Cover plate assembly and single battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a single battery, which comprises a cover plate body, a cover plate through hole and a cover plate, the electrode terminal at least partially penetrates through the cover plate through hole; the connecting piece is provided with a connecting area used for being welded with an electrode terminal, and the connecting piece is used for being connected with a tab led out from an electrode assembly; wherein the surface of the connecting area is provided with irregularly arranged concave-convex structures or the surface of the connecting area is provided with an anti-reflection layer. According to the technical scheme, the irregularly-arranged concave-convex structures or the anti-reflection layers are arranged on the surfaces of the connecting areas, the roughness of the connecting areas is increased, the reflection rate of laser irradiated on the connecting areas during laser welding is reduced, and therefore insufficient welding or poor welding caused by reflection is avoided, the welding effect is remarkably improved, and the welding quality is improved. And effective fusion depth and fusion width are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a single battery. Background Art

[0002] As the main power source of electric vehicles, the battery device is the core device in electric vehicles. The battery device is mainly used to store electrical energy and provide energy to electric vehicles. Existing battery devices usually use connecting pieces to connect electrode terminals and electrode assemblies, and the connecting pieces are generally fixed to the electrode terminals by laser welding. However, the connecting pieces are generally stamped thin sheets with relatively smooth stamping surfaces, so they are prone to false welding or poor welding due to reflection during the laser welding process, affecting the welding effect. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a cover plate assembly and a single cell, aiming to solve the problem that the stamping surface of the connecting piece is relatively smooth, which easily leads to false welding or poor welding due to reflection during the laser welding process.

[0004] The utility model provides a cover plate assembly, comprising:

[0005] A cover plate body, wherein the cover plate body is provided with a penetrating cover plate through hole;

[0006] an electrode terminal, wherein at least a portion of the electrode terminal passes through the cover plate through hole; and

[0007] A connecting piece, wherein the connecting piece is provided with a connecting area for welding with the electrode terminal, and the connecting piece is used to connect with the electrode lug led out from the electrode assembly; wherein,

[0008] The surface of the connection area is provided with irregularly arranged concave-convex structures,

[0009] or

[0010] The surface of the connection area is provided with an anti-reflective layer.

[0011] Optionally, the irregularly arranged concave-convex structure includes randomly arranged embossed patterns.

[0012] Optionally, the irregularly arranged concave-convex structure includes pits recessed into the surface of the connection area or convexities protruding out of the surface of the connection area.

[0013] Optionally, the depth of the pit sunken into the surface of the connection area is less than or equal to 0.1 mm; or,

[0014] The height of the protrusion protruding from the surface of the connection area is less than or equal to 0.1 mm.

[0015] Optionally, the depressions or protrusions have different cross-sectional shapes.

[0016] Optionally, the pits have different depths; or,

[0017] The protrusions have different heights.

[0018] Optionally, the depressions or protrusions have an irregular cross-sectional shape.

[0019] Optionally, the irregularly arranged concave-convex structure is formed by stamping, sandblasting, frosting, laser atomization or electric spark processing.

[0020] Optionally, the anti-reflective layer includes a pigment coating, a passivation layer or a nickel-plated layer formed on the surface of the connection area.

[0021] The utility model also provides a single battery, comprising:

[0022] case;

[0023] The cover plate assembly as described above, the cover plate assembly is disposed on the shell, and defines a receiving cavity together with the shell;

[0024] The electrode assembly is accommodated in the accommodation cavity.

[0025] The cover plate assembly of the utility model adopts the above technical solution to set irregularly arranged concave-convex structures or anti-reflective layers on the surface of the connection area, which can increase the roughness of the connection area and reduce the reflectivity of the laser irradiated on the connection area during laser welding, thereby avoiding false welding or poor welding caused by reflection, significantly improving the welding effect, and ensuring effective penetration depth and width. The irregularly arranged concave-convex structure has higher roughness, lower reflectivity, better welding effect, and is easier to process and has lower processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional diagram of the connecting piece of this embodiment;

[0027] Figure 2 is a top view of the connecting piece of this embodiment;

[0028] Figure 3 This is a schematic diagram of the connection state of the connecting piece of this embodiment;

[0029] Figure 4 It is an exploded schematic diagram of the connection state of the connection piece of this embodiment.

[0030] Description of reference numerals:

[0031] 11-connection area; 12-connection piece; 2-cover body; 3-electrode terminal. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0033] 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 belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0034] like Figures 1 to 4 As shown, this embodiment provides a cover plate assembly, including a cover plate body 2, an electrode terminal 3 and a connecting piece 12. The cover plate body 2 is provided with a cover plate through hole that runs through its thickness direction, and the electrode terminal 3 at least partially passes through the cover plate through hole. A connection area 11 for welding with the electrode terminal 3 is provided on one side of the connecting piece 12 along the thickness direction, and the other side of the connecting piece 12 along the thickness direction is connected to the pole ear led out of the electrode assembly. The connecting piece 12 is used to electrically connect the pole ear led out of the electrode assembly with the electrode terminal 3. The surface of the connection area 11 is provided with an irregularly arranged concave-convex structure, or the surface of the connection area 11 is provided with an anti-reflective layer. The reflectivity of the irregularly arranged concave-convex structure and the anti-reflective layer to the laser is lower than the original reflectivity of the surface of the connection area 11.

[0035] This embodiment can increase the roughness of the connection area 11 and reduce the reflectivity of the laser irradiated on the connection area 11 during laser welding by providing an irregularly arranged concave-convex structure or an anti-reflective layer on the surface of the connection area 11, thereby avoiding false welding or poor welding caused by reflection, significantly improving the welding effect, and ensuring effective penetration depth and width. The irregularly arranged concave-convex structure has higher roughness, lower reflectivity, better welding effect, and is easier to process and has lower processing costs.

[0036] In one embodiment, the connecting piece 12 is a negative electrode connecting piece, and the connecting area 11 of the negative electrode connecting piece is welded to the negative terminal. Since the negative electrode connecting piece is made of copper, the reflectivity of the copper surface is higher, so the laser reflectivity is higher during the laser welding process, which makes it easier for the negative electrode connecting piece and the negative terminal to have a cold weld or poor welding during welding, affecting the welding effect. The surface of the connecting area 11 of the negative electrode connecting piece is provided with an irregularly arranged concave-convex structure, or the surface of the connecting area 11 of the negative electrode connecting piece is provided with an anti-reflective layer. The reflectivity of the irregularly arranged concave-convex structure and the anti-reflective layer to the laser is lower than the original reflectivity of the surface of the connecting area 11. The above-mentioned setting method can increase the roughness of the connecting area 11 of the negative electrode connecting piece, so that the negative electrode connecting piece made of copper can avoid cold welding or poor welding caused by reflection during welding, significantly improve the welding effect, and ensure effective melting depth and width.

[0037] In one embodiment, the irregularly arranged concave-convex structure includes randomly arranged embossed patterns. In the stamping process, a punch head with regular patterns is usually formed by a machining process, and the manufacturing cost is relatively high. The punch head is soaked in a corrosive solution to form an irregular structure on the punch head, and the production cost is lower. The randomly arranged embossed patterns extruded by the punch head with an irregular pattern structure have a simple process and a low processing cost.

[0038] In one embodiment, the irregularly arranged concave-convex structure includes a pit that is recessed into the surface of the connection area 11 or a protrusion that protrudes from the surface of the connection area 11. Specifically, the pit is a depression that is recessed into the reference surface with the surface of the connection area 11 as the reference surface; the protrusion is a ridge that is protruded from the reference surface with the surface of the connection area 11 as the reference surface. The above-mentioned configurations can increase the roughness of the connection area 11.

[0039] In one embodiment, the depth of the concave pit into the surface of the connection area 11 is less than or equal to 0.1 mm; and / or the height of the protrusion protruding from the surface of the connection area 11 is less than or equal to 0.1 mm. Specifically, the pit takes the surface of the connection area 11 as the reference plane, and the depth below the reference plane is less than or equal to 0.1 mm; the protrusion takes the surface of the connection area 11 as the reference plane, and the height above the reference plane is less than or equal to 0.1 mm. Too large a height of the protrusion or a depth of the concave pit will affect the effect of laser welding, resulting in poor welding results. The above-mentioned setting method can not only avoid reflection during laser welding, but also avoid affecting the effect of laser welding due to excessive height or depth.

[0040] In one embodiment, the pits or protrusions are arranged in a disordered manner. Specifically, the disordered arrangement includes:

[0041] The individual dimples or protrusions are neither arranged in rows nor in columns; or

[0042] Along the length direction or width direction of the connection area 11, the distance between two adjacent pits is different or the distance between two adjacent protrusions is different; or

[0043] The pits or protrusions are neither arranged in a row nor in a column, and along the length direction or the width direction of the connection area 11, the distance between two adjacent pits or the distance between two adjacent protrusions are different.

[0044] The above configuration makes the surface roughness of the connection area 11 higher, the reflectivity lower, and the welding effect better.

[0045] In one embodiment, the pits or protrusions have different cross-sectional shapes. The cross-sectional shapes of each pit or each protrusion are different, which increases the roughness of the surface of the connection area 11, reduces the reflectivity, and improves the welding effect.

[0046] In one embodiment, the pits have different depths; and / or the protrusions have different heights. Specifically, each pit has a different depth, and / or each protrusion has a different height, which can increase the roughness of the surface of the connection area 11, reduce the reflectivity during laser welding, and achieve a better welding effect.

[0047] In one embodiment, the pit or protrusion has an irregular cross-sectional shape. Specifically, shapes whose area cannot be directly calculated using an area formula are all irregular shapes. The above arrangement can reduce the processing difficulty and processing cost, increase the surface roughness of the connection area 11, reduce the reflectivity during laser welding, and achieve better welding effect.

[0048] In one embodiment, the opening cross-sectional areas of the recesses are different, or the maximum cross-sectional areas of the protrusions are different.

[0049] In one embodiment, the irregularly arranged concave-convex structure is formed by stamping, sandblasting, grinding, laser atomization or electric spark processing. The above processing methods are simple and have low processing costs.

[0050] In one embodiment, the anti-reflective layer includes a pigment coating, a passivation layer or a nickel-plated layer formed on the surface of the connection area 11, and the color of the pigment coating is a color with a lower reflectivity than copper. The pigment coating, the passivation layer or the nickel-plated layer has a lower reflectivity, so that the laser welding effect is better.

[0051] This embodiment also provides a single cell battery, including:

[0052] case;

[0053] As described in the above embodiment, the cover plate assembly is disposed on the top opening of the shell, and defines a receiving cavity together with the shell;

[0054] The electrode assembly is accommodated in the accommodation cavity.

[0055] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate body, wherein the cover plate body is provided with a penetrating cover plate through hole; an electrode terminal, wherein at least a portion of the electrode terminal passes through the cover plate through hole; as well as A connecting piece, wherein the connecting piece is provided with a connecting area for welding with the electrode terminal, and the connecting piece is used to connect with the electrode lug led out from the electrode assembly; wherein, The surface of the connection area is provided with irregularly arranged concave-convex structures, The irregularly arranged concave-convex structure includes pits sunken into the surface of the connection area or convexities protruding from the surface of the connection area, The pits or protrusions are arranged in a disordered manner, and the depth of the pits sunken into the surface of the connection area is less than or equal to 0.1 mm; or The surface of the connection area is provided with an anti-reflection layer, and the anti-reflection layer includes a pigment coating, a passivation treatment layer or a nickel plating layer formed on the surface of the connection area.

2. The cover plate assembly according to claim 1, characterized in that: The irregularly arranged concave-convex structure includes randomly arranged embossed patterns.

3. The cover plate assembly according to claim 1, characterized in that: The height of the protrusion protruding from the surface of the connection area is less than or equal to 0.1 mm.

4. The cover plate assembly according to claim 1, characterized in that: The depressions or protrusions have different cross-sectional shapes.

5. The cover plate assembly according to claim 1, wherein: The pits have different depths; or, The protrusions have different heights.

6. The cover plate assembly according to claim 1, characterized in that: The depressions or protrusions have irregular cross-sectional shapes.

7. The cover plate assembly according to any one of claims 1 to 6, characterized in that: The irregularly arranged concave-convex structure is formed by stamping, sandblasting, frosting, laser atomization or electric spark processing.

8. A single cell battery, characterized in that: include: case; The cover plate assembly according to any one of claims 1 to 7, wherein the cover plate assembly is disposed on the shell and defines a receiving cavity together with the shell; The electrode assembly is accommodated in the accommodation cavity.

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