Tab structure and battery

Abstract

The utility model relates to the technical field of pin type valve terminals, and discloses a tab structure and a battery. The tab structure comprises a welding section welded on a current collector of a pole piece and an exposed section exposed out of the current collector, the exposed section comprises a wrinkle-shaped adjusting part, and a first end of the adjusting part is fixedly connected with a bonding pad connecting part; and the adjusting part can be driven to extend / contract in the width direction of the pole piece so as to adjust the position of the first end of the bonding pad connecting part. According to the utility model, the position of the first end of the bonding pad connecting part can be adjusted by driving the adjusting part to extend / contract in the width direction of the pole piece, so as to align to the welding position on the protective plate bonding pad, ensure that the first end and the bonding pad connecting part can be accurately aligned and firmly welded, and improve the production yield of batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, in particular to a tab structure and a battery. Background Art

[0002] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, and energy storage systems. Tabs are a crucial component of lithium-ion batteries, connecting the battery cell to the external circuitry. However, during the welding process between the tabs and the pads on the protective plate, deviations in the center-to-center distance between the tabs often lead to poor welding, impacting lithium-ion battery production efficiency and product performance.

[0003] Currently, the industry has yet to fully address the impact of tab center distance deviation on welding yield. Therefore, there is an urgent need for a tab structure design that can control the variation in tab center distance to improve welding yield.

[0004] The above information is presented as background information only to assist with an understanding of the present disclosure and is not a determination or admission that any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0005] The purpose of the present invention is to provide a tab structure and a battery to solve or at least partially solve the technical problems existing in the prior art.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a tab structure, comprising a welding section for welding to a current collector of a pole piece and an exposed section for being exposed outside the current collector; the exposed section comprises a wrinkled adjustment portion, a first end of the adjustment portion being fixedly connected to a pad connection portion;

[0008] The adjusting portion can be driven to expand / contract in the width direction of the pole piece to adjust the position of the first end of the pad connecting portion.

[0009] Optionally, the adjustment portion includes a plurality of connecting ribs spaced apart along the length direction of the pole piece, the two ends of the connecting ribs being fixedly connected to the pad connecting portion and the welding section, and a pleated sheet that can be driven to stretch / contract in the width direction of the pole piece being fixedly connected between each two adjacent connecting ribs.

[0010] Optionally, the pleated sheet is composed of two strip sheets with their long sides butted together, and the two strip sheets form a pleated angle at the butt joint;

[0011] Wherein, the long side of the corrugated sheet is a side portion of the strip sheet extending along the length direction of the pole piece.

[0012] Optionally, the pleat depth of the pleated sheet and the spacing between two adjacent connecting ribs match the flexibility of the pole piece;

[0013] The fold depth of the fold sheet is the initial size of the fold sheet in the thickness direction of the pole piece.

[0014] Optionally, the plurality of connecting ribs are arranged at equal intervals along the length direction of the pole piece at a preset interval.

[0015] Optionally, the tab structure further includes tab glue connected to the first end of the welding section.

[0016] Optionally, the exposed section and the welding section are welded or integrally formed to form a metal belt.

[0017] Optionally, the metal strip is an aluminum strip or a copper strip.

[0018] In a second aspect, the present invention further provides a battery, comprising a pole core and a pole tab electrically connected to the pole core, wherein the pole tab adopts the pole tab structure as described above.

[0019] Optionally, the battery is a lithium-ion battery.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The pole ear structure provided by the present invention can adjust the position of the first end of the pad connecting portion by driving the adjustment portion to expand / contract in the width direction of the pole piece to align with the welding position on the protection plate pad, ensuring that the two can be accurately positioned and firmly welded, thereby improving the production yield of the battery.

[0022] The present invention has other features and advantages, which will be apparent from the accompanying drawings and subsequent detailed descriptions incorporated herein, or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural principle diagram of a tab structure provided by an embodiment of the present utility model.

[0025] Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle.

[0026] Figure 3 This is an application case of a battery assembly provided by an embodiment of the present utility model.

[0027] In the figure: 10, welding section; 20, pad connection part; 30, adjustment part; 31, pleated sheet; 32, connecting rib; 40, ear glue. DETAILED DESCRIPTION

[0028] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0029] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0030] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0031] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0032] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0033] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0034] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0035] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0036] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] Example 1:

[0038] See also Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a tab structure provided by an embodiment of the present utility model. Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle.

[0039] The present embodiment provides a tab structure comprising a welding section 10 for welding to a current collector of a pole piece and an exposed section for being exposed outside the current collector;

[0040] The exposed section includes a wrinkled adjustment portion 30 , and a first end of the adjustment portion 30 (the upper end of the adjustment portion 30 ) is fixedly connected to the pad connection portion 20 ;

[0041] The adjustment portion 30 can be driven in the width direction of the pole piece ( Figure 1 The pad connector 20 can be expanded / contracted in the transverse direction of the middle electrode piece to adjust the position of the first end of the pad connector 20 (the upper end of the pad connector 20).

[0042] Because the pad connection part 20 is used to be welded and fixed to the protection plate pad during battery assembly, if the pad connection part 20 and the protection plate pad produce position deviation during assembly, for example, there is a deviation between the center distance between the pole ear and the center distance between the protection plate pad, resulting in the welding positions of the two cannot be accurately matched. At this time, by driving the adjustment part 30 to stretch / contract in the width direction of the pole piece, the position of the first end of the pad connection part can be adjusted to align with the welding position on the protection plate pad, ensuring that the two can be accurately aligned and firmly welded, thereby ensuring the welding quality and improving the production yield of the battery.

[0043] It is understood that the adjustment unit 30 is configured as follows Figure 1 The vertical fold structure shown makes the tab Figure 1 It has a certain elasticity or ductility in the transverse direction, for example Figure 1 As shown in FIG. 1 , when the left fold of the upper half of the adjustment portion 30 is driven to contract, the first end of the adjustment portion 30 can move along Figure 1 therefore, according to different application scenarios, the corresponding adjustment of the pleats of the stretch / contraction can change the position of the first end of the adjustment portion 30, which is very convenient.

[0044] Specifically, such as Figure 2 As shown, the adjustment portion 30 includes a plurality of connecting ribs 32 spaced apart along the length direction of the pole piece, the two ends of the connecting ribs 32 are fixedly connected to the pad connecting portion 20 and the welding section 10, and a pleated sheet 31 that can be driven to stretch / contract in the width direction of the pole piece is fixedly connected between each adjacent two connecting ribs 32.

[0045] Furthermore, the flexibility of the tab can be adjusted accordingly by controlling the depth and spacing of the folds of the fold sheet 31, thereby adapting to the requirements of different welding processes and battery specifications.

[0046] More specifically, the pleated sheet 31 is composed of two strip sheets with their long sides butted together, and the two strip sheets form a pleated angle B at the butt joint;

[0047] Among them, the long side of the pleated sheet 31 is the strip sheet along the length direction of the pole piece ( Figure 2 A side extending in the longitudinal direction of the .

[0048] Specifically, the depth of the folds of the fold sheet 31 and the distance between two adjacent connecting ribs 32 match the flexibility of the pole piece;

[0049] The fold depth of the fold sheet 31 is the thickness of the fold sheet 31 in the direction of the electrode (perpendicular to the Figure 2 The initial size in the direction of the paper.

[0050] By designing a vertical pleated structure, the tab can be flexibly bent in the width direction of the pole piece, thereby adaptively adjusting the corresponding center distance to ensure accurate contact between the tab and the protection plate pad during welding, thereby significantly improving the welding yield between the tab and the protection plate pad; moreover, the vertical pleated structure not only maintains the good conductivity and mechanical strength of the battery cell, but also does not have a negative impact on the overall performance of the battery; at the same time, the design of this structure does not require complex manufacturing process improvements and is easy to implement on the existing battery cell tab production line, with high economic benefits.

[0051] As an optional implementation of this embodiment, the aforementioned plurality of connecting ribs 32 are arranged at equal intervals along the length direction of the pole piece at a preset interval.

[0052] Specifically, it also includes an ear glue 40 connected to the first end of the welding section 10 .

[0053] Specifically, the exposed section and the welding section 10 are welded or integrally formed to form a metal strip; the first end of the welding section 10 is connected to the tab glue 40 .

[0054] In summary, the tab structure of this embodiment can automatically adjust its position during welding to adapt to the change in the center distance between the battery cell and the protection plate pad, ensuring good welding quality; and the tab structure is suitable for lithium-ion batteries of various specifications, especially battery assembly processes with high welding yield requirements.

[0055] Example 2:

[0056] This embodiment provides a battery comprising a core 100 and a tab for electrically connecting to the core 100, wherein the tab adopts the tab structure as described in Example 1. Since the tab structure has been described in detail in Example 1, it will not be repeated in this embodiment.

[0057] In this embodiment, the battery is a lithium-ion battery; specifically, the metal strip of the positive electrode tab is an aluminum strip, and the metal strip of the negative electrode tab is a copper strip or a copper-nickel-plated strip.

[0058] Please refer to Figure 3 , Figure 3 This is an application case of a battery assembly provided by an embodiment of the present utility model.

[0059] like Figure 3 As shown on the left, during battery assembly, the welding parts between the tabs and the protection plate pads were not well connected, especially the negative tab on the right;

[0060] Therefore, at this time, the first end of the pad connecting portion 20 needs to be bent toward the right side so as to align it with the welding portion of the protection plate pad. The principle of bending the tab has been explained in the first embodiment and will not be repeated here.

[0061] like Figure 3 As shown on the right side, the first end of the bent pad connecting portion 20 can be better aligned with the welding position of the protection plate pad, and welding can be performed at this time to ensure good welding quality.

[0062] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tab structure comprising a welding section (10) for welding to a current collector of a pole piece and an exposed section for exposing to the outside of the current collector; characterized in that: The exposed section comprises a wrinkled adjustment portion (30), a first end of the adjustment portion (30) being fixedly connected to a pad connection portion (20); The adjusting portion (30) can be driven to expand / contract in the width direction of the pole piece to adjust the position of the first end of the pad connecting portion (20).

2. The tab structure according to claim 1, characterized in that: The adjusting portion (30) comprises a plurality of connecting ribs (32) arranged at intervals along the length direction of the pole piece, the two ends of the connecting ribs (32) being fixedly connected to the pad connecting portion (20) and the welding section (10), and a pleated sheet (31) capable of being driven to expand / contract in the width direction of the pole piece being fixedly connected between each two adjacent connecting ribs (32).

3. The tab structure according to claim 2, characterized in that: The pleated sheet (31) is composed of two strip-shaped sheets with their long sides butted together, and the two strip-shaped sheets form a pleated angle at the butt joint; Wherein, the long side of the pleated sheet (31) is a side portion of the strip sheet extending along the length direction of the pole piece.

4. The tab structure according to claim 3, characterized in that: The pleat depth of the pleated sheet (31) and the spacing between two adjacent connecting ribs (32) match the flexibility of the pole piece; The fold depth of the fold sheet (31) is the initial dimension of the fold sheet (31) in the thickness direction of the pole piece.

5. The tab structure according to claim 2, characterized in that: The plurality of connecting ribs (32) are arranged at equal intervals along the length direction of the pole piece at a preset interval.

6. The tab structure according to claim 2, characterized in that: It also includes a tab glue (40) connected to the first end of the welding section (10).

7. The tab structure according to claim 2, characterized in that: The exposed section and the welding section (10) are welded or integrally formed to form a metal belt.

8. The tab structure according to claim 7, characterized in that: The metal strip is an aluminum strip or a copper strip.

9. A battery comprising a pole core (100) and a pole ear electrically connected to the pole core (100), characterized in that: The tab adopts the tab structure as described in any one of claims 1 to 8.

10. A battery according to claim 9, characterized in that: The battery is a lithium-ion battery.

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