Shell assembly and battery

Abstract

The shell assembly comprises a conductive shell and a cover plate, the conductive shell is rectangular, the conductive shell comprises side walls, the side walls define a containing cavity for containing a battery cell, the containing cavity is provided with an opening, and the side walls are provided with first through holes; the cover plate is connected to the conductive shell and covers the opening; the cathode piece is welded on the outer wall of the conductive shell or the cover plate; the positive pole piece comprises a plate body part and a column body part, the column body part penetrates through the first through hole, and the plate body part is located inside or outside the conductive shell; and the plate body part is in hot melting connection with the side wall through the insulating sheet. The utility model also discloses a battery. According to the utility model, the battery structure is simpler, and the sealing performance of the whole battery structure is also effectively improved.

Description

Technical Field

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

[0002] With the continuous development of small portable electronic devices, the battery components that power these devices have also become increasingly miniaturized, leading to the emergence of small button batteries. Button batteries offer high energy density, good storage performance, low self-discharge, and long life. Traditional button batteries generally have positive and negative electrodes on the battery housing. The positive electrode is typically riveted to the housing, and insulating members are provided on both the inside and outside of the housing to isolate the positive electrode from the housing. This type of battery has a complex structure and is difficult to process. Furthermore, gaps are likely to exist between the insulating sheet and the positive electrode, reducing the sealing performance of the entire battery. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the battery structure is complex and it is difficult to ensure the sealing performance.

[0004] In order to solve the above technical problems, the utility model provides a housing assembly, comprising:

[0005] A conductive shell, the conductive shell is rectangular and includes side walls, the side walls enclosing a receiving cavity for accommodating the battery cell, the receiving cavity having an opening, and a first through hole is provided on the side walls;

[0006] a cover plate connected to the conductive shell and covering the opening;

[0007] A negative electrode member welded to the outer wall of the conductive shell or cover plate;

[0008] a positive electrode member, the positive electrode member comprising a plate portion and a column portion, the column portion passing through the first through hole, and the plate portion being located inside or outside the conductive shell;

[0009] Insulating sheet, the plate body is connected to the side wall by thermal melting through the insulating sheet.

[0010] In one embodiment of the present invention, the insulating sheet is located between the plate body and the side wall, the insulating sheet is provided with a mounting hole, and the column portion passes through the mounting hole and the first through hole in sequence.

[0011] In one embodiment of the present invention, an explosion-proof valve is connected to the cover plate.

[0012] In one embodiment of the present invention, the negative electrode member is made of nickel sheet, the side wall and the cover plate are both made of steel plate, and the negative electrode member is welded to the outer wall of the side wall or the cover plate.

[0013] In one embodiment of the present invention, the column portion is located in the middle of the plate portion, the plate portion and the column portion are both circular, and the outer diameter of the column portion is smaller than the outer diameter of the plate portion.

[0014] In one embodiment of the present invention, the thickness of the side wall is 30-200 μm.

[0015] In one embodiment of the present invention, the thickness of the cover plate is not greater than the thickness of the side wall.

[0016] In one embodiment of the present invention, a second through hole is further provided on the side wall, and a liquid blocking plug is connected to the second through hole.

[0017] In one embodiment of the present invention, the middle portion of the liquid blocking plug is recessed inward to form a convex portion, and the convex portion is inserted into the second through hole.

[0018] A battery comprises a battery cell and a shell assembly as described above, wherein the battery cell is located in the accommodating cavity, the positive electrode of the battery cell is electrically connected to the positive electrode member, and the negative electrode of the battery cell is electrically connected to the negative electrode member.

[0019] In one embodiment of the present invention, the battery cell is rectangular.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] The housing assembly and battery described in the present invention make the battery structure simpler and effectively improve the sealing performance of the entire battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of a battery structure according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A top view of the battery structure shown;

[0025] Figure 3 yes Figure 2 a right side view of the battery structure shown;

[0026] Figure 4 yes Figure 2 Cross-sectional view at AA in the middle;

[0027] Figure 5 yes Figure 1 An exploded view of the battery structure shown;

[0028] Figure 6 This is a structural diagram of the liquid blocking plug from one angle;

[0029] Figure 7 This is a structural diagram of the liquid blocking plug from another angle;

[0030] Figure 8 yes Figure 1 The schematic diagram of the battery structure shown is a structural diagram after removing the cover plate and battery cells;

[0031] Figure 9 yes Figure 8 a schematic diagram of another angle of the structure shown;

[0032] Figure 10 is a schematic diagram of a battery structure of another embodiment of the present utility model;

[0033] Figure 11 yes Figure 10 A top view of the battery structure shown;

[0034] Figure 12 yes Figure 11 a right side view of the battery structure shown;

[0035] Figure 13 yes Figure 11 Cross-sectional view at the middle BB;

[0036] Figure 14 yes Figure 10 An exploded view of the battery structure shown;

[0037] Figure 15 yes Figure 10 The schematic diagram of the battery structure shown is a structural diagram after removing the cover plate and battery cells;

[0038] Figure 16 yes Figure 15 a schematic diagram of another angle of the structure shown;

[0039] Description of the accompanying drawings:

[0040] 10. Conductive shell; 101. Side wall; 1011. First through hole; 1012. Second through hole; 102. Accommodating cavity; 103. Opening;

[0041] 20. Cover plate;

[0042] 30. Negative electrode;

[0043] 40. positive electrode; 401. plate portion; 402. column portion;

[0044] 50. Insulation sheet; 501. Mounting hole;

[0045] 60. Liquid blocking plug; 601. Raised portion;

[0046] 70. Battery cell. DETAILED DESCRIPTION

[0047] The present invention is further described below with reference to the accompanying drawings and specific embodiments to enable those skilled in the art to better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. It is apparent that the embodiments described are only some of the embodiments of the present disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present disclosure, its application, or use.

[0048] In the description of the present invention, it should be understood that the terms "vertical", "upper", "lower", "top", "side", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying 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 a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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 invention, unless otherwise specified, "multiple" means two or more.

[0049] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0050] The following will be combined Figures 1-16 , the structure of this embodiment is further described.

[0051] Example 1

[0052] See Figures 1-9 , this embodiment discloses a housing assembly, including a conductive shell 10, a cover plate 20, a negative electrode member 30, a positive electrode member 40 and an insulating sheet 50;

[0053] The conductive shell 10 is rectangular and includes a side wall 101 . The side wall 101 encloses a receiving cavity 102 for accommodating the battery cell 70 . The receiving cavity 102 has an opening 103 . A first through hole 1011 is provided on the side wall 101 .

[0054] The cover plate 20 is connected to the conductive shell 10 and covers the opening 103 to achieve a sealed installation;

[0055] The negative electrode member 30 is welded to the outer wall of the conductive shell 10 or the cover plate 20, and the negative electrode member 30 is used to electrically connect to the negative electrode of the internal battery cell 70;

[0056] The positive electrode member 40 includes a plate portion 401 and a column portion 402. The column portion 402 passes through the first through hole 1011. Figure 8-Figure 9 As shown, the plate body 401 is located outside the conductive shell 10; the positive electrode member 40 is used to electrically connect to the positive electrode of the internal battery cell 70;

[0057] The plate body 401 is connected to the side wall 101 by heat-melting through the insulating sheet 50 , that is, one side of the insulating sheet 50 is connected to the plate body 401 by heat-melting, and the other side is connected to the side wall 101 by heat-melting.

[0058] The insulating sheet 50 is used to insulate and separate the positive electrode member 40 from the conductive shell 10. The conductive shell 10 and the negative electrode member 30 can be used as a whole negative electrode, and the negative electrode of the battery cell 70 can be electrically connected to the negative electrode member 30 through the conductive shell 10.

[0059] During hot melt connection, the insulating sheet 50 is first heated to make it molten and viscous. Then the plate body 401 of the positive electrode 40 is attached to one side of the insulating sheet 50, and the side wall 101 is attached to the other side of the insulating sheet 50. After the insulating sheet 50 in the molten and viscous state is solidified and formed, the hot melt connection is completed between the plate body 401, the insulating sheet 50 and the side wall 101.

[0060] In the above structure, the conductive shell 10 is rectangular, which is more conducive to component positioning and processing, and the plate body 401 is connected to the side wall 101 by hot melt through the insulating sheet 50, instead of being connected by riveting, which simplifies the battery assembly process and makes the battery structure simpler. On the other hand, the plate body 401 is connected to the side wall 101 by the insulating sheet 50 using a hot melt connection structure, which can also effectively eliminate the gap between the plate body 401 and the insulating sheet 50, and between the insulating sheet 50 and the side wall 101, thereby effectively improving the sealing performance of the entire shell.

[0061] The insulating sheet 50 can be made of an insulator made of non-metallic materials. To further ensure the hot-melt effect, the insulating sheet 50 can be made of polypropylene material (PP plastic).

[0062] Specifically, the negative electrode member 30 may be welded to the side wall 101 or the bottom surface of the conductive shell 10 , or may be welded to the cover plate 20 .

[0063] In some embodiments, as Figure 1-Figure 4 As shown, the insulating sheet 50 is located between the plate body 401 and the side wall 101 . The insulating sheet 50 is provided with a mounting hole 501 . The column portion 402 passes through the mounting hole 501 and the first through hole 1011 in sequence to better ensure connection reliability.

[0064] Further, if Figure 5 As shown, the plate body 401 and the insulating sheet 50 are both circular, and the outer diameter of the insulating sheet 50 is larger than the outer diameter of the plate body 401 to better prevent the outer edge of the plate body 401 from contacting the conductive shell 10 and improve the insulation effect;

[0065] It is understandable that the shape of the plate body 401 and the insulating sheet 50 may also be an ellipse or other shapes.

[0066] In some embodiments, an explosion-proof valve (not shown) is connected to the cover plate 20. Figure 1 and Figure 5 As shown, since the positive electrode member 40 is mounted on the side wall 101 of the conductive shell 10 rather than on the cover plate 20, the explosion-proof valve and the positive electrode member 40 are also located on different components, which is more conducive to the layout and processing of the explosion-proof valve.

[0067] Furthermore, the negative electrode member 30 is made of nickel sheet, and the side wall 101 and cover plate 20 are both made of steel sheet. In this case, the conductive shell 10 and cover plate 20 are both conductive members, and together with the negative electrode member 30, they function as the negative electrode. The side wall 101 is made of steel sheet, which is a different material from the negative electrode member 30. This facilitates welding of the negative electrode member 30 and the side wall 101, ensuring a good welding effect. Similarly, if the negative electrode member 30 is welded to the steel cover plate 20, the welding effect can also be well maintained.

[0068] The side wall 101 and the cover plate 20 may be made of stainless steel, and the positive electrode member 40 may be made of aluminum.

[0069] Preferably, the column portion 402 is located in the middle of the plate portion 401, and both the plate portion 401 and the column portion 402 are circular. The outer diameter of the column portion 402 is smaller than the outer diameter of the plate portion 401 to ensure the limiting effect of the plate portion 401, and it is also more conducive to the connection between the plate portion 401 and the insulating sheet 50.

[0070] In some embodiments, the thickness of the side wall 101 is 30-200 μm to ensure structural rigidity while also ensuring that the thickness is not too large so that the battery has sufficient capacity and the battery can be lightweight.

[0071] Furthermore, the thickness of the cover plate 20 is not greater than the thickness of the side wall 101 .

[0072] In some embodiments, the side wall 101 is further provided with a second through hole 1012, to which a liquid blocking plug 60 is connected. The second through hole 1012 is used as a liquid injection hole to facilitate injecting electrolyte into the accommodating cavity 102 through the hole.

[0073] Further, if Figure 6-Figure 7 As shown, the middle portion of the liquid blocking plug 60 is recessed inward to form a raised portion 601 , and the raised portion 601 is inserted into the second through hole 1012 , which can better ensure connection reliability and sealing.

[0074] Preferably, the liquid blocking plug 60 can be made of stainless steel.

[0075] This embodiment also discloses a battery, including a battery cell 70 and the above-mentioned shell assembly, the battery cell 70 is located in the accommodating cavity 102, the positive electrode of the battery cell 70 is electrically connected to the positive electrode member 40, and the negative electrode of the battery cell 70 is electrically connected to the negative electrode member 30.

[0076] If the negative electrode member 30 is connected to the conductive shell 10, the conductive shell 10 and the negative electrode member 30 serve as an integral negative electrode; if the negative electrode member 30 is connected to the conductive cover, the conductive shell 10, the negative electrode member 30 and the cover serve as an integral negative electrode.

[0077] For example, generally, the battery cell 70 has a positive ear and a negative ear. The positive ear serves as the positive electrode of the battery cell 70, and the negative ear serves as the negative electrode of the battery cell 70. When connecting, the positive ear of the battery cell 70 can be connected to one end of the positive electrode member 40 that is inserted deep into the shell, and the negative ear of the battery cell 70 can be connected to the conductive shell 10 or the cover.

[0078] Furthermore, the battery cell 70 is rectangular, which is more conducive to heat dissipation and has a higher energy density, and is also more conducive to stacking.

[0079] Example 2

[0080] See Figures 10-16 The main difference between this embodiment and the first embodiment is that the positive electrode member 40 includes a plate portion 401 and a column portion 402. The plate portion 401 is located inside the conductive shell 10. At this time, the column portion 402 passes outward through the first through hole 1011 and is partially exposed outside the conductive shell 10. The insulating sheet 50 is also located inside the conductive shell 10.

[0081] The housing assembly and battery of the above-mentioned embodiments make the battery structure simpler, simplify the battery assembly process, and effectively improve the sealing performance of the entire battery structure.

[0082] All of the above optional technical solutions can be combined in any way to form optional embodiments of the present invention, that is, any multiple embodiments can be combined to meet the needs of different application scenarios. They are all within the scope of protection of this application and will not be described in detail here.

[0083] It should be noted that the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A housing assembly, characterized in that: include, A conductive shell, the conductive shell is rectangular and includes side walls, the side walls enclosing a receiving cavity for accommodating the battery cell, the receiving cavity having an opening, and a first through hole is provided on the side walls; a cover plate connected to the conductive shell and covering the opening; A negative electrode member welded to the outer wall of the conductive shell or cover plate; a positive electrode member, the positive electrode member comprising a plate portion and a column portion, the column portion passing through the first through hole, and the plate portion being located inside or outside the conductive shell; Insulating sheet, the plate body is connected to the side wall by thermal melting through the insulating sheet.

2. The assembly according to claim 1, characterized in that: The insulating sheet is located between the plate body and the side wall. The insulating sheet is provided with a mounting hole. The column portion passes through the mounting hole and the first through hole in sequence.

3. The housing assembly according to claim 1, wherein: An explosion-proof valve is connected to the cover plate.

4. The housing assembly according to claim 1, wherein: The negative electrode member is made of nickel sheet, the side wall and the cover plate are both made of steel plate, and the negative electrode member is welded to the outer wall of the side wall or the cover plate.

5. The housing assembly according to claim 1, wherein: The column portion is located in the middle of the plate portion. Both the plate portion and the column portion are circular. The outer diameter of the column portion is smaller than the outer diameter of the plate portion.

6. The housing assembly according to claim 1, wherein: The thickness of the side wall is 30 to 200 μm.

7. The housing assembly according to claim 1, wherein: The thickness of the cover plate is no greater than the thickness of the side wall.

8. The housing assembly according to claim 1, wherein: A second through hole is also provided on the side wall, and a liquid blocking plug is connected to the second through hole.

9. The housing assembly according to claim 8, wherein: The middle portion of the liquid blocking plug is recessed inward to form a convex portion, and the convex portion is inserted into the second through hole.

10. A battery, characterized in that: It comprises a battery cell and a shell assembly according to any one of claims 1 to 9, wherein the battery cell is located in the accommodating cavity, the positive electrode of the battery cell is electrically connected to the positive electrode member, and the negative electrode of the battery cell is electrically connected to the negative electrode member.

11. The battery according to claim 10, characterized in that: The battery core is rectangular.

Images