Cover plate assembly and battery

Abstract

The utility model discloses a cover plate assembly and a battery, the cover plate assembly comprises a metal piece and a plastic piece, the plastic piece is located at one side of the metal piece, one side, facing the plastic piece, of the metal piece is provided with one of a mounting groove and a protruding part, and one side, facing the metal piece, of the plastic piece is provided with the other one of the mounting groove and the protruding part. The size of the mounting groove close to the groove opening is smaller than the size of the groove bottom of the mounting groove, the protruding part is located in the mounting groove, and the metal part and the plastic part are fixedly connected through the protruding part and the mounting groove. The protruding part and the mounting groove form a reversely-buckled embedded structure, connection of the metal part and the plastic part is achieved, the problems that an existing metal part and an existing plastic part are small in binding force and prone to falling off are solved, and the connecting structure has the advantages of being simple in structure, large in binding force and stable in connection.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular to a cover assembly and a battery. Background Art

[0002] The battery cover assembly includes metal parts and plastic parts, which are assembled and connected by clamping, injection molding, ultrasonic welding, etc. The bonding force between the metal parts and the plastic parts is weak, and there is a risk of falling off. Utility Model Content

[0003] The embodiments of the present application provide a cover plate assembly and a battery to solve the problem that existing metal parts and plastic parts have weak bonding force and are easy to fall off.

[0004] In a first aspect, an embodiment of the present application provides a cover plate assembly, comprising:

[0005] Metal parts;

[0006] A plastic part is located on one side of the metal part, the metal part is provided with one of a mounting groove and a protrusion on a side facing the plastic part, and the plastic part is provided with the other of a mounting groove and a protrusion on a side facing the metal part, the size of the mounting groove near the groove opening is smaller than the size of the groove bottom of the mounting groove, the protrusion is located in the mounting groove, and the metal part and the plastic part are fixedly connected through the protrusion and the mounting groove.

[0007] Optionally, a positioning protrusion is provided at the bottom of the installation groove, and a positioning groove cooperating with the positioning protrusion is provided on a side surface of the protrusion that is in contact with the bottom of the groove.

[0008] Optionally, the positioning protrusion is coaxially arranged with the mounting groove.

[0009] Optionally, along the thickness direction, the cross-sectional shape of the mounting groove is trapezoidal.

[0010] Optionally, the side wall of the mounting groove includes a first vertical section, a connecting section, and a second vertical section connected in sequence, the first vertical section is closer to the bottom of the mounting groove than the second vertical section, and the second vertical section is closer to the axis of the mounting groove than the first vertical section.

[0011] Optionally, the metal part is provided with the installation groove, the plastic part is provided with the protrusion, and the metal part around the installation groove is provided with a groove.

[0012] Optionally, the metal part is provided with the mounting groove, the plastic part is provided with the raised portion, a boss is provided on a side of the metal part facing away from the plastic part, and along the thickness direction of the metal part, the projection of the mounting groove is located within the projection of the boss.

[0013] Optionally, the distance between the surface of the boss facing away from the metal part and the surface of the metal part facing away from the plastic part is L2, where 0 < L2 ≤ 0.5 mm.

[0014] Optionally, the metal part is provided with the installation groove, the plastic part is provided with the protrusion, and a counterbore is provided on the side of the metal part facing away from the plastic part. Along the thickness direction of the metal part, the projection of the installation groove is located within the projection of the counterbore.

[0015] In a second aspect, an embodiment of the present application further provides a battery, including a cover plate assembly, a housing, and an electrode assembly. The electrode assembly is installed in the housing, the cover plate assembly is hermetically connected to the housing, and the metal part is located on the side of the plastic part facing away from the electrode assembly.

[0016] The cover plate assembly and the battery provided by the embodiments of the present application. The cover plate assembly includes a metal part and a plastic part. One of the installation groove and the protrusion is provided on the metal part, and the other of the installation groove and the protrusion is provided on the plastic part. The dimension of the installation groove near the groove opening is larger than the dimension of the groove bottom of the installation groove. The protrusion and the installation groove form an inverted buckling fit structure to realize the connection between the metal part and the plastic part, overcoming the problems of small bonding force and easy detachment between the existing metal part and the plastic part, and having the advantages of simple structure, large bonding force, and stable connection. Description of the Drawings

[0017] 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 also be obtained based on these drawings.

[0018] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. Among them, the same reference numerals in the following description represent the same parts.

[0019] Figure 1 It is a three-dimensional view of the cover plate assembly provided by the embodiment of the present application.

[0020] Figure 2 It is a top view of the cover plate assembly provided by the embodiment of the present application.

[0021] Figure 3 It is Figure 2 the sectional view taken along line B-B in

[0022] Figure 4 It is Figure 3 the first form of the partial enlarged view at A in

[0023] Figure 5 for Figure 3 A partial enlarged view of the second form at A in the middle.

[0024] Figure 6 for Figure 3 A partial enlarged view of the third form at A in the middle.

[0025] Figure 7 for Figure 3 A partial enlarged view of the fourth form at A in the middle.

[0026] Figure 8 for Figure 3 A partial enlarged view of the fifth form at A in the middle.

[0027] The figures are:

[0028] 100, cover plate assembly; 110, metal part; 111, mounting groove; 1111, first vertical section; 1112, connecting section; 1113, second vertical section; 112, positioning protrusion; 120, plastic part; 121, raised portion; 122, positioning groove; 130, groove; 140, boss; 150, sink; 160, pole structure; 170, explosion-proof valve. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The present application also provides a cover assembly 100 that can be applied to a square battery. The cover assembly 100 includes a metal part 110 and a plastic part 120. The metal part 110 is located on a side of the plastic part 120 that is away from the electrode assembly. One side of the metal part 110 is bonded to one side of the plastic part 120.

[0031] In the embodiment of the present application, the metal part 110 is a plain aluminum sheet, and the plastic part 120 is a plastic plate. Taking a square battery as an example, the metal part 110 is a rectangular plate structure, and the corresponding plastic part 120 is also a rectangular plate structure. The length dimension of the metal part 110 is the same as the length dimension of the plastic part 120. The width dimension of the metal part 110 is the same as the width dimension of the plastic part 120. The plastic part 120 is used to isolate the metal part 110 and the electrode assembly to improve the safety of the battery.

[0032] In the embodiments of the present application, refer to Figure 3 , on one side of the metal part 110 facing the plastic part 120, there is one of an installation groove 111 and a protrusion 121. The installation groove 111 is a blind hole. The installation groove 111 can be arranged at the end of the metal part 110. Among them, the number of installation grooves 111 at one end of the metal part 110 can be 1 or 2. For example, refer to Figure 2 , along the width direction of the metal part 110, 2 installation grooves 111 are arranged at intervals. The size of the installation groove 111 near the groove opening is smaller than the size of the bottom of the installation groove 111, that is, the installation groove 111 forms a reduced opening structure. On one side of the plastic part 120 facing the metal part 110, there is the other of the installation groove 111 and the protrusion 121, and the shape of the protrusion 121 is adapted to that of the installation groove 111. Correspondingly, the size of one end of the protrusion 121 in contact with the bottom of the installation groove 111 is larger than the size of one end of the protrusion 121 near the groove opening of the installation groove 111. The protrusion 121 is installed in the installation groove 111, and the surface of the protrusion 121 is in contact with the groove wall of the installation groove 111.

[0033] In the embodiments of the present application, after the metal part 110 and the plastic part 120 are press-fitted, the protrusion 121 and the groove wall of the installation groove 111 form an undercut fitting structure. After the metal part 110 and the plastic part 120 are installed, the structures of the protrusion 121 and the installation groove 111 are hidden, and there is no influence on the external structure of the cover plate assembly 100. The structures of the metal part 110 and the plastic part 120 are simple, the installation operation is simple, and they are not easy to fall off, realizing the effective combination of the metal part 110 and the plastic part 120.

[0034] In addition, refer to Figure 1 , the cover plate assembly 100 further includes structures such as an installation hole, a pole column structure 160, an explosion-proof valve 170, etc. The installation hole penetrates through the metal part 110 and the plastic part 120, the pole column structure 160 is fixed in the installation hole, and the explosion-proof valve 170 is arranged in the area between the positive electrode and the negative electrode. The installation groove 111 is installed in the area between the pole column structure 160 and the end of the metal part 110 to prevent the installation groove 111 from affecting the installation of the pole column structure 160. Installation grooves 111 are arranged at both ends of the metal part 110, and the metal part 110 and the plastic part 120 are fixed at both ends of the cover plate assembly 100 to ensure the stable connection of both ends of the plastic part 120 and the metal part 110. In other embodiments, the installation groove 111 can also be arranged in the area between the two pole column structures 160, as long as the installation groove 111 does not interfere with other components. In order to improve the bonding force between the metal part 110 and the plastic part 120, the more fitting structures formed by the installation groove 111 and the protrusion 121, the better.

[0035] In some embodiments, along the thickness direction of the metal part 110, the projected shape of the installation groove 111 is rectangular, circular, elliptical, hexagonal or octagonal. The projection of the installation groove 111 is a regular shape, which is convenient for processing.

[0036] In some embodiments, the plastic part 120 is formed by an injection molding process. The plastic part 120 is directly injection molded on the side of the metal part 110. In another embodiment, the plastic part 120 can be first injection molded by a mold and then assembled with the metal part 110.

[0037] Among them, the plastic part 120 is injection molded on the side of the metal part 110. The filling amount of the plastic material filled in the installation groove 111 is Q, and the volume of the installation groove 111 is V, where 0.7V ≤ Q ≤ V. The filling amount of the plastic material is appropriate to ensure that a protrusion 121 can be formed in the installation groove 111 and an undercut fitting structure is formed with the side wall of the installation groove 111, realizing a firm connection between the metal part 110 and the plastic part 120.

[0038] In some embodiments, referring to Figure 5 , a positioning protrusion 112 is provided at the bottom of the installation groove 111. The size of the positioning protrusion 112 is smaller than the size of the bottom of the groove. The positioning protrusion 112 protrudes towards the opening of the installation groove 111. A positioning groove 122 for cooperating with the positioning protrusion 112 is provided on the side surface of the protrusion 121 that fits with the bottom of the groove. The metal part 110 is fitted and connected with the plastic part 120, and the protrusion 121 is located in the positioning groove 122.

[0039] In the embodiments of the present application, the installation groove 111 is provided on the metal part 110. By providing the positioning protrusion 112 at the bottom of the installation groove 111, when the plastic part 120 is injection molded, it is beneficial to the flow of the injection material filled in the installation groove 111, so that the protrusion 121 fits with the groove wall of the installation groove 111, ensuring the connection strength between the metal part 110 and the plastic part 120.

[0040] In some embodiments, referring to Figure 5 , the positioning protrusion 112 is coaxially arranged with the installation groove 111. The positioning protrusion 112 is in the shape of a frustum of a cone. The size of one end of the positioning protrusion 112 close to the opening of the installation groove 111 is smaller than the size of the opposite end. The coaxial arrangement of the positioning protrusion 112 and the installation groove 111 enables the injection material in the installation groove 111 to flow evenly around. Ensure that the protrusion 121 fits with the groove wall of the installation groove 111, improving the connection effect between the metal part 110 and the plastic part 120.

[0041] In some embodiments, referring to Figure 4 , along the thickness direction, the cross-sectional shape of the installation groove 111 is trapezoidal. For example, the installation groove 111 is provided on the metal part 110, and along the thickness direction of the metal part 110, the cross-sectional shape of the installation groove 111 is an inverted trapezoid. The size of the opening of the installation groove 111 is larger than the size of the bottom of the installation groove 111. The structure of the installation groove 111 is simple, convenient for processing, adapted to the shape of the protrusion 121, and the connection is firm.

[0042] In some embodiments, referring to Figure 6 , the side wall of the installation groove 111 includes a first vertical section 1111, a connecting section 1112, and a second vertical section 1113 that are connected in sequence. The first vertical section 1111 is closer to the bottom of the installation groove 111 than the second vertical section 1113, and the second vertical section 1113 is closer to the axis of the installation groove 111 than the first vertical section 1111. The connecting section 1112 is horizontally arranged. The second vertical section 1113 and the first vertical section 1111 extend along the axis direction of the installation groove 111. The first vertical section 1111 and the second vertical section 1113 are coaxially arranged. The second vertical section 1113 and the connecting section 1112 form a right-angle constriction structure, and the buckling effect between the groove wall of the installation groove 111 and the protrusion 121 is good.

[0043] In some embodiments, referring to Figure 5 , the metal part 110 is provided with an installation groove 111, the plastic part 120 is provided with a protrusion 121, and a groove 130 is provided on the side of the metal part 110 facing the plastic part 120. The groove 130 is arranged along the circumference of the installation groove 111. Along the circumference of the installation groove 111, the groove 130 is a continuous groove. For example, the groove 130 can be an annular groove. As a variation, the groove 130 includes a plurality of sub-grooves, and the plurality of sub-grooves are arranged at intervals along the circumference of the installation groove 111. The plurality of sub-grooves are located on the same circumference. The cross-sectional shape of the groove 130 can be rectangular, trapezoidal, etc.

[0044] In the embodiments of the present application, when the metal part 110 and the plastic part 120 are assembled, by providing the groove 130, when the protrusion 121 enters the installation groove 111, the side wall of the installation groove 111 deforms toward the groove 130 side, and the fourth installation groove 111 provides a deformation space for the deformation of the side wall of the installation groove 111, which is beneficial to the installation of the protrusion 121 into the installation groove 111. Moreover, after the protrusion 121 is installed, the installation groove 111 restores its deformation, and an inverted buckling structure is formed between the side wall of the installation groove 111 and the protrusion 121. It is convenient to assemble the metal part 110 and the plastic part 120, and it is ensured that the bonding force after assembly is relatively large.

[0045] In some embodiments, referring to Figure 5 , the groove 130 is coaxially arranged with the installation groove 111, and the groove 130 is located outside the installation groove 111. The groove depth of the groove 130 is less than the groove depth of the installation groove 111.

[0046] In the embodiments of the present application, the notch size of the installation groove 111 is smaller than the bottom size of the installation groove 111. When the convex portion 121 is installed, the deformation amount of the side wall at the notch of the installation groove 111 is the largest. The groove depth of the groove 130 is set to be smaller than the groove depth of the installation groove 111. While satisfying the maximum deformation of the installation groove 111 when the convex portion 121 is installed, the situation that the groove depth of the groove 130 is too deep and affects the structural strength of the metal part 110 is avoided, and the structural strength of the cover plate assembly 100 is ensured.

[0047] In some embodiments, referring to Figure 7 , an installation groove 111 is provided on the metal part 110, a convex portion 121 is provided on the plastic part 120, and a boss 140 is provided on the side surface of the metal part 110 facing away from the plastic part 120. Along the thickness direction of the metal part 110, the projection of the installation groove 111 is located within the projection of the boss 140.

[0048] In the embodiments of the present application, the installation groove 111 is formed on the metal part 110 by stamping, and the boss 140 is formed on the side surface of the metal part 110 facing away from the plastic part 120. The size of the boss 140 is larger than the projection size of the installation groove 111.

[0049] In some embodiments, referring to Figure 7 , the distance between the surface of the boss 140 facing away from the metal part 110 and the surface of the metal part 110 facing away from the plastic part 120 is L2, and 0 < L2 ≤ 0.5 mm. The value of L2 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or other unlisted values. The maximum size of L2 is 0.5 mm, reducing the probability of the situation that the boss 140 affects battery assembly.

[0050] In some embodiments, referring to Figure 8 , an installation groove 111 is provided on the metal part 110, a convex portion 121 is provided on the plastic part 120, and a counterbore 150 is provided on the side surface of the metal part 110 facing away from the plastic part 120. Along the thickness direction of the metal part 110, the projection of the installation groove 111 is located within the projection of the counterbore 150. When the installation groove 111 is machined on the metal part 110, the boss 140 is formed on the side surface of the metal part 110 facing away from the plastic part 120, and the counterbore 150 is formed by machining the boss 140, avoiding the boss 140 from affecting battery assembly.

[0051] The embodiments of the present application further provide a battery, including the cover plate assembly 100, the housing and the electrode assembly in the above embodiments. The electrode assembly is installed in the housing, the cover plate assembly 100 is hermetically connected to the housing, and the metal part 110 is located on the side of the plastic part 120 facing away from the electrode assembly.

[0052] In this embodiment, referring to Figure 1 , Figure 2 , Figure 3 andFigure 4 In this case, the cover plate assembly 100 includes a metal part 110 and a plastic part 120. The metal part 110 is located on the side of the plastic part 120 away from the electrode assembly, and the metal part 110 is attached to the plastic part 120.

[0053] In the embodiment of the present application, the metal part 110 is a light aluminum sheet, and the plastic part 120 is a plastic plate. Taking a square battery as an example, both the metal part 110 and the plastic part 120 are rectangular plate structures. The plastic part 120 is used to isolate the metal part 110 and the electrode assembly, improving the safety of the battery.

[0054] In the embodiment of the present application, an installation groove 111 is provided on the side of the metal part 110 facing the plastic part 120. The installation groove 111 is a blind hole. The number of installation grooves 111 at one end of the metal part 110 can be 1 or 2. The size of the installation groove 111 near the groove opening is smaller than the size of the bottom of the installation groove 111, that is, the installation groove 111 has a reduced opening structure. A protrusion 121 is provided on the side of the plastic part 120 facing the metal part 110, and the shape of the protrusion 121 is adapted to that of the installation groove 111. The protrusion 121 is installed in the installation groove 111, and the surface of the protrusion 121 is in contact with the groove wall of the installation groove 111.

[0055] In the embodiment of the present application, after the metal part 110 and the plastic part 120 are pressed together, an inverted buckle fitting structure is formed between the protrusion 121 and the groove wall of the installation groove 111. After the metal part 110 and the plastic part 120 are installed, the structures of the protrusion 121 and the installation groove 111 are hidden, and there is no impact on the external structure of the cover plate assembly 100. The structures of the metal part 110 and the plastic part 120 are simple, the installation operation is simple, and they are not easily detached, realizing the effective combination of the metal part 110 and the plastic part 120.

[0056] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0057] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0058] The above has introduced the cover plate assembly and the battery provided by 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 cover plate assembly (100), characterized in that: include: Metal part (110); The plastic part (120) is located on one side of the metal part (110); the metal part (110) is provided with one of a mounting groove (111) and a protruding portion (121) on one side facing the plastic part (120); the plastic part (120) is provided with the other of a mounting groove (111) and a protruding portion (121) on one side facing the metal part (110); the size of the mounting groove (111) near the groove opening is smaller than the size of the groove bottom of the mounting groove (111); the protruding portion (121) is located in the mounting groove (111); and the metal part (110) and the plastic part (120) are fixedly connected via the protruding portion (121) and the mounting groove (111).

2. The cover plate assembly (100) according to claim 1, characterized in that: The groove bottom of the installation groove (111) is provided with a positioning protrusion (112), and a side surface of the protrusion (121) that is in contact with the groove bottom is provided with a positioning groove (122) that cooperates with the positioning protrusion (112).

3. The cover plate assembly (100) according to claim 2, characterized in that: The positioning protrusion (112) is coaxially arranged with the mounting groove (111).

4. The cover plate assembly (100) according to claim 1, characterized in that: Along the thickness direction, the cross-sectional shape of the mounting groove (111) is a trapezoid.

5. The cover plate assembly (100) according to claim 1, characterized in that: The side wall of the mounting groove (111) comprises a first vertical section (1111), a connecting section (1112) and a second vertical section (1113) which are connected in sequence, the first vertical section (1111) being closer to the bottom of the mounting groove (111) than the second vertical section (1113), and the second vertical section (1113) being closer to the axis of the mounting groove (111) than the first vertical section (1111).

6. The cover plate assembly (100) according to any one of claims 2 to 5, characterized in that: The metal part (110) is provided with the installation groove (111), the plastic part (120) is provided with the protrusion (121), and the metal part (110) around the installation groove (111) is provided with a groove (130).

7. The cover plate assembly (100) according to any one of claims 2 to 5, characterized in that: The metal part (110) is provided with the mounting groove (111), the plastic part (120) is provided with the protruding portion (121), a boss (140) is provided on a side of the metal part (110) facing away from the plastic part (120), and along the thickness direction of the metal part (110), the projection of the mounting groove (111) is located within the projection of the boss (140).

8. The cover plate assembly (100) according to claim 7, characterized in that: The distance between the surface of the boss (140) facing away from the metal part (110) and the surface of the metal part (110) facing away from the plastic part (120) is L2, 0<L2≤0.5mm.

9. The cover plate assembly (100) according to any one of claims 2 to 5, characterized in that: The metal part (110) is provided with the mounting groove (111), the plastic part (120) is provided with the protruding portion (121), a sink (150) is provided on a side of the metal part (110) facing away from the plastic part (120), and along the thickness direction of the metal part (110), the projection of the mounting groove (111) is located within the projection of the sink (150).

10. A battery, characterized in that: It comprises a cover plate assembly (100) as claimed in any one of claims 1 to 9, a shell and an electrode assembly, wherein the electrode assembly is installed in the shell, the cover plate assembly (100) is sealed to the shell, and the metal part (110) is located on a side of the plastic part (120) facing away from the electrode assembly.

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