Cover plate assembly, battery and battery pack

Abstract

The utility model provides a cover plate assembly, a battery and a battery pack, and relates to the field of lithium ion batteries. According to the cover plate assembly provided by the invention, the first matching part on the cover plate component is matched with the second matching part on the lower plastic part, so that the cover plate component is directly matched with the lower plastic part; according to the technical scheme, various problems caused by the connection mode that the lower plastic and the cover plate are connected by pressing and riveting the post terminal in the prior art are avoided, and the cover plate component and the lower plastic part can be ensured to be effectively connected even for the cover plate component with large specification and size, so that the conditions that the gap between the cover plate component and the lower plastic part is large and the gap is not uniform are avoided. The first matching part and the second matching part extend along the length direction of the battery, so that one of the first matching part and the second matching part can guide the other one in the assembling process of the first matching part and the second matching part, thereby improving the assembling efficiency and reducing the assembling difficulty.

Description

Technical Field

[0001] The present application relates to the technical field of lithium-ion batteries, and in particular to a cover plate assembly, a battery and a battery pack. Background Art

[0002] In lithium-ion batteries, existing cover plates usually use plastic riveted to the pole, but due to the limited size of the pole, it is not suitable for cover plates with large specifications. In addition, in the assembly method of the plastic riveted to the pole, there are large and uneven assembly gaps, and there is also the risk of stuck ears and foreign objects. As for the lower plastic, the lower plastic is easy to shrink. When the lower plastic is riveted to the pole, the center hole of the lower plastic will be eccentric, too long or too short to adjust. In addition, the height of the lower plastic may be uneven due to the riveting of the lower plastic on the pole, resulting in an imbalance in the fixed pole group. The pole group is therefore prone to movement, causing damage to the pole piece. Utility Model Content

[0003] In view of this, the present application provides a cover assembly, a battery and a battery pack, the purpose of which is to solve the above technical problems to a certain extent.

[0004] In a first aspect, the present application provides a cover plate assembly, the cover plate assembly is used for a battery, the battery has a length direction, and the cover plate assembly includes a cover plate member and a lower plastic part arranged opposite to each other;

[0005] The cover plate component includes a cover plate body and a first matching portion, the first matching portion is arranged on a side of the cover plate body facing the lower plastic part; the lower plastic part includes a lower plastic part body and a second matching portion, the second matching portion is arranged on a side of the lower plastic part facing the cover plate body, and one of the first matching portion and the second matching portion is inserted into the other of the first matching portion and the second matching portion;

[0006] Wherein, the first matching portion and the second matching portion both extend along the length direction.

[0007] Preferably, the second matching portion comprises a convex portion protruding from the lower plastic body;

[0008] The side of the cover plate body facing the lower plastic part is a metal surface, and the first matching portion includes a recessed portion sunken from the metal surface.

[0009] Preferably, the battery also has a width direction, the first matching parts are arranged in pairs, and the two first matching parts in each pair of the first matching parts are respectively close to the two edges of the cover plate body in the width direction, and the second matching parts are arranged in pairs, and the two second matching parts in each pair of the second matching parts are close to the two edges of the lower plastic part body in the width direction.

[0010] Preferably, the first matching portion is inserted into the second matching portion, and a plurality of the second matching portions are arranged at intervals along the length direction;

[0011] Wherein, the lower plastic part body includes block structures whose number is the same as the number of the second matching parts, and each of the block structures is provided with a corresponding second matching part.

[0012] Preferably, the block structure included in the lower plastic part body includes a block structure corresponding to the positive electrode column and a block structure corresponding to the negative electrode column.

[0013] Preferably, at least one end of the second matching portion in the length direction is located at an edge of the corresponding block structure in the length direction.

[0014] Preferably, the first matching portion is inserted into the second matching portion, the second matching portion protrudes from the lower plastic part body, and a protruding height H of the second matching portion relative to the lower plastic part body satisfies 0.4 mm≤H≤0.8 mm;

[0015] And / or, the battery further has a width direction, and a dimension W of the second matching portion in the width direction satisfies 2mm≤W≤5mm.

[0016] Preferably, the battery also has a width direction, the first mating portion is inserted into the second mating portion, the second mating portion protrudes from the lower plastic part body, and the dimension of the side of the second mating portion connected to the lower plastic part body in the width direction is smaller than the dimension of the side of the second mating portion facing away from the lower plastic part body in the width direction.

[0017] In a second aspect, the present application provides a battery, comprising the cover plate assembly as described above.

[0018] In a third aspect, the present application provides a battery pack, comprising a plurality of batteries as described above.

[0019] According to the cover plate assembly provided by the present application, the cover plate assembly and the lower plastic part are directly matched by the first matching portion on the cover plate member and the second matching portion on the lower plastic part matching each other. Therefore, according to the cover plate assembly provided by the embodiment of the present application, various problems caused by the connection method of connecting the lower plastic of the pole by riveting and the cover plate in the prior art are avoided. Even for a cover plate member of large specifications and sizes, it can ensure that the cover plate member and the lower plastic part are effectively connected to avoid the large gap and uneven gap between the cover plate member and the lower plastic part. Both the first matching portion and the second matching portion extend along the length direction of the battery, so that during the assembly process of the first matching portion and the second matching portion, one of the two can guide the other, thereby improving assembly efficiency and reducing assembly difficulty.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram showing an exploded view of a cover plate assembly provided according to an embodiment of the present application;

[0023] Figure 2 A schematic diagram showing another exploded view of a cover plate assembly provided according to an embodiment of the present application;

[0024] Figure 3 A schematic diagram showing a cross-sectional view of a cover plate member of a cover plate assembly provided according to an embodiment of the present application;

[0025] Figure 4 A schematic diagram showing a cross-sectional view of a lower plastic part of a cover plate assembly provided according to an embodiment of the present application is shown;

[0026] Figure 5 A schematic diagram of a cross-sectional view of a cover plate assembly provided according to an embodiment of the present application is shown.

[0027] Reference numerals:

[0028] 10-cover plate assembly; 11-cover plate body; 12-recess;

[0029] 20 - lower plastic part; 21 - main body of lower plastic part; 22 - convex part; 23 - block structure; 30 - length direction; 40 - width direction. DETAILED DESCRIPTION

[0030] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0034] According to a first aspect of an embodiment of the present application, a cover plate assembly is provided. Figures 1 to 5 The structure and working principle of the cover plate assembly are described in detail.

[0035] According to the cover plate assembly provided in the embodiment of the present application, the cover plate assembly is used for a battery, the battery has a length direction 30, and the cover plate assembly includes a cover plate member and a lower plastic part 20 arranged opposite to each other. In the embodiment, the cover plate member includes a cover plate body 11 and a first matching portion, the first matching portion is arranged on the side of the cover plate body 11 facing the lower plastic part 20; the lower plastic part 20 includes a lower plastic part body 21 and a second matching portion, the second matching portion is arranged on the side of the lower plastic part 20 facing the cover plate body 11, and one of the first matching portion and the second matching portion is inserted into the other of the first matching portion and the second matching portion. In the embodiment, the first matching portion and the second matching portion both extend along the length direction 30.

[0036] Thus, according to the cover plate assembly provided in the embodiment of the present application, the cover plate assembly and the lower plastic part 20 are directly matched by the first matching portion on the cover plate member and the second matching portion on the lower plastic part 20 matching each other. Therefore, according to the cover plate assembly provided in the embodiment of the present application, various problems caused by the connection method of connecting the lower plastic of the pole by riveting and the cover plate in the prior art are avoided. Even for the cover plate member of large specifications and sizes, it can ensure that the cover plate member and the lower plastic part 20 are effectively connected to avoid the large gap and uneven gap between the cover plate member and the lower plastic part 20. According to the cover plate assembly provided in the embodiment of the present application, the first matching portion and the second matching portion both extend along the length direction 30 of the battery, so that during the assembly process of the first matching portion and the second matching portion, one of the two can guide the other, thereby improving the assembly efficiency, reducing the assembly difficulty, facilitating disassembly, and not easy to damage.

[0037] Before the application was proposed, due to the limited height of the pole, when the size of the battery is large, the distance between the cover plate member and the lower plastic part 20 is inevitably larger. In this case, the height of the pole may be difficult to ensure the reliability and uniformity of the connection between the cover plate member and the lower plastic part 20. However, the cover plate assembly provided in the embodiment of the application does not use the pole riveting connection method. Even if the lower plastic shrinks, the center hole of the lower plastic will not be eccentric, and the lower plastic and the cover member will not be unevenly fitted. Therefore, the problem of the pole group moving due to the uneven height of the lower plastic will not occur.

[0038] In the embodiment, the first matching portion may be inserted into the second matching portion, or the second matching portion may be inserted into the first matching portion. That is, the first matching portion may be a recessed portion 12 sunken from the cover body 11 of the cover member, and the second matching portion may be a convex portion 22 protruding from the lower plastic body 21 of the lower plastic part 20.

[0039] In an embodiment, when the protrusion 22 and the recess 12 as described above both extend along the length direction 30 of the battery, after a portion of the protrusion 22 is placed into the recess 12, the main body where the protrusion 22 is located (for example, the lower plastic body 21) can be pushed to move along the length direction 30 relative to the main body where the recess 12 is located (correspondingly, for example, the cover body 11), so that the recess 12 guides the protrusion 22 and the protrusion 22 is quickly and completely placed into the recess 12.

[0040] According to the cover assembly provided in the embodiment of the present application, the second mating portion may include a convex portion 22 protruding from the lower plastic part body 21, the side of the cover body 11 facing the lower plastic part 20 is a metal surface, and the first mating portion includes a concave portion 12 recessed from the metal surface.

[0041] In the embodiment, as an example, it has been mentioned in the above description that the second matching portion can be a convex portion 22, thus, as the convex portion 22 formed on the lower plastic part body 21, the second matching portion can be integrally injection molded with the lower plastic part body 21 during the molding process of the lower plastic part 20. In the embodiment, the first matching portion is formed on the metal surface of the cover plate body 11, therefore, the first matching portion as the concave portion 12 can be obtained by a stamping process. Therefore, both the lower plastic part 20 and the cover plate component can be mass-produced by using the current mature process and ensure high dimensional accuracy.

[0042] In an embodiment, the metal surface may be an aluminum surface. As an example, the cover member may include a plain aluminum sheet. The aluminum surface here is a side surface of the plain aluminum sheet, and the recess 12 is formed on the surface, which faces the side where the second mating portion of the lower plastic part 20 is located, that is, the side where the protrusion 22 is located.

[0043] According to the cover assembly provided in the embodiment of the present application, the battery may also have a width direction 40, the first matching parts may be arranged in pairs, and the two first matching parts in each pair of first matching parts may be respectively close to the two edges of the cover body 11 in the width direction 40, and the second matching parts are arranged in pairs, and the two second matching parts in each pair of second matching parts may be close to the two edges of the lower plastic part body 21 in the width direction 40.

[0044] In an embodiment, the first mating portions arranged in pairs and the second mating portions arranged in pairs can further improve the stability of the connection between the lower plastic part 20 and the cover plate component, and the two structures included in the aforementioned paired structures (i.e., the two first mating portions and the two second mating portions as above) are both located on both side edges of their respective main bodies in the battery width direction 40, so as to further ensure the stability of the connection between the lower plastic part 20 and the cover plate component.

[0045] In an embodiment, as an example, a pair of first matching portions as the recessed portion 12 may be provided, for example, and a plurality of pairs of second matching portions as the protruding portion 22 may be provided, and the plurality of pairs of second matching portions are inserted into the aforementioned pair of first matching portions. In other words, for the first matching portion and the plurality of second matching portions on one side in the width direction 40, the size of each of these second matching portions in the length direction 30 is smaller than that of the first matching portion.

[0046] According to the cover assembly provided by the embodiment of the present application, as described above, on one side edge portion in the width direction 40 of the lower plastic part 20, a plurality of second matching parts can be arranged at intervals along the length direction 30. Further, the lower plastic part body 21 can include a number of block structures 23 equal to the number of second matching parts, and each block structure 23 is provided with a corresponding second matching part. In other words, these block structures 23 can be pieced together along the length direction 30. When the second matching parts are arranged at intervals in the length direction 30, the split block structures 23 are conducive to quickly assembling different second matching parts with the corresponding first matching parts.

[0047] In the embodiment, as an example, a pair of second matching parts may be provided on each block structure 23. As described above, two second matching parts in the pair of second matching parts are respectively close to the two side edges of the block structure 23 in the width direction 40 of the battery.

[0048] According to the cover plate assembly provided in the embodiment of the present application, the block structure 23 included in the lower plastic body 21 includes a block structure 23 for corresponding to the positive electrode column and a block structure 23 for corresponding to the negative electrode column. As an example, Figure 1 and Figure 2 As shown, the number of block structures 23 may be two, each having a hole corresponding to the positive electrode column and a hole corresponding to the negative electrode column.

[0049] According to the cover plate assembly provided by the embodiment of the present application, at least one end of the second matching portion in the length direction 30 is located at the edge of the corresponding block structure 23 in the length direction 30. In this way, it is convenient to start with the end located at the edge, first place the end into the first matching portion as the recess 12, and then push the block structure 23 to quickly assemble the block structure 23 to the cover plate assembly 10.

[0050] See also Figure 2 In the embodiment, as an example, the number of the first matching parts and the number of the second matching parts can be the same, that is, each protrusion 22 has a corresponding recess 12 for accommodating the protrusion 22.

[0051] According to the embodiment of the present application, your cover assembly is provided, in which the protruding height H of the second matching portion of the protrusion 22 relative to the lower plastic part body 21 satisfies 0.4mm≤H≤0.8mm; and / or the dimension W of the second matching portion in the width direction 40 satisfies 2mm≤W≤5mm, which will be described in detail below.

[0052] In the embodiment, the convex portion 22 may only meet the range of the protrusion height H as described above, that is, meet 0.4mm≤H≤0.8mm. Specifically, if the protrusion height is too small, for example, less than 0.4mm, on the one hand, the too small size makes it too difficult to manufacture the mold for producing the lower plastic part 20, and on the other hand, since a part of the gap must be reserved for the cooperation between the convex portion 22 and the concave portion 12, if the protrusion height is too small, the part of the convex portion 22 that actually plays a role in the connection will be smaller, thereby adversely affecting the strength of the connection.

[0053] On the other hand, if the height of the protrusion is too large, for example, greater than 0.8 mm, the depth of the corresponding recess 12 must also be increased accordingly, which inevitably leads to an increase in the thickness of the bare aluminum sheet used and an increase in the amount of aluminum used.

[0054] In an embodiment, the height H may be, for example, 0.5 mm, 0.6 mm or 0.7 mm.

[0055] In the embodiment, as an alternative example satisfying the above protrusion height H, according to the cover assembly provided in the embodiment of the present application, the second mating portion may also only satisfy the above dimension W in the width direction 40 satisfying 2mm≤W≤5mm.

[0056] In the embodiment, similar to the above-mentioned height H, when W is too small, that is, less than 2 mm, it will also cause the same mold problem and reduce the strength of the connection. When W is too large, on the one hand, the convex part 22 may occupy too much space on the lower plastic body 21, and on the other hand, it will also increase the width of the adapted concave part 12. In order to ensure the strength of the bare aluminum sheet, the amount of aluminum material used will also increase.

[0057] As an example, W may be 3 mm, 4 mm or 5 mm. Figure 4 As shown, in the embodiment, the width of the protrusion 22 may not be uniform, and W here may be the widest width of the protrusion 22. For example, in the embodiment, the dimension of the side of the protrusion 22 connected to the lower plastic body 21 in the width direction 40 is smaller than the dimension of the side of the protrusion 22 facing away from the lower plastic body 21 in the width direction 40. In other words, Figure 4 In the middle position, the convex portion 22 is wide at the top and narrow at the bottom, so that Figure 5The cooperation with the concave portion 12 (the shape of the concave portion 12 matches the convex portion 22) can further prevent the cover plate component and the lower plastic part 20 from being separated from each other.

[0058] Furthermore, in the embodiment, the convex portion 22 may satisfy both the range of the height H and the range of the width W as described above.

[0059] In the embodiment, the cross section of the convex portion 22 can be formed into a substantial dovetail shape, and the concave portion 12 can be formed into a substantial dovetail groove. However, it is not limited thereto, the convex portion 22 can also be other shapes that meet the above wide at the top and narrow at the bottom, and the structure of the concave portion 12 matches it.

[0060] According to the second aspect of an embodiment of the present application, a battery is provided, the battery includes a cover plate assembly as described above, and may also include a shell, a pole group arranged in the shell, and a pole as described above. In an embodiment, the cover plate assembly is covered on the shell having an opening, and the pole ears extending from the pole group can be connected to the corresponding poles.

[0061] According to a third aspect of an embodiment of the present application, a battery pack is provided. The battery pack includes a plurality of batteries as described above, and may further include a box body, wherein the plurality of batteries as described above are arranged in the box body.

[0062] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly is used for a battery, the battery has a length direction, and the cover plate assembly includes a cover plate member and a lower plastic part arranged opposite to each other; The cover plate component includes a cover plate body and a first matching portion, the first matching portion is arranged on a side of the cover plate body facing the lower plastic part; the lower plastic part includes a lower plastic part body and a second matching portion, the second matching portion is arranged on a side of the lower plastic part facing the cover plate body, and one of the first matching portion and the second matching portion is inserted into the other of the first matching portion and the second matching portion; Wherein, the first matching portion and the second matching portion both extend along the length direction.

2. The cover plate assembly according to claim 1, characterized in that: The second matching portion includes a convex portion protruding from the lower plastic body; The side of the cover plate body facing the lower plastic part is a metal surface, and the first matching portion includes a recessed portion sunken from the metal surface.

3. The cover plate assembly according to claim 1, characterized in that: The battery also has a width direction, the first matching parts are arranged in pairs, and the two first matching parts in each pair of the first matching parts are respectively close to the two edges of the cover plate body in the width direction, and the second matching parts are arranged in pairs, and the two second matching parts in each pair of the second matching parts are close to the two edges of the lower plastic part body in the width direction.

4. The cover plate assembly according to claim 1, characterized in that: The first matching portion is inserted into the second matching portion, and a plurality of the second matching portions are arranged at intervals along the length direction; Wherein, the lower plastic part body includes block structures whose number is the same as the number of the second matching parts, and each of the block structures is provided with a corresponding second matching part.

5. The cover plate assembly according to claim 4, characterized in that: The block structure included in the lower plastic part body includes a block structure corresponding to the positive electrode column and a block structure corresponding to the negative electrode column.

6. The cover plate assembly according to claim 4, characterized in that: At least one end of the second matching portion in the length direction is located at an edge of the corresponding block structure in the length direction.

7. The cover plate assembly according to claim 1, characterized in that: The first matching portion is inserted into the second matching portion, the second matching portion protrudes from the lower plastic part body, and a protruding height H of the second matching portion relative to the lower plastic part body satisfies 0.4 mm ≤ H ≤ 0.8 mm; And / or, the battery further has a width direction, and a dimension W of the second matching portion in the width direction satisfies 2mm≤W≤5mm.

8. The cover plate assembly according to claim 1, characterized in that: The battery also has a width direction, the first matching portion is inserted into the second matching portion, the second matching portion protrudes from the lower plastic part body, and the size of the side of the second matching portion connected to the lower plastic part body in the width direction is smaller than the size of the side of the second matching portion facing away from the lower plastic part body in the width direction.

9. A battery, characterized in that: The battery comprises the cap plate assembly according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack comprises a plurality of batteries as claimed in claim 9.

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