Battery end cover assembly and battery

Abstract

The utility model provides a battery end cover assembly and a battery, and the battery end cover assembly comprises a cover plate which is internally provided with a first electric connection through hole; the first side face of the cover plate is provided with an installation groove, and the installation groove surrounds the periphery of the first electric connection through hole and communicates with the first electric connection through hole. The pole column is arranged in the mounting groove and covers the first electric connection through hole, and an injection molding gap is formed between the peripheral surface of the pole column and the side wall of the mounting groove; the reinforcing columns are arranged on the first side face of the cover plate and surround the periphery of the mounting groove; the injection molding part wraps the peripheral surface of the pole and the reinforcing column and fills the injection molding gap; and the sealing element is arranged between the groove bottom of the mounting groove and the pole. According to the battery end cover assembly provided by the utility model, the fixing strength of the injection molding part is high, and the overall production cost is relatively low.

Description

Technical Field

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

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to activate the active materials after the battery is discharged and continue to be used. Compared with primary batteries, secondary batteries have become a widely used chemical "power source" in the world, with advantages such as stable voltage, safety and reliability, low price, wide application range, abundant raw materials and high recycling rate. In recent years, in order to cope with environmental problems, gasoline price problems and energy storage problems, the application of secondary batteries has rapidly expanded to hybrid vehicles, electric vehicles and energy storage systems.

[0003] In order to lead the electric energy inside the secondary battery to the outside, the battery top cover will have a mounting through hole. However, since the secondary battery is filled with electrolyte, in order to prevent the electrolyte from leaking to the outside and causing safety accidents, a seal needs to be set between the end cover and the electrode terminal for sealing. The sealing between the end cover and the electrode terminal is an important key to ensure battery safety. At present, the end cover and the electrode terminal are generally fixed by injection molding a plastic part on the outside of the end cover. At the same time, a multi-level bump is generally set on the periphery of the pole to increase the difficulty of pulling the pole relative to the cover plate to meet the fixing strength requirements of the pole. However, this will result in a higher pole height, higher material cost, and a more complex production process and higher manufacturing cost, which in turn leads to a higher production cost of the entire battery top cover. Utility Model Content

[0004] Therefore, in order to overcome the above-mentioned problems, the utility model provides a battery end cover assembly which increases the plastic area of ​​the injection molded part based on the reinforcing column on the cover plate, increases the thickness of the injection molded part based on the injection molding gap between the mounting groove on the cover plate and the pole, and ensures the fixing strength of the injection molded part between the pole and the cover plate even when the pole structure is extremely simple, and provides a battery corresponding to the battery end cover assembly.

[0005] According to a first aspect, the utility model provides a battery end cover assembly, comprising:

[0006] A cover plate having a first electrical connection through hole therein; a first side surface of the cover plate having a mounting groove, the mounting groove surrounds the first electrical connection through hole and is connected to the first electrical connection through hole;

[0007] A pole, arranged in the mounting groove and covering the first electrical connection through hole, and an injection molding gap is provided between the peripheral surface of the pole and the side wall of the mounting groove;

[0008] A plurality of reinforcing columns are arranged on the first side surface of the cover plate and surround the four sides of the installation groove;

[0009] Injection molded parts, covering the peripheral surface of the pole and the reinforcing column, and filling the injection molding gap;

[0010] The sealing member is arranged between the bottom of the mounting groove and the pole.

[0011] In an optional embodiment, the diameter of the reinforcing column gradually increases as it moves away from the cover plate.

[0012] In an optional embodiment, there are four reinforcement columns, and the four reinforcement columns are evenly arranged around the installation groove.

[0013] In an optional embodiment, the pole includes a first pole section and a second pole section, the first pole section is located at one end of the pole close to the cover plate, and the diameter of the first pole section is greater than the diameter of the second pole section.

[0014] In an optional embodiment, the battery end cap assembly further includes:

[0015] The insulating plate is arranged on the second side surface of the cover plate, and has a second electrical connection through hole corresponding to the first electrical connection through hole.

[0016] In an optional embodiment, the edge of the second electrical connection through hole is bent toward the first side to form a ring, and the top of the ring abuts against the pole; the sealing member is located between the outer peripheral surface of the ring and the injection molded part.

[0017] According to the second aspect, the utility model also provides a battery, comprising:

[0018] The shell, the electrode assembly and the battery end cover assembly in any one of the embodiments of the first aspect above, the electrode assembly is arranged in the shell, and the battery end cover assembly covers the opening of the shell; the pole is electrically connected to the electrode assembly.

[0019] The technical solution of the utility model has the following advantages:

[0020] 1. The battery end cover assembly provided by the utility model can increase the plastic area of ​​the injection molded part covering the reinforcing columns by arranging a plurality of reinforcing columns on the first side surface (i.e., the outer side surface) of the cover plate, so that the plastic strength of the injection molded part is still relatively high when the pole height is relatively low and the pole structure is relatively simple; at the same time, by arranging a mounting groove on the first side surface of the cover plate, and arranging an injection molding gap between the pole located in the mounting groove and the mounting groove, the injection molded part can still have a large thickness and a high fixing strength when the pole height is relatively low and the structure is relatively simple; and the cost of arranging the reinforcing columns is much lower than the material cost caused by the high pole height and the process cost caused by the complex structure of the pole, so that the battery end cover assembly can have a low cost on the basis of high structural strength.

[0021] 2. The battery end cover assembly provided by the utility model has a relatively large diameter of the first column section of the pole close to the cover plate, so that a protrusion is formed at one end of the pole close to the cover plate. When the pole is surrounded by the injection molded part, the protrusion completely covered by the injection molded part can increase the difficulty of pulling the pole relative to the cover plate, thereby further improving the plastic effect of the injection molded part and increasing the fixing strength between the pole and the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a battery end cover assembly provided by an embodiment of the utility model;

[0024] Figure 2 An exploded schematic diagram of a battery end cover assembly provided by an embodiment of the utility model;

[0025] Figure 3 A partial cross-sectional view of a battery end cover assembly provided by an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of the positional relationship between the pole and the mounting groove in the battery end cover assembly provided by an embodiment of the utility model;

[0027] Description of reference numerals:

[0028] 1-cover plate; 11-first electrical connection through hole; 12-mounting groove; 12a-injection molding gap;

[0029] 2-pole; 2a-first column section; 2b-second column section;

[0030] 3- Strengthening column;

[0031] 4-Injection molded parts;

[0032] 5- Seal;

[0033] 6-insulating plate; 61-second electrical connection through hole; 62-circular ring. DETAILED DESCRIPTION

[0034] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0038] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the present invention, or those features that are not relevant to the implementation of the present invention) may be described. Moreover, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0039] The embodiment of the utility model provides a battery, which can be applied to the fields of oil-electric hybrid vehicles or electric vehicles. Specifically, the battery includes a shell, an electrode assembly and a battery end cover assembly, wherein the electrode assembly is arranged in the shell, the battery end cover assembly covers the opening of the shell, and the poles (including positive poles and negative poles) in the battery end cover assembly are electrically connected to the electrode assembly.

[0040] Please refer to Figure 1-Figure 4, is a schematic structural diagram of a battery end cover assembly provided by an embodiment of the utility model, the battery end cover assembly includes a cover plate 1, a pole 2, a reinforcing column 3, an injection molded part 4 and a sealing part 5. Among them, the cover plate 1 has a first electrical connection through hole 11, and the first side surface of the cover plate 1 has a mounting groove 12, the mounting groove 12 surrounds the first electrical connection through hole 11 and is connected to the first electrical connection through hole 11; the pole 2 is arranged in the mounting groove 12 and covers the first electrical connection through hole 11, and there is an injection molding gap 12a between the circumference of the pole 2 and the side wall of the mounting groove 12; a plurality of reinforcing columns 3 are arranged on the first side surface of the cover plate 1 and surround the circumference of the mounting groove 12; the injection molded part 4 covers the circumference of the pole 2 and the reinforcing column 3, and fills the injection molding gap 12a; the sealing part 5 is arranged between the bottom of the mounting groove 12 and the pole 2.

[0041] Specifically, Figure 1 and Figure 2 As shown, there are two first electrical connection through holes 11 on the cover plate 1, and the pole 2, the reinforcing pole 3, the injection molded part 4 and the sealing part 5 are also two groups corresponding to the first electrical connection through holes 11; the two poles 2 are respectively a positive pole and a negative pole, and except that the metal materials of the positive pole and the negative pole are different, the components at the two first electrical connection through holes 11 and the connection relationship between the components are exactly the same.

[0042] Specifically, the cover plate 1 between the two first electrical connection through holes 11 also has a liquid injection hole and an explosion-proof valve installation hole, etc., but since they are not the core innovation of this embodiment, this application will not repeat them. The structure of the liquid injection hole, explosion-proof valve installation hole and explosion-proof valve in this embodiment can be any one of the existing structures.

[0043] Specifically, the first side of the cover plate 1 refers to the side of the cover plate 1 away from the shell when the battery end cover assembly covers the opening of the battery shell (i.e. Figure 2 The upper side of the cover plate 1 in the position shown in the figure), the first side can also be called the outer side; the side of the cover body opposite to the first side is the second side, which is the side of the cover plate 1 facing the shell when the battery end cover assembly covers the opening of the battery shell (that is, Figure 2 The second side surface is the lower side surface of the cover plate 1 in the shown position state), and the second side surface can also be called the outer side surface.

[0044] Specifically, the reinforcing column 3 can be welded to the cover plate 1 , or can be integrally formed with the cover plate 1 .

[0045] Specifically, the number of reinforcing columns 3 can be set according to the plastic strength requirements of the injection molded part 4 in a specific application scenario. Specifically, the number of reinforcing columns 3 can be two or more, and the two or more reinforcing columns 3 are evenly arranged around the mounting groove 12; Figure 2As shown in FIG. 4 , the four reinforcing columns 3 are evenly arranged around the mounting groove 12 .

[0046] Specifically, the insulation requirement of the second side of the cover plate 1 (the insulation requirement between the electrode assembly in the battery) can be achieved by providing an insulating layer on the second side of the cover plate 1. The insulating layer can be formed by coating an insulating material on the second side of the cover plate 1, or by pasting a prefabricated insulating film on the cover plate 1.

[0047] Specifically, the insulation requirement of the second side of the cover plate 1 can also be achieved by providing an insulating plate 6 on the second side of the cover plate 1. Figure 2 As shown, the insulating plate 6 has a second electrical connection through hole 61 corresponding to the first electrical connection through hole 11. Specifically, the insulating plate 6 can be buckled on the second side of the cover plate 1, that is, corresponding buckling columns and buckling grooves can be provided on the insulating plate 6 and the cover plate 1, respectively, so that the connection between the insulating plate 6 and the cover plate 1 is achieved by pressing the buckling columns into the buckling grooves.

[0048] In this embodiment, in order to further increase the plastic area of ​​the injection molded part 4 and improve the fixing strength of the injection molded part 4, as shown in FIG. Figure 3 As shown, the diameter of the reinforcing column 3 can be set to gradually increase in the process of moving away from the cover plate 1; that is, the reinforcing column 3 is a trapezoidal column. Specifically, those skilled in the art should understand that based on the insulation requirements between the reinforcing column 3 and the pole 2 (that is, the insulation requirements between the cover plate 1 and the pole 2), although the top end of the reinforcing column 3 (that is, the end of the reinforcing column 3 away from the cover plate) has a larger diameter, it is still necessary to ensure that there is a certain gap between the top end of the reinforcing column 3 and the pole 2.

[0049] In this embodiment, in order to further improve the fixing strength of the injection molded part 4, as shown in FIG. Figure 3 As shown, the pole 2 may include a first column section 2a and a second column section 2b, wherein the first column section 2a is located at one end of the pole 2 close to the cover plate 1, and the diameter of the first column section 2a is greater than the diameter of the second column section 2b. That is, by setting the diameter of the first column section 2a of the pole 2 close to the cover plate 1 to be relatively large, a protrusion is formed at one end of the pole 2 close to the cover plate 1, so that when the surrounding of the pole 2 is covered by the injection molded part 4, the protrusion completely covered in the injection molded part 4 can increase the difficulty of pulling the pole 2 relative to the cover plate 1, thereby further improving the plastic effect of the injection molded part 4 and increasing the fixing strength between the pole 2 and the cover plate 1.

[0050] In this embodiment, in order to further ensure the insulation of the cover plate 1 relative to the pole 2 and the electrode assembly inside the shell, and further improve the sealing effect of the battery end cover assembly, as shown in FIG. Figure 2 and Figure 3As shown, as an optional specific implementation, the edge of the second electrical connection through hole 61 of the insulating plate 6 can be bent toward the first side to form a circular ring 62, and when the insulating plate 6 is buckled with the second side of the cover plate 1, the top of the circular ring 62 abuts against the pole 2, and the seal 5 is located between the outer peripheral surface of the circular ring 62 and the injection molded part 4.

[0051] In summary, the battery end cover assembly in the implementation of the utility model can increase the plastic area of ​​the injection molded part 4 covering the reinforcing column 3 by setting a reinforcing column 3 on the first side surface (that is, the outer side surface) of the cover plate 1, so that when the pole 2 has a low height and a relatively simple structure, the plastic strength of the injection molded part 4 is still relatively high; at the same time, by setting a mounting groove 12 on the first side surface of the cover plate 1, and setting an injection molding gap 12a between the pole 2 located in the mounting groove 12 and the mounting groove 12, the injection molded part 4 can still have a large thickness and a high fixing strength when the pole 2 has a low height and a relatively simple structure; and the setting cost of the reinforcing column 3 is much lower than the material cost caused by the high height of the pole 2 and the process cost caused by the complex structure of the pole 2. Therefore, the battery end cover assembly can have a low cost on the basis of high structural strength.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A battery end cap assembly, characterized in that: include: A cover plate (1) having a first electrical connection through hole (11) therein; a first side surface of the cover plate (1) having a mounting groove (12), the mounting groove (12) surrounding the first electrical connection through hole (11) and being in communication with the first electrical connection through hole (11); A pole (2) is arranged in the installation groove (12) and covers the first electrical connection through hole (11), and an injection molding gap (12a) is provided between the peripheral surface of the pole (2) and the side wall of the installation groove (12); A plurality of reinforcing columns (3) are arranged on the first side surface of the cover plate (1) and surround the four sides of the installation groove (12); An injection molded part (4) covers the circumference of the pole (2) and the reinforcing column (3), and fills the injection molding gap (12a); A sealing member (5) is arranged between the bottom of the mounting groove (12) and the pole (2).

2. The battery end cap assembly according to claim 1, characterized in that: The diameter of the reinforcing column (3) gradually increases as it moves away from the cover plate (1).

3. The battery end cap assembly according to claim 2, characterized in that: There are four reinforcing columns (3), and the four reinforcing columns (3) are evenly arranged around the four sides of the installation groove (12).

4. The battery end cover assembly according to any one of claims 1 to 3, characterized in that: The pole (2) comprises a first pole section (2a) and a second pole section (2b), wherein the first pole section (2a) is located at one end of the pole (2) close to the cover plate (1), and the diameter of the first pole section (2a) is greater than the diameter of the second pole section (2b).

5. The battery end cap assembly according to claim 4, characterized in that: Also includes: An insulating plate (6) is arranged on the second side surface of the cover plate (1), and the insulating plate (6) has a second electrical connection through hole (61) corresponding to the first electrical connection through hole (11).

6. The battery end cap assembly according to claim 5, characterized in that: The edge of the second electrical connection through hole (61) is bent toward the first side surface to form a circular ring (62), and the top of the circular ring (62) is in contact with the pole (2); the sealing member (5) is located between the outer peripheral surface of the circular ring (62) and the injection molded part (4).

7. A battery, characterized in that: include: A shell, an electrode assembly and a battery end cover assembly as described in any one of claims 1 to 6, wherein the electrode assembly is arranged in the shell, and the battery end cover assembly covers the opening of the shell; the pole is electrically connected to the electrode assembly.

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