Top cover assembly and battery

Abstract

The utility model provides a top cover assembly and a battery. The top cover assembly comprises a top cover, a connecting piece and an adhesive layer, the connecting piece is arranged on one side of the top cover, the connecting piece and the top cover are connected through welding, the adhesive layer is connected to the side, away from the top cover, of the connecting piece and / or the side, away from the connecting piece, of the top cover, and the orthographic projection of the adhesive layer at the welding position of the connecting piece and the top cover at least partially coincides with the welding position. According to the top cover assembly, when the top cover and the connecting piece are welded, the adhesive layer is affected by the heated connecting piece and the top cover to be melted, and the adhesive layer can also be directly heated and melted through welding equipment. Due to the fact that the orthographic projection of the adhesive layer at the welding position is at least partially overlapped with the welding position, after the adhesive layer is melted, the adhesive layer in the molten state can be attached to the top cover and / or the connecting piece and cover the welding position, the adhesive layer can play a role in blocking welding slag, prevent the welding slag from splashing and avoid the situation that the battery is short-circuited due to the fact that the welding slag splashes, and the service life of the battery is prolonged. And the reliability of the battery is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a top cover assembly and a battery. Background Art

[0002] During the production process of a battery, it is necessary to weld the top cover and the connecting piece together.

[0003] In the related art, during the welding process of the connecting piece, slag spatter is likely to occur, resulting in problems such as battery short circuit. Summary of the Utility Model

[0004] Embodiments of this application provide a top cover assembly and a battery, which can improve the technical problem that slag spatter is likely to occur during the welding process of the connecting piece, resulting in problems such as battery short circuit.

[0005] In a first aspect, embodiments of this application provide a top cover assembly, including:

[0006] A top cover;

[0007] A connecting piece, disposed on one side of the top cover, and the connecting piece and the top cover are connected by welding;

[0008] An adhesive layer, the adhesive layer is connected to the side of the connecting piece facing away from the top cover and / or the side of the top cover facing away from the connecting piece, and the orthographic projection of the adhesive layer at the welding position of the connecting piece and the top cover coincides with at least part of the welding position.

[0009] In one embodiment, the connecting piece and the top cover are connected by laser welding, and the adhesive layer is used for laser transmission.

[0010] In one embodiment, the adhesive layer covers the welding position.

[0011] In one embodiment, the connecting piece includes a welding portion, the welding portion is concave towards the top cover side to form a first groove, and the welding portion is connected to the top cover by laser welding.

[0012] In one embodiment, at least part of the adhesive layer is located in the first groove.

[0013] In one embodiment, the top cover is provided with a second groove, the welding portion is disposed in the second groove, and the welding portion is connected to the wall surface of the second groove by laser welding.

[0014] In one embodiment, the connecting piece is provided with a receiving groove for receiving the adhesive layer.

[0015] In one embodiment, the depth of the receiving groove is greater than the thickness of the adhesive layer.

[0016] In one embodiment, the thickness of the adhesive layer is 2 mm - 4 mm.

[0017] In a second aspect, an embodiment of the present application provides a battery, including the above-mentioned top cover assembly.

[0018] In a third aspect, an embodiment of the present application provides an electrical equipment, including the above-mentioned battery.

[0019] Beneficial effects of the embodiments of the present application:

[0020] In the embodiment of the present application, the connecting piece and the top cover are welded and connected together from one side of the adhesive layer. During welding, the adhesive layer is melted under the influence of the heated connecting piece and top cover, or the welding equipment directly heats the adhesive layer and melts it. Since the orthographic projection of the adhesive layer at the welding position coincides with at least part of the welding position, after the adhesive layer melts, the molten adhesive layer will adhere to the top cover and / or the connecting piece and cover the welding position. The adhesive layer can block the welding slag, prevent the welding slag from splashing, and avoid situations such as battery short circuit caused by the splashing of welding slag, improving the reliability of the battery. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the top cover assembly provided by the embodiment of the present application, where the adhesive layer is not shown in the figure;

[0023] Figure 2 It is a schematic structural diagram of the top cover assembly provided by the embodiment of the present application;

[0024] Figure 3 It is a welding schematic diagram of the top cover assembly provided by the embodiment of the present application, where the straight arrow in the figure represents the welding laser beam;

[0025] Figure 4 It is a cross-sectional view of the connecting piece provided by the embodiment of the present application;

[0026] Figure 5 It is a cross-sectional view of the top cover provided by the embodiment of the present application. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0028] Next, in conjunction with Figures 1 to 5 describe the top cover assembly and battery of the present application.

[0029] According to an embodiment of the first aspect of the present application, as Figure 1 , Figure 2 and Figure 3 , the top cover assembly includes a top cover 1, a connecting piece 2 and an adhesive layer 3. The connecting piece 2 is arranged on one side of the top cover 1. The connecting piece 2 and the top cover 1 are connected by welding. The adhesive layer 3 is connected to the side of the connecting piece 2 facing away from the top cover 1 and / or the side of the top cover 1 facing away from the connecting piece 2. The orthographic projection of the adhesive layer 3 at the welding position of the connecting piece 2 and the top cover 1 at least partially coincides with the welding position.

[0030] For the top cover assembly according to the embodiment of the present application, the connecting piece 2 and the top cover 1 are welded together from one side of the adhesive layer 3. During welding, the adhesive layer 3 is melted under the influence of the heated connecting piece 2 and top cover 1, or the welding equipment directly heats the adhesive layer 3 to melt it. Since the orthographic projection of the adhesive layer 3 at the welding position at least partially coincides with the welding position, after the adhesive layer 3 melts, the molten adhesive layer 3 will adhere to the top cover 1 and / or the connecting piece 2 and cover the welding position. The adhesive layer 3 can block the welding slag, prevent the welding slag from splashing, and avoid situations such as battery short circuit caused by the splashing of welding slag, improving the reliability of the battery.

[0031] It can be understood that when the adhesive layer 3 is heated and melted, since the orthographic projection of the adhesive layer 3 at the welding position at least partially coincides with the welding position, the adhesive layer 3 will cover at least part of the welding position to reduce the splashing of welding slag at the welding position.

[0032] It should be noted that the orthographic projection of the adhesive layer 3 on the welding position can completely coincide with the welding position to ensure that the welding position can be completely covered, thus ensuring the effect of preventing the splash of welding slag. When the orthographic projection of the adhesive layer 3 on the welding position partially coincides with the welding position, the adhesive layer 3 can have a certain fluidity, so that the adhesive layer 3 can flow after being heated and melted. At the same time, by setting the thickness and position of the adhesive layer 3, the adhesive layer 3 can completely cover the welding position after melting, ensuring the effect of preventing the splash of welding slag.

[0033] In some examples, the connecting piece 2 and the top cover 1 can be connected by ultrasonic welding, or by laser welding, or by spot welding. It should be noted that the above are only examples of the welding methods between the connecting piece 2 and the top cover 1, and no special limitations are made.

[0034] In some embodiments, when the connecting piece 2 and the top cover 1 are connected by spot welding, the connecting piece 2 and the top cover 1 are welded from the side where the adhesive layer 3 is located, and the spot welding head can pass through the adhesive layer 3 to weld the connecting piece 2 and the top cover 1 together. It should be noted that the spot welding head can first heat the adhesive layer 3 to make the adhesive layer 3 melt, and then the spot welding head can easily pass through the adhesive layer 3. At the same time, the adhesive layer 3 can cover the welding position to prevent the splash of welding slag.

[0035] In some embodiments, the connecting piece 2 and the top cover 1 are connected by laser welding, and the adhesive layer 3 is used for laser transmission.

[0036] It can be understood that when the connecting piece 2 and the top cover 1 are connected by laser welding, the laser will pass through the adhesive layer 3 to weld the connecting piece 2 and the top cover 1 together. During the welding process, the temperatures of the connecting piece 2 and the top cover 1 will rise. Since the adhesive layer 3 is connected to the connecting piece 2 and / or the top cover 1, the adhesive layer 3 will be heated and melted. The molten adhesive layer 3 will adhere to the connecting piece 2 or the top cover 1, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can block the welding slag to prevent the splash of welding slag, and can avoid the occurrence of battery short circuit and other situations caused by the splash of welding slag, improving the reliability of the battery.

[0037] Exemplarily, during specific operations, first, the plastic material that allows laser transmission is melted to make the plastic material have fluidity, which facilitates controlling the injection amount of the plastic material to control the thickness of the adhesive layer 3. Then, the plastic material is injected onto the connecting piece 2 or the top cover 1 so that the plastic material is in a position directly opposite to the welding position. After the plastic material solidifies, the adhesive layer 3 can be formed. Then, a laser machine is used to adjust appropriate parameters to perform laser welding on the welding position. The laser passes through the adhesive layer 3 to weld the top cover assembly and the connecting piece 2. During the welding process, the temperatures of the connecting piece 2 and the top cover 1 will rise. Since the adhesive layer 3 is connected to the connecting piece 2 and / or the top cover 1, the adhesive layer 3 will be heated and melted. The molten adhesive layer 3 will adhere to the connecting piece 2 and / or the top cover 1, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can block the welding slag, prevent the welding slag from splashing, and avoid situations such as battery short circuit caused by the splashing of welding slag, thus improving the reliability of the battery.

[0038] It can be understood that the adhesive layer 3 will melt after being heated. The molten adhesive layer 3 can better contact the connecting piece 2, ensuring the blocking effect on the welding slag. At the same time, the connection stability between the molten adhesive layer 3 and the connecting piece 2 is higher after solidification, which can avoid the situation of the adhesive layer 3 falling off. Moreover, the molten adhesive layer 3 will flow towards the periphery, increasing the coverage area and effectively covering the welding position.

[0039] It can be understood that the adhesive layer 3 has a certain laser transmission ability. The laser beam can pass through the adhesive layer 3 and be focused at the welding position of the connecting piece 2 and the top cover 1. When the laser beam welds the connecting piece 2 and the top cover 1, the connecting piece 2 absorbs the laser energy and quickly heats up. The adhesive layer 3 connected to the connecting piece 2 is heated and melted into a molten state. The molten adhesive layer 3 can form a bond with the connecting piece 2, and the molten adhesive layer 3 can tightly wrap the connecting piece 2 to prevent the welding slag from splashing.

[0040] In some examples, the adhesive layer 3 is, for example, PC plastic, that is, polycarbonate, which makes the adhesive layer 3 have a certain laser transmission ability. The laser beam can pass through the adhesive layer 3 to weld the connecting piece 2 and the top cover 1 together. It should be noted that only an example of the material of the adhesive layer 3 is given here, and there is no special limitation. The adhesive layer 3 can also be any other suitable plastic material that allows laser transmission.

[0041] Exemplarily, the top cover assembly can be applied to a battery. By blocking the splashing of welding slag through the adhesive layer 3, it can prevent the occurrence of battery short circuit caused by welding slag, thus improving the reliability of the battery. It should be noted that only an example of the application scenario of the top cover assembly is given here, and the top cover assembly can also be applied to any other suitable device.

[0042] In some examples, the orthographic projection of the adhesive layer 3 at the welding position is located at the central position of the welding position. It can be understood that by setting the adhesive layer 3 at the position directly opposite the center of the welding position, when the adhesive layer 3 is heated and melted, the adhesive layer 3 will flow towards the periphery and then cover the welding position, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery. It should be noted that at this time, the area of the adhesive layer 3 can be larger than the area of the welding position, thus fully ensuring that the adhesive layer 3 can completely cover the welding position; the area of the adhesive layer 3 can also be smaller than the area of the welding position, as long as the adhesive layer 3 can cover the welding position when it flows towards the periphery after being heated and melted, thereby reducing the usage amount of the adhesive layer 3.

[0043] In some examples, the orthographic projection of the adhesive layer 3 at the welding position coincides with the welding position. It can be understood that it is equivalent to the area of the adhesive layer 3 being the same as the area of the welding position, and the adhesive layer 3 can completely cover the welding position, ensuring that the adhesive layer 3 can prevent the welding slag from splashing. That is, the adhesive layer 3 can wrap the welding position, the adhesive layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery.

[0044] In some examples, at least two connection positions of the connecting piece 2 are connected to the top cover 1 by laser welding. The top cover assembly includes at least two adhesive layers 3, and the at least two adhesive layers 3 correspond to the at least two connection positions one by one. Further, when connecting the connection positions of the connecting piece 2 and the top cover by laser welding, since the adhesive layer 3 is provided at each connection position, the adhesive layer 3 can prevent the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery.

[0045] In an embodiment of the present application, the adhesive layer 3 covers the welding position.

[0046] It can be understood that by covering the welding position with the adhesive layer 3, when connecting the connecting piece 2 and the top cover 1 by laser welding, the welding position will be completely under the adhesive layer 3, so that the adhesive layer 3 can effectively block the welding slag generated by the welding and avoid the splashing of the welding slag. During the welding process, the temperature of the connecting piece 2 will rise, and since the adhesive layer 3 is connected to the connecting piece 2, the adhesive layer 3 will be heated and melted. The molten adhesive layer 3 will adhere to the connecting piece 2. The adhesive layer 3 can wrap the welding position, the adhesive layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery.

[0047] Exemplarily, the adhesive layer 3 covering the welding position can be understood as the welding position being located within the orthographic projection of the adhesive layer 3 at the welding position.

[0048] In one embodiment of the present application, as Figure 1 , Figure 2 and Figure 4 , the connecting piece 2 includes a welding portion 21. The welding portion 21 is concave toward the top cover 1 to form a first groove 22. The welding portion 21 is connected to the top cover 1 by laser welding.

[0049] It can be understood that the welding portion 21 is set as a concave structure, so that the welding portion 21 is concave toward the top cover 1 to form a first groove 22. Since the welding portion 21 of the connecting piece 2 and the top cover 1 are connected by laser welding, an adhesive layer 3 will be provided at the welding position of the welding portion 21 and the top cover 1. That is, the adhesive layer 3 will be provided on the side of the welding portion 21 away from the top cover 1, that is, in the first groove 22. At this time, the first groove 22 can accommodate the adhesive layer 3, and the first groove 22 can limit the melted adhesive layer 3 to prevent the melted adhesive layer 3 from flowing out, ensuring that the adhesive layer 3 always covers the welding position, and the thickness of the adhesive layer 3 remains uniform, ensuring the effect of preventing welding slag from splashing.

[0050] In some examples, in addition to setting the welding portion 21 to be concave toward the top cover 1, a fence can also be provided at the welding portion 21. The fence is arranged around the welding portion 21, and the fence is in sealing contact with the connecting piece 2, so that the fence can enclose the adhesive layer 3 to prevent the adhesive layer 3 from flowing out after being heated and melted, so that the molten adhesive layer 3 will be attached to the connecting piece 2, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can block the welding slag to prevent the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery.

[0051] In one embodiment of the present application, at least a part of the adhesive layer 3 is located in the first groove 22.

[0052] It can be understood that after the adhesive layer 3 is heated and melted, the first groove 22 can be used to accommodate the melted adhesive layer 3 to prevent the adhesive layer 3 from flowing out, so that the adhesive layer 3 can stably cover the welding position of the welding portion 21 and the top cover 1, ensuring the effect of preventing welding slag from splashing. That is, in this embodiment, through the setting of the first groove 22, the molten adhesive layer 3 will be attached to the connecting piece 2, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can block the welding slag to prevent the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery.

[0053] It can be understood that when only the welding portion 21 of the connecting piece 2 is welded to the top cover 1, the adhesive layer 3 can be entirely located in the first groove 22; when there are other positions of the connecting piece 2 welded to the top cover 1 in addition to the welding portion 21, only a part of the adhesive layer 3 is located in the first groove 22.

[0054] In one embodiment of the present application, asFigure 5 The top cover 1 is provided with a second groove 11, and the welding part 21 is arranged in the second groove 11. The welding part 21 is connected to the wall surface of the second groove 11 by laser welding.

[0055] It can be understood that by arranging the welding part 21 at the second groove 11, the second groove 11 can play a limiting role on the welding part 21, improving the connection stability between the connecting piece 2 and the top cover 1. Furthermore, when welding the connecting piece 2 and the top cover 1, relative movement between the connecting piece 2 and the top cover 1 is not likely to occur, facilitating the welding operation and ensuring the forming quality of the top cover assembly.

[0056] Exemplarily, the welding part 21 abuts against the wall surface of the second groove 11, that is, the welding part 21 is clamped in the second groove 11, ensuring the connection stability between the welding part 21 and the top cover 1.

[0057] In an embodiment of the present application, as Figure 4 the connecting piece 2 is provided with a receiving groove 23 for receiving the glue layer 3.

[0058] It can be understood that by arranging the receiving groove 23 at the connecting piece 2, the glue layer 3 is arranged in the receiving groove 23. The receiving groove 23 can play a limiting role on the glue layer 3, enabling the glue layer 3 to be stably located at a position directly opposite to the welding position, preventing the glue layer 3 from shifting and deviating before welding; meanwhile, the receiving groove 23 can also receive the melted glue layer 3, keeping the glue layer 3 in the receiving groove 23 all the time, preventing the melted glue layer 3 from flowing out, and avoiding changes in the thickness of the glue layer 3 opposite to the welding position, ensuring the effect of preventing welding slag from splashing. That is, in this embodiment, through the arrangement of the receiving groove 23, the molten glue layer 3 will be attached to the connecting piece 2, that is, the glue layer 3 can wrap the welding position, and the glue layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and avoiding situations such as battery short - circuit caused by welding slag splashing, improving the reliability of the battery.

[0059] In an embodiment of the present application, the depth of the receiving groove 23 is greater than the thickness of the glue layer 3.

[0060] It can be understood that the depth of the receiving groove 23 is higher than the thickness of the glue layer 3, enabling the glue layer 3 to be completely within the receiving groove 23. The receiving groove 23 can play an effective limiting and receiving role on the glue layer 3, preventing the glue layer 3 from shifting, and ensuring that the glue layer 3 is still in the receiving groove 23 after being heated and melted. The molten glue layer 3 will be attached to the connecting piece 2, that is, the glue layer 3 can wrap the welding position, and the glue layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and avoiding situations such as battery short - circuit caused by welding slag splashing, improving the reliability of the battery.

[0061] In an embodiment of the present application, the thickness of the glue layer 3 is 2 mm - 4 mm.

[0062] It is understandable that setting the thickness of the adhesive layer 3 between 2 mm and 4 mm ensures that the adhesive layer 3 can effectively block the welding slag and prevent the welding slag from splashing effectively.

[0063] Exemplarily, the thickness of the adhesive layer 3 is, for example, 3 mm. It should be noted that the thickness of the adhesive layer 3 can be any other suitable value and is not specifically limited herein.

[0064] According to an embodiment of the second aspect of the present application, the battery includes the above-mentioned top cover assembly.

[0065] According to the battery of the embodiment of the present application, the battery includes a top cover assembly, and the connecting piece 2 of the top cover assembly is located between the adhesive layer 3 and the top cover 1. When laser welding the connecting piece 2 and the top cover 1, the laser will pass through the adhesive layer 3 to weld the connecting piece 2 and the top cover 1 together. During the welding process, the temperature of the connecting piece 2 will rise, and since the adhesive layer 3 is connected to the connecting piece 2, the adhesive layer 3 will be heated and melted. The molten adhesive layer 3 will adhere to the connecting piece 2, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can block the welding slag and prevent the welding slag from splashing, and can avoid situations such as battery short circuit caused by the splashing of welding slag, improving the reliability of the battery.

[0066] During the production process of the battery, when welding the connecting piece 2 and the top cover 1, since the adhesive layer 3 has a certain laser transmission ability, the laser beam can pass through the adhesive layer 3 and be focused at the welding position of the connecting piece 2 and the top cover 1. When the laser beam welds the connecting piece 2 and the top cover 1, the connecting piece 2 absorbs the laser energy and quickly heats up. The adhesive layer 3 connected to the connecting piece 2 is heated and melted into a molten state. The molten adhesive layer 3 can form a bond with the connecting piece 2, and the molten adhesive layer 3 can tightly wrap the connecting piece 2, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can block the welding slag and prevent the welding slag from splashing, and then control the welding slag at the connecting piece, avoiding the welding slag from splashing to other components of the battery such as the battery cell, and can avoid situations such as battery short circuit caused by the splashing of welding slag, improving the reliability of the battery.

[0067] According to an embodiment of the third aspect of the present application, the electrical equipment includes the above-mentioned battery.

[0068] An electrical device according to an embodiment of the present application, the electrical device includes a battery, and the battery includes a top cover assembly. The connecting piece 2 of the top cover assembly is located between the adhesive layer 3 and the top cover 1. When the connecting piece 2 and the top cover 1 are laser welded, the laser will pass through the adhesive layer 3 to weld the connecting piece 2 and the top cover 1 together. During the welding process, the temperature of the connecting piece 2 will rise. Since the adhesive layer 3 is connected to the connecting piece 2, the adhesive layer 3 will be heated and melted. The molten adhesive layer 3 will adhere to the connecting piece 2, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and can avoid the situation of battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery.

[0069] During the production process of the battery, when the connecting piece 2 and the top cover 1 are welded, since the adhesive layer 3 has a certain laser transmission ability, the laser beam can pass through the adhesive layer 3 and be focused at the welding position of the connecting piece 2 and the top cover 1. When the laser beam welds the connecting piece 2 and the top cover 1, the connecting piece 2 absorbs the laser energy and quickly heats up. The adhesive layer 3 connected to the connecting piece 2 is heated and melted into a molten state. The molten adhesive layer 3 can form a bond with the connecting piece 2. The molten adhesive layer 3 can tightly wrap the connecting piece 2, that is, the adhesive layer 3 can wrap the welding position. The adhesive layer 3 can play a role in blocking the welding slag, preventing the welding slag from splashing, and then controlling the welding slag at the connecting piece, avoiding the welding slag from splashing to other components of the battery such as the battery cell, and can avoid the situation of battery short circuit caused by the splashing of the welding slag, improving the reliability of the battery, and further improving the reliability of the electrical device.

[0070] It should be noted that the electrical device can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the electrical device and does not specifically limit the electrical device.

[0071] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A top cover assembly, characterized in that: include: Top cover; A connecting piece, provided on one side of the top cover, wherein the connecting piece and the top cover are connected by welding; An adhesive layer, the adhesive layer is connected to a side of the connecting piece facing away from the top cover and / or a side of the top cover facing away from the connecting piece, and an orthographic projection of the adhesive layer at a welding position between the connecting piece and the top cover at least partially overlaps with the welding position.

2. The top cover assembly according to claim 1, characterized in that: The connecting piece and the top cover are connected by laser welding, and the adhesive layer is used for laser transmission.

3. The top cover assembly according to claim 1, characterized in that: The adhesive layer covers the welding position.

4. The top cover assembly according to claim 1, characterized in that: The connecting piece includes a welding portion, the welding portion is concave toward one side of the top cover to form a first groove, and the welding portion is connected to the top cover by laser welding.

5. The top cover assembly according to claim 4, characterized in that: The glue layer is at least partially located in the first groove.

6. The top cover assembly according to claim 4, characterized in that: The top cover is provided with a second groove, the welding part is provided in the second groove, and the welding part is connected with the wall surface of the second groove by laser welding.

7. The top cover assembly according to any one of claims 1 to 6, characterized in that: The connecting piece is provided with a receiving groove, and the receiving groove is used to receive the adhesive layer.

8. The top cover assembly according to claim 7, characterized in that: The depth of the receiving groove is greater than the thickness of the adhesive layer.

9. The top cover assembly according to any one of claims 1 to 6, characterized in that: The thickness of the adhesive layer is 2mm-4mm.

10. A battery, characterized in that: Comprising a top cover assembly as claimed in any one of claims 1 to 9.

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