Battery case

Abstract

The utility model provides a battery shell and relates to the technical field of batteries. The battery shell comprises an upper cover and a lower shell used for containing a pole group, the upper cover comprises a cover plate assembly and a connecting piece, the lower end face of the cover plate assembly is connected to the lower shell, the connecting piece is connected to the upper end face of the cover plate assembly, and the cover plate assembly is provided with a pole lug extending hole and a pole lug shaping part corresponding to the connecting piece. And the tabs of the stage group can extend out of the lower shell through the tab extending holes and are accommodated in the tab shaping parts. The battery shell can prevent deformation or friction damage of the tabs, avoids short circuit between the tabs and the lower shell, and improves the space utilization rate of the lower shell.

Description

Technical Field

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

[0002] Existing lithium batteries include a housing, a cover plate, and a pole group disposed within the housing. The tabs of the pole group are bent. During actual assembly and subsequent use of the lithium battery, the tabs are located between the top cover assembly and the pole group, making their shape difficult to control. This can lead to deformation or friction damage due to folding, or contact between the tabs and the housing, causing a short circuit. Furthermore, because the connector tabs in existing lithium batteries are located below the top cover assembly, placing the top cover assembly behind the housing's open end reduces space utilization within the housing. Utility Model Content

[0003] The purpose of the utility model is to provide a battery housing, which can prevent the tabs from being deformed or damaged by friction, avoid short circuits between the tabs and the lower housing, and improve the space utilization of the lower housing.

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

[0005] The battery shell includes an upper cover and a lower shell for accommodating the stage group. The upper cover includes a cover plate assembly and a connecting piece. The lower end face of the cover plate assembly is connected to the lower shell. The connecting piece is connected to the upper end face of the cover plate assembly. The cover plate assembly is provided with a tab extension hole and a tab shaping portion corresponding to the connecting piece. The tab of the stage group can extend out of the lower shell through the tab extension hole and be accommodated in the tab shaping portion.

[0006] As a further technical solution, the tab shaping portion is arranged on the upper end surface of the cover assembly, and the tab shaping portion is arranged as a receiving groove recessed toward the lower end surface of the cover assembly, and the receiving groove is located on the side corresponding to the tab extension hole.

[0007] As a further technical solution, there are two tab extension holes, which are arranged on both sides of the corresponding connecting piece, and the accommodating grooves are correspondingly provided on both sides of each tab extension hole.

[0008] As a further technical solution, the upper end surface of the cover assembly is provided with a mounting groove, and the connecting piece is injection-molded and connected to the mounting groove.

[0009] As a further technical solution, at least one auxiliary mounting member is provided on the upper end surface of the cover assembly. The auxiliary mounting member is provided on one side of the mounting groove and cooperates with the mounting groove to form a limiting space capable of accommodating the connecting piece.

[0010] As a further technical solution, an explosion-proof valve and a liquid injection port are provided on the upper end surface of the cover plate assembly, and both the explosion-proof valve and the liquid injection port are communicated with the lower shell.

[0011] As a further technical solution, the cover assembly includes a first plastic part and a second plastic part, the first plastic part is integrally formed and arranged on the upper end surface of the second plastic part, the connecting piece is injection molded and connected to the upper end surface of the first plastic part, and the lower end surface of the second plastic part is connected to the lower shell.

[0012] As a further technical solution, the cover assembly includes a first plastic part and a second plastic part, the first plastic part is movably arranged on the upper end surface of the second plastic part, the connecting piece is injection-molded and connected to the upper end surface of the first plastic part, and the lower end surface of the second plastic part is connected to the lower shell.

[0013] As a further technical solution, the first plastic part is connected to the second plastic part via an auxiliary mounting plate, and the width of the auxiliary mounting plate is set to 1 mm to 10 mm.

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

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

[0016] 1. Because the connecting piece is injection-molded to the upper end face of the cover assembly, when the cover assembly is attached to the lower housing, the connecting piece is outside the lower housing, thereby reducing the amount of space occupied by the connecting piece within the lower housing and improving the internal space utilization of the lower housing. In addition, because the connecting piece is injection-molded to the upper end face of the cover assembly, the connection convenience, connection strength, and connection stability between the two are improved, while further reducing the gap between the connecting piece and the cover assembly, thereby reducing the spatial volume of the cover assembly and achieving the technical effect of reducing the amount of space occupied by the cover assembly within the lower housing.

[0017] 2. Because the tab extension holes are provided on the cover assembly, when the cover assembly is connected to the lower housing, the tabs inside the lower housing can extend out of the lower housing through the corresponding tab extension holes. This arrangement, on the one hand, reduces the amount of space occupied by the tabs within the lower housing, thereby further improving the internal space utilization of the lower housing. On the other hand, because the tabs can extend out of the lower housing, they can prevent the tabs from being folded or squeezed inside the lower housing, causing the tabs to deform, thereby reducing the tab deformation rate.

[0018] 3. Since the tab shaping portion is provided on the cover plate assembly, after the tab extends out of the lower shell through the corresponding tab extension hole, it is gathered at the corresponding tab shaping portion to prevent the tab from being damaged due to friction. At the same time, it can avoid the tab from short-circuiting due to poor retraction shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 This is an exploded view of a battery housing provided by an embodiment of the present utility model;

[0021] Figure 2 This is a schematic structural diagram of a battery housing provided by an embodiment of the present utility model;

[0022] Figure 3 This is a cross-sectional view of the battery housing provided by an embodiment of the present utility model in the first direction;

[0023] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0024] Figure 5 It is a cross-sectional view of the battery housing provided by an embodiment of the present utility model in the second direction.

[0025] In the picture:

[0026] 100, upper cover; 110, cover plate assembly; 111, first plastic part; 112, second plastic part; 113, mounting auxiliary plate; 101, tab extension hole; 102, tab shaping portion; 103, mounting groove; 104, auxiliary mounting part; 105, explosion-proof valve; 106, liquid injection port; 120, connecting piece;

[0027] 200. Lower shell. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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).

[0033] 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.

[0034] 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.

[0035] Combine Figures 1 to 5 As shown, the battery case provided in this embodiment (hereinafter referred to as the battery case) can prevent deformation or friction damage of the tabs, avoid short circuit between the tabs and the lower shell 200, and improve the space utilization of the lower shell 200. Specifically, the battery case includes an upper cover 100 and a lower shell 200 for accommodating the stage group. The upper cover 100 includes a cover plate assembly 110 and a connecting piece 120. The lower end surface of the cover plate assembly 110 is connected to the lower shell 200, and the connecting piece 120 is connected to the upper end surface of the cover plate assembly 110. The cover plate assembly 110 is provided with a tab extension hole 101 and a tab shaping portion 102 corresponding to the connecting piece 120. The tabs of the stage group can extend out of the lower shell 200 through the tab extension hole 101 and be accommodated in the tab shaping portion 102.

[0036] Because the connecting piece 120 is injection-molded to the upper end surface of the cover assembly 110, when the cover assembly 110 is connected to the lower housing 200, the connecting piece 120 is outside the lower housing 200, thereby reducing the amount of space occupied by the connecting piece 120 within the lower housing 200, thereby improving the internal space utilization of the lower housing 200. In addition, because the connecting piece 120 is injection-molded to the upper end surface of the cover assembly 110, the connection convenience, connection strength, and connection stability between the two are improved, while further reducing the gap between the connecting piece 120 and the cover assembly 110, thereby reducing the spatial volume of the cover assembly 110, thereby achieving the technical effect of reducing the amount of space occupied by the cover assembly 110 within the lower housing 200.

[0037] Since the tab extension holes 101 are provided on the cover assembly 110, when the cover assembly 110 is connected to the lower housing 200, the tabs inside the lower housing 200 can extend out of the lower housing 200 through the corresponding tab extension holes 101. This arrangement, on the one hand, can reduce the amount of space occupied by the tabs within the lower housing 200, thereby further improving the internal space utilization of the lower housing 200; on the other hand, since the tabs can extend out of the lower housing 200, it can prevent the tabs from being folded or squeezed inside the lower housing 200, thereby reducing the deformation rate of the tabs.

[0038] Since the tab shaping portion 102 is provided on the cover plate assembly 110, after the tab extends out of the lower shell 200 through the corresponding tab extension hole 101, it is gathered at the corresponding tab shaping portion 102 to prevent the tab from being damaged due to friction. At the same time, it can avoid the tab from contacting the shell due to poor retraction shape and causing a short circuit.

[0039] Preferably, the tab shaping portion 102 is provided on the upper end surface of the cover assembly 110 and is provided as a recessed receiving groove close to the lower end surface of the cover assembly 110, and the receiving groove is located on one side of the corresponding tab extension hole 101. In this configuration, the receiving groove ensures the corresponding tab convergence effect, preventing the tab from contacting the housing due to poor convergence and causing a short circuit, while minimizing the overall thickness of the cover assembly 110, thereby reducing the space occupied by the upper cover 100 in the lower housing 200.

[0040] Furthermore, two tab extension holes 101 are provided, and the two tab extension holes 101 are oppositely arranged on either side of the corresponding connecting piece 120, and a receiving groove is provided on both sides of each tab extension hole 101. This arrangement ensures that when the tab extends out of the lower housing 200 from the corresponding tab extension hole 101, it is gathered in the receiving groove closest to the corresponding tab extension hole 101, thereby further reducing the risk of tab deformation or damage.

[0041] Preferably, the upper end surface of the cover assembly 110 is provided with a mounting groove 103, and the connecting piece 120 is injection-molded and connected to the mounting groove 103. The cross-sectional area of ​​the mounting groove 103 is larger than the cross-sectional area of ​​the connecting piece 120, and the mounting groove 103 is recessed in the upper end surface of the cover assembly 110. When the connecting piece 120 is injection-molded and connected to the mounting groove 103, not only is the connection strength and stability between the connecting piece 120 and the cover assembly 110 improved, but the overall thickness of the upper cover 100 can also be minimized, thereby further reducing the space occupied by the upper cover 100 within the lower housing 200.

[0042] Furthermore, at least one auxiliary mounting member 104 is provided on the upper end surface of the cover assembly 110 . The auxiliary mounting member 104 is provided on one side of the mounting groove 103 and cooperates with the mounting groove 103 to form a limiting space capable of accommodating the connecting piece 120 .

[0043] Specifically, in this embodiment, two auxiliary mounting members 104 are provided. Both auxiliary mounting members 104 are fixedly disposed at the open end of the mounting groove 103 , and the two auxiliary mounting members 104 are disposed opposite to each other. Taking one of the auxiliary mounting parts 104 as an example, the auxiliary mounting part 104 is "L"-shaped, and the first end of the auxiliary mounting part 104 is fixedly connected to the upper end surface of the cover assembly 110, and the second end is perpendicular to the first end and extends toward the center line of the mounting groove 103, so that a limiting space is formed between the second end of the auxiliary mounting part 104 close to the side wall of the mounting groove 103 and the bottom wall of the mounting groove 103; when the connecting piece 120 is injection-molded and connected to the mounting groove 103, the upper end surface of the connecting piece 120 abuts against the side wall of the mounting groove 103 close to the second end of the auxiliary mounting part 104, and the lower end surface of the connecting piece 120 abuts against the bottom wall of the mounting groove 103. The auxiliary mounting part 104 and the mounting groove 103 cooperate with each other to further improve the connection strength and connection stability between the connecting piece 120 and the mounting groove 103, and at the same time, it can also avoid interference between the connecting piece 120 and the auxiliary mounting part 104.

[0044] Preferably, an explosion-proof valve 105 and a liquid injection port 106 are provided on the upper end surface of the cover plate assembly 110 , and both the explosion-proof valve 105 and the liquid injection port 106 are in communication with the lower housing 200 .

[0045] Specifically, the end face of the explosion-proof valve 105 is provided with a notch (not shown in the figure), which is used to explode in a thermal runaway state to achieve the normal pressure relief function of the explosion-proof valve 105, thereby reducing the risk of explosion of the battery pack using the battery shell. In order to make the structure of the entire battery shell more compact, in this embodiment, the explosion-proof valve 105 is arranged between the two connecting pieces 120. Specifically, the two connecting pieces 120 are respectively provided as the positive connecting piece 120 and the negative connecting piece 120. The explosion-proof valve 105 can be provided close to the positive connecting piece 120 or close to the negative connecting piece 120. The notch can be provided on the upper end face or the lower end face of the explosion-proof valve 105 according to actual needs. It is not limited in this embodiment. The specific structure of the explosion-proof valve 105 is provided with reference to the prior art and will not be described in detail in this embodiment.

[0046] After the cover assembly 110 is connected to the lower housing 200, liquid can be directly injected into the battery stage group in the lower housing 200 through the liquid injection port 106. To improve the overall structural compactness, the liquid injection port 106 is provided between the explosion-proof valve 105 and one of the connecting pieces 120. In other embodiments, the liquid injection port 106 may not be provided.

[0047] Preferably, the cover assembly 110 includes a first plastic part 111 and a second plastic part 112. The first plastic part 111 is integrally formed and disposed on the upper end surface of the second plastic part 112. The connecting piece 120 is injection molded and connected to the upper end surface of the first plastic part 111. The lower end surface of the second plastic part 112 is connected to the lower housing 200. Because the first plastic part 111 is integrally formed and disposed on the upper end surface of the second plastic part 112, during processing, the assembly and subsequent connection can be directly completed by integral molding, and then the connecting piece 120 is injection molded and connected to the upper end surface of the first plastic part 111. This arrangement can omit the processing step of connecting the first plastic part 111 and the second plastic part 112, thereby maintaining the performance while reducing processing costs.

[0048] In other embodiments, the cover assembly 110 includes a first plastic part 111 and a second plastic part 112. The first plastic part 111 is movably mounted on the upper end surface of the second plastic part 112. The connecting piece 120 is injection-molded and connected to the upper end surface of the first plastic part 111. The lower end surface of the second plastic part 112 is connected to the lower housing 200. Because the first plastic part 111 is movably mounted on the upper end surface of the second plastic part 112, during processing, the connecting piece 120 can be first connected to the first plastic part 111, and then the first plastic part 111, with the connecting piece 120 connected, can be connected to the second plastic part 112, thereby completing the assembly of the cover assembly 110. During this entire process, because the first plastic part 111 is relatively small, the connection of the connecting piece 120 to the first plastic part 111 can be improved, thereby improving the overall assembly convenience of the cover assembly 110.

[0049] When multiple first plastic parts 111 are provided on the second plastic part 112 , it can also be configured such that several first plastic parts 111 are integrally formed and provided on the upper end surface of the second plastic part 112 , and the other several first plastic parts 111 are movably provided on the upper end surface of the second plastic part 112 .

[0050] In addition, since there are two connecting pieces 120 , correspondingly, there are two first plastic parts 111 . The two first plastic parts 111 are spaced apart and arranged on the same lower second plastic part 112 . The second plastic part 112 is provided with four tab extension holes 101 corresponding to the two first plastic parts 111 .

[0051] Furthermore, the first plastic part 111 is connected to the second plastic part 112 via an auxiliary mounting plate 113 , and the width of the auxiliary mounting plate 113 is set to 1 mm to 10 mm.

[0052] Specifically, the mounting auxiliary plate 113 extends in an annular shape along the circumference of the first plastic part 111. The mounting auxiliary plate 113 is connected to the upper end surface of the second plastic part 112 to achieve connection between the first plastic part 111 and the upper end surface of the second plastic part 112. The mounting auxiliary plate 113 can improve the connection strength and stability between the two. According to actual needs, the width of the mounting auxiliary plate 113 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 mounting auxiliary plate 113 is too large, the overall volume and weight of the first plastic part 111 and the cover plate assembly 110 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 mounting auxiliary plate 113 is too small, the connection strength and stability between the first plastic part 111 and the second plastic part 112 cannot be guaranteed, and the processing difficulty of connecting the first plastic part 111 to the second plastic part 112 will be increased.

[0053] Further, X=-1Y~0.5Y, wherein L is the distance between the upper end surface of the second plastic part 112 in the cover assembly 110 and the upper end surface of the top plate of the lower shell 200, and H is the thickness of the top plate.

[0054] In this embodiment, the second plastic component 112 is disposed on the top plate of the lower housing 200. Specifically, the distance between the second plastic component 112 and the top plate of the lower housing 200 is set based on the actual thickness of the top plate of the lower housing 200. When the distance between the second plastic component 112 and the top plate of the lower housing 200 is a negative number, the second plastic component 112 is projecting from the top plate of the lower housing 200. When the distance between the second plastic component 112 and the top plate of the lower housing 200 is a positive number, the second plastic component 112 is recessed from the top plate of the lower housing 200. If the distance between the second plastic component 112 and the top plate of the lower housing 200 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 component 112 and the top plate of the lower housing 200 is too small, the space utilization within the lower housing 200 will be reduced. Therefore, in this embodiment, the preferred setting is X = -1Y to 0.5Y. In some other embodiments, according to actual needs, the second plastic part 112 may also be disposed on the side panel or the front panel of the lower housing 200 .

[0055] 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 an upper cover (100) and a lower housing (200) for accommodating a stage group, wherein the upper cover (100) comprises a cover assembly (110) and a connecting piece (120), and the lower end surface of the cover assembly (110) is connected to the lower housing (200), characterized in that: The connecting piece (120) is connected to the upper end surface of the cover plate assembly (110); a tab extension hole (101) and a tab shaping portion (102) are provided on the cover plate assembly (110) corresponding to the connecting piece (120); the tabs of the stage group can extend out of the lower shell (200) through the tab extension hole (101) and be accommodated in the tab shaping portion (102).

2. The battery case according to claim 1, wherein: The tab shaping portion (102) is provided on the upper end surface of the cover plate assembly (110), and the tab shaping portion (102) is provided as a receiving groove recessed toward the lower end surface of the cover plate assembly (110), and the receiving groove is located on a side corresponding to the tab extension hole (101).

3. The battery case according to claim 2, characterized in that Two tab extension holes (101) are provided, and the two tab extension holes (101) are relatively arranged on both sides of the corresponding connecting piece (120), and the accommodating groove is correspondingly provided on both sides of each tab extension hole (101).

4. The battery case according to claim 1, wherein: The upper end surface of the cover plate assembly (110) is provided with a mounting groove (103), and the connecting piece (120) is injection-molded and connected to the mounting groove (103).

5. The battery case according to claim 4, characterized in that At least one auxiliary mounting member (104) is provided on the upper end surface of the cover plate assembly (110); the auxiliary mounting member (104) is provided on one side of the mounting groove (103) and cooperates with the mounting groove (103) to form a limiting space capable of accommodating the connecting piece (120).

6. The battery case according to claim 1, wherein: An explosion-proof valve (105) and a liquid injection port (106) are provided on the upper end surface of the cover plate assembly (110), and both the explosion-proof valve (105) and the liquid injection port (106) are in communication with the lower housing (200).

7. The battery case according to claim 1, characterized in that The cover plate assembly (110) comprises a first plastic part (111) and a second plastic part (112); the first plastic part (111) is integrally formed and arranged on the upper end surface of the second plastic part (112); the connecting piece (120) is injection-molded and connected to the upper end surface of the first plastic part (111); and the lower end surface of the second plastic part (112) is connected to the lower shell (200).

8. The battery case according to claim 1, wherein: The cover plate assembly (110) comprises a first plastic part (111) and a second plastic part (112); the first plastic part (111) is movably arranged on the upper end surface of the second plastic part (112); the connecting piece (120) is injection-molded and connected to the upper end surface of the first plastic part (111); and the lower end surface of the second plastic part (112) is connected to the lower shell (200).

9. The battery case according to claim 8, characterized in that The first plastic part (111) is connected to the second plastic part (112) via an auxiliary mounting plate (113), and the width of the auxiliary mounting plate (113) is set to 1 mm to 10 mm.

10. The battery housing according to any one of claims 1 to 9, characterized in that: X=-1Y~0.5Y, wherein L is the distance between the upper end surface of the second plastic part (112) in the cover plate assembly (110) and the upper end surface of the top plate of the lower shell (200), and H is the thickness of the top plate.

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