Connector structure and single cell

Abstract

This disclosure provides a connecting piece structure and a single battery cell; the connecting piece structure includes a tab connecting portion and a terminal welding portion, the tab connecting portion being connected to the terminal welding portion; the terminal welding portion has a terminal welding area and a laser injection area; the terminal welding area is located on one side of the terminal welding portion; the laser injection area is located on the other side of the terminal welding portion and is correspondingly arranged to the terminal welding area; a disordered micro-pit structure is formed in the laser injection area, the disordered micro-pit structure is dense and disordered, so that the laser injected into the laser injection area can reduce reflection under the action of the disordered micro-pit structure, so that more laser can be received and absorbed into the terminal welding portion, and a small portion of the reflected laser will also be dispersed.

Description

Technical Field

[0001] This disclosure relates to the technical field of batteries, and in particular to a connecting piece structure and a single cell battery. Background Technology

[0002] To extract the current from the cell assembly in a single battery cell, most manufacturers primarily use connecting tabs, such as those disclosed in Chinese patent document CN113346200A. These connecting tabs are used to connect the tabs to the cell assembly's terminals, and conductive terminals are then laser-welded onto the connecting tabs using a laser head. However, because the connecting tabs are made of conductive metal and are reflective, the laser light is significantly reflected when it comes into contact with the surface of the connecting tabs, leading to poor welding. Therefore, please refer to [further details omitted]. Figure 1 A small number of manufacturers process grid-like textures on the connecting pieces to reduce laser reflection. However, due to the grid-like texture structure design, a small amount of laser reflection may still aggregate and cause the temperature to rise. The aggregated lasers act on the laser head surface absorbing material and burn out the laser head. This increases the frequency of laser head repair or replacement, leading to increased production costs. Utility Model Content

[0003] The purpose of this disclosure is to overcome the shortcomings of the prior art and to provide a connecting piece structure and a single cell that reduces the reflection of light during laser welding.

[0004] The purpose of this disclosure is achieved through the following technical solution:

[0005] A connecting piece structure includes a tab connecting part and a terminal welding part, wherein the tab connecting part is connected to the terminal welding part, and the tab connecting part is used to connect to the tab of a battery cell assembly;

[0006] The terminal welding part has a terminal welding area and a laser injection area; the terminal welding area is located on one side of the terminal welding part and is used to contact the conductive terminal; the laser injection area is located on the other side of the terminal welding part and is correspondingly arranged with the laser injection area; a disordered micro-pit structure is formed in the laser injection area, and the disordered micro-pit structure is used to receive the laser light injected into the laser injection area so that the terminal welding area is laser welded to the conductive terminal.

[0007] In some embodiments, the disordered micro-pit structure is a micrometer-scale pit structure.

[0008] In some embodiments, the disordered micro-pit structure includes a plurality of pits, the diameter of which is 50 micrometers to 99 micrometers.

[0009] In some embodiments, the thickness of the disordered micro-pit structure is at least 0.5 mm; and / or,

[0010] The roughness of the disordered micro-pit structure is Ra3 to Ra10.

[0011] In some embodiments, the surface of the disordered micro-pit structure is also coated with a hardened coating.

[0012] In some embodiments, the thickness of the hardened coating is at least 2 micrometers; and / or,

[0013] The hardened coating is a titanium aluminum nitride coating; and / or

[0014] The hardness of the hardened coating is greater than or equal to 2500 HV.

[0015] In some embodiments, the disordered micro-pit structure is distributed in a stepped pattern; or,

[0016] The disordered micro-pit structure is distributed in a wrinkled manner; or...

[0017] The disordered micro-pit structure includes several pits, and the edges of the pits have scale-like protrusions.

[0018] In some embodiments, the disordered micro-pit structure is a laser-processed structure, a mold embossing structure, or a layered etching structure.

[0019] In some embodiments, the disordered micro-pit structure is a scale pattern structure, a leather pattern structure, and an electrode pattern structure.

[0020] A single battery cell includes a cell assembly, conductive terminals, and a connecting tab structure according to any of the above embodiments; the tabs of the cell assembly are connected to the tab connection portion, and the terminal welding area is laser-welded to the conductive terminal.

[0021] Compared with the prior art, this disclosure has at least the following advantages:

[0022] The aforementioned connecting plate structure, due to the formation of a disordered micro-pit structure within the laser injection area, and the fact that the disordered micro-pit structure is more dense and disordered compared to the grid-like texture of existing technologies, allows the laser entering the laser injection area to have reduced reflection under the action of the disordered micro-pit structure. This enables more laser light to be received and absorbed into the terminal welding part, and the small portion of the reflected laser light is also dispersed, meaning that the reflected laser light has a lower temperature, thereby effectively reducing the occurrence of the reflected laser light burning out the laser head. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A real-world image of a traditional connecting piece with a grid-like texture.

[0025] Figure 2 This is a schematic diagram of the connecting piece structure according to an embodiment of the present disclosure;

[0026] Figure 3 This is a schematic diagram of the structure of the flying scale pattern according to an embodiment of the present disclosure;

[0027] Figure 4 for Figure 3 The image shown is a physical representation of the flying scale pattern.

[0028] Figure 5 This is a schematic diagram of the leather texture structure according to an embodiment of the present disclosure;

[0029] Figure 6 This is a schematic diagram of the electrode texture structure according to an embodiment of the present disclosure;

[0030] Figure 7 To be Figure 6 The electrode texture structure is shown in the physical diagram of its application to the connecting piece structure.

[0031] Figure label:

[0032] 100. Connecting piece structure; 110. Electrode connecting part; 120. Terminal welding part; 1201. Terminal welding area; 1202. Laser injection area; 1212. Disordered micro-pit structure. Detailed Implementation

[0033] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] 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 disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0037] Please see Figure 2 One embodiment of the connecting piece structure 100 includes a tab connection portion 110 and a terminal welding portion 120. The tab connection portion 110 is connected to the terminal welding portion 120, and the tab connection portion 110 is used to connect to the tab of a battery cell assembly (not shown). The terminal welding portion 120 has a terminal welding area 1201 and a laser injection area 1202. The terminal welding area 1201 is located on one side of the terminal welding portion 120 and is used to contact a conductive terminal (not shown). The laser injection area 1202 is located on the other side of the terminal welding portion 120 and is correspondingly disposed to the terminal welding area 1201. A disordered micro-pit structure 1212 is formed in the laser injection area 1202. The disordered micro-pit structure 1212 is used to receive the laser light injected into the laser injection area 1202 so that the terminal welding area 1201 is laser welded to the conductive terminal. As an example, the connecting piece structure 100 can be a metal part such as a copper part or an aluminum part.

[0038] It is understandable that because a disordered micro-pit structure 1212 is formed in the laser injection area 1202, and the disordered micro-pit structure 1212 is more dense and disordered than the grid texture of the prior art, the laser injected into the laser injection area 1202 can reduce reflection under the action of the disordered micro-pit structure 1212, so that more laser can be received and absorbed into the terminal welding part 120, and the small part of the reflected laser will also be dispersed, that is, the temperature of the reflected laser is lower, thereby effectively reducing the occurrence of the reflected laser burning the laser head.

[0039] It is understandable that, since the terminal welding area 1201 located on one side of the terminal welding part 120 is correspondingly provided with the laser injection area 1202 located on the other side of the terminal welding part 120, the laser absorbed into the terminal welding part 120 can heat up the terminal welding area 1201. When the terminal welding area 1201 comes into contact with the conductive terminal, the heating of the terminal welding area 1201 can enable the conductive terminal to be laser welded to the terminal welding area 1201, and finally the conductive terminal is installed on the terminal welding part 120.

[0040] In some embodiments, the disordered micro-pit structure 1212 is a micrometer-scale pit structure. It is understood that in the prior art, lattice textures are generally millimeter-scale; specifically, the width of a lattice in a lattice texture is generally 1.2 millimeters. The disordered micro-pit structure 1212, being a micrometer-scale pit structure, has a texture much smaller than that of a lattice texture. This results in the disordered micro-pit structure 1212 having significantly less reflectivity than a lattice texture, further reducing the reflection effect after the laser enters the laser injection area 1202. Furthermore, the diffuse reflection effect of the laser after reflection is enhanced, meaning the laser is more dispersed after reflection, further reducing the damage to the laser head caused by the reflected laser.

[0041] In some embodiments, the disordered micro-pit structure 1212 includes a plurality of pits with a diameter of 50 micrometers to 99 micrometers. It is understood that the pit diameter of 50 to 99 micrometers in the disordered micro-pit structure 1212 can greatly increase the compactness of the disordered micro-pit structure 1212. Specifically, the pit diameter can be 50 micrometers, 75 micrometers, or 99 micrometers. Further, the plurality of pits are randomly distributed within the laser injection region 1202. In other embodiments, the disordered micro-pit structure 1212 also includes a plurality of protrusions, each protrusion being randomly misaligned with each pit within the laser injection region 1202.

[0042] In some embodiments, the thickness of the disordered micro-pit structure 1212 is at least 0.5 mm. It is understood that because the thickness of the disordered micro-pit structure 1212 is at least 0.5 mm, the tolerance of the disordered micro-pit structure 1212 to laser light can be improved.

[0043] In some embodiments, the roughness of the disordered micro-pit structure 1212 is Ra3 to Ra10. It is understood that because the roughness of the disordered micro-pit structure 1212 is Ra3 to Ra10, the diffuse reflection of laser light on the disordered micro-pit structure 1212 can be effectively improved, allowing the reflected laser light to be scattered in various directions, thereby reducing the concentration of the reflected laser light and further reducing the occurrence of the reflected laser light burning out the laser head. By way of example only, the roughness of the disordered micro-pit structure 1212 may be Ra3, Ra7, or Ra10.

[0044] In some embodiments, the surface of the disordered micro-pit structure 1212 is further coated with a hardening coating. It is understood that because the surface of the disordered micro-pit structure 1212 is coated with a hardening coating, the hardness of the disordered micro-pit structure 1212 can be increased, thereby improving its resistance to laser light. Specifically, the thickness of the hardening coating is at least 2 micrometers. Further, the hardening coating can be a titanium aluminum nitride coating, etc., and those skilled in the art can make other selections as needed.

[0045] In some embodiments, the hardness of the hardened coating is greater than or equal to 2500 HV. It is understood that, because the hardness of the hardened coating is greater than or equal to 2500 HV, by applying the hardened coating to the surface of the disordered micro-pit structure 1212, the hardness of the disordered micro-pit structure 1212 can reach 2500 HV, thereby improving the laser resistance of the disordered micro-pit structure 1212.

[0046] Please see Figure 3 and Figure 4 In some embodiments, the disordered micro-pit structure 1212 is a scale-like texture structure. The processing technology for the scale-like texture structure is as follows: First, a pulsed fiber laser is used to pre-treat the substrate surface, forming pit surfaces through scanning; then, the substrate is immersed in an acidic expanding agent for chemical expanding treatment, selectively etching and expanding the pit surfaces into biomimetic scale-like three-dimensional protrusions; finally, a hardening coating is applied to the textured surface using physical vapor deposition technology, increasing the surface hardness after treatment to achieve composite strengthening of the biomimetic structure and the high-performance coating. The disordered micro-pit structure 1212 is a laser-processed structure, comprising several pits with scale-like protrusions at the edges.

[0047] Please see Figure 5 In some embodiments, the disordered micro-dimple structure 1212 is a leather texture structure. The processing technology for the leather texture structure is as follows: First, digital modeling is performed, generating random texture paths based on 3D scan data of real leather. Then, multi-axis laser engraving is used, employing a five-axis laser device to process along the generated paths, dynamically adjusting the focus offset to form natural wrinkles. Next, silicone transfer molding is performed, coating the processed surface with a silicone layer, allowing it to cure, and then peeling it off, thereby accurately replicating the texture onto the mold surface. Finally, the texture on the mold surface is precisely embossed onto the laser injection area 1202 of the terminal welding portion 120. The disordered micro-dimple structure 1212 is a mold embossing structure with a stepped, wrinkled distribution.

[0048] Please see Figures 6 to 7In some embodiments, the disordered micro-pit structure 1212 is an electrode texture structure. The manufacturing process of the electrode texture structure is as follows: First, pretreatment is performed by mirror polishing the mold surface and thoroughly removing oil stains through ultrasonic cleaning; next, a mask is fabricated by uniformly coating the mold surface with a photosensitive resist and forming a grid mask pattern through ultraviolet exposure; then, a stepped etching stage is entered, first using ferric chloride etching solution to process to a first depth, and second using a nitric acid-copper sulfate mixed etching solution to process to a second depth, forming a three-dimensional micro-stepped structure; finally, post-treatment is performed to remove mask residue and eliminate burrs through electrolytic polishing to ensure surface smoothness. The disordered micro-pit structure 1212 exhibits a stepped, hierarchical etching structure.

[0049] Please see Figure 2 This disclosure also provides a single-cell battery, including a cell assembly, conductive terminals, and a connecting tab structure 100 of any of the above embodiments; the tabs of the cell assembly are connected to the tab connection portion 110, and the terminal welding area 1201 is laser-welded to the conductive terminals. It can be understood that by applying the connecting tab structure 100 of this disclosure to a single-cell battery, the tabs of the cell assembly are connected to the tab connection portion 110. Specifically, the tabs of the cell assembly are welded to the tab connection portion 110 to achieve electrical connection, and the terminal welding area 1201 is laser-welded to the conductive terminals to achieve electrical connection, ultimately resulting in the conductive terminals being electrically connected to the tabs of the cell assembly.

[0050] Compared with the prior art, this disclosure has at least the following advantages:

[0051] 1) Because a disordered micro-pit structure 1212 is formed in the laser injection area 1202, and the disordered micro-pit structure 1212 is more dense and disordered than the grid texture of the prior art, the laser injected into the laser injection area 1202 can reduce reflection under the action of the disordered micro-pit structure 1212, so that more laser can be received and absorbed into the terminal welding part 120, and the small part of the reflected laser will also be dispersed, that is, the temperature of the reflected laser is lower, thereby effectively reducing the occurrence of the reflected laser burning the laser head.

[0052] 2) Since the terminal welding area 1201 located on one side of the terminal welding part 120 is correspondingly provided with the laser injection area 1202 located on the other side of the terminal welding part 120, the laser absorbed into the terminal welding part 120 can heat up the terminal welding area 1201. When the terminal welding area 1201 comes into contact with the conductive terminal, the heating of the terminal welding area 1201 can laser weld the conductive terminal to the terminal welding area 1201, and finally the conductive terminal is installed on the terminal welding part 120.

[0053] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A connecting piece structure, comprising a tab connecting portion and a terminal welding portion, wherein the tab connecting portion is connected to the terminal welding portion, and the tab connecting portion is used to connect to the tab of a battery cell assembly; Its features are, The terminal welding part has a terminal welding area and a laser injection area; the terminal welding area is located on one side of the terminal welding part and is used to contact the conductive terminal; the laser injection area is located on the other side of the terminal welding part and is correspondingly arranged with the terminal welding area; a disordered micro-pit structure is formed in the laser injection area, and the disordered micro-pit structure is used to receive the laser light injected into the laser injection area so that the terminal welding area is laser welded to the conductive terminal.

2. The connecting piece structure according to claim 1, characterized in that, The disordered micro-pit structure is a micrometer-scale pit structure.

3. The connecting piece structure according to claim 2, characterized in that, The disordered micro-pit structure includes a number of pits, the diameter of which is 50 micrometers to 99 micrometers.

4. The connecting piece structure according to claim 1, characterized in that, The thickness of the disordered micro-pit structure is at least 0.5 mm; and / or, The roughness of the disordered micro-pit structure is Ra3 to Ra10.

5. The connecting piece structure according to claim 1, characterized in that, The surface of the disordered micro-pit structure is also coated with a hardened coating.

6. The connecting piece structure according to claim 5, characterized in that, The thickness of the hardened coating is at least 2 micrometers; and / or, The hardened coating is a titanium aluminum nitride coating; and / or The hardness of the hardened coating is greater than or equal to 2500 HV.

7. The connecting piece structure according to claim 1, characterized in that, The disordered micro-pit structure is distributed in a stepped pattern; or... The disordered micro-pit structure is distributed in a wrinkled manner; or... The disordered micro-pit structure includes several pits, and the edges of the pits have scale-like protrusions.

8. The connecting piece structure according to claim 1, characterized in that, The disordered micro-pit structure is a laser-processed structure, a mold embossing structure, or a layered etching structure.

9. The connecting piece structure according to claim 1, characterized in that, The disordered micro-pit structure is a scale pattern structure, a leather pattern structure, and an electrode pattern structure.

10. A single-cell battery, characterized in that, It includes a battery cell assembly, conductive terminals, and a connecting piece structure as described in any one of claims 1 to 9; the electrode of the battery cell assembly is connected to the electrode connecting portion, and the terminal welding area is laser welded to the conductive terminal.

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