Battery structure

Abstract

The utility model provides a kind of battery structure. Battery structure includes at least one electrode assembly arranged along second direction, electrode assembly includes electrode assembly body and connecting piece assembly, electrode assembly body has tab group, tab group at least includes sequentially connected tab root area and pre-welding mark area;Tab group is bent along the junction of tab root area and pre-welding mark area and makes the end of tab group away from tab root area and pre-welding mark area and connecting piece assembly welding, and the junction between pre-welding mark area and tab root area and connecting piece assembly has avoiding gap;Wherein: the upper surface of connecting piece assembly is the surface of the side of connecting piece assembly away from electrode assembly body;Second direction is the thickness direction of electrode assembly body. The utility model solves the problem that tab is easily torn in the production process of battery in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery structure. Background Technology

[0002] A secondary battery includes a casing and an electrode assembly located within the casing. The electrode assembly has tabs, and the casing includes an outer shell and a cover plate, with terminals on the cover plate. Typically, the tabs in a battery structure are electrically connected to the terminals on the cover plate via connectors. However, the tabs usually consist of multiple layers of tab units, and these layers are positioned differently along the thickness of the electrode assembly. Therefore, after the multiple layers of tab units are connected to the connectors, it is difficult to maintain a consistent state for the unconnected portions (root tabs). Furthermore, the shape of the root tabs can change during subsequent battery assembly and transportation, potentially causing the root tabs to insert into the electrode plates, leading to short circuits or tab tearing. Therefore, ensuring the stability of the tabs is crucial. Utility Model Content

[0003] The main objective of this invention is to provide a battery structure that solves the problem of electrode stability during battery production in the prior art.

[0004] To achieve the above objectives, this utility model provides a battery structure, including at least one electrode assembly arranged along a second direction, the electrode assembly comprising:

[0005] The electrode assembly body has a tab group; the tab group includes at least a tab root region and a pre-soldering area connected in sequence, wherein the tab root region is connected to the electrode assembly body.

[0006] The connector assembly has a tab group bent at the connection between the tab root area and the pre-welded area, and the end of the tab group away from the tab root area is welded to the upper surface of the connector assembly; and in the second direction, there is a clearance gap between the connection between the pre-welded area and the tab root area and the connector assembly.

[0007] Wherein: the upper surface of the connector assembly is the surface of the connector assembly away from the electrode assembly body; the second direction is the thickness direction of the electrode assembly body.

[0008] Furthermore, the pre-welded area is formed by ultrasonic pre-welding.

[0009] Furthermore, the end face of the tab assembly away from the tab root region is a plane.

[0010] Furthermore, the pre-welded solder area is parallel to the upper surface of the connector assembly.

[0011] Furthermore, the shape of the projection of the electrode root region along the third direction is an isosceles triangle, where the third direction is the length direction of the electrode assembly body.

[0012] Furthermore, the root region of the auricle has a height H1 in the first direction, where H1 = H C +T Z +H0,H C T represents the height of the pre-soldered solder area in the first direction. Z H0 represents the height of the connector assembly in the first direction, and H0 is the height compensation value, where 1mm≤H0≤3mm. The first direction refers to the height direction of the electrode assembly body.

[0013] Furthermore, the connector assembly includes:

[0014] The connector and the electrode assembly are welded together.

[0015] Plastic parts are located on the side of the connector close to the electrode assembly body.

[0016] Furthermore, the plastic part also includes a clearance notch for the base area of ​​the tab.

[0017] Furthermore, an insulating film is provided on the outer surface of the electrode assembly.

[0018] Furthermore, the battery structure also includes a casing and a cover plate; the casing and cover plate enclose a receiving space; the electrode assembly is located within the receiving space, and the connector assembly is also electrically connected to the cover plate.

[0019] Applying the technical solution of this utility model, the battery structure in this application includes at least one electrode assembly arranged along a second direction. The electrode assembly includes an electrode assembly body and a connector assembly. The electrode assembly body has a tab group, which includes at least a tab root region and a pre-welded solder area connected in sequence. The tab group is bent along the connection between the tab root region and the pre-welded solder area, and one end of the tab group away from the tab root region is welded to the upper surface of the connector assembly. In the second direction, there is a clearance gap between the connection between the pre-welded solder area and the tab root region and the connector assembly.

[0020] When using the battery structure of this application, because there is a clearance between the connection between the pre-welded area and the root area of ​​the tab and the connector assembly, bending the tab assembly along the connection between the pre-welded area and the root area of ​​the tab and welding the tab assembly to the connector assembly can effectively reduce the pulling force on the root area of ​​the tab assembly caused by the bent portion, thereby effectively preventing tearing of the tab assembly. Therefore, the battery structure of this application effectively solves the problem of easy tearing of tabs during battery production in the prior art. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of the electrode assembly of a battery structure according to a specific embodiment of the present invention is shown.

[0023] Figure 2 A schematic diagram showing the arrangement of the electrode assembly bodies of two different electrode assemblies in the battery structure of this application is shown;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the structure of the electrode assembly when the tabs are not welded to the connector assembly;

[0025] Figure 4 It shows Figure 1 A schematic diagram of the electrode assembly body before the tabs are retracted.

[0026] The above figures include the following reference numerals:

[0027] 10. Electrode assembly; 11. Electrode assembly body; 111. Tab assembly; 112. Tab root area; 113. Pre-welded area; 12. Connector assembly; 121. Connector; 122. Plastic part; 123. Clearance notch. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] To address the issue of electrode stability problems, such as the easy tearing of electrodes during battery production in existing technologies, this application provides a battery structure.

[0032] Furthermore, the battery structure in this application is as follows.

[0033] like Figures 1 to 4 As shown, the battery structure in this application includes at least one electrode assembly 10 arranged along a second direction Y. The electrode assembly 10 includes an electrode assembly body 11 and a connector assembly 12. The electrode assembly body 11 has a tab group 111. The tab group 111 includes at least a tab root region 112 and a pre-soldering area 113 connected in sequence, wherein the tab root region 112 and the electrode assembly body 11 are connected. The tab group 111 is bent along the connection between the tab root region 112 and the pre-soldering area 113 and the end of the tab group 111 away from the tab root region 112 is welded to the upper surface of the connector assembly 12. In the second direction Y, there is a clearance gap between the connection between the pre-soldering area 113 and the tab root region 112 and the connector assembly 12. The upper surface of the connector assembly 12 is the surface of the connector assembly 12 away from the electrode assembly body 11. The second direction Y is the thickness direction of the electrode assembly body 11.

[0034] It is understandable that the connection between the pre-soldering area 113 and the tab root area 112 is referred to as the first connection, that is, "in the second direction Y, there is a clearance between the connection between the pre-soldering area 113 and the tab root area 112 and the connector assembly 12" means that in the second direction Y, there is a clearance between the first connection and the connector assembly 12.

[0035] When using the battery structure of this application, since there is a clearance between the connection between the pre-welded solder area 113 and the tab root area 112 and the connector assembly 12, when the tab assembly 111 is bent along the connection between the pre-welded solder area 113 and the tab root area 112 and then welded to the connector assembly 12, the pulling force of the bent portion of the tab assembly 111 on the tab root area 112 of the tab assembly 111 can be effectively reduced, thereby effectively preventing the tab assembly 111 from tearing. Therefore, the battery structure of this application effectively solves the problem of easy tearing of tabs during battery production in the prior art. The principle of this design is to ensure the stability of the tab assembly 111 during welding and reduce the stress caused by welding by adjusting the length of the bent portion of the tab assembly 111, thereby effectively preventing the tab from tearing during welding and subsequent use, and improving the reliability and consistency of the battery cell.

[0036] In the following embodiments of this application, such as Figure 1For clarity and ease of description, a first direction, a second direction, and a third direction are introduced. Furthermore, the first direction, the second direction, and the third direction are mutually perpendicular. The first direction can be the Z-axis, the second direction can be the Y-axis, and the third direction can be the X-axis. The height direction of the electrode assembly body 11 is the Z-axis, the thickness direction is the Y-axis, and the length direction is the X-axis.

[0037] Optionally, the same electrode assembly body 11 has two tab groups 111, and the two tab groups 111 are spaced apart along a third direction.

[0038] In one specific embodiment of this application, the end of the tab root region 112 away from the pre-soldering area 113 is connected to the top of the electrode assembly body 11, and two tab groups 111 are spaced apart along the length direction of the electrode assembly body 11, one tab group 111 is a positive tab group, and the other tab group 111 is a negative tab group.

[0039] Optionally, the number of electrode assemblies 10 is even, the electrode assemblies 10 are arranged in pairs along the second direction, the thickness direction of the electrode assembly body 11 is parallel to the second direction, and there are two connecting assemblies 12 between the two electrode assemblies 10 in the same group. The same connecting assemblies 12 are welded to the same polarity tab groups 111 of two different electrode assembly bodies 11.

[0040] Optionally, the pre-welded area 113 is formed by ultrasonic pre-welding. In this application, the pre-welded area 113 is formed by ultrasonic welding, and regarding the shape of the pre-welded area 113, after ultrasonic welding, the position of the tab assembly 111 corresponding to the pre-welded area 113 is constricted to form a plate or sheet shape. Simultaneously, the end of the tab assembly 111 corresponding to the pre-welded area 113 away from the tab root region 112 may also have an unwelded portion. Of course, the presence or absence of an unwelded portion can be adaptively adjusted according to actual usage requirements.

[0041] Specifically, the tab assembly 111 consists of a tab root region 112 and a pre-soldering area 113. That is, in this embodiment, the tab assembly 111 includes a tab root region 112 and a pre-soldering area 113 connected sequentially. In the direction towards the pre-soldering area 113, the cross-sectional area of ​​the tab root region 112 gradually decreases until it is the same as the cross-sectional area of ​​the pre-soldering area 113. At least a portion of the pre-soldering area 113 is bent and welded to the connector assembly 12. The principle of this design is that, through the structural design of the tab root region 112 and the pre-soldering area 113, deformation of the tab assembly 111 can be reduced during welding, while ensuring the strength of the weld. The implementation effect is that the tab assembly 111 forms a pre-welded area 113 after ultrasonic pre-welding, and the pre-welded area 113 is bent at the connection between the tab root area 112 and the tab root area 112. This allows the entire tab assembly 111 to maintain a good shape during bending and subsequent laser welding, improving the subsequent welding quality and battery performance stability.

[0042] Specifically, during implementation, each electrode group 111 is formed by multiple electrodes being gathered together through ultrasonic welding.

[0043] Optionally, the end face of the tab assembly 111 away from the tab root region 112 is a plane; that is, the end face of the pre-soldering area 113 away from the tab root region 112 is a plane.

[0044] Specifically, during implementation, such as Figure 4 As can be understood, each tab group 111 includes multiple tabs stacked along the thickness direction. Before forming the pre-soldering area 113, the multiple tabs are stacked along the thickness direction of the electrode assembly body 11. The heights of the multiple tabs are not identical; the two tabs at both ends are the highest in the thickness direction of the electrode assembly body 11, and the height of the tabs gradually decreases towards the middle tab, thus forming a U-shape or arc shape. Therefore, in this application, the end face of the tab group 111 away from the tab root region 112 is a U-shaped surface before the convergence welding. That is, the middle tab has the lowest height, ensuring that after the ultrasonic welding converges towards the center, the top of the pre-soldering area 113, i.e., the end of the pre-soldering area 113 away from the tab root region 112, is flush.

[0045] Optionally, the pre-welded area 113 and the upper surface of the connector assembly 12 are parallel; that is, when welding the tab assembly 111 and the upper surface of the connector assembly 12, the bending angle of the tab assembly 111 is 90°. This setting is more conducive to controlling the shape of the tab assembly 111, preventing tab redundancy and instability within the tab assembly 111, and by ensuring the parallelism between the pre-welded area 113 and the connector assembly 12, deformation of the tab assembly 111 can be reduced during welding, while ensuring the strength and consistency of the weld.

[0046] Optionally, the shape of the projection of the root region 112 of the pole ear along the third direction is an isosceles triangle.

[0047] Specifically, the projection of the tab root region 112 is an isosceles triangle. Of course, since the pre-soldering area 113 is very thin, the connection between the pre-soldering area 113 and the tab root region 112 can be considered as a line, forming the vertex of the isosceles triangle. However, in reality, because the pre-soldering area 113 still has a certain thickness, the top surface of the tab root region 112 is not actually flat, but more like an isosceles trapezoid.

[0048] Therefore, as shown in the figure, the electrode root region 112 in this application can also be regarded as a triangular part. Specifically, the electrode root region 112 is designed as an isosceles triangle. Since a triangle is a relatively stable state, the stability of the electrode root region 112 is improved.

[0049] Optionally, the root region 112 of the electrode ear has a height H1 in the first direction, where H1 = H C +T Z +H0,H C T represents the height of the pre-soldering area 113 in the first direction. Z H0 is the height of the connector assembly 12 in the first direction, where H0 is the height compensation value, and 1mm≤H0≤3mm.

[0050] Understandably, H C for Figure 2 The schematic diagram shows the pre-soldering area 113 after being horizontally folded 90 degrees, as shown in the image. Figure 1 The height of the pre-soldering area 113 in the first direction is shown in the diagram.

[0051] Understandably, this application limits the height of the electrode root region 112 in the first direction, which provides a greater reason to ensure the stability of the electrode root region 112. Specifically, when designing the height of the electrode root region 112, a height compensation value is also considered. This is mainly because there are dimensional tolerances in the electrode assembly. A certain height compensation value is set for this purpose to ensure that the electrode root region 112 is more stable.

[0052] In one specific embodiment of this application, the connector assembly 12 includes a connector 121 and a plastic part 122, and the electrode assembly 111 is welded to the connector 121; the plastic part 122 is disposed on the side of the connector 121 close to the electrode assembly body 11.

[0053] Optionally, the plastic part 122 is provided with a clearance notch 123 corresponding to the root area 112 of the electrode tab. By providing the plastic part, contact between the connector 121 and other parts of the electrode assembly body 11 other than the electrode tab assembly 111 can be prevented, thereby avoiding short circuits. The clearance notch 123 on the plastic part 122 can effectively ensure the compactness of the connector assembly 12 and the electrode assembly body 11 after assembly, which is beneficial to the miniaturization design of the battery.

[0054] Optionally, T Z It is equal to the sum of the thickness of the connector 121 and the thickness of the plastic part 122.

[0055] Optionally, an insulating film is provided on the outer surface of the electrode assembly 10 to ensure the insulation performance between the electrode assembly and the housing.

[0056] Optionally, the battery structure also includes a housing and a cover plate; the housing and the cover plate enclose a receiving space; the electrode assembly 10 is located within the receiving space, and the connector assembly 12 is also electrically connected to the cover plate.

[0057] The battery structure of this application optimizes the design of the tab assembly 111, ensuring the stability of the tabs during the welding process, effectively avoiding problems such as tab tearing and sinking, and significantly improving the battery yield and consistency. Through the ingenious design of the tab root region 112 and the pre-welded area 113, not only is the structural strength of the tabs enhanced, but the redundancy of the tabs is also controlled, thereby improving the overall performance of the battery. Furthermore, the cooperative use of the connector 121 and the plastic part 122 further improves the assembly efficiency and reliability of the electrode assembly 10, bringing significant benefits to the production and manufacturing of secondary batteries. In practical applications, this solution can effectively improve the production quality and efficiency of batteries and reduce the defect rate during the production process.

[0058] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0059] 1. Effectively solves the problem of easily torn tabs during battery production in existing technologies;

[0060] 2. Simple structure and stable performance.

[0061] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0062] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery structure, characterized in that, Includes at least one electrode assembly (10) arranged along a second direction, the electrode assembly (10) comprising: The electrode assembly body (11) has a tab group (111); the tab group (111) includes at least a tab root region (112) and a pre-soldering area (113) connected in sequence, wherein the tab root region (112) is connected to the electrode assembly body (11). The connector assembly (12) has a tab group (111) that is bent at the junction of the tab root region (112) and the pre-welded solder area (113) and the end of the tab group (111) away from the tab root region (112) is welded to the upper surface of the connector assembly (12); and in a second direction, there is a clearance gap between the junction of the pre-welded solder area (113) and the tab root region (112) and the connector assembly (12); Wherein: the upper surface of the connector assembly (12) is the surface of the connector assembly (12) away from the electrode assembly body (11); the second direction is the thickness direction of the electrode assembly body (11).

2. The battery structure according to claim 1, characterized in that, The pre-welded area (113) is formed by ultrasonic pre-welding.

3. The battery structure according to claim 1, characterized in that, The end face of the electrode assembly (111) away from the root region (112) of the electrode is a plane.

4. The battery structure according to claim 1, characterized in that, The pre-welded solder area (113) and the upper surface of the connector assembly (12) are parallel.

5. The battery structure according to claim 4, characterized in that, The shape of the projection of the electrode root region (112) along the third direction is an isosceles triangle, wherein the third direction is the length direction of the electrode assembly body (11).

6. The battery structure according to claim 5, characterized in that, The pole ear root region (112) has a height H1 in the first direction, H1 = H C +T Z +H0,H C T is the height of the pre-soldering area (113) in the first direction. Z H0 is the height of the connector assembly (12) in the first direction, and H0 is the height compensation value, 1mm≤H0≤3mm, where the first direction is the height direction of the electrode assembly body (11).

7. The battery structure according to any one of claims 1 to 6, characterized in that, The connector assembly (12) includes: Connector (121), wherein the electrode assembly (111) is welded to the connector (121); A plastic part (122) is disposed on the side of the connector (121) near the electrode assembly body (11).

8. The battery structure according to claim 7, characterized in that, The plastic part (122) also includes a clearance notch (123) provided for the root region (112) of the tab.

9. The battery structure according to claim 8, characterized in that, An insulating film is provided on the outer surface of the electrode assembly (10).

10. The battery structure according to claim 9, characterized in that, It also includes a housing and a cover plate; the housing and the cover plate enclose a receiving space; the electrode assembly (10) is located in the receiving space, and the connector assembly (12) is also electrically connected to the cover plate.

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