Battery case

Abstract

The utility model provides a battery shell and relates to the technical field of batteries. The battery shell comprises a shell body and a cover plate assembly, the cover plate assembly is arranged on the shell body and comprises a combined plastic part and a connecting piece, the combined plastic part is of a flat plate structure, the lower end face of the combined plastic part is connected to the shell body, and the connecting piece is connected to the upper end face of the combined plastic part in an injection molding mode. According to the battery shell, the occupied space of the top cover assembly can be reduced, and the space utilization rate in the shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell. Background Art

[0002] Existing batteries generally consist of a top cover assembly, a housing, and a stage group that work together. Specifically, the stage group is installed within the housing, and the top cover assembly is positioned over the open end of the housing to enclose the stage group within the housing. The stage group is provided with a terminal lug. Typically, due to the high coverage of the second plastic part in the top cover assembly and the placement of structures such as the connecting tab below the top cover assembly, once the top cover assembly is positioned over the open end of the housing, the lower structure of the top cover assembly occupies a significant amount of space within the housing, resulting in low space utilization within the housing. Utility Model Content

[0003] The purpose of the utility model is to provide a battery housing, which can reduce the space occupied by the top cover assembly and improve the space utilization inside the housing.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] The battery shell includes a shell and a cover assembly, wherein the cover assembly is arranged on the shell, and the cover assembly includes a composite plastic part and a connecting piece. The composite plastic part is arranged as a flat plate structure, and the lower end surface of the composite plastic part is connected to the shell, and the connecting piece is connected to the upper end surface of the composite plastic part.

[0006] As a further technical solution, a connecting groove is provided on the upper end surface of the combined plastic part, and the connecting piece is injection-molded and connected to the connecting groove.

[0007] As a further technical solution, at least one limiting member is provided on the upper end surface of the combined plastic part, the first end of the limiting member is fixedly provided on one side of the connecting groove, the second end extends in a direction close to the center line of the connecting groove, and the second end of the limiting member abuts against the upper end surface of the connecting plate.

[0008] As a further technical solution, the combined plastic part includes a first plastic part and a second plastic part, the second plastic part is configured as a flat plate, the first plastic part is integrally formed and arranged on the upper end surface of the second plastic part, and the connecting piece is injection-molded and connected to the upper end surface of the first plastic part.

[0009] As a further technical solution, the combined plastic part includes a first plastic part and a second plastic part, the second plastic part is configured as a flat plate, the first plastic part is movably arranged on the upper end surface of the second plastic part, and the connecting piece is injection-molded and connected to the upper end surface of the first plastic part.

[0010] As a further technical solution, a connecting skirt is provided on the outer peripheral wall of the first plastic part. The connecting skirt extends in a ring shape along the circumference of the first plastic part. The width of the connecting skirt is set to 1 mm to 10 mm.

[0011] As a further technical solution, the assembled plastic part is provided with a tab through-hole corresponding to the connecting piece, which allows the tab to pass through.

[0012] As a further technical solution, the cover plate assembly further includes an explosion-proof valve. Two of the connecting pieces are spaced apart on the combined plastic part. The explosion-proof valve is arranged on the combined plastic part and located between the two connecting pieces.

[0013] As a further technical solution, the combined plastic part is further provided with a liquid injection port connected to the shell, and the liquid injection port is provided between the explosion-proof valve and one of the connecting pieces.

[0014] As a further technical solution, L=-1H~0.5H, wherein L is the distance between the upper end surface of the second plastic part in the combined plastic part and the upper end surface of the shell top plate, and H is the thickness of the top plate.

[0015] Compared with the existing technology, the battery housing provided by the present invention has the following technical advantages:

[0016] 1. Since the assembled plastic part is set as a flat structure, when the lower end surface of the assembled plastic part is directly connected to the shell, the occupation of the internal space of the shell by the assembled plastic part can be reduced, thereby improving the internal space utilization of the shell.

[0017] 2. Because the connecting piece is injection-molded to the upper end face of the assembly, when the assembly is connected to the housing, the connecting piece is outside the housing. This reduces the space occupied by the connecting piece within the housing, further improving the internal space utilization of the housing. Furthermore, because the connecting piece is injection-molded to the upper end face of the assembly, the connection between the two is improved in terms of connection convenience, connection strength, and connection stability. This also further reduces the gap between the connecting piece and the assembly, thereby reducing the volume of the cover assembly and achieving the technical effect of reducing the space occupied by the cover assembly within the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0019] Figure 1This is an exploded view of a battery housing provided by an embodiment of the present utility model;

[0020] Figure 2 This is a schematic structural diagram of a battery housing provided by an embodiment of the present utility model;

[0021] Figure 3 is a cross-sectional view of a battery housing provided by an embodiment of the present utility model;

[0022] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0023] In the picture:

[0024] 100, housing;

[0025] 200, cover plate assembly; 210, combined plastic part; 201, connecting groove; 202, limiter; 211, first plastic part; 212, second plastic part; 2111, connecting skirt; 213, tab through hole; 220, connecting piece; 230, explosion-proof valve; 240, liquid injection port. DETAILED DESCRIPTION

[0026] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0027] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0028] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0029] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0030] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0031] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0032] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0033] Combine Figures 1 to 4As shown, the battery housing provided in this embodiment can reduce the space occupied by the top cover assembly and improve the space utilization inside the housing 100. Specifically, the battery housing (hereinafter referred to as the battery housing) includes a housing 100 and a cover assembly 200. The cover assembly 200 is disposed on the housing 100. The cover assembly 200 includes a composite plastic part 210 and a connecting piece 220. The composite plastic part 210 is configured as a flat plate structure, and the lower end surface of the composite plastic part 210 is connected to the housing 100, and the connecting piece 220 is connected to the upper end surface of the composite plastic part 210.

[0034] Since the assembled plastic part 210 is configured as a flat plate structure, when the lower end surface of the assembled plastic part 210 is directly connected to the housing 100 , the internal space occupied by the assembled plastic part 210 can be reduced, thereby improving the internal space utilization of the housing 100 .

[0035] Because the connecting piece 220 is injection-molded and connected to the upper end surface of the assembly molded part 210, when the assembly molded part 210 is connected to the housing 100, the connecting piece 220 is outside the housing 100, thereby reducing the space occupied by the connecting piece 220 within the housing 100, further improving the internal space utilization of the housing 100. In addition, because the connecting piece 220 is injection-molded and connected to the upper end surface of the assembly molded part 210, the connection convenience, connection strength, and connection stability between the two are improved, while further reducing the gap between the connecting piece 220 and the assembly molded part 210, thereby reducing the spatial volume of the cover assembly 200, thereby achieving the technical effect of reducing the space occupied by the cover assembly 200 within the housing 100.

[0036] Preferably, a connecting groove 201 is provided on the upper end surface of the assembled plastic part 210, and a connecting piece 220 is injection-molded and connected to the connecting groove 201. The cross-sectional area of ​​the connecting groove 201 is larger than the cross-sectional area of ​​the connecting piece 220, and the connecting groove 201 is recessed in the upper end surface of the assembled plastic part 210. When the connecting piece 220 is injection-molded and connected to the connecting groove 201, not only is the connection strength and stability between the connecting piece 220 and the assembled plastic part 210 improved, but the overall thickness of the cover assembly 200 can also be minimized, thereby further reducing the internal space occupied by the cover assembly 200 within the housing 100.

[0037] Furthermore, at least one limiting member 202 is provided on the upper end surface of the combined plastic part 210, the first end of the limiting member 202 is fixedly provided on one side of the connecting groove 201, the second end extends in a direction close to the center line of the connecting groove 201, and the second end of the limiting member 202 abuts against the upper end surface of the connecting piece 220.

[0038] Specifically, in this embodiment, two limiting members 202 are provided. Both limiting members 202 are fixedly disposed at the open end of the connecting groove 201 , and the two limiting members 202 are disposed opposite to each other. Taking one of the limiting members 202 as an example, the limiting member 202 is "L"-shaped, and the first end of the limiting member 202 is fixedly connected to the upper end surface of the assembled plastic part 210, and the second end is perpendicular to the first end and extends in the direction close to the center line of the connecting groove 201, so that a limiting space is formed between the second end of the limiting member 202 close to the side wall of the connecting groove 201 and the bottom wall of the connecting groove 201; when the connecting piece 220 is injection-molded and connected to the connecting groove 201, the upper end surface of the connecting piece 220 abuts against the side wall of the connecting groove 201 close to the second end of the limiting member 202, and the lower end surface of the connecting piece 220 abuts against the bottom wall of the connecting groove 201. The limiting member 202 and the connecting groove 201 cooperate with each other to further improve the connection strength and connection stability between the connecting piece 220 and the connecting groove 201, and at the same time, it can also avoid interference between the connecting piece 220 and the limiting member 202.

[0039] Preferably, the combined plastic part 210 includes a first plastic part 211 and a second plastic part 212. The second plastic part 212 is configured in a flat plate shape. The first plastic part 211 is integrally molded and mounted on the upper end surface of the second plastic part 212. The connecting piece 220 is injection molded and connected to the upper end surface of the first plastic part 211. Because the first plastic part 211 is integrally molded and mounted on the upper end surface of the second plastic part 212, during processing, the combined part 210 can be directly integrally molded and then the connecting piece 220 is injection molded and connected to the upper end surface of the first plastic part 211. This arrangement can omit the processing step of connecting the first and second plastic parts 211, thereby maintaining the desired performance while reducing processing costs.

[0040] In other embodiments, the combined plastic part 210 includes a first plastic part 211 and a second plastic part 212. The second plastic part 212 is configured in a flat plate shape. The first plastic part 211 is movably mounted on the upper end surface of the second plastic part 212. The connecting piece 220 is injection-molded and connected to the upper end surface of the first plastic part 211. Because the first plastic part 211 is movably mounted on the upper end surface of the second plastic part 212, during processing, the connecting piece 220 can be first connected to the first plastic part 211, and then the first plastic part 211, with the connecting piece 220 connected, can be connected to the second plastic part 212, thereby completing the assembly of the cover. During this entire process, because the first plastic part 211 is relatively small, the connecting piece 220 can be connected to the first plastic part 211 more conveniently, thereby improving the overall assembly convenience of the cover.

[0041] When multiple first plastic parts 211 are provided on the second plastic part 212 , it can also be configured such that several first plastic parts 211 are integrally formed and provided on the upper end surface of the second plastic part 212 , and the other several first plastic parts 211 are movably provided on the upper end surface of the second plastic part 212 .

[0042] Furthermore, a connecting skirt 2111 is provided on the outer peripheral wall of the first plastic part 211 . The connecting skirt 2111 extends in a ring shape along the circumference of the first plastic part 211 . The width of the connecting skirt 2111 is set to 1 mm to 10 mm.

[0043] Specifically, by connecting the connecting skirt 2111 to the upper end surface of the second plastic part 212, the first plastic part 211 is connected to the upper end surface of the second plastic part 212, and the connecting skirt 2111 can improve the connection strength and connection stability between the two. According to actual needs, the width of the connecting skirt 2111 is set to 1mm, 4mm, 8mm, 10mm, etc., with a minimum of not less than 1mm and a maximum of not more than 10mm. If the width of the connecting skirt 2111 is too large, the overall volume and weight of the first plastic part 211 and the combined plastic part 210 will be too large, which will not only increase production costs but also affect the aesthetics of the battery case. If the width of the connecting skirt 2111 is too small, the connection strength and connection stability between the first plastic part 211 and the second plastic part 212 cannot be guaranteed, and the processing difficulty when connecting the first plastic part 211 to the second plastic part 212 will be increased.

[0044] Furthermore, the assembly plastic part 210 is provided with a tab through hole 213 corresponding to the connecting piece 220 to allow the tab to pass through.

[0045] In this embodiment, two tab through-holes 213 are provided on the first plastic part 211 corresponding to each connecting piece 220. The two tab through-holes 213 are oppositely arranged on either side of the corresponding connecting groove 201. Two tab through-holes 213 are provided on the second plastic part 212 corresponding to the first plastic part 211. The two tab through-holes 213 on the first plastic part 211 are electrically connected to the two tab through-holes 213 on the second plastic part 212 in a one-to-one correspondence, and both are in communication with the housing 100. After the cover assembly 200 is placed on the housing 100, the tabs on the battery stage group within the housing 100 can extend out of the housing 100 through the corresponding tab through-holes 213. This arrangement can, on the one hand, reduce the space occupied by the tabs within the housing 100, thereby further improving the utilization rate of the internal space of the housing 100. On the other hand, since the tabs can extend out of the housing 100, the tabs can be prevented from being folded or squeezed within the housing 100, thereby preventing the tabs from being deformed.

[0046] Preferably, the cover assembly 200 further includes an explosion-proof valve 230 . Two connecting pieces 220 are spaced apart on the combined plastic part 210 . The explosion-proof valve 230 is disposed on the combined plastic part 210 and is located between the two connecting pieces 220 .

[0047] Specifically, the end surface of the explosion-proof valve 230 is provided with a notch (not shown in the figure), which is used to explode in the event of thermal runaway to achieve the normal pressure relief function of the explosion-proof valve 230, thereby reducing the risk of explosion of the battery pack using the battery housing. In order to make the structure of the entire battery housing more compact, in this embodiment, the explosion-proof valve 230 is arranged between two connecting pieces 220. Specifically, the two connecting pieces 220 are respectively provided as the positive connecting piece 220 and the negative connecting piece 220. The explosion-proof valve 230 can be provided close to the positive connecting piece 220 or the negative connecting piece 220. Since there are two connecting pieces 220, correspondingly, there are two first plastic parts 211. The two first plastic parts 211 are arranged at intervals on the same second plastic part 212. The second plastic part 212 is provided with four tab through holes 213 corresponding to the two first plastic parts 211. The notch can be set on the upper end surface or the lower end surface of the explosion-proof valve 230 according to actual needs, which is not limited in this embodiment. The specific structure of the explosion-proof valve 230 is set with reference to the existing technology and will not be repeated in this embodiment.

[0048] Preferably, the assembled plastic component 210 is further provided with a liquid injection port 240 that communicates with the housing 100. The liquid injection port 240 is disposed between the explosion-proof valve 230 and one of the connecting pieces 220. When the cover assembly 200 is connected to the housing 100, liquid can be directly injected into the battery stage group within the housing 100 through the liquid injection port 240. To improve the overall structural compactness, the liquid injection port 240 is disposed between the explosion-proof valve 230 and one of the connecting pieces 220. In other embodiments, the liquid injection port 240 may not be provided.

[0049] Furthermore, L=-1H~0.5H, wherein L is the distance between the upper end surface of the second plastic part 212 in the assembled plastic part 210 and the upper end surface of the top plate of the housing 100, and H is the thickness of the top plate.

[0050] In this embodiment, the second plastic part 212 is disposed on the top plate of the housing 100. Specifically, the distance between the second plastic part 212 and the top plate of the housing 100 is set based on the actual thickness of the top plate of the lower housing 100. When the distance between the second plastic part 212 and the top plate of the housing 100 is a negative number, the second plastic part 212 is projecting from the top plate of the housing 100. When the distance between the second plastic part 212 and the top plate of the housing 100 is a positive number, the second plastic part 212 is recessed from the top plate of the housing 100. If the distance between the second plastic part 212 and the top plate of the housing 100 is too large, the overall strength of the battery housing will be reduced, thereby shortening the battery housing's service life. If the distance between the second plastic part 212 and the top plate of the housing 100 is too small, the space utilization within the lower housing 100 will be reduced. Therefore, in this embodiment, the preferred setting is L = -1H to 0.5H. In other embodiments, depending on actual needs, the second plastic part 212 is disposed on the front plate or side plate of the housing 100.

[0051] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery housing, comprising a housing (100) and a cover assembly (200), wherein the cover assembly (200) is disposed on the housing (100), the cover assembly (200) comprising a combined plastic part (210) and a connecting piece (220), the combined plastic part (210) being configured as a flat plate structure, characterized in that: The lower end surface of the combined plastic part (210) is connected to the housing (100), and the connecting piece (220) is connected to the upper end surface of the combined plastic part (210).

2. The battery case according to claim 1, wherein: A connecting groove (201) is provided on the upper end surface of the combined plastic part (210), and the connecting piece (220) is injection-molded and connected to the connecting groove (201).

3. The battery case according to claim 2, characterized in that At least one limiting member (202) is provided on the upper end surface of the combined plastic part (210), wherein a first end of the limiting member (202) is fixedly provided on one side of the connecting groove (201), and a second end extends in a direction close to the center line of the connecting groove (201), and the second end of the limiting member (202) abuts against the upper end surface of the connecting piece (220).

4. The battery case according to claim 1, wherein The combined plastic part (210) comprises a first plastic part (211) and a second plastic part (212); the second plastic part (212) is arranged in a flat plate shape; the first plastic part (211) is integrally formed and arranged on the upper end surface of the second plastic part (212); and the connecting piece (220) is injection-molded and connected to the upper end surface of the first plastic part (211).

5. The battery case according to claim 1, wherein: The combined plastic part (210) comprises a first plastic part (211) and a second plastic part (212); the second plastic part (212) is arranged in a flat plate shape; the first plastic part (211) is movably arranged on the upper end surface of the second plastic part (212); and the connecting piece (220) is injection-molded and connected to the upper end surface of the first plastic part (211).

6. The battery case according to claim 5, characterized in that The outer peripheral wall of the first plastic part (211) is provided with a connecting skirt (2111), the connecting skirt (2111) extending in a ring shape along the circumference of the first plastic part (211), and the width of the connecting skirt (2111) is set to 1mm to 10mm.

7. The battery case according to claim 1, characterized in that The combined plastic part (210) is provided with a tab through-hole (213) corresponding to the connecting piece (220) for allowing the tab to pass through.

8. The battery case according to claim 1, wherein: The cover plate assembly (200) further includes an explosion-proof valve (230). Two connecting pieces (220) are spaced apart on the combined plastic part (210). The explosion-proof valve (230) is arranged on the combined plastic part (210) and is located between the two connecting pieces (220).

9. The battery case according to claim 8, characterized in that The combined plastic part (210) is further provided with a liquid injection port (240) in communication with the housing (100), and the liquid injection port (240) is provided between the explosion-proof valve (230) and one of the connecting pieces (220).

10. The battery housing according to any one of claims 1 to 9, characterized in that: L=-1H~0.5H, wherein L is the distance between the upper end surface of the second plastic part (212) in the combined plastic part (210) and the upper end surface of the top plate of the shell (100), and H is the thickness of the top plate.

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