Top cover structure of square shell battery

Abstract

According to the top cover structure of the square-shell battery, in the top cover structure, a top cover sheet is provided with a horizontal upper surface; the flange edge is at least partially arranged around the top cover plate and is flush with the upper surface of the top cover plate; the metal protective ring is vertically fixed on the upper surface; the pole plastic part is arranged in the metal protective ring; the pole metal piece surrounds the pole plastic piece and is located between the pole plastic piece and the metal protection ring. The top cover structure prevents the sealing ring from being burnt to cause sealing failure of a battery cell pole column area, and avoids liquid leakage.

Description

Technical Field

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

[0002] At present, square shell batteries have been widely used in many fields. Due to their widespread use and safety needs, the safety and reliability of batteries has become an important issue. Ensuring the safety and reliability of batteries can not only provide protection for the safety of new energy vehicles, but also have the same significance in the fields of energy storage and equipment power supply.

[0003] Usually, when welding the cell cover and the shell, the welding laser is required to act only on the welding area, and the heat-affected zone and the laser do not affect the battery structure other than the welding area. After the welding is completed, the cover and the shell are integrated, the weld plays a role of pressure resistance and sealing, and the other areas of the battery cell remain intact and clean after welding. However, in the actual welding process, due to the dimensional tolerance fluctuations of the top cover and shell materials, as well as process control problems in the production and assembly process, the shell opening will be higher than the top cover surface after the shell entry process, forming a "negative step" on the top cover. Once the negative step is formed, the laser is prone to reflection during the welding process. When the reflected laser hits the plastic part of the top cover pole, it will cause the plastic to burn and carbonize, and even burn the sealing ring, causing the sealing of the cell pole area to fail and cause leakage problems.

[0004] Therefore, it is necessary to design an improved top cover structure from the design end to improve the safety and reliability of the battery.

[0005] The above information disclosed in the background technology section is only used to enhance the understanding of the background of the present invention and therefore may contain information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0006] The utility model aims to provide a top cover structure of a square shell battery, which can avoid burning of a sealing ring to cause sealing failure in a cell pole area and eliminate the problem of liquid leakage.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A top cover structure of a square shell battery of the utility model comprises:

[0009] a top cover sheet having a horizontal upper surface;

[0010] A flange edge, which is at least partially arranged around the top cover sheet and is flush with the upper surface of the top cover sheet;

[0011] a metal protective ring vertically fixed on the upper surface;

[0012] A plastic pole part, which is installed in the metal protective ring;

[0013] The pole metal piece surrounds the pole plastic piece and is located between the pole plastic piece and the metal protection ring.

[0014] In the top cover structure of the square shell battery, the flange edge is a C-shaped structure that partially surrounds the top cover sheet.

[0015] In the top cover structure of the square shell battery, the flange edge is an annular structure that completely surrounds the top cover sheet.

[0016] In the top cover structure of the square shell battery, the top cover sheet is a rectangular sheet structure.

[0017] In the top cover structure of the square shell battery, the metal protective ring is a cylindrical structure.

[0018] In the top cover structure of the square shell battery, the height of the pole metal piece is flush with the top of the metal protective ring.

[0019] In the top cover structure of the square shell battery, the height of the pole plastic part is higher than the height of the pole metal part.

[0020] In the top cover structure of the square shell battery, the top cover sheet is provided with an annular groove.

[0021] In the top cover structure of the square shell battery, the metal protective ring is embedded in the annular groove.

[0022] In the top cover structure of the square shell battery, the metal protective ring, the pole metal part and the pole plastic part are quadrilateral structures.

[0023] In the above technical solution, the top cover structure of a square shell battery provided by the utility model has the following beneficial effects: the top cover structure of a square shell battery described in the utility model has a metal protective ring, which can block the reflection of the welding laser and prevent the laser from burning the plastic structure of the pole. When the top cover is assembled, due to the presence of the flange edge, when the top cover is assembled and pressed down, the shell opening height will be limited by the flange edge and will not exceed the upper surface of the top cover, thereby fundamentally avoiding the possibility of negative step reflection of the welding laser.

[0024] The presence of the flange edge limits the overpressure of the top cover by the tooling robot in the shell insertion process, which can reduce the frequency of steps and effectively improve the shell insertion yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A schematic structural diagram of a top cover structure of a square shell battery provided in an embodiment of the utility model.

[0027] Figure 2 A schematic side view of a top cover structure of a square shell battery provided in an embodiment of the utility model.

[0028] Figure 3 A schematic side view of a top cover structure of a square shell battery provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] See also Figure 1-3 As shown, in one embodiment, a top cover structure of a square shell battery of the utility model includes:

[0038] A top cover sheet 1 having a horizontal upper surface;

[0039] A flange edge 2, which is at least partially arranged around the top cover sheet 1 and is flush with the upper surface of the top cover sheet 1;

[0040] A metal protective ring 3, which is vertically fixed on the upper surface;

[0041] A pole plastic part 4, which is installed in the metal protection ring 3;

[0042] The pole metal piece 5 surrounds the pole plastic piece 4 and is located between the pole plastic piece 4 and the metal protection ring 3 .

[0043] In a preferred embodiment of the top cover structure of the square shell battery, the flange edge 2 is a C-shaped structure partially surrounding the top cover sheet 1.

[0044] In a preferred embodiment of the top cover structure of the square shell battery, the flange edge 2 is an annular structure completely surrounding the top cover sheet 1.

[0045] In a preferred embodiment of the top cover structure of the square shell battery, the top cover sheet 1 is a rectangular sheet structure.

[0046] In a preferred embodiment of the top cover structure of the square shell battery, the metal protection ring 3 is a cylindrical structure.

[0047] In a preferred embodiment of the top cover structure of the square shell battery, the height of the pole metal piece 5 is flush with the top of the metal protective ring 3.

[0048] In a preferred embodiment of the top cover structure of the square shell battery, the height of the pole plastic part 4 is higher than the height of the pole metal part 5 .

[0049] In a preferred embodiment of the top cover structure of the square shell battery, the top cover sheet 1 is provided with an annular groove.

[0050] In a preferred embodiment of the top cover structure of the square shell battery, the metal protective ring 3 is embedded in the annular groove.

[0051] In a preferred embodiment of the top cover structure of the square shell battery, the metal protection ring 3, the pole metal part 5 and the pole plastic part 4 are quadrilateral structures.

[0052] In one embodiment, the top cover structure of the square shell battery is formed by adding a metal protective ring 3 on the top cover sheet 1 and outside the pole plastic part 4. The metal protective ring 3 is integrally formed with the top cover sheet 1. After the pole metal part 5 and the pole plastic part 4 are assembled, the pole plastic part 4 can be surrounded by the metal protective structure; during the welding process, even if laser reflection occurs, the reflected laser will first hit the metal layer to isolate the impact on the plastic part and the sealing ring. In addition, only the flange edge 2 is added next to the pole on the top cover. When the top cover is put into the shell, due to the limiting effect of the flange, the top cover will no longer sink into the shell mouth, thus avoiding the generation of negative steps. Here, only the flange edge 2 is added around the pole, and the flange edge 2 is not added to the middle of the top cover, which is conducive to saving materials and improving the production yield of the top cover.

[0053] Furthermore, the metal protection ring 3 uses the top cover sheet 1 as a carrier, and is not limited to the method of welding or die-casting as an integral molding, so that the metal protection ring 3 is fixed on the top cover sheet 1 to play a role in assembling and positioning the pole.

[0054] Furthermore, due to the presence of the metal protection ring 3, the reflection of the welding laser can be blocked, thereby preventing the laser from burning the plastic structure of the pole.

[0055] Furthermore, when the top cover is assembled, due to the presence of the C-shaped flange 2, when the top cover is assembled and pressed down, the shell mouth height will be limited by the flange and will not exceed the upper surface of the top cover, thereby fundamentally avoiding the possibility of negative step reflection welding laser.

[0056] Furthermore, due to the presence of the C-shaped flange edge 2, the overpressure of the tooling robot on the top cover during the shell insertion process is limited, the frequency of steps can be reduced, and the shell insertion yield rate can be effectively improved.

[0057] In one embodiment, a fully surrounding flange 2 is added around the long and short sides of the top cover sheet 1 to prevent the occurrence of negative steps.

[0058] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0059] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A top cover structure of a square shell battery, characterized in that: These include, a top cover sheet having a horizontal upper surface; A flange edge, which is at least partially arranged around the top cover sheet and is flush with the upper surface of the top cover sheet; a metal protective ring vertically fixed on the upper surface; A plastic pole part, which is installed in the metal protective ring; The pole metal piece surrounds the pole plastic piece and is located between the pole plastic piece and the metal protection ring.

2. The top cover structure of a square shell battery according to claim 1, characterized in that: The flange edge is a C-shaped structure that partially surrounds the top cover sheet.

3. The top cover structure of a square shell battery according to claim 1, characterized in that: The flange edge is an annular structure that completely surrounds the top cover sheet.

4. The top cover structure of a square shell battery according to claim 1, characterized in that: The top cover sheet is a rectangular sheet structure.

5. The top cover structure of a square shell battery according to claim 1, characterized in that: The metal protection ring is a cylindrical structure.

6. The top cover structure of a square shell battery according to claim 1, characterized in that: The height of the pole metal part is flush with the top of the metal protective ring.

7. A top cover structure of a square shell battery according to claim 6, characterized in that: The height of the pole plastic part is higher than that of the pole metal part.

8. The top cover structure of a square shell battery according to claim 1, characterized in that: The top cover sheet is provided with an annular groove.

9. A top cover structure of a square shell battery according to claim 8, characterized in that: The metal protection ring is embedded in the annular groove.

10. The top cover structure of a square shell battery according to claim 1, characterized in that: The metal protection ring, the pole metal part and the pole plastic part are quadrilateral structures.

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