Battery cover plate assembly and single battery and battery pack comprising same

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By opening a storage groove on the outer side of the cover plate and embedding the first plastic part, and connecting the clamped hull with the clamped hole is solved, the problems of low space utilization and unstable fixation caused by the square battery cover plate structure are solved, and a higher volume energy density and stable connection are achieved.

CN223273384UActive Publication Date: 2025-08-26SVOLT ENERGY TECHNOLOGY CO LTD

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Patent Information

Application Number: CN202422706303.7
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-11-06
Publication Date: 2025-08-26
Estimated Expiration: 2034-11-06

AI Technical Summary

Technical Problem

The cover plate structure of existing square batteries leads to low space utilization, affecting the volume energy density of the battery, and is not fixed firmly enough.

Method used

A battery cover assembly is designed, by opening a storage groove on the outer side of the cover plate, embedding the first plastic part, and using the connection between the clamping hull and the clamping hole, combining the pole ear avoidance port and multiple sets of avoidance port structures to improve space utilization and enhance the fixing effect.

Benefits of technology

The overall thickness of the cover plate is reduced, the space utilization is improved, the volume energy density of the battery is increased, and a firm fixed connection is achieved through the clamping structure.

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Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery cover plate assembly as well as a single battery and a battery pack comprising the battery cover plate assembly. The battery cover plate assembly comprises a cover plate, a first plastic part and a second plastic part, a containing groove is formed in one side face of the cover plate, a through hole is formed in the containing groove, the first plastic part is embedded in the containing groove, one of the first plastic part and the second plastic part is provided with a clamping convex hull, the other one of the first plastic part and the second plastic part is provided with a clamping hole, and the clamping convex hull penetrates through the through hole to be clamped with the clamping hole. According to the invention, the outer side surface of the cover plate is provided with the accommodating groove, the first plastic part is embedded in the accommodating groove, the overall thickness is reduced, the space utilization rate is improved, the second plastic part and the first plastic part penetrate through the through hole of the cover plate through the clamping convex hull to be fixedly connected with the clamping hole, and the cover plate is clamped between the second plastic part and the first plastic part, so that the fixing is firm, and the assembly is convenient.

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Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically proposes a battery cover assembly and a single battery and a battery pack comprising the same. Background Art

[0002] In related technologies, square batteries generally refer to batteries with square steel or aluminum shells. They have high energy density and long cycle life, and therefore have been widely used in many fields.

[0003] Specifically, the cover plate is a crucial component in prismatic batteries. It seals the opening of the battery casing and protects the battery's internal winding core. Furthermore, the cover plate is insulated with upper and lower plastic layers, respectively, to prevent short circuits and battery failure.

[0004] However, the upper plastic layer is located on the outside of the cover plate, and the lower plastic layer is located on the inside of the cover plate, and both have a certain thickness. This makes the upper plastic layer, the cover plate and the lower plastic layer occupy a large space in the thickness direction, which is not conducive to improving the volume energy density of the battery. Utility Model Content

[0005] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0006] In the first aspect, the present application proposes a battery cover assembly, which includes a cover, a first plastic part and a second plastic part. A accommodating groove is provided on one side of the cover, a through hole is opened in the accommodating groove, the first plastic part is embedded in the accommodating groove, one of the first plastic part and the second plastic part is provided with a snap-fitting bulge, and the other one is provided with a snap-fitting hole, and the snap-fitting bulge passes through the through hole and is snap-fitted to the snap-fitting hole.

[0007] In some embodiments, the accommodating groove is provided with a first avoidance opening, the first plastic part is provided with a second avoidance opening, and the second avoidance opening is aligned with the first avoidance opening; the second plastic part is attached to the other side of the cover plate, and the second plastic part is provided with a protruding structure, the protruding structure passes through the first avoidance opening, and a tab avoidance opening is provided in the middle of the protruding structure, and the tab avoidance opening is aligned with the second avoidance opening.

[0008] In some embodiments, the snap-fit bump is a hot-riveted bump or a hot-melt bump.

[0009] In some embodiments, the first plastic part includes an integrally arranged base plate and a peripheral protrusion, and a second avoidance opening is formed inside the peripheral protrusion; along the Z direction, the top surface of the base plate is not higher than the outer side surface of the cover plate, and the top surface of the peripheral protrusion is not lower than the outer side surface of the cover plate.

[0010] In some embodiments, the maximum thickness of the cover plate is H, the distance between the top surface of the base plate and the outer side surface of the cover plate is T, and 0≤T≤0.5H.

[0011] In some embodiments, the cover plate includes a positive electrode area and a negative electrode area, and the positive electrode area and the negative electrode area are respectively provided with a receiving groove, and each receiving groove has at least two first avoidance openings; the first plastic part has two and is respectively embedded in the two receiving grooves, and each first plastic part has at least two second avoidance openings, and the second avoidance openings are arranged one-to-one corresponding to the first avoidance openings.

[0012] In some embodiments, the second plastic part is integrally formed and has a first area and a second area. The first area and the second area are respectively provided with at least two tab avoidance openings, and the tab avoidance openings and the second avoidance openings are provided in one-to-one correspondence.

[0013] In some embodiments, at least two through holes are provided between two adjacent first avoidance openings, at least two snap-fit holes are provided between two adjacent second avoidance openings, and at least two snap-fit convex bumps are provided between two adjacent tab avoidance openings.

[0014] In a second aspect, the present application provides a single battery, which includes the battery cover assembly of the first aspect.

[0015] In a third aspect, the present application proposes a battery pack comprising the single cell according to the second aspect.

[0016] The technical solution proposed in this application has at least the following technical effects:

[0017] In the present application, a receiving groove is provided on the outer side of the cover plate, and the first plastic part is embedded in the receiving groove to reduce the overall thickness and improve space utilization. Moreover, the second plastic part and the first plastic part are fixedly connected through the through hole and the snap-fit hole of the cover plate through the snap-fit convex bump, and the cover plate is clamped in the middle, which is firmly fixed and convenient for assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to better integrate the contents shown in the drawings with the contents described in the specific embodiments, a brief introduction to the drawings is given below. It is understood that the drawings mentioned below are only schematic illustrations of the relevant technical solutions and some embodiments of the technical solutions of this application. Without making any creative efforts, those skilled in the art can also create drawings showing other embodiments.

[0019] Specifically, the annotations to the drawings of the specification are as follows:

[0020] Figure 1 This is an exploded schematic diagram of a battery cover assembly according to some embodiments of the present application;

[0021] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0022] Figure 3 for Figure 1 A magnified schematic diagram of point B in the middle;

[0023] Figure 4 This is a schematic structural diagram of the first plastic part described in some embodiments of this application;

[0024] Figure 5 This is a schematic diagram of the connection between the snap-fit protrusion and the snap-fit hole described in some embodiments of the present application.

[0025] Specifically, the annotations of the accompanying drawings are as follows:

[0026] 100. Battery cover assembly; 110. Cover; 111. Accommodation groove; 112. First avoidance opening; 113. Through hole; 120. First plastic part; 121. Second avoidance opening; 122. Base plate; 123. Edge protrusion; 130. Second plastic part; 131. Protrusion structure; 132. Tab avoidance opening; M. Snap-fit convex bump; N. Snap-fit hole. DETAILED DESCRIPTION

[0027] To make the contents of the embodiments of this application clearer, the following description will be made in conjunction with the accompanying drawings. It is understood that the contents mentioned below are only some of the embodiments of this application, and all embodiments are listed in detail. Therefore, without inventive work, other embodiments obtained based on the following embodiments fall within the scope of protection of this application.

[0028] It should be understood that the terms used herein are for the purpose of describing specific embodiments only and are not intended to strictly limit the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not exclude the possibility that the feature may be plural in other embodiments.

[0029] It should be understood that the terms "include," "comprising," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of additional features in the embodiment. Similarly, when terms such as first, second, etc. are used herein to describe multiple features, they are merely used to distinguish one feature from another and do not imply a sequence or order unless the context clearly indicates otherwise.

[0030] It should be understood that, unless the context clearly indicates otherwise, the terms "disposed," "connected," and "installed" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; they may be directly connected or indirectly connected through a medium. Those skilled in the art will understand the specific meanings of these terms in the context of the text based on the specific circumstances.

[0031] In addition, for the convenience of description, the text will use terms of spatial relative relationships to illustrate the position of one feature relative to another feature, such as "inside", "outside", "end", "side", "upper", "middle", "lower", "high", "lower", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations in addition to those shown in the drawings of the specification.

[0032] The embodiments of the present application are described below with reference to the accompanying drawings.

[0033] First, refer to Figures 1 to 5 The present application proposes a battery cover assembly 100, which includes a cover 110, a first plastic part 120 and a second plastic part 130. A side surface of the cover 110 is provided with a receiving groove 111, and a through hole 113 is opened in the receiving groove 111. The first plastic part 120 is embedded in the receiving groove 111. One of the first plastic part 120 and the second plastic part 130 is provided with a snap-fitting convex bump M, and the other one is provided with a snap-fitting hole N. The snap-fitting convex bump M passes through the through hole 113 and is snap-fitted with the snap-fitting hole N. In some embodiments, the accommodating groove 111 defines a first avoidance opening 112, and the first plastic part 120 defines a second avoidance opening 121, which is aligned with the first avoidance opening 112. The second plastic part 130 is attached to the other side of the cover plate 110 and has a protrusion 131. The protrusion 131 passes through the first avoidance opening 112, and a tab avoidance opening 132 is defined in the middle of the protrusion 131, which is aligned with the second avoidance opening 121. In some embodiments, the snap-fit protrusion M is a hot-riveted protrusion or a hot-melt protrusion.

[0034] In this application, the cover plate 110 has a receiving groove 111 on its outer side, and the first plastic part 120 is embedded in the receiving groove 111, reducing the overall thickness and improving space utilization. In addition, the raised structure 131 of the second plastic part 130 passes through the first avoidance opening 112 of the cover plate 110. The tab avoidance opening 132 in the middle of the raised structure 131 is used to pass the tab. The tab avoidance opening 132 is aligned with the second avoidance opening 121, allowing the tab and the pole to connect within the receiving groove 111, further improving space utilization and thereby increasing the volumetric energy density of the battery. In addition, the first plastic part 120 and the second plastic part 130 are fixedly connected by the snap-fitting protrusion M and the snap-fitting hole N, and the cover plate 110 is sandwiched between them, firmly fixed and facilitating assembly.

[0035] In this embodiment, after the snap-fitting convex bump M is snap-fitted to the snap-fitting hole N, the hot-riveting convex bump or the hot-melt convex bump and the snap-fitting hole N can be further fixed by heating to enhance the fixing effect.

[0036] In some embodiments, reference Figure 4 and Figure 5 The first plastic component 120 includes an integral base plate 122 and a peripheral protrusion 123. The peripheral protrusion 123 defines a second escape opening 121. Along the Z direction, the top surface of the base plate 122 is no higher than the outer side of the cover plate 110, and the top surface of the peripheral protrusion 123 is no lower than the outer side of the cover plate 110. In some embodiments, the maximum thickness of the cover plate 110 is H, and the distance between the top surface of the base plate 122 and the outer side of the cover plate 110 is T, with 0 ≤ T ≤ 0.5H.

[0037] In the above embodiment, the base plate 122 is lower than the outer side of the cover plate 110, and the distance between the base plate 122 and the cover plate 110 should be moderate. If it is too large, the receiving groove 111 is too deep, affecting the strength of the cover plate 110; if it is too small, the space utilization rate will be reduced. For example, T can be 0.5H. In addition, the edge protrusion 123 is higher than the outer side of the cover plate 110, which facilitates insulation.

[0038] In some embodiments, reference Figure 1 The cover plate 110 includes a positive electrode region and a negative electrode region, each of which is provided with a receiving groove 111, and each receiving groove 111 is provided with at least two first avoidance openings 112; the first plastic part 120 has two first avoidance openings 121, each of which is respectively embedded in the two receiving grooves 111, and each of the first plastic part 120 is provided with at least two second avoidance openings 121, and the second avoidance openings 121 are provided in a one-to-one correspondence with the first avoidance openings 112. In some embodiments, the second plastic part 130 is integrally formed, and the second plastic part 130 has a first region and a second region, and the first region and the second region are respectively provided with at least two tab avoidance openings 132, and the tab avoidance openings 132 are provided in a one-to-one correspondence with the second avoidance openings 121. In some embodiments, at least two through holes 113 are provided between two adjacent first avoidance openings 112, at least two snap-fit holes N are provided between two adjacent second avoidance openings 121, and at least two snap-fit convex bumps M are provided between two adjacent tab avoidance openings 132.

[0039] In the above embodiment, the structure of multiple sets of avoidance openings facilitates the tabs to pass through from multiple positions, thereby reducing the thickness of the tab at a single location and facilitating the connection of the folded tabs to the poles. In addition, the multiple sets of snap-fit protrusions M connected to the snap-fit holes N help to increase the firmness of the connection.

[0040] In a second aspect, the present application proposes a single battery, which includes the battery cover assembly 100 of the first aspect.

[0041] In a third aspect, the present application proposes a battery pack comprising the single cell according to the second aspect.

[0042] In the above embodiments, the single cell of the second aspect and the battery pack of the third aspect both include the battery cover assembly 100 of the first aspect. Therefore, the single cell of the second aspect and the battery pack of the third aspect have at least all the technical effects of the battery cover assembly 100 of the first aspect, and their specific technical effects will not be repeated here.

[0043] The embodiments of the present application only illustrate the structures of the single cell of the second aspect and the battery pack of the third aspect that are related to the improvement points of the present application, but it does not mean that they do not have other structures. For example, the single cell also includes a battery shell covered by the battery cover assembly 100, and / or the battery pack also includes a battery frame that encapsulates multiple single cells, etc. Other structures will not be described one by one here.

[0044] In particular, the term "and / or" in this application should be understood as follows:

[0045] In the first case, the term “and / or” located between a first subject and a second subject includes any one of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and the second subject.

[0046] In the second case, the term "and / or" between the last two entities in three or more entities means including at least any one of the entities. For example, "the first entity, the second entity and / or the third entity" has the same meaning as "the first entity and / or the second entity and / or the third entity", specifically including the following combinations: (1) only the first entity; (2) only the second entity; (3) only the third entity; (4) the first entity and the second entity without the third entity; (5) the first entity and the third entity without the second entity; (6) the second entity and the third entity without the first entity; and (7) the first entity, the second entity, and the third entity.

[0047] In addition, although the above content describes the embodiments of the present application in conjunction with the accompanying drawings, those skilled in the art can also make various modifications and variations without departing from the concept of the present application, and such modifications and variations will fall within the scope of protection of the present application.

Claims

1. A battery cover assembly, characterized in that: It includes a cover plate, a first plastic part and a second plastic part. A accommodating groove is provided on one side of the cover plate, a through hole is opened in the accommodating groove, the first plastic part is embedded in the accommodating groove, one of the first plastic part and the second plastic part is provided with a snap-fitting convex bump, and the other one is provided with a snap-fitting hole. The snap-fitting convex bump passes through the through hole and is snap-fitted with the snap-fitting hole.

2. The battery cover assembly according to claim 1, characterized in that: The accommodating groove is provided with a first avoidance opening, the first plastic part is provided with a second avoidance opening, and the second avoidance opening is aligned with the first avoidance opening; The second plastic part is attached to the other side of the cover plate. The second plastic part is provided with a protruding structure. The protruding structure passes through the first avoidance opening. A tab avoidance opening is opened in the middle of the protruding structure. The tab avoidance opening is aligned with the second avoidance opening.

3. The battery cover assembly according to claim 1, characterized in that: The snap-fit convex bump is a hot-riveted convex bump or a hot-melt convex bump.

4. The battery cover assembly according to claim 2, characterized in that: The first plastic part includes a base plate and a surrounding protrusion that are integrally provided, and the second avoidance opening is formed in the surrounding protrusion; Along the Z direction, the top surface of the base plate is not higher than the outer side surface of the cover plate, and the top surface of the peripheral protrusion is not lower than the outer side surface of the cover plate.

5. The battery cover assembly according to claim 4, characterized in that: The maximum thickness of the cover plate is H, and the distance between the top surface of the base plate and the outer side surface of the cover plate is T, where 0≤T≤0.5H.

6. The battery cover assembly according to claim 4, characterized in that: The cover plate includes a positive electrode area and a negative electrode area, each of which is provided with a receiving groove, and each of the receiving grooves is provided with at least two first avoidance openings; The first plastic parts have two and are respectively embedded in the two accommodating grooves. Each of the first plastic parts is provided with at least two second avoidance openings, and the second avoidance openings are arranged in a one-to-one correspondence with the first avoidance openings.

7. The battery cover assembly according to claim 6, characterized in that: The second plastic part is integrally formed and has a first area and a second area. The first area and the second area are respectively provided with at least two tab avoidance openings, and the tab avoidance openings are arranged in a one-to-one correspondence with the second avoidance openings.

8. The battery cover assembly according to claim 7, characterized in that: At least two through holes are provided between two adjacent first avoidance openings, at least two clamping holes are provided between two adjacent second avoidance openings, and at least two clamping convex bumps are provided between two adjacent tab avoidance openings.

9. A single cell battery, characterized in that: A battery cover assembly comprising the battery cover assembly according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The invention comprises the single cell battery according to claim 9.