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

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 the outer side face of the cover plate, a first receding opening is formed in the containing groove, a second receding opening is formed in the first plastic part, the first plastic part is embedded in the containing groove, and the second receding opening is aligned with the first receding opening; the second plastic part is attached to the inner side face of the cover plate, the second plastic part is provided with a protruding structure, the protruding structure penetrates through the first receding opening, a tab receding opening is formed in the middle of the protruding structure, and the tab receding opening is aligned with the second receding opening; and the tab avoiding opening and the second avoiding opening are clamped with the clamping groove through the clamping bulge. The outer side face of the cover plate is provided with the containing groove for embedding the first plastic part, the overall thickness is reduced, the space utilization rate is improved, the tab and the pole can be connected in the containing groove through the receding opening, the space utilization rate is further improved, and then the volume energy density of the battery is increased.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically proposes a battery cover assembly and a single cell 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 first avoidance opening is opened in the accommodating groove, a second avoidance opening is opened on the first plastic part, the first plastic part is embedded in the accommodating groove, 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, 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, and the tab avoidance opening is aligned with the second avoidance opening; a snapping protrusion is provided at the position of one of the tab avoidance opening and the second avoidance opening, and the other one is provided with a snapping groove, and the snapping protrusion is snapped into the snapping groove.

[0007] In some embodiments, the snap-fit ​​protrusion is a hot-seal protrusion or a hot-melt protrusion.

[0008] 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.

[0009] In some embodiments, 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 is provided with an explosion-proof valve hole, and an explosion-proof valve plate is sealed on the explosion-proof valve hole.

[0012] In some embodiments, a step structure is provided at the edge of the explosion-proof valve hole, and the step structure abuts against the periphery of the explosion-proof valve plate.

[0013] In some embodiments, a cross-shaped limiter is provided in the middle of the explosion-proof valve hole, and / or the second plastic part is provided with a grid hole, and the grid hole corresponds to the explosion-proof valve hole along the Z direction.

[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 this application, a accommodating groove is provided on the outer side of the cover plate, and the first plastic part is embedded in the accommodating groove, reducing the overall thickness and improving space utilization. In addition, the raised structure of the second plastic part passes through the first avoidance opening of the cover plate. The tab avoidance opening in the middle of the raised structure is used to pass the tab. The tab avoidance opening is aligned with the second avoidance opening, allowing the tab and the pole to connect within the accommodating groove, further improving space utilization and thereby increasing the volumetric energy density of the battery. In addition, the first and second plastic parts are fixedly connected to the slot via a snap-on protrusion, and the cover plate is sandwiched between them, firmly fixed and facilitating 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 ​​slot 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. Explosion-proof valve hole; 114. Explosion-proof valve plate; 115. Step structure; 116. Cross-shaped limiter; 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; 133. Grille hole; M. Snap-fit ​​protrusion; N. Snap-fit ​​slot. 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. The outer side of the cover 110 is provided with a receiving groove 111, and the receiving groove 111 is provided with a first avoidance opening 112. The first plastic part 120 is provided with a second avoidance opening 121. The first plastic part 120 is embedded in the receiving groove 111, and the second avoidance opening 121 is aligned with the first avoidance opening 112. The second plastic part 130 is provided with a second avoidance opening 121. 0 is attached to the inner side of the cover plate 110, and the second plastic part 130 is provided with a protruding structure 131, which passes through the first avoidance opening 112. A tab avoidance opening 132 is opened in the middle of the protruding structure 131, and the tab avoidance opening 132 is aligned with the second avoidance opening 121; a snap-fitting protrusion M is provided at the position of one of the tab avoidance opening 132 and the second avoidance opening 121, and a snap-fitting groove N is provided at the other of the tab avoidance opening 132 and the second avoidance opening 121, and the snap-fitting protrusion M is snap-fitted with the snap-fitting groove N.

[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 to the receiving groove N via the snap-fit ​​protrusion M, and the cover plate 110 is sandwiched between them, firmly fixed and facilitating assembly.

[0035] In some embodiments, reference Figure 2 The snap-fit ​​protrusion M is a hot riveting protrusion or a hot melting protrusion.

[0036] In this embodiment, after the engaging protrusion M is engaged with the engaging slot N, the hot riveting protrusion or the hot melting protrusion can be further fixed to the engaging slot N by heating to enhance the fixing effect.

[0037] 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. In some embodiments, 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.

[0038] 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.

[0039] In some embodiments, reference Figure 1 and Figure 3 The cover plate 110 defines an explosion-proof valve hole 113, which is sealed with an explosion-proof valve disc 114. In some embodiments, a step structure 115 is provided at the edge of the explosion-proof valve hole 113, which abuts against the periphery of the explosion-proof valve disc 114. In some embodiments, a cross-shaped stopper 116 is provided in the middle of the explosion-proof valve hole 113, and / or the second plastic part 130 defines a grille hole 133, which corresponds to the explosion-proof valve hole 113 along the Z direction.

[0040] In the above embodiment, the explosion-proof valve disc 114 abuts against the stepped structure 115, providing a more secure position. Furthermore, the cross-shaped stopper 116 further limits the explosion-proof valve disc 114, preventing it from falling into the battery housing. Furthermore, the grille holes 133 also prevent foreign matter from entering the battery housing. The grille holes 133 correspond to the explosion-proof valve holes 113, providing a venting and explosion-proofing effect at critical moments.

[0041] In a second aspect, the present application proposes a single battery, which includes the battery cover assembly 100 of the first aspect.

[0042] In a third aspect, the present application proposes a battery pack comprising the single cell according to the second aspect.

[0043] 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.

[0044] 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.

[0045] In particular, the term "and / or" in this application should be understood as follows:

[0046] 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.

[0047] 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.

[0048] 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: The cover plate comprises a first plastic part and a second plastic part, wherein a receiving groove is provided on one side of the cover plate, a first avoidance opening is provided in the receiving groove, a second avoidance opening is provided in the first plastic part, the first plastic part is embedded in the receiving groove, 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 opened in the middle of the protruding structure, and the tab avoidance opening is aligned with the second avoidance opening; A clamping protrusion is provided at the position of one of the tab avoidance opening and the second avoidance opening, and a clamping groove is provided at the other one, and the clamping protrusion is clamped with the clamping groove.

2. The battery cover assembly according to claim 1, characterized in that: The clamping protrusion is a hot riveting protrusion or a hot melting protrusion.

3. The battery cover assembly according to claim 1, characterized in that: The first plastic part includes a base plate and a peripheral protrusion that are integrally provided, and the second avoidance opening is formed inside the peripheral protrusion.

4. The battery cover assembly according to claim 3, characterized in that: 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 any one of claims 1 to 5, characterized in that: The cover plate is provided with an explosion-proof valve hole, and an explosion-proof valve sheet is sealed on the explosion-proof valve hole.

7. The battery cover assembly according to claim 6, characterized in that: The edge of the explosion-proof valve hole is provided with a step structure, and the step structure abuts against the periphery of the explosion-proof valve plate.

8. The battery cover assembly according to claim 6, characterized in that: A cross-shaped limiting piece is provided in the middle of the explosion-proof valve hole, and / or the second plastic part is provided with a grid hole, and the grid hole corresponds to the explosion-proof valve hole along the Z direction.

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.

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