Cover plate assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate assembly and a battery, the cover plate assembly is connected with a battery cell, the cover plate assembly comprises a cover plate body, a pole, inner plastic cement and upper plastic cement, the cover plate body is connected with an edge rolling part, the edge rolling part comprises an outer side rolling edge and an inner side rolling edge, the outer side rolling edge is arranged on one side, deviating from the battery cell, of the cover plate body, and the inner side rolling edge is arranged on the other side of the cover plate body. The inner side rolled edge is arranged on one side, facing a battery cell, of the cover plate body; the pole is arranged in the binding part; the inner plastic cement is arranged between the binding part and the post terminal; and the upper plastic cement is connected with the outer side rolled edge, the pole and the inner plastic cement. Therefore, by arranging the outer side rolled edge and the inner side rolled edge, the double-side rolled edge design can be realized, the thinning step is saved, the forming process is simplified, impurities such as metal wires and metal dust are avoided, the short circuit risk is reduced, the positions of the pole and the inner plastic are limited, the pole and the rolled edge parts are in insulated connection, and the safety of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a battery. Background Technology

[0002] Batteries are widely used in daily life, industrial production and modern technology. A battery consists of a cover plate, a casing and a cell. The cover plate is connected to terminals and conductive blocks. The conductive blocks are electrically connected to the cell through the terminals, thereby enabling power supply to external circuits.

[0003] The cover plate is usually connected to the upper plastic through a rolling process. However, in the existing single-sided rolling structure of the cover plate, the unrolled side needs to be thinned two to three times during the molding process. This causes the material to be squeezed from the middle to the outer edge. If the rolling equipment and mold are not stable, metal dust or metal wires may accumulate. In the subsequent cleaning process, these impurities are difficult to remove completely. This may cause impurities such as metal wires to come into contact with the terminal during the cover plate assembly process, and cause problems such as high voltage failure and short circuit, affecting the safety of the battery. Utility Model Content

[0004] The purpose of this invention is to provide a cover plate assembly and a battery to solve the problem of high short-circuit risk in cover plates with single-sided rolled edge structures.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a cover plate assembly connected to a battery cell is provided. The cover plate assembly includes: a cover plate body with a rolled edge portion, the rolled edge portion including an outer rolled edge and an inner rolled edge, the outer rolled edge being disposed on the side of the cover plate body away from the battery cell, and the inner rolled edge being disposed on the side of the cover plate body facing the battery cell; a terminal post disposed inside the rolled edge portion; an inner plastic layer disposed between the rolled edge portion and the terminal post; and an upper plastic layer connected to the outer rolled edge, the terminal post, and the inner plastic layer.

[0007] Preferably, the pole includes a protrusion that is connected to the inner plastic.

[0008] Preferably, the upper plastic includes a first part and a second part that are connected to each other, the first part being disposed between the pole and the inner plastic, and the second part covering the outer edge.

[0009] Preferably, along the thickness direction of the cover plate body, the projection of the outer edge coincides at least partially with the projection of the pole post; and / or, the projection of the inner edge coincides at least partially with the projection of the pole post.

[0010] Preferably, the inner wall of the rolled edge is provided with an anti-twist groove, and the inner plastic is provided with an anti-twist block corresponding to the position of the anti-twist groove.

[0011] Preferably, the depth of the anti-torsion groove is less than or equal to 0.4 mm.

[0012] Preferably, at least two anti-torsion grooves are provided, which are circumferentially spaced on the inner wall of the rolled edge portion, and the anti-torsion grooves are provided in a one-to-one correspondence with the anti-torsion blocks.

[0013] Preferably, the wall thickness of the outer rolled edge is less than or equal to 0.8 mm, and the height of the outer rolled edge is less than or equal to 4.4 mm; and / or, the wall thickness of the inner rolled edge is less than or equal to 0.8 mm, and the height of the inner rolled edge is less than or equal to 3.3 mm.

[0014] Preferably, the cover plate assembly further includes a sealing ring disposed between the pole and the inner rolled edge.

[0015] In a second aspect, a battery includes a cell, a housing, and a cover assembly as described above, wherein the cell is disposed inside the housing, and the cover body is connected to the housing.

[0016] The beneficial effects of this utility model are:

[0017] A cover plate assembly is connected to a battery cell. The cover plate assembly includes a cover plate body, a terminal post, an inner plastic layer, and an upper plastic layer. The cover plate body is connected to a rolled edge portion, which includes an outer rolled edge and an inner rolled edge. The outer rolled edge is located on the side of the cover plate body away from the battery cell, and the inner rolled edge is located on the side of the cover plate body facing the battery cell. The terminal post is located inside the rolled edge portion. The inner plastic layer is located between the rolled edge portion and the terminal post. The upper plastic layer is connected to the outer rolled edge, the terminal post, and the inner plastic layer.

[0018] In this way, both the outer and inner rolled edges are connected to the inner plastic and restrict the position of the inner plastic and the terminal post, preventing the terminal post from loosening. Furthermore, the double rolled edges can save the thinning step, simplify the molding process, and ensure that the material is evenly distributed during the molding process. This avoids the generation of impurities such as metal dust and metal wires during the molding process, reduces the risk of the terminal post coming into contact with impurities and causing a short circuit, and improves the reliability of the cover plate assembly. The outer and inner rolled edges can be stably connected to the terminal post, improving the safety of the battery. Attached Figure Description

[0019] Figure 1 This is a side sectional view of the cover plate assembly in one embodiment of the present utility model;

[0020] Figure 2 This is one embodiment of the present invention. Figure 1 Enlarged view of point A;

[0021] Figure 3 This is a side sectional view of the cover plate body before the edge is rolled in one embodiment of this utility model;

[0022] Figure 4 This is a partial structural schematic diagram of the anti-torsion block in one embodiment of the present invention.

[0023] In the picture:

[0024] 1. Cover plate body; 11. Rolled edge; 111. Outer rolled edge; 112. Inner rolled edge; 113. Anti-torsion groove; 2. Pole post; 21. Protrusion; 3. Inner plastic; 31. Anti-torsion block; 4. Upper plastic; 41. First part; 42. Second part; 5. Lower plastic; 6. Sealing ring. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] See Figure 1 and Figure 2 This utility model provides a cover plate assembly that connects to a battery cell. The cover plate assembly includes a cover plate body 1, a terminal post 2, an inner plastic 3, and an upper plastic 4. The cover plate body 1 is connected to a rolled edge portion 11, which includes an outer rolled edge 111 and an inner rolled edge 112. The outer rolled edge 111 is located on the side of the cover plate body 1 away from the battery cell, and the inner rolled edge 112 is located on the side of the cover plate body 1 facing the battery cell. The terminal post 2 is located inside the rolled edge portion 11. The inner plastic 3 is located between the rolled edge portion 11 and the terminal post 2. The upper plastic 4 is connected to the outer rolled edge 111, the terminal post 2, and the inner plastic 3.

[0030] In this embodiment, the outer rolled edge 111 and the inner rolled edge 112 are integrally formed on the cover plate body 1, so that the outer rolled edge 111 and the inner rolled edge 112 can wrap the side wall of the inner plastic 3. The upper plastic 4 covers the outer rolled edge 111 to achieve an insulated connection between the end of the electrode post 2 away from the battery cell and the cover plate body 1. The cover plate assembly also includes a lower plastic 5, which is fixedly disposed on the cover plate body 1.

[0031] Thus, the outer rolled edge 111 and the inner rolled edge 112 not only enhance the limiting effect of the rolled edge 11 on the terminal post 2 and the inner plastic 3, but also save the thinning step, simplify the molding process, and make the material evenly distributed during the molding process, avoiding the generation of impurities such as metal dust and metal wires. This reduces the risk of the terminal post 2 coming into contact with impurities and causing a short circuit. The inner plastic 3 and the upper plastic 4 can make the terminal post 2 insulated from the outer rolled edge 111, improving the reliability of the cover assembly. Furthermore, the outer rolled edge 111 and the inner rolled edge 112 can enhance the structural strength of the cover body 1, enabling the terminal post 2 to be stably connected to the rolled edge 11, thus improving the safety of the battery.

[0032] It should be noted that, for reference Figure 2 and Figure 3 Before the hemming is formed, the outer hemming 111 and the inner hemming 112 are coaxially arranged circular ring structures. After the hemming is formed, the outer hemming 111 and the inner hemming 112 are both covered with inner plastic 3, and the relative positions of the inner plastic 3 and the pole post 2 connected to the inner plastic 3 on the cover plate body 1 are restricted.

[0033] See Figure 2In some embodiments, the pole post 2 includes a protrusion 21 that is connected to the inner plastic 3.

[0034] In this embodiment, the protrusion 21 is disposed in the middle of the electrode post 2, and the inner plastic 3 is disposed around the outer wall of the protrusion 21. The inner plastic 3 has a groove (not shown in the figure) that mates with the protrusion 21 so that the inner plastic 3 is engaged with the protrusion 21. The side wall of the inner plastic 3 away from the electrode post 2 abuts against the inner wall of the outer rolled edge 111 and the inner wall of the inner rolled edge 112 to limit the relative position of the inner plastic 3 and the rolled edge 11. The end of the electrode post 2 away from the battery cell is engaged with the upper plastic 4.

[0035] Thus, the multi-layer insulation formed by the upper plastic 4 and the inner plastic 3 can enhance the insulation performance between the terminal post 2 and the cover plate body 1, and prevent impurities such as metal dust and metal wires from contacting the terminal post 2, reducing the risk of short circuit. In addition, the terminal post 2 is snapped into the upper plastic 4 and the inner plastic 3, which can improve the connection stability of the terminal post, prevent the terminal post 2 from becoming loose and causing poor contact or short circuit, and improve the safety and reliability of the battery.

[0036] It is understandable that the relative position of the inner plastic 3 and the pole post 2 can be adjusted according to actual design needs. In this embodiment, the inner plastic 3 is connected to the protrusion 21, which can cooperate with the upper plastic 4 to restrict the position of the pole post 2 on the cover plate body 1 and improve the overall stability of the cover plate assembly.

[0037] See Figure 2 In some embodiments, the upper plastic 4 includes a first part 41 and a second part 42 that are connected to each other. The first part 41 is disposed between the pole post 2 and the inner plastic 3, and the second part 42 is disposed covering the outer edge 111.

[0038] In this embodiment, the first part 41 extends along the thickness direction of the cover plate body 1. The surface of the first part 41 facing the second part 42 abuts against the surface of the outer edge 111 facing the pole post 2 and the inner plastic 3 facing the pole post 2. The surface of the first part 41 away from the second part 42 abuts against the side wall of the pole post 2 away from the end of the battery cell. The surface of the first part 41 facing the battery cell abuts against the surface of the protrusion 21 away from the battery cell, so as to achieve insulation protection for the pole post 2.

[0039] Thus, the first part 41 can enhance the insulation performance between the terminal post 2 and the outer rolled edge 111, and restrict the position of the inner plastic 3 within the rolled edge 11. An interlocking structure is formed between the upper plastic 4, the inner plastic 3, and the terminal post 2, which can not only prevent the terminal post 2 from becoming loose and causing poor contact or short circuit, but also ensure a tight connection between the terminal post 2 and the upper plastic 4 and the inner plastic 3. This prevents impurities such as metal wires and metal powder from contacting the terminal post 2 due to gaps, reduces the risk of short circuit in the cover assembly, and improves the safety and reliability of the battery.

[0040] See Figure 2 In some embodiments, along the thickness direction of the cover plate body 1, the projection of the outer edge 111 at least partially coincides with the projection of the pole post 2, and the projection of the inner edge 112 at least partially coincides with the projection of the pole post 2.

[0041] In this embodiment, along the length of the cover plate body 1, the length of the inner rolled edge 112 is greater than the length of the outer rolled edge 111, that is, the inner rolled edge 112 protrudes from the outer rolled edge 111.

[0042] Thus, the outer rolled edge 111 and the inner rolled edge 112 can wrap around the side wall of the terminal post 2, enhance the insulation performance between the terminal post 2 and the cover plate, prevent the terminal post 2 from directly contacting the outside world, reduce the risk of short circuit, and the inner rolled edge 112 can provide stable support for the terminal post 2 and the inner plastic 3, increase the connection stability between the terminal post 2 and the cover plate body 1, and improve the safety and reliability of the battery.

[0043] It is understandable that the lengths of the outer piping 111 and the inner piping 112 can be adjusted according to actual needs, which will not be elaborated here.

[0044] See Figure 3 and Figure 4 In some embodiments, the inner wall of the rolled edge portion 11 is provided with an anti-twist groove 113, and the inner plastic 3 is provided with an anti-twist block 31 at the position corresponding to the anti-twist groove 113.

[0045] In this embodiment, the anti-twist groove 113 is provided along the inner wall of the rolled edge portion 11 and penetrates the outer rolled edge 111. The anti-twist block 31 is integrally formed with the inner plastic 3, so that the rolled edge portion 11 and the inner plastic 3 are engaged by the anti-twist block 31 and the anti-twist groove 113.

[0046] Thus, through the cooperation of the anti-twist groove 113 and the anti-twist block 31, the relative position of the inner plastic 3 and the rolled edge 11 can be restricted, preventing the inner plastic 3 and the terminal post 2 from twisting inside the rolled edge 11, improving the overall structural stability of the cover assembly, and making the connection between the inner plastic 3 and the rolled edge 11 tighter, avoiding the risk of short circuits, poor contact and other problems caused by impurities introduced during the assembly process, and improving the safety of the battery.

[0047] It is understandable that the positions of the anti-twist block 31 and the anti-twist groove 113 can be adjusted according to actual needs, as long as the inner plastic 3 and the rolled edge 11 are stably connected. No further details will be provided here.

[0048] See Figure 3 In some embodiments, the depth of the anti-torsion groove 113 is less than or equal to 0.4 mm. For example, the depth of the anti-torsion groove 113 can be 0.1 mm, 0.2 mm, 0.3 mm, or 0.4 mm.

[0049] Thus, by limiting the depth of the anti-torsion groove 113, the structural strength of the rolled edge portion 11 can be prevented from decreasing due to excessive depth of the anti-torsion groove 113. While the anti-torsion block 31 is stably locked in the anti-torsion groove 113, the rolled edge portion 11 can limit the relative position of the inner plastic 3 and the upper plastic 4, reduce the risk of short circuits or poor contact caused by impurities introduced during assembly, improve the reliability of assembly, and enhance the insulation performance between the rolled edge portion 11 and the pole post 2.

[0050] It is understandable that the depth of the anti-torsion groove 113 can be adjusted according to the specifications and dimensions of the rolled edge 11, so as to limit the relative position of the inner plastic 3 and the rolled edge 11 and prevent the pole post 2 from torturing. Further details are not provided here.

[0051] See Figure 3 and Figure 4 In some embodiments, at least two anti-torsion grooves 113 are provided, which are circumferentially spaced on the inner wall of the rolled edge portion 11, and the anti-torsion grooves 113 correspond one-to-one with the anti-torsion blocks 31. In this embodiment, one rolled edge portion 11 is provided with two anti-torsion grooves 113.

[0052] Thus, by setting at least two anti-torsion grooves 113 and corresponding anti-torsion blocks 31, the anti-torsion performance of the inner plastic 3 can be enhanced, the connection stability between the inner plastic 3 and the rolled edge 11 can be improved, the inner plastic 3 and the rolled edge 11 can be tightly fitted, the sealing and insulation performance at the connection between the terminal post 2 and the rolled edge 11 can be improved, and the relative position of the terminal post 2 on the cover plate body 1 can be limited, so as to prevent impurities such as metal wires from contacting the terminal post 2 and causing a short circuit, thereby improving the stability and reliability of the battery.

[0053] It is understandable that the number of anti-torsion grooves 113 is not limited to two, but can also be three, four, etc., as long as they can limit the position of the inner plastic 3 and the rolled edge 11 and prevent the pole post 2 from torturing. No further examples will be listed here.

[0054] See Figure 3 In some embodiments, the wall thickness of the outer rolled edge 111 is less than or equal to 0.8 mm, the height H1 of the outer rolled edge 111 is less than or equal to 4.4 mm, the wall thickness of the inner rolled edge 112 is less than or equal to 0.8 mm, and the height H2 of the inner rolled edge 112 is less than or equal to 3.3 mm. In this embodiment, the height H1 of the outer rolled edge 111 is greater than the height H2 of the inner rolled edge 112.

[0055] For example, the wall thickness of the outer rolled edge 111 can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc., and the height H1 of the outer rolled edge 111 can be 2mm, 2.5mm, 3mm, 3.4mm, 4mm, 4.4mm, etc., the wall thickness of the inner rolled edge 112 can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc., and the height H2 of the inner rolled edge 112 can be 2mm, 2.5mm, 3mm, 3.3mm, etc.

[0056] It should be noted that the height H1 of the outer hem 111 and the height H2 of the inner hem 112 are both the heights before the hem is formed.

[0057] In this way, the outer rolled edge 111 and the inner rolled edge 112 have sufficient structural strength to limit the position of the inner plastic 3 and the terminal 2. The inner rolled edge 112 is lower in height to avoid occupying too much space on the side of the cover plate body 1 facing the cell, and to avoid assembly interference with other components. In addition, the inner rolled edge 112 can provide stable support for the inner plastic 3 and the terminal 2, and improve the connection stability between the terminal 2 and the cover plate body 1. By setting the outer rolled edge 111 and the inner rolled edge 112, the terminal 2 can be assembled through the rolled edge forming process, saving the thinning step after rolling on one side, improving assembly efficiency, avoiding the generation of impurities such as metal wires, and reducing the risk of short circuit caused by the terminal 2 contacting impurities such as metal wires.

[0058] It is understandable that the wall thickness and height of the outer rolled edge 111 and the wall thickness and height of the inner rolled edge 112 can be adjusted according to actual needs, and will not be listed in detail here.

[0059] See Figure 2 In some embodiments, the cover plate assembly further includes a sealing ring 6 disposed between the pole post 2 and the inner rolled edge 112.

[0060] In this embodiment, the sealing ring 6 is disposed on the side of the protrusion 21 facing the battery cell, and the sealing ring 6 is engaged with the inner rolling edge 112. The surface of the sealing ring 6 facing the battery cell is flush with the surface of the inner rolling edge 112 facing the battery cell.

[0061] Thus, the sealing ring 6 can enhance the sealing performance between the terminal post 2 and the inner rolled edge 112, prevent electrolyte leakage and contact between impurities such as metal wires and the terminal post 2, reduce the risk of short circuit, and improve the connection stability between the terminal post 2 and the inner rolled edge 112, thereby improving the reliability and safety of the cover plate assembly. The sealing ring 6 is not protruding from the inner rolled edge 112, which can effectively utilize the internal space of the rolled edge portion 11, avoid occupying the space of the cover plate body 1 facing the battery cell side and avoid interfering with other components.

[0062] It is understandable that the position of the sealing ring 6 can be adjusted according to actual needs, which will not be elaborated here.

[0063] See Figure 1 The present invention also provides a battery, including a battery cell, a housing and a cover plate assembly, wherein the battery cell is disposed inside the housing and the cover plate body 1 is fixedly connected to the housing.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cover plate assembly, characterized in that, The cover plate assembly, connected to the battery cell, includes: Cover body (1), the cover body (1) is connected with a rolled edge portion (11), the rolled edge portion (11) includes an outer rolled edge (111) and an inner rolled edge (112), the outer rolled edge (111) is disposed on the side of the cover body (1) away from the battery cell, and the inner rolled edge (112) is disposed on the side of the cover body (1) facing the battery cell; The pole post (2) is disposed inside the rolled edge portion (11); Inner plastic (3), the inner plastic (3) is disposed between the rolled edge portion (11) and the pole post (2); The upper plastic (4) is connected to the outer edge (111), the pole (2), and the inner plastic (3).

2. The cover plate assembly according to claim 1, characterized in that, The pole post (2) includes a protrusion (21) which is connected to the inner plastic (3).

3. The cover plate assembly according to claim 1, characterized in that, The upper plastic (4) includes a first part (41) and a second part (42) that are connected to each other. The first part (41) is disposed between the pole post (2) and the inner plastic (3), and the second part (42) is disposed covering the outer edge (111).

4. The cover plate assembly according to claim 1, characterized in that, Along the thickness direction of the cover plate body (1), the projection of the outer edge (111) at least partially coincides with the projection of the pole post (2); and / or, the projection of the inner edge (112) at least partially coincides with the projection of the pole post (2).

5. The cover plate assembly according to claim 1, characterized in that, The inner wall of the rolled edge (11) is provided with an anti-twist groove (113), and the inner plastic (3) is provided with an anti-twist block (31) corresponding to the position of the anti-twist groove (113).

6. The cover plate assembly according to claim 5, characterized in that, The depth of the anti-torsion groove (113) is less than or equal to 0.4 mm.

7. The cover plate assembly according to claim 5, characterized in that, At least two anti-torsion grooves (113) are provided, and the anti-torsion grooves (113) are circumferentially spaced on the inner wall of the rolled edge portion (11). The anti-torsion grooves (113) and the anti-torsion blocks (31) are provided in a one-to-one correspondence.

8. The cover plate assembly according to any one of claims 1-7, characterized in that, The outer rolled edge (111) has a wall thickness of less than or equal to 0.8 mm and a height of less than or equal to 4.4 mm; and / or, the inner rolled edge (112) has a wall thickness of less than or equal to 0.8 mm and a height of less than or equal to 3.3 mm.

9. The cover plate assembly according to any one of claims 1-7, characterized in that, The cover plate assembly also includes a sealing ring (6), which is disposed between the pole post (2) and the inner rolled edge (112).

10. A battery, characterized in that, It includes a battery cell, a housing, and a cover plate assembly as described in any one of claims 1-9, wherein the battery cell is disposed inside the housing, and the cover plate body (1) is connected to the housing.

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