Connecting piece, top cover and battery

Abstract

The utility model provides a connecting piece, a top cover and a battery, the connecting piece comprises a body, the body is provided with a welding groove and a glue fixing groove, the welding groove is used for welding the body to a first component, and the welding groove and the glue fixing groove are used for accommodating glue; the adhesive fixing grooves can improve the adhesive capacity of the colloid and prevent the colloid from falling off, so that the blocking effect of the colloid on metal scraps and welding slag is ensured, and the safety performance of the battery is further improved; meanwhile, the welding groove does not penetrate through the connecting piece, so that the risk that glue flows into other parts after hot melting can be reduced, and the influence on the use performance of the battery is prevented; and moreover, the welding groove does not penetrate through the connecting sheet, so that the adhesion area of the colloid can be increased, the adhesion capability of the colloid is further improved, and the risk that the colloid falls off due to poor cohesiveness in a low-temperature use scene is avoided.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a connecting piece, a top cover, and a battery. Background Technology

[0002] In the lithium-ion battery industry, dust and metal shavings are the main factors causing short circuits. During lithium battery assembly, after laser welding of flexible connections, weld slag and metal shavings are easily generated in the welding area. Dust collectors cannot completely remove them, and some will remain in the welding area, posing a risk of metal shavings falling into the cell after cell assembly. Furthermore, after charging and discharging, the welded areas of the flexible connections show signs of oxidation and blackening. Currently, to address this issue, the industry has introduced a dispensing process to coat the laser welding area with adhesive, preventing metal debris and weld slag from spreading into the cell package.

[0003] However, since the current soft connection welding area is a smooth surface, the adhesion of the adhesive particles to it is poor. Furthermore, when lithium-ion batteries are used at low temperatures, the electrolyte will seep into the hot adhesive-covered area because the coefficient of thermal expansion and contraction of the adhesive particles is greater than that of metal. This will cause the adhesive particles to lose their adhesion and risk of falling off. As a result, the adhesive particles lose their ability to block metal debris and welding slag, and there is still a safety risk, resulting in low battery safety. Utility Model Content

[0004] The embodiments of this utility model provide a connecting piece, a top cover, and a battery, which can improve the technical problem of the risk of adhesive particles falling off, thus losing the ability to block metal debris and welding slag.

[0005] In a first aspect, an embodiment of the present invention provides a connecting piece, comprising: a body, wherein the body is provided with a welding groove and a bonding groove, the welding groove being used to weld the body to a first component, and the welding groove and the bonding groove being used to accommodate adhesive.

[0006] In one embodiment, the adhesive groove is disposed on the outside of the welding groove.

[0007] In one embodiment, the depth of the adhesive groove is different from the depth of the welding groove along the thickness direction of the body.

[0008] In one embodiment, the depth of the adhesive groove is less than the depth of the welding groove along the thickness direction of the body.

[0009] In one embodiment, the side of the welding groove facing away from the opening is configured as a convex hull or a flat surface.

[0010] In one embodiment, a gap is provided between the adhesive groove and the welding groove, and the distance between the adhesive groove and the welding groove is 20mm to 30mm.

[0011] In one embodiment, there are multiple adhesive grooves arranged in a ring, and at least two of the adhesive grooves have different depths.

[0012] In one embodiment, along the thickness direction of the connecting piece, the depth of the plurality of adhesive grooves increases sequentially toward the radially outer side of the welding groove.

[0013] In one embodiment, a gap is provided between two adjacent adhesive grooves along the length direction of the connecting piece.

[0014] In one embodiment, the ratio of the area enclosed by the outer ring of the adhesive groove to the projected area of ​​the welding groove is in the range of 2.7:1 to 4.0:1.

[0015] In one embodiment, the bottom wall of the welding groove is uneven; and / or, the bottom wall of the adhesive bonding groove is uneven.

[0016] In one embodiment, the bottom walls of both the welding groove and the adhesive-bonding groove are provided with embossing.

[0017] Secondly, an embodiment of the present invention provides a top cover, including the connecting piece, the first component including a pole post, the pole post being installed on the top cover, the connecting piece being connected to the pole post on the side of the welding groove opposite to the opening, and the colloid being contained in the welding groove and extending into the adhesive groove.

[0018] Thirdly, embodiments of this utility model provide a battery including the top cover.

[0019] The beneficial effects of the embodiments of this utility model are as follows:

[0020] During connection, welding is performed within the area of ​​the welding groove to weld the connecting piece to the first component. A bonding groove is provided on the main body, and adhesive is filled into the area formed by the welding groove and the bonding groove. The bonding groove increases the adhesion of the adhesive, preventing it from falling off and ensuring the adhesive's barrier effect against metal debris and welding slag, further improving battery safety. Simultaneously, since the welding groove does not penetrate the connecting piece, the risk of the adhesive flowing into other components after thermal melting is reduced, preventing any impact on battery performance. Furthermore, the fact that the welding groove does not penetrate the connecting piece increases the adhesive's adhesion area, further enhancing its adhesion and preventing the adhesive from falling off due to decreased adhesion in low-temperature operating environments.

[0021] In embodiments of this utility model, by adding a solid adhesive groove outside the welding area, the adhesiveness of the adhesive can be increased, thereby improving the technical problem that the adhesive is easy to fall off and loses its blocking effect on metal debris and welding slag. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional schematic diagram of a connecting piece provided in Embodiment 1 of this utility model;

[0024] Figure 2 This is a three-dimensional schematic diagram of a connecting piece provided in Embodiment 1 of this utility model from another view.

[0025] Figure 3 This is a three-dimensional schematic diagram of a connecting piece provided in Embodiment 2 of this utility model;

[0026] Figure 4 This is a three-dimensional schematic diagram of a connecting piece provided in Embodiment 3 of this utility model;

[0027] Figure 5 This is a three-dimensional schematic diagram of a connecting piece provided in Embodiment 3 of this utility model.

[0028] Figure Labels

[0029] 1. Body; 11. Welding groove; 12. Adhesive fixing groove; 13. Gap; 14. Rough surface. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0031] Reference Figure 1 and Figure 2 This application provides a connecting piece, including a body 1;

[0032] The body 1 is provided with a welding groove 11 and a glue-fixing groove 12. The welding groove 11 is used to weld the body 1 to the first component, and the glue-fixing groove 12 is used to contain the glue.

[0033] During connection, welding is performed within the area of ​​the welding groove 11 to weld the connecting piece to the first component. A bonding groove 12 is provided on the body 1, and adhesive is filled into the area formed by the welding groove 11 and the bonding groove 12. The bonding groove 12 increases the adhesion of the adhesive, preventing it from falling off and ensuring the adhesive's barrier effect against metal debris and welding slag, further improving battery safety. Simultaneously, since the welding groove 11 does not penetrate the connecting piece, the risk of the adhesive flowing into other components after thermal melting is reduced, preventing impact on battery performance. Furthermore, the fact that the welding groove 11 does not penetrate the connecting piece increases the adhesive's adhesion area, further enhancing its adhesion and preventing the adhesive from falling off due to decreased adhesion in low-temperature operating environments.

[0034] In the embodiments of this utility model, by adding a solid adhesive groove 12 outside the welding area, the adhesiveness of the adhesive can be increased, thereby improving the technical problem that the adhesive is easy to fall off and loses its blocking effect on metal debris and welding slag.

[0035] In some embodiments, refer to Figure 1 and Figure 2 The adhesive groove 12 is disposed on the outside of the welding groove 11.

[0036] Of course, in other embodiments, a protrusion may be provided inside the welding groove 11 to form a glue-fixing groove 12.

[0037] In some embodiments, refer to Figure 1 and Figure 2 Along the thickness direction of the body 1, the depth of the adhesive-solidifying groove 12 is different from the depth of the welding groove 11. Therefore, when the adhesive particles melt and form an adhesive on the welding groove 11 and the adhesive-solidifying groove 12, the difference in depth between the adhesive-solidifying groove 12 and the welding groove 11 creates a stepped shape on the radially outer side of the adhesive. This allows the adhesive to better bond to the connecting piece, improving its adhesion to the connecting piece and preventing the risk of the adhesive falling off when the lithium battery is used at low temperatures. It also ensures that the adhesive can effectively block metal debris and welding slag, thus guaranteeing the safety performance of the lithium battery.

[0038] In some embodiments, refer to Figure 1 and Figure 2 Along the thickness direction of the body 1, the depth of the glue - fixing groove 12 is less than the depth of the welding groove 11. Therefore, after the colloid is filled in the area enclosed by the glue - fixing groove 12, a step - like shape is formed on the outer side in its radial direction, so as to better ensure the attachment of the colloid on the connecting piece, that is, it can better improve the bonding ability of the colloid on the connecting piece, avoid the risk of the colloid falling off when the lithium - battery is used under low - temperature conditions, and ensure that the colloid can block metal debris and welding slag to ensure the safety performance of the lithium - battery.

[0039] In some embodiments, the side of the welding groove away from the opening is provided as a convex bulge or a flat surface.

[0040] It can be understood that in this embodiment, the connecting piece is used for welding with the pole post. When the side of the welding groove 11 away from the opening is provided as a convex bulge, the distance between the pole post and the connecting piece can be shortened to ensure welding; when the side of the welding groove 11 away from the opening is provided as a flat surface, the overall thickness of the body 1 can be reduced to facilitate the transmission of welding energy.

[0041] It should also be noted that referring to Figure 1 and Figure 2 , in this embodiment, the depth of the glue - fixing groove 12 is less than the thickness of the body 1.

[0042] In some embodiments, referring to Figure 3 , a gap 13 is provided between the glue - fixing groove 12 and the welding groove 11. It should also be noted that the height of the plane corresponding to the gap 13 is lower than the height of the upper surface of the body 1; thus, after the glue particles are melted and enter the welding groove 11 and the glue - fixing groove 12, the colloid will also form an attachment area on the surface of the connecting piece between the glue - fixing groove 12 and the welding groove 11. Therefore, the glue particles first sink in the welding groove 11 and towards the bottom of the welding groove 11, then form an attachment area on the surface of the connecting piece between the glue - fixing groove 12 and the welding groove 11, and finally sink in the glue - fixing groove 12 and towards the bottom of the glue - fixing groove 12, that is, the colloid can form a "ji" - shaped (Chinese character "几") on its outer side in the radial direction, and can also form a "clamping" effect of the colloid on the glue - fixing groove 12 and the welding groove 11, thereby better ensuring the bonding ability of the colloid on the connecting piece, avoiding the risk of the colloid falling off when the lithium - battery is used under low - temperature conditions, and ensuring that the colloid can block metal debris and welding slag to ensure the safety performance of the lithium - battery.

[0043] In some embodiments, referring to Figure 3The distance between the adhesive-fixing groove 12 and the welding groove 11 is 20mm to 30mm. In a specific setting, the distance between the adhesive-fixing groove 12 and the welding groove 11 is set to 25mm; of course, in other embodiments, the distance between the adhesive-fixing groove 12 and the welding groove 11 can also be set according to actual needs.

[0044] In some embodiments, refer to Figure 4 The adhesive-fixing grooves 12 are provided in multiple rows, and at least two of the grooves 12 have different depths. The multiple grooves 12 increase the contact area between the adhesive and the connecting piece, and also increase the adhesion of the adhesive to the connecting piece. This ensures the adhesion of the adhesive to the connecting piece, avoids the risk of the adhesive falling off when the lithium battery is used at low temperatures, and ensures that the adhesive can effectively block metal debris and welding slag, thus guaranteeing the safety performance of the lithium battery.

[0045] In some embodiments, refer to Figure 4 Along the thickness direction of the connecting piece, the groove depth of the plurality of adhesive grooves 12 increases sequentially toward the radial outer side of the welding groove 11.

[0046] Of course, in other embodiments, the groove depths of the plurality of adhesive-fixing grooves 12 can be set to be the same, the groove depths of the plurality of adhesive-fixing grooves 12 can be set to be different, the groove depths of the plurality of adhesive-fixing grooves 12 can be successively reduced toward the radial outer side of the welding groove 11, or the depths of the plurality of adhesive-fixing grooves 12 can be arranged in an alternating pattern of deep and shallow grooves. It is only necessary to ensure that the groove depth of the minimum depth meets the usage requirements and does not exceed the overall thickness of the connecting piece.

[0047] In some embodiments, refer to Figure 4, along the length direction of the connecting piece, a gap 13 is provided between two adjacent glue-fixing grooves 12. It should also be noted that the height of the plane corresponding to the gap 13 is lower than the height of the upper surface of the body 1; thus, after the glue particles are melted and enter the welding groove 11 and the glue-fixing groove 12, the glue will also form an attachment area on the surface of the connecting piece between the glue-fixing groove 12 and the welding groove 11 and on the surface of the connecting piece between two adjacent glue-fixing grooves 12. Therefore, the glue particles first sink in the welding groove 11 and towards the bottom of the welding groove 11, form an attachment area on the surface of the connecting piece between the glue-fixing groove 12 and the welding groove 11, sink in the glue-fixing groove 12 and towards the bottom of the glue-fixing groove 12, and form an attachment area on the surface of the connecting piece between two adjacent glue-fixing grooves 12, that is, the glue can form a plurality of "zigzag" edges on its radial outer side, that is, it can form a "clamping" effect of the glue on the glue-fixing groove 12 and the welding groove 11, thereby better ensuring the bonding ability of the glue on the connecting piece, avoiding the risk of the glue falling off when the lithium battery is used under low-temperature conditions, ensuring that the glue can block metal debris and welding slag, so as to ensure the safety performance of the lithium battery.

[0048] In some embodiments, the ratio range of the area enclosed by the outer circle of the glue-fixing groove 12 to the orthographic projection area of the welding groove 11 is 2.7:1 to 4.0:1. That is to say, in specific settings, the area of the glue-fixing groove 12 can be set according to the area of the welding groove 11 to ensure that the glue can block metal debris and welding slag.

[0049] In this embodiment, the radius of the circle where the outer circle of the glue-fixing groove 12 is located is 10 mm, and the radius of the welding groove 11 is 6 mm.

[0050] In some embodiments, referring to Figure 5 , the bottom wall of the welding groove 11 is uneven. Therefore, the roughness between the bottom wall of the welding groove 11 and the glue can be increased, thereby increasing the friction force between the welding groove 11 and the glue, improving the bonding performance of the glue on the welding groove 11, ensuring that the glue can be firmly attached to the connecting piece, avoiding the risk of the glue falling off when the lithium battery is used under low-temperature conditions, ensuring that the glue can block metal debris and welding slag, so as to ensure the safety performance of the lithium battery.

[0051] In some embodiments, the bottom wall of the adhesive groove 12 is uneven. This increases the roughness between the bottom wall of the adhesive groove 12 and the adhesive, thereby increasing the friction between the adhesive groove 12 and the adhesive, improving the adhesion performance of the adhesive on the adhesive groove 12, ensuring that the adhesive can firmly adhere to the connecting piece, avoiding the risk of the adhesive falling off when the lithium battery is used at low temperatures, and ensuring that the adhesive can block metal debris and welding slag, thus guaranteeing the safety performance of the lithium battery.

[0052] In some embodiments, refer to Figure 5 The bottom walls of both the welding groove 11 and the adhesive-fixing groove 12 are uneven. This increases the roughness between the bottom wall of the welding groove 11 and the adhesive, and between the bottom wall of the adhesive-fixing groove 12 and the adhesive, thereby increasing the friction between them. This improves the adhesion of the adhesive to the welding groove 11 and the adhesive-fixing groove 12, ensuring the adhesive adheres firmly to the connecting piece. This avoids the risk of the adhesive falling off when the lithium battery is used at low temperatures, and ensures the adhesive can effectively block metal debris and welding slag, thus guaranteeing the safety performance of the lithium battery.

[0053] In this embodiment, the bottom walls of both the welding groove 11 and the adhesive-fixing groove 12 are provided with embossing 14.

[0054] Secondly, this application also provides a top cover, which includes a connecting piece, the first component includes a pole post, the pole post is mounted on the top cover, the connecting piece is connected to the pole post on the side of the welding groove 11 away from the opening, and the colloid is contained in the welding groove 11 and extends into the adhesive groove 12.

[0055] The unique design of this top cover possesses all the beneficial effects of the aforementioned connecting piece:

[0056] During connection, welding is performed within the area of ​​the welding groove 11 to weld the connecting piece to the first component. A bonding groove 12 is provided on the body 1, and adhesive is filled into the area formed by the welding groove 11 and the bonding groove 12. The bonding groove 12 increases the adhesion of the adhesive, preventing it from falling off and ensuring the adhesive's barrier effect against metal debris and welding slag, further improving battery safety. Simultaneously, since the welding groove 11 does not penetrate the connecting piece, the risk of the adhesive flowing into other components after thermal melting is reduced, preventing any impact on battery performance. Furthermore, the fact that the welding groove 11 does not penetrate the connecting piece also increases the adhesive area, further enhancing its adhesion and preventing the adhesive from falling off due to decreased adhesion in low-temperature operating environments.

[0057] In the embodiments of this utility model, by adding a solid adhesive groove 12 outside the welding area, the adhesiveness of the adhesive can be increased, thereby improving the technical problem that the adhesive is easy to fall off and loses its blocking effect on metal debris and welding slag.

[0058] Thirdly, this application also provides a battery including a top cover.

[0059] This battery's unique design possesses all the beneficial effects of the aforementioned top cover:

[0060] During connection, welding is performed within the area of ​​the welding groove 11 to weld the connecting piece to the first component. A bonding groove 12 is provided on the body 1, and adhesive is filled into the area formed by the welding groove 11 and the bonding groove 12. The bonding groove 12 increases the adhesion of the adhesive, preventing it from falling off and ensuring the adhesive's barrier effect against metal debris and welding slag, further improving battery safety. Simultaneously, since the welding groove 11 does not penetrate the connecting piece, the risk of the adhesive flowing into other components after thermal melting is reduced, preventing any impact on battery performance. Furthermore, the fact that the welding groove 11 does not penetrate the connecting piece also increases the adhesive area, further enhancing its adhesion and preventing the adhesive from falling off due to decreased adhesion in low-temperature operating environments.

[0061] In the embodiments of this utility model, by adding a solid adhesive groove 12 outside the welding area, the adhesiveness of the adhesive can be increased, thereby improving the technical problem that the adhesive is easy to fall off and loses its blocking effect on metal debris and welding slag.

[0062] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A connecting piece, characterized in that, include: The body has a welding groove and a bonding groove. The bonding groove is located outside the welding groove. The welding groove is used to weld the body to a first component. The welding groove and the bonding groove are used to accommodate adhesive. The depth of the bonding groove is different from the depth of the welding groove along the thickness direction of the body.

2. A connecting piece according to claim 1, characterized in that, Along the thickness direction of the body, the depth of the adhesive groove is less than the depth of the welding groove.

3. A connecting piece according to claim 1 or 2, characterized in that, The side of the welding groove facing away from the opening is configured as a convex hull or a flat surface.

4. A connecting piece according to claim 1, characterized in that, A gap is provided between the adhesive-fixing groove and the welding groove, and the distance between the adhesive-fixing groove and the welding groove is 20mm~30mm.

5. A connecting piece according to claim 1, characterized in that, The adhesive-fixing grooves are provided in multiple ways, and the multiple adhesive-fixing grooves are arranged in a ring. At least two of the multiple adhesive-fixing grooves have different groove depths.

6. A connecting piece according to claim 5, characterized in that, Along the thickness direction of the connecting piece, the depth of the plurality of adhesive grooves increases sequentially toward the radially outer side of the welding groove.

7. A connecting piece according to claim 5 or 6, characterized in that, Along the length of the connecting piece, there is a gap between two adjacent adhesive grooves.

8. A connecting piece according to claim 1, characterized in that, The ratio of the area enclosed by the outer ring of the adhesive groove to the projected area of ​​the welding groove is in the range of 2.7:1 to 4.0:

1.

9. A connecting piece according to claim 1, characterized in that, The bottom wall of the welding groove is uneven; and / or the bottom wall of the adhesive-bonding groove is uneven.

10. A connecting piece according to claim 9, characterized in that, The bottom walls of both the welding groove and the adhesive-fixing groove are embossed.

11. A top cover, characterized in that, The first component includes a connecting piece as described in any one of claims 1-10, wherein the first component includes a pole post mounted on the top cover, the connecting piece is connected to the pole post on the side of the welding groove opposite to the opening, and the adhesive is contained in the welding groove and extends into the adhesive-bonding groove.

12. A battery, characterized in that, Includes the top cover as described in claim 11.

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