Battery connecting piece, battery cell and battery

Abstract

The utility model belongs to the field of power batteries, and particularly relates to a battery connecting piece, a battery cell and a battery, the whole battery connecting piece is of a symmetrical structure, the U-like design is adopted, the thickness of the battery connecting piece can be effectively reduced by half, the toughness of the battery connecting piece is improved, and the battery connecting piece can be more stably connected by matching with the design of an arc-shaped bending part and a tab connecting piece and a pole connecting piece which can be connected in a bending manner. Multiple multi-angle folding can be realized, and the utilization rate of the internal space of the battery shell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery connector, a battery cell, and a battery. Background Art

[0002] Lithium-ion power batteries have been widely used in computers, mobile phones and other fields due to their high energy density, high power density, many cycles and long storage time. With the maturity of production technology, they have broad application prospects in electric vehicles such as electric bicycles and electric vehicles and energy storage facilities. The widespread application of power batteries can effectively solve global problems such as environmental pollution and energy crisis.

[0003] In the existing technology, after the tab is welded to the soft connecting piece, the soft connecting piece is then welded to the connecting piece on the cover. In order to ensure the overcurrent capacity of the battery cell, the thickness of the connecting piece is usually above 0.8mm, and the thickness of some large-capacity battery cells is above 1.2mm. As the thickness of the connecting piece increases, the toughness of the connecting piece deteriorates and it is difficult to bend, which can easily lead to a large bending gap after bending (exceeding 4mm, or even reaching more than 10mm), thereby causing problems such as abnormal battery cell shell entry. In addition, this design requires the use of two different connecting pieces at the same time, which can easily lead to misuse and scrapping of the production line. Utility Model Content

[0004] The embodiments of the present application provide a battery connecting piece, a battery cell, and a battery, which are intended to improve the toughness of the connecting piece, enable multiple folding at multiple angles, and improve the utilization rate of the internal space of the shell.

[0005] To this end, according to one aspect of the present application, a battery connecting piece is provided, comprising an arc-shaped bending portion and two L-shaped connecting pieces symmetrically connected on both sides of the arc-shaped bending portion, and the two L-shaped connecting pieces can be folded in half about the arc-shaped bending portion; the L-shaped connecting piece comprises a pole connecting piece bendably connected to the arc-shaped bending portion and a tab connecting piece bendably connected to the pole connecting piece, and when the pole connecting piece and the tab connecting piece are not bent, the pole connecting piece and the tab connecting piece are located in the same plane.

[0006] Optionally, the battery connecting piece has a thickness of 0.2 mm to 0.8 mm.

[0007] Optionally, the arc diameter of the arc-shaped bending portion is 0.5mm-4mm.

[0008] Optionally, the pole connecting piece is provided with embossing.

[0009] Optionally, the embossing is in the shape of a rectangle, a diamond or a circle, with a depth of 0.1 mm to 0.2 mm, and the film is pulled inwards by 10° to 60°.

[0010] Optionally, the arc-shaped bending portion and the two L-shaped connecting pieces are an integrated structure, and are formed by stamping a metal sheet.

[0011] Optionally, a groove is provided at a connection between the pole connecting piece and the tab connecting piece, and the pole connecting piece and the tab connecting piece can be bent at the groove.

[0012] According to another aspect of the present application, a battery cell is provided, comprising a winding core, a cover plate, and the battery connecting piece as described above, wherein the tab connecting piece is welded to the tab on the winding core, and the pole connecting piece is welded to the pole on the cover plate.

[0013] According to another aspect of the present application, a battery is provided, comprising a housing and the battery cell as described above, wherein the battery cell is placed in the housing.

[0014] The beneficial effects of the battery connector, battery cell and battery provided by the present application are: compared with the existing technology, the battery connector of the present application has an overall symmetrical structure and a U-shaped design, which can effectively reduce the thickness of the battery connector by half, improve the toughness of the battery connector, and cooperate with the design of the arc-shaped bending portion and the bendable tab connector and pole connector to achieve multiple multi-angle folding, thereby improving the utilization rate of the internal space of the battery casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] in:

[0017] Figure 1 1 is a schematic structural diagram of a battery connecting piece in an embodiment of the present application when the battery connecting piece is not bent;

[0018] Figure 2 yes Figure 1 A side view of the battery connector shown;

[0019] Figure 3 This is a schematic structural diagram of a battery connecting piece after one bending, shown in one embodiment of the present application;

[0020] Figure 4 This is a schematic structural diagram of a battery connecting piece after secondary bending shown in an embodiment of the present application;

[0021] Figure 5 This is a schematic structural diagram of a battery connecting piece after being bent three times according to an embodiment of the present application;

[0022] Figure 6 Schematic diagram showing the connection between the tab connector of a battery connector and two wound cores / stacked cores in a secondary bending state according to an embodiment of the present application;

[0023] Figure 7 yes Figure 6 Schematic diagram of the structure shown, in which two winding cores / stacked cores are combined at once;

[0024] Figure 8 This is a schematic diagram of two wound cores / stacked cores welded to a cover plate in a closed state.

[0025] Figure 9 yes Figure 8 The cell connecting piece in the cover plate welded state is bent 90 degrees again to present a secondary core-closed state.

[0026] Description of main component symbols:

[0027] 100. Battery connector;

[0028] 110, arc-shaped bending portion;

[0029] 120, L-shaped connecting piece; 1201, groove; 121, pole connecting piece; 1211, embossing; 122, tab connecting piece;

[0030] 200, core;

[0031] 300. Cover plate. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many other forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0033] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0036] It should also be noted that, in the embodiments of the present application, the same figure mark represents the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0037] As described in the background technology, in the past, connecting plates were made of copper and aluminum. In order to ensure the current carrying capacity of the battery cell, the thickness was usually above 0.8mm. It was difficult to bend and the bending accuracy was difficult to guarantee. The bending gap was large, which affected the insertion of the battery cell into the shell, resulting in poor welding quality and scrap.

[0038] In order to solve the above problems, according to one aspect of the present application, an embodiment of the present application provides a battery connecting piece, such as Figure 1-Figure 2 As shown, the battery connecting piece 100 includes an arc-shaped bending portion 110 and two L-shaped connecting pieces 120 symmetrically connected to both sides of the arc-shaped bending portion 110, and the two L-shaped connecting pieces 120 can be folded in half about the arc-shaped bending portion 110; the L-shaped connecting piece 120 includes a pole connecting piece 121 that can be bendably connected to the arc-shaped bending portion 110 and a tab connecting piece 122 that can be bendably connected to the pole connecting piece 121, the pole connecting piece 121 is used to connect to the pole of the cover plate, and the tab connecting piece 122 is used to connect to the tab of the winding core. When the pole connecting piece 121 and the tab connecting piece 122 are not bent, the pole connecting piece 121 and the tab connecting piece 122 are located in the same plane.

[0039] The arc-shaped bending portion 110 is designed to facilitate bending and offset stress.

[0040] The battery connecting piece 100 in the embodiment of the present application is specifically used as follows:

[0041] The two L-shaped connecting pieces 120 are folded in half about the arc-shaped bending portion 110, so that the battery connecting piece 100 is Figure 1 The U-shaped structure shown becomes Figure 3 In the L-shaped structure shown, the thickness of the battery connecting piece 100 is doubled to ensure the flow capacity. At this time, the battery connecting piece 100 is in a single bending state;

[0042] Figure 3 The battery connecting piece 100 after the first bending is bent again by 90 degrees along the connection between the pole connecting piece 121 and the tab connecting piece 122 to become Figure 4 The pole connecting piece 121 and the tab connecting piece 122 are in a vertical state, which can be used for ultrasonic welding of the winding core 200 / stacked core, and is a secondary bending state. Figure 6 As shown, the left and right sides of the lower surface of the tab connecting piece 122 are connected to a tab of the winding core 200 / stacked core, and the core can be closed after the ultrasonic welding is completed, showing as Figure 7 The core closing state shown is once;

[0043] like Figure 8 As described above, two wound cores 200 / stacked cores in a one-time core state are prepared and laser welded with the cover plate 300, and the pole connecting piece 121 is attached to the pole of the cover plate 300 and fixed by laser welding, presenting the cover plate 300 in a welded state;

[0044] The battery cell in the welded state of the cover plate 300 is bent again by 90 degrees to present a secondary core-closed state. The battery connecting piece 100 after the secondary core-closed state is as follows: Figure 5 In the three-bending state shown, the gap between the battery connecting pieces 100 can be less than 2 mm, which greatly improves the space utilization, facilitates the subsequent insertion of the battery cell into the shell, and improves the process efficiency.

[0045] In the embodiment of the present application, the battery connecting piece 100 has a symmetrical structure as a whole and a U-shaped design, which can effectively reduce the thickness of the battery connecting piece 100 by half, thereby improving the toughness of the battery connecting piece 100. Combined with the design of the arc-shaped bending portion 110 and the bendable tab connecting piece 122 and the pole connecting piece 121, multiple folding at multiple angles can be achieved, thereby improving the utilization rate of the internal space of the battery casing.

[0046] In one embodiment, if Figure 1-Figure 2 As shown, the thickness of the battery connecting piece 100 is 0.2 mm-0.8 mm.

[0047] In one embodiment, if Figure 1-Figure 2 As shown, the arc diameter of the arc-shaped bending portion 110 is 0.5mm-4mm. This design can better facilitate the two L-shaped connecting pieces 120 to be folded about the arc-shaped bending portion 110 and offset the stress after bending.

[0048] In one embodiment, if Figure 1 and Figure 3-Figure 5 As shown, the pole connecting piece 121 is provided with an embossing 1211. The design of the embossing 1211 facilitates welding the pole connecting piece 121 to the pole of the cover plate 300, thereby increasing the contact area between the two and the strength after welding.

[0049] Specifically, the shape of the embossing 1211 is rectangular, diamond-shaped or circular, with a depth of 0.1 mm to 0.2 mm, and the film is pulled inward by 10° to 60°.

[0050] In one embodiment, if Figure 1 and Figure 2 As shown, the arc-shaped bending portion 110 and the two L-shaped connecting pieces 120 are an integrated structure, which is formed by stamping a metal sheet. Such a design is easy to process and manufacture.

[0051] In one embodiment, if Figure 1-Figure 3 As shown, a groove 1201 is provided at the connection between the pole connecting piece 121 and the tab connecting piece 122 , and the pole connecting piece 121 and the tab connecting piece 122 can be bent at the groove 1201 .

[0052] By providing the groove 1201, Figure 3-Figure 4 Secondary bending and Figure 4-Figure 5 Three bends to improve the bending effect.

[0053] According to another aspect of the present application, an embodiment of the present application further provides a battery cell, such as Figure 9 As shown, the battery cell includes a winding core 200, a cover plate 300, and the battery connecting piece 100 in any of the above embodiments. The tab connecting piece 122 is welded to the tab on the winding core 200, and the pole connecting piece 121 is welded to the pole on the cover plate 300. The tabs of two winding cores 200 are connected in parallel to the tab connecting piece 122 of one battery connecting piece 100.

[0054] According to another aspect of the present application, an embodiment of the present application further provides a battery, characterized in that it includes a housing and the battery cell in the above embodiment, and the battery cell is placed in the housing.

[0055] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A battery connecting piece, characterized in that: It includes an arc-shaped bending portion and two L-shaped connecting pieces symmetrically connected on both sides of the arc-shaped bending portion, and the two L-shaped connecting pieces can be folded in half about the arc-shaped bending portion; the L-shaped connecting piece includes a pole connecting piece that can be bendably connected to the arc-shaped bending portion and a tab connecting piece that can be bendably connected to the pole connecting piece. When the pole connecting piece and the tab connecting piece are not bent, the pole connecting piece and the tab connecting piece are located in the same plane.

2. The battery connecting piece according to claim 1, characterized in that: The thickness of the battery connecting piece is 0.2mm-0.8mm.

3. The battery connecting piece according to claim 1, characterized in that: The arc diameter of the arc-shaped bending portion is 0.5mm-4mm.

4. The battery connecting piece according to claim 1, characterized in that: The pole connecting piece is provided with embossing.

5. The battery connecting piece according to claim 4, characterized in that: The embossing is in the shape of a rectangle, a diamond or a circle, with a depth of 0.1 mm to 0.2 mm, and the film is pulled inwards by 10° to 60°.

6. The battery connecting piece according to claim 1, characterized in that: The arc-shaped bending portion and the two L-shaped connecting pieces are an integrated structure and are formed by stamping a metal sheet.

7. The battery connecting piece according to claim 1, characterized in that: A groove is provided at the connection between the pole connecting piece and the tab connecting piece, and the pole connecting piece and the tab connecting piece can be bent at the groove.

8. A battery cell, characterized in that: The battery comprises a winding core, a cover plate and a battery connecting piece according to any one of claims 1 to 7, wherein the tab connecting piece is welded to the tab on the winding core, and the pole connecting piece is welded to the pole on the cover plate.

9. A battery, characterized in that: The invention comprises a housing and the battery core as claimed in claim 8, wherein the battery core is placed in the housing.

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