Cover plate assembly and battery provided with same

Abstract

The application relates to the technical field of battery manufacturing, and provides a cover plate assembly and a battery provided with the same. The cover plate assembly comprises a cover plate, a lower plastic and a gluing part; the lower plastic is provided with a pole post via hole and a liquid injection channel, and the gluing part is arranged between the cover plate and the lower plastic and located between the pole post via hole and the liquid injection channel, so as to prevent displacement of the lower plastic relative to the cover plate in the riveting process. The cover plate assembly can improve the assembly precision of the cover plate and the lower plastic, and is helpful to improve the yield of the battery product.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a cover plate assembly and a battery having thereon. Background Technology

[0002] A battery typically consists of a cover assembly, a housing, and battery cells housed within the housing. The cover assembly usually comprises terminals, riveting blocks, a cover plate, upper plastic, and lower plastic, and is manufactured primarily through assembly, riveting, and welding processes.

[0003] However, during the riveting of the cover plate, misalignment and warping may occur between the cover plate and the lower plastic, which will affect the assembly accuracy of the cover plate assembly. After the cover plate assembly is assembled on the battery, it will affect the assembly of other battery components, which is not conducive to improving the yield of the assembled battery product. Utility Model Content

[0004] In view of this, this application aims to provide a cover plate assembly to improve the yield rate of battery products.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] A cover assembly includes a cover and a lower plastic layer;

[0007] An adhesive portion is provided between the cover plate and the lower plastic. The lower plastic has an electrode through hole and an injection channel. The adhesive portion is located between the electrode through hole and the injection channel to prevent the lower plastic from shifting relative to the cover plate.

[0008] Furthermore, the lower plastic has an injection groove on the side facing the cover plate, and the adhesive part is disposed in the injection groove.

[0009] Furthermore, the glue injection groove is circular or rectangular.

[0010] Furthermore, the injection groove is rectangular; along the length direction of the lower plastic, the length L1 of the injection groove satisfies: L1≥5mm, and / or, along the width direction of the lower plastic, the width W1 of the injection groove satisfies: W1≥3mm.

[0011] Furthermore, along the height direction of the lower plastic, the depth h of the injection groove satisfies: h ≤ 0.3 mm; and / or, along the height direction of the lower plastic, the projected area S of the injection groove satisfies: 15 ≤ S ≤ 30 mm. 2 .

[0012] Furthermore, the lower plastic is provided with an electrode positioning groove for positioning the electrode base plate, and the electrode positioning groove is connected to the electrode through hole; the injection groove is located between the electrode positioning groove and the injection channel.

[0013] Furthermore, along the length direction of the lower plastic, the distance L2 between the injection groove and the pole positioning groove satisfies: L2≥2mm; and / or, along the length direction of the lower plastic, the distance L3 between the injection groove and the liquid injection channel satisfies: L3≥2mm.

[0014] Furthermore, along the width direction of the lower plastic, the distance W2 between the injection groove and the edge of the lower plastic satisfies: W2≥1mm.

[0015] Furthermore, the adhesive portion is made of acrylic pressure-sensitive adhesive, or the peel strength Q of the adhesive portion satisfies Q≥3.5N / cm.

[0016] Compared with related technologies, this application has the following advantages:

[0017] (1) The cover plate assembly described in this application can improve the connection strength between the cover plate and the lower plastic during assembly by setting the adhesive part. Furthermore, by setting the adhesive part between the electrode through hole and the liquid injection channel, it is convenient to form a constraint point between the electrode through hole and the liquid injection channel, thereby preventing displacement between the lower plastic and the cover plate, ensuring the assembly accuracy between the lower plastic and the cover plate, and improving the yield of battery products.

[0018] (2) By setting the glue injection groove, it is convenient to arrange the adhesive part between the lower plastic and the cover plate, and it helps to reduce the adhesion between the cover plate and the lower plastic, and can constrain the bonding area of ​​the adhesive part, which is conducive to design implementation.

[0019] (3) By making the injection groove round or rectangular, it is easy to process the injection groove on the lower plastic, which reduces the difficulty of processing and production. Moreover, the round or rectangular injection groove is a simple geometric shape, which makes it easy to control the amount and distribution range of the adhesive part.

[0020] (4) By ensuring that the length L1 of the injection groove is greater than or equal to 5mm, the bonding length of the adhesive part in the lower plastic length direction is guaranteed. At the same time, by ensuring that the width W1 of the injection groove is greater than or equal to 3mm, the bonding width of the adhesive part in the lower plastic width direction is guaranteed, which is conducive to design implementation.

[0021] (5) By ensuring that the depth h of the glue injection groove satisfies: h≤0.3mm, the thickness of the adhesive part is guaranteed, avoiding assembly gaps caused by excessive adhesive part thickness, and also helping to reduce the amount of adhesive used and lower costs. At the same time, by ensuring that the projected area S of the glue injection groove satisfies: 15≤S≤30mm 2This ensures the bonding strength of the adhesive parts, helps balance bonding requirements, and facilitates design and implementation.

[0022] (6) The setting of the electrode positioning groove facilitates the positioning of the electrode, and by placing the glue injection groove between the electrode positioning groove and the liquid injection channel, the connection strength at the corresponding position is improved, which facilitates the design and implementation.

[0023] (7) By ensuring that the distance L2 between the glue injection groove and the electrode positioning groove is L2≥2mm, the adhesive part is avoided from affecting the assembly of the electrode and the bonding strength is guaranteed. At the same time, by ensuring that the distance L3 between the glue injection groove and the electrolyte injection groove is L3≥2mm, the adhesive part is avoided from affecting the electrolyte filling and the bonding strength is guaranteed, which is conducive to design implementation.

[0024] (8) By ensuring that the distance W2 between the injection groove and the edge of the lower plastic meets the condition: W2≥1mm, it helps to prevent the adhesive from overflowing from the edge of the lower plastic, which helps to prevent the adhesive from contaminating the outside of the cover plate and other battery components, and facilitates the design and implementation.

[0025] (9) By using acrylic pressure-sensitive adhesive for the adhesive part, it is easier to adapt to the internal environment of the battery and improves the assembly efficiency of the lower plastic and the cover plate. At the same time, by ensuring that the peel strength Q of the adhesive part meets the requirement of Q≥3.5N / cm, the bonding strength of the adhesive part is further guaranteed, which is conducive to design implementation.

[0026] This application also proposes a battery having a cover assembly as described above.

[0027] The battery described in this application has the same beneficial effects as the cover assembly described above compared to the prior art, so it will not be described again here. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the cover plate assembly described in an embodiment of this application;

[0030] Figure 2 This is a cross-sectional schematic diagram of the cover plate assembly described in an embodiment of this application;

[0031] Figure 3 This is a top view of the lower plastic of the cover plate assembly described in this embodiment;

[0032] Figure 4 for Figure 3 Cross-sectional view at point AA;

[0033] Figure 5 for Figure 4 Enlarged view of point A

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Cover plate; 2. Lower plastic part; 3. Adhesive part; 4. Terminal through hole; 5. Liquid injection channel; 6. Glue injection groove; 7. Terminal positioning groove. Detailed Implementation

[0036] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0038] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0040] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0042] An embodiment of the first aspect of this application provides a cover assembly applied in a battery, mainly used to cover the end of the battery to protect the internal structure of the battery. Furthermore, the cover assembly in this embodiment, through its structural innovation, can improve the assembly accuracy of the cover and the lower plastic, which in turn helps to improve the assembly accuracy of other related structures of the cover assembly, thereby improving the yield rate of battery products.

[0043] In related technologies, a battery comprises a casing, inside which are battery cells, and a top cover assembly, which together form a battery product. The cover assembly typically includes terminals, riveting blocks, a cover plate, upper plastic, and lower plastic, and these structures are assembled using processes such as assembly, riveting, and welding to form the cover assembly.

[0044] However, cover plate assemblies are usually assembled by riveting the lower plastic and the cover plate to facilitate the assembly of other structures. During the riveting process, the external force of the riveting may cause the lower plastic and the cover plate to shift. In the longitudinal direction of the cover plate, the area between the terminal through hole and the liquid injection channel, especially the area near the liquid injection channel, may warp, which affects the assembly accuracy of the cover plate assembly. When the cover plate assembly is assembled with other components into a battery product, the assembly accuracy of the cover plate assembly will affect the assembly of other components, thus reducing the yield of the battery product.

[0045] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figures 1 to 5 As shown, the overall design includes a cover plate 1 and a lower plastic 2.

[0046] The cover plate 1 and the lower plastic 2 are provided with an adhesive part 3. The lower plastic 2 has a pole through hole 4 and an injection channel 5. The adhesive part 3 is located between the pole through hole 4 and the injection channel 5 to prevent the lower plastic 2 from shifting relative to the cover plate 1 during the riveting process.

[0047] Therefore, the adhesive part 3 can improve the connection strength when the cover plate 1 and the lower plastic 2 are assembled. By placing the adhesive part 3 between the electrode through hole 4 and the liquid injection channel 5, it is easy to form a constraint point between the electrode through hole 4 and the liquid injection channel 5, which can prevent the lower plastic 2 and the cover plate 1 from shifting, thus ensuring the assembly accuracy of the lower plastic 2 and the cover plate 1 and improving the yield of battery products.

[0048] Based on the above overall introduction, specifically, as an exemplary structural form, it still combines... Figures 1 to 5As shown, the cover assembly in this embodiment generally includes a cover plate 1 and a lower plastic 2.

[0049] In practical implementation, the cover plate 1 can, for example, draw on the structure of the cover plate 1 of an existing battery cover plate assembly (such as a plain aluminum plate), and will not be described in detail here. The shapes of the cover plate 1 and the lower plastic 2 can also draw on the shapes of related structures in existing batteries (such as rectangles), and will not be described in detail here either.

[0050] In addition, the cover plate 1 is usually provided with a through hole that mates with the electrode post through hole 4 of the lower plastic 2 to facilitate the insertion of the electrode post. The cover plate 1 is also provided with an injection hole that communicates with the electrolyte injection channel 5 to facilitate the addition of electrolyte. The specific configuration of the above through holes and injection holes can refer to the specific configuration of the cover plate 1 in existing batteries (such as circular through holes, etc.), and will not be described in detail here.

[0051] In specific implementation, the electrolyte injection channel 5 provided on the upper and lower plastics 2 can be installed by sinking down from the surface of the lower plastic 2 that contacts the cover plate 1. After the cover plate 1 and the lower plastic 2 are assembled, the electrolyte can be injected into the electrolyte injection channel 5 through the injection hole and enter the interior of the battery. The shape of the electrolyte injection channel 5 can be based on the shape of the existing electrolyte injection channel 5 provided on the lower plastic 2, and will not be described in detail here.

[0052] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the adhesive part 3 is still provided between the cover plate 1 and the lower plastic 2. In this embodiment, for example, the lower plastic 2 may be provided with an injection groove 6.

[0053] The above-mentioned injection groove 6 is located on the side of the lower plastic 2 facing the cover plate 1, and the adhesive part 3 is located in the injection groove 6.

[0054] It is understandable that by setting the glue injection groove 6, it is convenient to arrange the adhesive part 3 between the lower plastic 2 and the cover plate 1, and it helps to reduce the adhesion between the cover plate 1 and the lower plastic 2, and can constrain the bonding area of ​​the adhesive part 3, which is conducive to design implementation.

[0055] In specific implementation, the above-mentioned injection groove 6 can be set downward along the thickness direction of the lower plastic 2 from the side of the lower plastic 2 toward the cover plate 1. The adhesive part 3 can be injected into the injection groove 6 before the lower plastic 2 is assembled onto the cover plate 1. During processing, the injection groove 6 can be formed directly on the lower plastic 2 during processing by pre-changing the mold of the lower plastic 2, or it can be formed on the surface of the lower plastic 2 after the lower plastic 2 is made by processing the lower plastic 2 later.

[0056] Continue to combine Figures 1 to 3As shown, in some exemplary embodiments, the example still uses the plastic 2 with a glue injection groove 6. In this embodiment, the glue injection groove 6 may be circular or rectangular.

[0057] It is understandable that by making the injection groove 6 round or rectangular, it is easier to process the injection groove 6 on the lower plastic 2, which reduces the difficulty of processing and production. Moreover, the round or rectangular injection groove 6 is a simple geometric shape, which makes it easy to control the amount and distribution range of the adhesive part 3.

[0058] In specific implementation, in addition to being circular or rectangular, the above-mentioned injection groove 6 can also be other shapes (such as triangles, parallelograms, etc.). Alternatively, the injection groove 6 can also match the projection contour of the lower plastic 2 in the thickness direction, and the edge distance between the injection groove 6 and the projection contour of the lower plastic 2 is set on the surface of the lower plastic 2 facing the cover plate 1.

[0059] Continue to combine Figures 1 to 3 As shown, in some exemplary embodiments, the injection groove 6 is still arranged in a rectangular shape. In this embodiment, for example, the length L1 of the injection groove 6 along the length direction of the lower plastic 2 satisfies: L1≥5mm, and the width W1 of the injection groove 6 along the width direction of the lower plastic 2 satisfies: W1≥3mm.

[0060] It is understandable that by ensuring that the length L1 of the injection groove 6 is greater than or equal to 5mm, the bonding length of the adhesive part 3 in the length direction of the lower plastic 2 is guaranteed. At the same time, by ensuring that the width W1 of the injection groove 6 is greater than or equal to 3mm, the bonding width of the adhesive part 3 in the width direction of the lower plastic 2 is guaranteed, which is beneficial for design implementation.

[0061] In practical implementation, the length L1 of the injection groove 6 refers to the distance between the two sides of the injection groove 6 along the length direction of the lower plastic 2, and the width W1 of the injection groove 6 refers to the distance between the two sides of the injection groove 6 along the width direction of the lower plastic 2.

[0062] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the example of a glue injection groove 6 provided on the lower plastic 2, this embodiment may, for example, make the depth h of the glue injection groove 6 along the height direction of the lower plastic 2 satisfy: h≤0.3mm, and the projected area S of the glue injection groove 6 satisfy: 15≤S≤30mm2.

[0063] Understandably, by ensuring that the depth h of the glue injection groove 6 satisfies h≤0.3mm, the thickness of the adhesive part 3 is guaranteed, avoiding assembly gaps caused by excessive thickness of the adhesive part 3, and helping to reduce the amount of adhesive part 3 used, thus reducing costs. At the same time, by ensuring that the projected area S of the glue injection groove 6 satisfies 15≤S≤30mm2, the bonding strength of the adhesive part 3 is guaranteed, which is conducive to balancing bonding requirements and facilitating design implementation.

[0064] In practical implementation, if the depth of the glue injection groove 6 is uneven, it is only necessary to ensure that the deepest depth h of the glue injection groove 6 meets the requirement of h≤0.3mm.

[0065] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, the lower plastic 2 is provided with a glue injection groove 6 as an example. In this embodiment, for example, the lower plastic 2 may be provided with an pole positioning groove 7.

[0066] The electrode positioning groove 7 is used to position the electrode base plate, and the electrode positioning groove 7 is connected to the electrode through hole 4. The glue injection groove 6 is located between the electrode positioning groove 7 and the liquid injection channel 5.

[0067] It is understandable that the setting of the electrode positioning groove 7 facilitates the positioning of the electrode, and by placing the glue injection groove 6 between the electrode positioning groove 7 and the liquid injection channel 5, the connection strength at the corresponding position is improved, which facilitates the design and implementation.

[0068] In specific implementation, the pole positioning groove 7 can be set according to the shape of the pole base plate. For example, the pole positioning groove 7 can be set on the side of the lower plastic 2 facing away from the cover plate 1, so as to facilitate the positioning and assembly of the pole on the cover plate 1. The projection area of ​​the pole through hole 4 in the thickness direction of the lower plastic 2 is located within the projection area of ​​the pole positioning groove 7 in the thickness direction of the lower plastic 2.

[0069] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the lower plastic 2 with a glue injection groove 6 as an example, this embodiment can, for example, make the distance L2 between the glue injection groove 6 and the pole positioning groove 7 along the length direction of the lower plastic 2 satisfy: L2≥2mm, and the distance L3 between the glue injection groove 6 and the liquid injection channel 5 satisfy: L3≥2mm.

[0070] Understandably, by ensuring that the distance L2 between the glue injection groove 6 and the electrode positioning groove 7 is L2≥2mm, the adhesive part 3 is prevented from affecting the assembly of the electrode and the bonding strength is guaranteed. At the same time, by ensuring that the distance L3 between the glue injection groove 6 and the electrolyte injection channel 5 is L3≥2mm, the adhesive part 3 is prevented from affecting the electrolyte filling and the bonding strength is guaranteed, which is conducive to design implementation.

[0071] In specific implementation, the distance L2 between the glue injection groove 6 and the pole positioning groove 7 refers to the distance between the side of the glue injection groove 6 near the pole positioning groove 7 and the side of the pole positioning groove 7 near the glue injection groove 6 in the length direction of the lower plastic 2. The distance L3 between the glue injection groove 6 and the liquid injection channel 5 refers to the distance between the side of the added groove near the liquid injection channel 5 and the side of the liquid injection channel 5 near the glue injection groove 6 in the length direction of the lower plastic 2.

[0072] Continue to combine Figures 1 to 5As shown, in some exemplary embodiments, taking the example of a glue injection groove 6 on the lower plastic 2, this embodiment can, for example, make the distance W2 between the glue injection groove 6 and the edge of the lower plastic 2 along the width direction of the lower plastic 2 satisfy: W2≥1mm.

[0073] It is understandable that by ensuring that the distance W2 between the injection groove 6 and the edge of the lower plastic 2 satisfies: W2≥1mm, it helps to prevent the adhesive part 3 from overflowing from the edge of the lower plastic 2, which helps to prevent the adhesive part 3 from contaminating the outside of the cover plate 1 and other battery components, and facilitates the design implementation.

[0074] In practical implementation, the distance W2 between the injection groove 6 and the edge of the lower plastic 2 refers to the distance between the side of the injection groove 6 closest to the edge of the lower plastic 2 and the lower plastic 2 in the width direction of the lower plastic 2.

[0075] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, this embodiment may, for example, make the adhesive portion 3 an acrylic pressure-sensitive adhesive, or the peel strength Q of the adhesive portion 3 satisfy Q≥3.5N / cm.

[0076] It is understandable that by using acrylic pressure-sensitive adhesive to make the adhesive part 3, it is easier to adapt to the internal environment of the battery and improves the assembly efficiency of the lower plastic 2 and the cover plate 1. At the same time, by ensuring that the peel strength Q of the adhesive part 3 meets the requirement of Q≥3.5N / cm, the bonding strength of the adhesive part 3 is further guaranteed, which is conducive to design implementation.

[0077] In specific implementation, in addition to acrylic pressure-sensitive adhesive, the adhesive part 3 can also use other adhesives that are suitable for the internal environment of the battery (i.e., resistance to electrolyte corrosion and high temperature resistance, etc.) that can be used in existing batteries (such as Henkel 8020, etc.). The peel strength Q of the adhesive part 3 refers to the force required to separate the cover plate 1 from the lower plastic 2 at a position with a bonding width of 3.5cm.

[0078] It is worth noting that, regarding the cover plate assembly of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 5 As shown, it generally includes a cover plate 1 and a lower plastic 2.

[0079] The lower plastic part 2 has an adhesive part 3 between the cover plate 1 and the lower plastic part 2. The lower plastic part 2 has an electrode through hole 4 and an injection channel 5. The adhesive part 3 is located between the electrode through hole 4 and the injection channel 5. The lower plastic part 2 has an electrode positioning groove 7 on the side facing away from the cover plate 1, and the electrode through hole 4 communicates with the electrode positioning groove 7. The lower plastic part 2 has an injection groove 6 on the side facing the cover plate 1, and the adhesive part 3 is located in the injection groove 6. The injection groove 6 is located between the electrode positioning groove 7 and the injection channel 5.

[0080] The glue injection groove 6 is rectangular in shape. Along the length of the lower plastic 2, the length L1 of the glue injection groove 6 is 5mm. Along the width of the lower plastic 2, the width W1 of the glue injection groove 6 is 3mm. Along the height of the lower plastic 2, the depth h of the glue injection groove 6 is 0.3mm. Along the height of the lower plastic 2, the projected area S of the glue injection groove 6 is 15mm2.

[0081] Along the length of the lower plastic 2, the distance L2 between the injection groove 6 and the electrode positioning groove 7 is 2mm, and the distance L3 between the injection groove 6 and the liquid injection channel 5 is 2mm. Along the width of the lower plastic 2, the distance W2 between the injection groove 6 and the edge of the lower plastic 2 is 1mm. The adhesive part 3 is made of acrylic pressure-sensitive adhesive, and the peel strength Q of the adhesive part 3 is 3.5N / cm.

[0082] In the above preferred embodiments, the specific settings and arrangements of the cover plate 1, the lower plastic 2, the pole positioning groove 7, and the glue injection groove 6 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 1, the lower plastic 2, the pole positioning groove 7, and the glue injection groove 6 can also be referred to the descriptions in the above exemplary embodiments.

[0083] The cover plate assembly of this embodiment adopts the above design. The adhesive part 3 can improve the connection strength when the cover plate 1 and the lower plastic 2 are assembled. By placing the adhesive part 3 between the electrode through hole 4 and the liquid injection channel 5, it is easy to form a constraint point between the electrode through hole 4 and the liquid injection channel 5, which can prevent the lower plastic 2 and the cover plate 1 from shifting, ensure the assembly accuracy of the lower plastic 2 and the cover plate 1, and improve the yield of battery products.

[0084] An embodiment of the second aspect of this application provides a battery having a cover assembly as described above.

[0085] In the battery of this embodiment, the aforementioned cover assembly is located on one side of the battery and is generally mounted on the battery casing. Furthermore, the remaining related structures in this battery can be derived from existing battery structures and will not be described in detail here.

[0086] In this embodiment, the battery, through the cover plate assembly as described above, and the adhesive part 3, can improve the connection strength between the cover plate 1 and the lower plastic 2 during assembly. Furthermore, by placing the adhesive part 3 between the terminal through hole 4 and the liquid injection channel 5, it is convenient to form a constraint point between the terminal through hole 4 and the liquid injection channel 5, preventing displacement between the lower plastic 2 and the cover plate 1, ensuring the assembly accuracy of the lower plastic 2 and the cover plate 1, and improving the yield rate of the battery product.

[0087] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cover plate assembly, characterized in that: Including the cover and the lower plastic; An adhesive portion is provided between the cover plate and the lower plastic. The lower plastic has an electrode through hole and an injection channel. The adhesive portion is located between the electrode through hole and the injection channel to prevent the lower plastic from shifting relative to the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: The lower plastic part has an injection groove on the side facing the cover plate, and the adhesive part is located in the injection groove.

3. The cover plate assembly according to claim 2, characterized in that: The glue injection groove is circular or rectangular.

4. The cover plate assembly according to claim 3, characterized in that: The glue injection groove is rectangular; Along the length direction of the lower plastic, the length L1 of the injection groove satisfies: L1≥5mm, and / or, along the width direction of the lower plastic, the width W1 of the injection groove satisfies: W1≥3mm.

5. The cover plate assembly according to claim 2, characterized in that: Along the height direction of the lower plastic, the depth h of the injection groove satisfies: h ≤ 0.3 mm; and / or, Along the height direction of the lower plastic, the projected area S of the injection groove satisfies: 15 ≤ S ≤ 30 mm. 2 .

6. The cover plate assembly according to claim 2, characterized in that: The lower plastic is provided with an electrode positioning groove for positioning the electrode base plate, and the electrode positioning groove is connected to the electrode through hole; The glue injection groove is located between the pole positioning groove and the liquid injection channel.

7. The cover plate assembly according to claim 6, characterized in that: Along the length of the lower plastic, the distance L2 between the injection groove and the pole positioning groove satisfies: L2 ≥ 2 mm; and / or, Along the length of the lower plastic, the distance L3 between the injection groove and the liquid injection channel satisfies: L3≥2mm.

8. The cover plate assembly according to claim 2, characterized in that: Along the width direction of the lower plastic, the distance W2 between the injection groove and the edge of the lower plastic satisfies: W2≥1mm.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The adhesive part is made of acrylic pressure-sensitive adhesive, or the peel strength Q of the adhesive part satisfies Q≥3.5N / cm.

10. A battery, characterized in that: The battery is provided with a cover plate assembly as described in any one of claims 1 to 9.

Images