
It improves the stability and protective performance of the tab structure, prevents metal materials from scratching the aluminum-plastic film, improves the edge voltage of the battery cell, and enhances the safety of use.
Smart Images
Figure CN223665629U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of electric core, especially relates to a tab structure, electric core pole piece and winding electric core. BACKGROUND
[0002] Lithium ion battery has been in a monopoly position in the field of mobile electronic devices such as bluetooth headset, mobile phone, notebook computer, tablet computer, video camera and portable power supply, and has been applied in batches in the field of electric motorcycle and electric vehicle. The battery is divided into positive and negative poles, and the tab is a metal conductor for leading out the positive and negative poles from the electric core. In simple terms, the ears of the positive and negative poles of the battery are the contact points during charging and discharging.
[0003] However, the tab structure of the existing part of the electric core is folded after necking, and is extruded through the processes of two-seal embossing and necking. The metal strip of the tab structure directly faces the aluminum plastic film. Under the action of extrusion force, the metal strip can scratch the aluminum plastic film and cause corrosion due to poor edge voltage, thereby reducing the safety of use. UTILITY MODEL CONTENTS
[0004] The utility model discloses a tab structure, which can solve the technical problem of poor corrosion protection performance of the prior art.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] A tab structure, comprising a tab body, a first connecting piece, a second connecting piece and a third connecting piece, the first connecting piece and the second connecting piece are connected to the two opposite side surfaces of the tab body, a welding end face is arranged on the tab body, the third connecting piece is connected with the second connecting piece, and the third connecting piece is arranged on the tab body in the direction of the welding end face, and the projection of the third connecting piece in the direction of the tab body is partially coincident with or misaligned with the first connecting piece.
[0007] Preferably, the tab body comprises a welding segment, a rubber bonding segment and a bending segment connected in sequence, the bending segment can be arranged in the direction of the welding segment, and the welding end face is arranged on one side surface of the welding segment.
[0008] When the tab body is in a bent state, one side end of the bending segment is connected to one side surface of the third connecting piece away from the tab body.
[0009] Preferably, the third connecting piece and the second connecting piece are arranged in a T-shaped structure.
[0010] Preferably, the relationship between the width d5 of the third connector, the width d3 of the tab body, and the width d4 of the second connector satisfies: d3 < d5 < d4.
[0011] Preferably, the relationship between the width d5 of the third connector, the width d3 of the tab body, and the width d4 of the second connector satisfies: d5≤d4-d3.
[0012] Preferably, the relationship between the thickness h1 of the third connector and the thickness h3 of the second connector satisfies: h1 < h3.
[0013] Preferably, in the width direction of the electrode structure, the relationship between the distance d1 between one side edge of the third connector and one side edge of the electrode body, and the distance d2 between one side edge of the second connector and one side edge of the electrode body, satisfies: d1=(1 / 6~1 / 5)*d2.
[0014] Preferably, the first connector is PP tab adhesive, PE tab adhesive, or PVC tab adhesive;
[0015] And / or, the second connector is PP tab adhesive, PE tab adhesive, or PVC tab adhesive;
[0016] And / or, the third connector is PP tab adhesive, PE tab adhesive, or PVC tab adhesive.
[0017] This utility model also discloses a battery cell electrode, an electrode body, and the aforementioned tab structure; the electrode body includes a current collector and an active material layer connected to at least one side surface of the current collector; the active material layer is provided with a tab groove; the tab groove penetrates the active material layer and extends to one side surface of the current collector; the welding end face of the tab body is disposed in the tab groove and connected to the current collector; and the third connector and the current collector are both disposed on the same side surface of the tab body.
[0018] This utility model also discloses a wound battery cell, including the aforementioned battery cell electrode sheet.
[0019] The beneficial effects of this utility model are that, by extending the third connector toward the welding end face and setting it on the electrode body, the coverage area and support area of the metal material of the electrode body can be increased, thereby effectively solving the problem of the metal material of the electrode body being squeezed and scratched by the aluminum-plastic film during the shrinking process; thus, it can improve the stability and protection performance of use, and is conducive to improving the voltage at the edge of the battery cell. Attached Figure Description
[0020] The following will refer to the appendix. Figures 1-6This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.
[0021] Figure 1 This is a front view of the tab structure according to an embodiment of the present invention;
[0022] Figure 2 This is a bottom view of the electrode structure according to an embodiment of the present invention;
[0023] Figure 3 This is a schematic diagram of the electrode structure according to an embodiment of the present invention;
[0024] Figure 4 This is a schematic diagram of the structure of a battery cell electrode sheet according to an embodiment of the present invention;
[0025] Figure 5 This is a schematic diagram of the structure of a battery cell electrode sheet according to an embodiment of the present invention;
[0026] Figure 6 This is a schematic diagram of the structure of a wound battery cell according to an embodiment of the present invention.
[0027] In the figure: 1-Electrode body; 11-Welding end face; 101-Welding section; 102-Adhesive-coated section; 103-Bending section; 2-First connector; 3-Second connector; 4-Third connector; 5-Electrode body; 51-Current collector; 52-Active material layer; 521-Electrode groove; 100-Cell body. Detailed Implementation
[0028] Unless otherwise defined, 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0031] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.
[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0033] The following is in conjunction with the appendix Figures 1-6 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.
[0034] like Figure 1 As shown, in one embodiment of this utility model, the electrode structure includes an electrode body 1, a first connector 2, a second connector 3, and a third connector 4. The first connector 2 and the second connector 3 are connected to two opposite side surfaces of the electrode body 1. The electrode body 1 is provided with a welding end face 11. The third connector 4 is connected to the second connector 3 and extends toward the welding end face 11 on the electrode body 1. The projection of the third connector 4 toward the electrode body 1 is partially overlapped with or misaligned with the first connector 2.
[0035] The technical solution of this utility model extends the third connector toward the welding end face and is disposed on the tab body 1, which can increase the coverage area and support area of the metal material of the tab body, thereby effectively solving the problem of the metal material of the tab body squeezing and scratching the aluminum-plastic film during the shrinking process; thus, it can improve the stability and protection performance of use, and is conducive to improving the voltage at the edge of the battery cell.
[0036] Specifically, in some embodiments, the first connector 2 is PP tab adhesive, PE tab adhesive, or PVC tab adhesive; and / or, the second connector 3 is PP tab adhesive, PE tab adhesive, or PVC tab adhesive; and / or, the third connector 4 is PP tab adhesive, PE tab adhesive, or PVC tab adhesive. Appropriate tab adhesive materials are selected based on actual conditions and production requirements to ensure the achievement of adhesive protection performance.
[0037] Specifically, in some implementations, such as Figure 1 and 3 As shown, the tab body 1 includes a welding section 101, an adhesive section 102, and a bending section 103 connected in sequence. The bending section 103 can be bent towards the welding section 101. The welding end face 11 is provided on one side surface of the welding section 101. When the tab body 1 is in a bent state, one side end of the bending section 103 is connected to the side surface of the third connector 4 away from the tab body 1. That is to say, when this tab structure is used for cell welding, the third connector 4 can cover the metal material of the tab body 1, and the bending section 103 can be bent onto the inner third connector 4 when bent. This effectively solves the problem of the metal material of the tab body squeezing and scratching the aluminum-plastic film during the shrinking process, thereby improving the safety and stability of use.
[0038] Specifically, in some implementations, such as Figure 1 and 2 As shown, the third connector 4 and the second connector 3 are arranged in a T-shape. That is, this structure, through the T-shaped third connector 4 added to one side of the tab body 1, allows the tab to be folded onto the adhesive of the inner T-shaped third connector 4 during cell welding and tab folding; effectively solving the problem of the metal material of the tab body squeezing and scratching the aluminum-plastic film during the folding process; thus improving the safety and stability of use. Furthermore, the second connector 3 and the third connector 4 are integrally formed. That is, the second connector 3 and the third connector 4 form a single-sided inner T-shaped adhesive structure; thereby covering the metal material of the tab body 1 over the largest possible area and effectively solving the problem of the metal material of the tab body squeezing and scratching the aluminum-plastic film during the folding process; thus improving the safety and stability of use.
[0039] Specifically, in some implementations, such as Figure 2 As shown, the relationship between the width d5 of the third connector 4, the width d3 of the tab body 1, and the width d4 of the second connector 3 satisfies: d3 < d5 < d4; and d5 ≤ d4 - d3. In other words, by appropriately minimizing the width of the extended third connector 4, the connection to the bent section 103 can be ensured, and the stress of the bent section 103 on the third connector 4 can be reduced, thereby improving the stability of use.
[0040] Specifically, in some implementations, such as Figure 2 and 3 As shown, the relationship between the thickness h1 of the third connector 4, the thickness h3 of the second connector 3, and the thickness h4 of the first connector 2 satisfies: h1 < h3 = h4. This structure, with its stepped third connector 4 and second connector 3 in the thickness direction, ensures that the bending section 103 accurately falls into the third connector 4 during bending, thus achieving the effect of bending onto the adhesive of the inner T-shaped third connector 4 when used for cell welding and when bending the tabs; effectively solving the problem of metal material extrusion and scratching of the aluminum-plastic film during the tab body shrinkage process.
[0041] Specifically, in some implementations, such as Figure 1 and 2 As shown, in the width direction of the tab structure, the relationship between the distance d1 between one side edge of the third connector 4 and one side edge of the tab body 1, and the distance d2 between one side edge of the second connector 3 and one side edge of the tab body 1, satisfies: d1 = (1 / 6 ~ 1 / 5) * d2. That is, by appropriately minimizing the width of the extended third connector 4, the connection to the bent section 103 can be ensured, and the stress of the bent section 103 on the third connector 4 can be reduced, thereby improving the stability of use.
[0042] This utility model also proposes a battery cell electrode, such as Figure 4 and 5 As shown, the battery cell electrode includes an electrode body 5 and a tab structure. The electrode body 5 includes a current collector 51 and an active material layer 52 connected to at least one side surface of the current collector 51. The active material layer 52 is provided with a tab groove 521. The tab groove 521 penetrates the thickness direction of the active material layer 52 and extends to one side surface of the current collector 51. The welding end face 11 of the tab body 1 is disposed in the tab groove 521 and connected to the current collector 51. The third connector 4 and the current collector 51 are both disposed on the same side surface of the tab body 1. The specific structure of the tab structure is as described in the above embodiments. Since this battery cell electrode 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 in detail here.
[0043] This utility model also proposes a wound battery cell, such as Figure 6 As shown, the wound battery cell includes a battery cell body 100 and a tab structure, with the tab structure connected to the upper end of the battery cell body 100; the specific structure of the tab structure is as described in the above embodiments; the specific structure of the battery cell electrode sheet is as described in the above embodiments. Since this wound battery cell adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0044] The battery cell body 100 includes a positive electrode sheet, a separator, and a negative electrode sheet. The positive electrode sheet, separator, and negative electrode sheet are sequentially stacked and wound to form a wound body. The positive electrode sheet includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area. The positive electrode coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative electrode active material layer, while the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.
[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0046] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.
Claims
1. A tab structure, characterized in that: The device includes a tab body, a first connector, a second connector, and a third connector; the first connector and the second connector are connected to two opposite side surfaces of the tab body; the tab body has a welding end face; the third connector is connected to the second connector, and the third connector extends toward the welding end face and is disposed on the tab body; and the projection of the third connector toward the tab body partially overlaps with or is misaligned with the first connector.
2. The electrode structure according to claim 1, characterized in that: The electrode body includes a welding section, an adhesive section, and a bending section connected in sequence; the bending section is configured to bend toward the welding section; the welding end face is disposed on one side surface of the welding section; Furthermore, when the electrode body is in a bent state, one end of the bent section is connected to the surface of the third connector away from the electrode body.
3. The electrode structure according to claim 1, characterized in that: The third connector and the second connector are arranged in a T-shape.
4. The electrode structure according to claim 3, characterized in that: The relationship between the width d5 of the third connector, the width d3 of the tab body, and the width d4 of the second connector satisfies: d3 < d5 < d4.
5. The electrode structure according to claim 3 or 4, characterized in that: The relationship between the width d5 of the third connector, the width d3 of the tab body, and the width d4 of the second connector satisfies: d5≤d4-d3.
6. The electrode structure according to claim 3, characterized in that: The relationship between the thickness h1 of the third connector and the thickness h3 of the second connector satisfies: h1 < h3.
7. The electrode structure according to claim 1, characterized in that: In the width direction of the electrode structure, the relationship between the distance d1 between one side edge of the third connector and one side edge of the electrode body, and the distance d2 between one side edge of the second connector and one side edge of the electrode body, satisfies: d1=(1 / 6~1 / 5)*d2.
8. The electrode structure according to claim 1, characterized in that: The first connector is PP tab adhesive, PE tab adhesive, or PVC tab adhesive; And / or, the second connector is PP tab adhesive, PE tab adhesive, or PVC tab adhesive; And / or, the third connector is PP tab adhesive, PE tab adhesive, or PVC tab adhesive.
9. A battery cell electrode, characterized in that: The device includes an electrode body and the tab structure as described in any one of claims 1 to 8; the electrode body includes a current collector and an active material layer connected to at least one side surface of the current collector; the active material layer is provided with a tab groove; the tab groove penetrates the active material layer and extends to one side surface of the current collector; the welding end face of the tab body is disposed in the tab groove and connected to the current collector; and the third connector and the current collector are both disposed on the same side surface of the tab body.
10. A wound battery cell, characterized in that: Includes the cell electrode sheet as described in claim 9.