Battery current collecting component, battery top cover structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery current collecting component, a battery top cover structure and a battery, the battery current collecting component comprises a current collecting component body, the current collecting component body comprises a first surface and a second surface which are oppositely arranged, and the second surface of the current collecting component body is provided with an annular groove; the part, corresponding to the annular groove, of the first face of the current collecting component body is used for being attached to a battery pole, and when laser welding is conducted on the groove bottom of the annular groove, formed welding marks are located in the annular groove. In other words, laser irradiation can be conducted on the groove bottom of the annular groove, so that the current collecting component body is welded to the battery pole, and a welding mark is formed in the annular groove. Due to the fact that the welding mark does not extend out of the annular groove, the patch can be completely attached to the second face of the current collecting component body, and the welding mark can be covered by sealing the annular groove. And a gap is prevented from being generated between the patch and the second surface of the current collecting component body, so that the electrolyte is prevented from being in contact with the welding mark through the gap.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery current collector, a battery top cover structure, and a battery. Background Technology

[0002] The current collector is a crucial component inside the battery, primarily used to connect the battery tabs of the electrode assembly to the external battery terminals, enabling the transmission and distribution of electrical energy. The current collector and battery terminals are often connected using laser welding. Specifically, after the contact surface of the current collector is attached to the battery terminal, laser welding is performed on the working surface of the current collector, the side furthest from the battery terminal, creating a solder mark. To prevent the electrolyte from reacting with the solder mark and causing it to blacken or even be damaged, a patch is often attached to the working surface of the current collector to cover the solder mark.

[0003] However, because the weld marks produced by laser welding are raised on the working surface of the battery current collector, the patch is difficult to completely adhere to the working surface of the battery current collector and may produce gaps. The electrolyte may come into contact with the weld marks through the gap between the patch and the working surface of the battery current collector. Utility Model Content

[0004] In view of this, this application provides a battery current collector to solve or improve the problem that electrolyte may come into contact with solder through the gap between the patch and the side of the battery current collector away from the battery terminal.

[0005] In a first aspect, this application provides a battery current collector component, including a current collector component body, the current collector component body including a first surface and a second surface disposed opposite to each other, an annular groove being provided on the second surface of the current collector component body, a portion on the first surface of the current collector component body corresponding to the annular groove being used to fit with a battery terminal post, and when laser welding is performed on the bottom of the annular groove, the weld mark formed is located within the annular groove.

[0006] Optionally, the bottom of the annular groove is provided with a first annular protrusion, the height of which is lower than the second surface of the current collecting component body.

[0007] Optionally, the bottom of the annular groove is further provided with a second annular protrusion, the height of which is lower than that of the first annular protrusion.

[0008] Optionally, the bottom of the annular groove is further provided with a third annular protrusion, the height of which is lower than that of the first annular protrusion.

[0009] Optionally, the second annular protrusion and the third annular protrusion are located on the periphery and inner periphery of the first annular protrusion, respectively.

[0010] Optionally, it also includes:

[0011] A tab connecting plate is connected to the current collector body, and the tab connecting plate is adapted to be connected to the battery tab.

[0012] Secondly, this application also provides a battery top cover structure, including: a top cover, a battery terminal, any of the above-described battery current collectors and a patch, wherein the battery terminal is disposed on the top cover, the current collector body is welded to the battery terminal, and the weld mark of the current collector body and the battery terminal is located in the annular groove, and the patch is disposed on the second surface of the current collector body of the battery current collector and covers the annular groove.

[0013] Optionally, the patch is annular, with the outer ring of the patch located around the outer ring of the annular groove, and the inner ring of the patch located around the inner ring of the annular groove.

[0014] Optionally, the battery terminals include an inner terminal and an outer terminal connected to each other, the outer terminal extending out of the top cover, and an insulating element provided between the inner terminal and the top cover.

[0015] Thirdly, this application also provides a battery, including any of the battery top cover structures described above.

[0016] This application provides a battery current collector component, including a current collector component body. The current collector component body includes a first surface and a second surface disposed opposite to each other. An annular groove is provided on the second surface of the current collector component body. The portion on the first surface of the current collector component body corresponding to the annular groove is used to adhere to the battery terminal. When laser welding is performed on the bottom of the annular groove, the weld mark formed is located within the annular groove. That is, the current collector component body can be welded to the battery terminal by laser irradiation of the bottom of the annular groove. During the laser welding operation on the bottom of the annular groove, a weld mark is formed within the annular groove, meaning that although the weld mark protrudes to a certain height, it does not extend beyond the annular groove. Thus, by attaching a patch to the second surface of the current collector component body and sealing the annular groove, the weld mark can be covered, and the patch can be completely attached to the second surface of the current collector component body, avoiding gaps between the patch and the second surface of the current collector component body, thereby preventing electrolyte from contacting the weld mark through gaps. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a battery current collector according to an embodiment of this application;

[0019] Figure 2 This is a cross-sectional schematic diagram of a battery current collector according to an embodiment of this application;

[0020] Figure 3 This is a cross-sectional schematic diagram of a battery current collector component after a patch has been applied, according to an embodiment of this application.

[0021] Figure 4 This is a schematic diagram of the structure of a battery current collector after a patch has been applied according to an embodiment of this application.

[0022] Figure 5 This is a schematic diagram of a battery top cover structure according to an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Current collector body; 2. Annular groove; 3. First annular protrusion; 4. Second annular protrusion; 5. Third annular protrusion; 6. Terminal tab connecting plate; 7. Top cover; 8. Battery terminal post; 81. Outer terminal post; 82. Inner terminal post; 9. Patch; 10. Insulating component. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The following is combined with Figures 1 to 5 This describes an embodiment of the present application.

[0027] According to embodiments of this application, on the one hand, such as Figures 1 to 3 As shown, a battery current collector is provided, including a current collector body 1. The current collector body 1 includes a first surface and a second surface disposed opposite to each other. The first surface of the current collector body 1 is used to fit against a battery terminal 8, and the second surface of the current collector body 1 is used for laser welding operations.

[0028] An annular groove 2 is formed on the second surface of the current collector body 1. When the current collector body 1 needs to be welded to the battery terminal 8, the part of the current collector body 1 corresponding to the annular groove 2 is attached to the battery terminal 8, and then laser welding is performed on the bottom of the annular groove 2, so that the current collector body 1 is welded to the battery terminal 8. During the laser irradiation welding operation on the bottom of the annular groove 2, a weld mark is formed in the annular groove 2. Although the weld mark is raised to a certain height, it is still located within the annular groove 2 and does not protrude from the annular groove 2. In this way, the weld mark can be covered by attaching the patch 9 to the second surface of the current collector body 1 and sealing the annular groove 2. Since the weld mark does not protrude from the annular groove 2, the patch 9 can be completely attached to the second surface of the current collector body 1, avoiding gaps between the patch 9 and the second surface of the current collector body 1, thereby preventing the electrolyte from contacting the weld mark through gaps. This prevents the weld mark from reacting with the electrolyte and turning black or even being damaged.

[0029] In one embodiment, such as Figure 1 and Figure 2 As shown, a first annular protrusion 3 is provided at the bottom of the annular groove 2, and the height of the first annular protrusion 3 is lower than the second surface of the current collector body 1. When it is necessary to weld the current collector body 1 to the battery terminal 8, the part on the first surface of the current collector body 1 corresponding to the annular groove 2 is attached to the battery terminal 8, and then laser welding is performed on the bottom of the annular groove 2, so that the current collector body 1 is welded to the battery terminal 8. During the laser welding operation on the bottom of the annular groove 2, the first annular protrusion 3 melts and forms a weld mark on the bottom of the annular groove 2, making the weld mark smoother. Moreover, since there is a height difference between the top of the first annular protrusion 3 and the bottom of the annular groove 2, the laser absorption rate of the current collector is increased, avoiding problems such as the current collector breaking due to the high laser pressure.

[0030] In a further embodiment, such as Figure 1 and Figure 2 As shown, a second annular protrusion 4 is also provided at the bottom of the annular groove 2, making the second annular protrusion 4 lower than the first annular protrusion 3. During laser welding of the bottom of the annular groove 2, the first annular protrusion 3 and the second annular protrusion 4 melt and form a weld mark at the bottom of the annular groove 2, making the weld mark smoother. Moreover, since there is a height difference between each pair of the tops of the first annular protrusion 3 and the second annular protrusion 4 and the bottom of the annular groove 2, the laser absorption rate of the current collector is further increased, avoiding problems such as explosion points caused by high laser pressure.

[0031] In a further embodiment, a third annular protrusion 5 is provided at the bottom of the annular groove 2, such that the third annular protrusion 5 is lower than the first annular protrusion 3. During laser welding of the bottom of the annular groove 2, the first annular protrusion 3, the second annular protrusion 4, and the third annular protrusion 5 melt and form a weld mark at the bottom of the annular groove 2, resulting in a smoother weld mark. Furthermore, since there are height differences between the tops of the first annular protrusion 3 and the third annular protrusion 5 and the bottom of the annular groove 2, the laser absorption rate of the current collector is further increased, preventing problems such as burn-out points caused by high laser intensity.

[0032] In optional embodiments, such as Figure 1 and Figure 2 As shown, the second annular protrusion 4 is located around the first annular protrusion 3, and the side of the second annular protrusion 4 away from the first annular protrusion 3 is integrally connected to the outer ring wall of the annular groove 2. The third annular protrusion 5 is located inside the first annular protrusion 3, and the side of the third annular protrusion 5 away from the first annular protrusion 3 is integrally connected to the inner ring wall of the annular groove 2. During laser welding of the bottom of the annular groove 2, the portions of the first annular protrusion 3, the second annular protrusion 4 near the first annular protrusion 3, and the third annular protrusion 5 near the first annular protrusion 3 melt and form a weld mark on the bottom of the annular groove 2, making the weld mark smoother. Furthermore, since there is a height difference between each pair of adjacent points in the top of the first annular protrusion 3, the top of the second annular protrusion 4, the top of the third annular protrusion 5, and the bottom of the annular groove 2, the laser absorption rate of the current collector is further increased, thus avoiding problems such as explosion points caused by high laser intensity in the current collector.

[0033] In one embodiment, such as Figure 1 As shown, the battery current collector also includes a tab connecting plate 6. The tab connecting plate 6 is connected to the current collector body 1, connecting the tab connecting plate 6 to the battery tabs, thereby connecting the current collector body 1 to the battery tabs through the tab connecting plate 6. Two tab connecting plates 6 can be provided, each connected to one side of the current collector body 1, and the two tab connecting plates 6 are located at opposite ends of one side of the current collector body 1.

[0034] According to embodiments of this application, another aspect also provides a battery top cover structure, such as... Figure 5As shown, the battery includes: a top cover 7, battery terminals 8, a patch 9, and any of the above-mentioned battery current collector components. The battery terminals 8 penetrate the top cover 7. The current collector component body 1 is welded to the battery terminals 8, and the weld marks between the current collector component body 1 and the battery terminals 8 are located within the annular groove 2. The patch 9 is placed on the second surface of the current collector component body 1 and covers the annular groove 2. The beneficial effects of this battery top cover structure are the same as those of the battery current collector component, so they will not be described in detail.

[0035] The portion of the current collector body 1 corresponding to the annular groove 2 is attached to the battery terminal 8. Then, laser welding is performed on the bottom of the annular groove 2, welding the current collector body 1 onto the battery terminal 8 and forming a solder mark within the annular groove 2. Because the solder mark does not protrude from the annular groove 2, the patch 9 can be completely attached to the second surface of the current collector body 1, preventing gaps between the patch 9 and the second surface of the current collector body 1. This prevents electrolyte from contacting the solder mark through gaps, thus avoiding a reaction between the solder mark and the electrolyte that could cause it to blacken or be damaged.

[0036] In one embodiment, such as Figures 1 to 4 As shown, the patch 9 is designed in a ring shape. When the patch 9 is placed on the second surface of the current collector body 1, the outer ring of the patch 9 is located outside the outer ring of the annular groove 2, while the inner ring of the patch 9 is located inside the inner ring of the annular groove 2. Thus, the annular patch 9 can cover the annular groove 2, saving material.

[0037] In one embodiment, such as Figure 5 As shown, the battery terminals 8 include an inner terminal 82 and an outer terminal 81. The inner terminal 82 and the outer terminal 81 are connected to each other and are located on the inner and outer sides of the top cover 7, respectively. The outer terminal 81 extends out of the top cover 7. The side of the inner terminal 82 closest to the top cover 7 abuts against the inner side of the top cover 7 through an insulating member 10, so that the insulating member 10 is located between the inner terminal 82 and the top cover 7, and plays an insulating role. The insulating member 10 can be a gasket made of insulating material.

[0038] According to an embodiment of this application, in another aspect, a battery is also provided, including any of the battery top cover structures described above. The beneficial effects of this battery are consistent with those of the battery top cover structure, and therefore will not be described again.

[0039] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery current collector, characterized in that, The current collector includes a current collector body (1), which includes a first surface and a second surface arranged opposite to each other. An annular groove (2) is provided on the second surface of the current collector body (1). The part on the first surface of the current collector body (1) corresponding to the annular groove (2) is used to fit with the battery terminal (8). When laser welding is performed on the bottom of the annular groove (2), the weld mark formed is located in the annular groove (2).

2. The battery current collector according to claim 1, characterized in that, The bottom of the annular groove (2) is provided with a first annular protrusion (3), and the height of the first annular protrusion (3) is lower than the second surface of the main body (1) of the flow collecting component.

3. The battery current collector according to claim 2, characterized in that, The bottom of the annular groove (2) is also provided with a second annular protrusion (4), the height of which is lower than that of the first annular protrusion (3).

4. The battery current collector according to claim 3, characterized in that, The bottom of the annular groove (2) is also provided with a third annular protrusion (5), the height of which is lower than that of the first annular protrusion (3).

5. The battery current collector according to claim 4, characterized in that, The second annular protrusion (4) and the third annular protrusion (5) are located on the periphery and inner periphery of the first annular protrusion (3), respectively.

6. The battery current collector according to claim 1, characterized in that, Also includes: The tab connecting plate (6) is connected to the current collector body (1), and the tab connecting plate (6) is adapted to be connected to the battery tab.

7. A battery top cover structure, characterized in that, include: The battery current collector and patch (9) are provided on the top cover (7), battery terminals (8), battery current collector as described in any one of claims 1-6, the battery terminals (8) are disposed on the top cover (7), the current collector body (1) is welded to the battery terminals (8), and the weld mark of the current collector body and the battery terminals (8) is located in the annular groove (2), and the patch (9) is disposed on the second surface of the current collector body (1) of the battery current collector and covers the annular groove (2).

8. The battery top cover structure according to claim 7, characterized in that, The patch (9) is annular, with the outer ring of the patch (9) located around the outer ring of the annular groove (2) and the inner ring of the patch (9) located around the inner ring of the annular groove (2).

9. The battery top cover structure according to claim 7, characterized in that, The battery terminal (8) includes an inner terminal (82) and an outer terminal (81) connected to each other. The outer terminal (81) extends out of the top cover (7). An insulating element (10) is provided between the inner terminal (82) and the top cover (7).

10. A battery, characterized in that, Includes the battery top cover structure as described in any one of claims 7-9.

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