A battery cover plate assembly, assembling method and battery

Abstract

The present application belongs to the technical field of battery, and particularly relates to a battery cover plate assembly, an assembling method and a battery. The battery cover plate assembly comprises a light cover plate, a modular terminal and a lower plastic. The light cover plate is provided with an assembly groove, and the modular terminal is arranged in the assembly groove. The assembly groove is a stepped structure, comprising a first stepped surface and a second stepped surface arranged in sequence from top to bottom. The modular terminal comprises a conductive column, and a sealing ring and an inner welding ring are arranged in sequence below the conductive column. The inner welding ring is embedded on the second stepped surface of the assembly groove. An outer welding ring is arranged above the conductive column, and the outer welding ring covers the first stepped surface of the assembly groove. The conductive column and the outer welding ring are filled with upper plastic. The terminal is modularly designed, so that it can be adapted to different sizes of battery cells, and the development cost of the terminal and the assembly cost of the cover plate assembly are reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a battery cover plate assembly, an assembling method and a battery. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] New energy is developing rapidly, and power batteries are being applied more and more widely. As an important component of a battery, a battery structural part plays a crucial role in the safety, weight and space utilization of the battery.

[0004] In recent years, in order to meet the needs of customers, lightweighting, simplification and modularization of batteries have become important directions for the development of battery structural parts. As the most important part of a battery structural part, the existing cover plate assembly has a low modularization rate, which increases the development cost, verification cost and mold clamp cost of the structural part, and is not conducive to the realization of the ultimate cost of the battery cell. SUMMARY

[0005] To overcome the above-mentioned deficiencies of the prior art, the present application provides a battery cover plate assembly, an assembling method and a battery.

[0006] To achieve the above-mentioned purpose, one or more embodiments of the present application provide the following technical solutions:

[0007] The first aspect of the present application provides a battery cover plate assembly, comprising a light cover plate, a modularized terminal and a lower plastic;

[0008] The light cover plate is provided with an assembly groove, and the modularized terminal is arranged in the assembly groove. The assembly groove is a stepped structure comprising a first stepped surface and a second stepped surface arranged in sequence from top to bottom.

[0009] The modularized terminal comprises a conductive column, and a sealing ring and an inner welding ring are arranged in sequence below the conductive column. The inner welding ring is embedded on the second stepped surface of the assembly groove.

[0010] An outer welding ring is arranged above the conductive column, and the outer welding ring covers the first stepped surface of the assembly groove. An upper plastic is injection molded between the conductive column and the outer welding ring.

[0011] The second aspect of the present application provides an assembling method of a battery cover plate assembly, based on the battery cover plate assembly provided in the first aspect of the present application, comprising:

[0012] Place the sealing ring between the conductive post and the inner welding ring, and use a clamp to clamp and fix the conductive post, the negative electrode sealing ring, and the inner welding ring, so that the sealing ring is compressed; cover the conductive post with the outer welding ring, and inject plastic into the gap between the conductive post and the outer welding ring; so that the conductive post, sealing ring, inner welding ring, outer welding ring, and plastic are assembled into a modular terminal.

[0013] The modular terminal is assembled into the mounting groove on the cover plate, so that the inner welding ring is fitted onto the second step surface of the mounting groove on the cover plate, and the outer welding ring is fitted onto the first step surface of the mounting groove on the cover plate.

[0014] Laser welding is performed in the contact area between the inner welding ring and the second stepped surface of the assembly groove, and laser welding is performed in the contact area between the outer welding ring and the first stepped surface of the assembly groove.

[0015] A third aspect of the present invention provides a battery, including a battery casing, an electrode core disposed within the battery casing, and a battery cover assembly provided in the first aspect of the present invention, wherein one end of the battery casing has an opening, and the battery cover assembly is encapsulated on the opening.

[0016] The above one or more technical solutions have the following beneficial effects:

[0017] (1) This invention uses a modular design for the terminals, which can be proportionally reduced or increased in size to accommodate cells of different thicknesses, thus adapting to cells of different sizes. Furthermore, a terminal of the same size can be used for a certain range of cell thicknesses without requiring redevelopment. This reduces the development cost of the terminals and the assembly cost of the cover plate assembly.

[0018] (2) In this invention, the inner welding ring and the outer welding ring are laser welded to the cover plate respectively, thereby connecting and fixing the modular terminal to the cover plate through two laser weldings, and sealing through two laser weldings, thus ensuring the structural strength and sealing performance of the pole.

[0019] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is an overall structural diagram of a battery cover assembly according to Embodiment 1;

[0022] Figure 2This is an exploded view of a battery cover assembly according to Embodiment 1;

[0023] Figure 3 This is a cross-sectional view of a battery cover assembly according to Embodiment 1;

[0024] Figure 4 This is a cross-sectional view of the negative terminal of Example 1;

[0025] Figure 5 This is a schematic diagram of the light cover plate in Example 1;

[0026] Figure 6 This is a schematic diagram of the solder joint of the negative terminal in Example 2.

[0027] In the diagram, 1. Battery cover assembly, 10. Negative electrode post, 20. Positive electrode post, 30. Plain cover, 40. Lower plastic, 101. Negative electrode outer welding ring, 102. Negative electrode upper plastic, 103. Negative electrode conductive terminal, 104. Negative electrode sealing ring, 105. Negative electrode inner welding ring, 106. Negative electrode sealing ring expansion area, 107. Negative electrode sealing ring compression area, 1031. Negative electrode conductive aluminum post, 1032. Negative electrode conductive copper post, 201. Positive electrode outer welding ring, 202. Positive electrode upper plastic, 203. Positive electrode conductive terminal, 204. Positive electrode sealing ring, 205. Positive electrode inner welding ring, 301. Assembly groove, 3011. First step surface, 3012. Second step surface. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, this invention proposes a battery cover assembly, including a smooth cover plate 30, a positive modular terminal 20, a negative modular terminal 10, and a lower plastic 40. The smooth cover plate 30 has an assembly groove 301, and the modular terminals are disposed within the assembly groove 301; as shown... Figure 5 As shown, the assembly groove 301 has a stepped structure, including a first stepped surface 3011 and a second stepped surface 3012 arranged sequentially from top to bottom;

[0031] The modular terminal includes a negative terminal 10 and a positive terminal 20, which are respectively disposed at both ends of the light cover plate 30. The negative terminal 10 and the positive terminal 20 have the same structure, the difference being that the conductive post is made of different materials.

[0032] like Figure 2 As shown, the negative terminal 10 includes an outer negative electrode welding ring 101, an upper negative electrode plastic 102, a negative electrode conductive post 103, a negative electrode sealing ring 104, and an inner negative electrode welding ring 105.

[0033] The positive terminal 20 includes an outer positive electrode welding ring 201, an upper positive electrode plastic 202, a positive electrode conductive post 203, a positive electrode sealing ring 204, and an inner positive electrode welding ring 205.

[0034] like Figure 3 , Figure 4 As shown, a negative electrode sealing ring 104 and a negative electrode inner welding ring 105 are sequentially arranged below the negative electrode conductive post 103. The negative electrode inner welding ring 105 is fitted onto the second stepped surface 3012 of the assembly groove 301. A negative electrode outer welding ring 101 is arranged above the negative electrode conductive post 103. The negative electrode outer welding ring 101 covers the first stepped surface 3011 of the assembly groove 301. A negative electrode upper plastic 102 is injection molded between the negative electrode conductive post 103 and the negative electrode outer welding ring 101.

[0035] Below the positive electrode conductive post 203, there is a positive electrode sealing ring 204 and a positive electrode inner welding ring 205 arranged sequentially. The positive electrode inner welding ring 205 is fitted into the second stepped surface of the assembly groove 301. Above the positive electrode conductive post 203, there is a positive electrode outer welding ring 201, which covers the first stepped surface of the assembly groove 301. A positive electrode upper plastic 202 is injection molded between the positive electrode conductive post 203 and the positive electrode outer welding ring 201.

[0036] The outer positive electrode welding ring 201 is insulated from the positive electrode conductive post 203 by the upper positive electrode plastic 202. The inner positive electrode welding ring 205 is insulated from the positive electrode conductive post 203 by the positive electrode sealing ring 204 and the upper positive electrode plastic 202, and the sealing performance is achieved by the positive electrode sealing ring 204. The plastic 40 under the cover plate is provided with a buckle, which is fastened and fixed to the inner positive electrode welding ring 205 and compressed into contact with the positive electrode sealing ring 204 to prevent electrolyte from seeping between the positive electrode conductive post 203 and the inner positive electrode welding ring 205, causing high voltage defects in the casing.

[0037] The outer welding ring 101 of the negative electrode is insulated from the negative electrode conductive post 103 by the plastic 102 on the negative electrode. The inner welding ring 105 of the negative electrode is insulated from the negative electrode conductive post 103 by the negative electrode sealing ring 104 and the plastic 102 on the negative electrode, and the sealing performance is achieved by the negative electrode sealing ring 104. The plastic 40 under the cover plate is provided with a buckle, which is fastened and fixed to the inner welding ring 105 of the negative electrode, and the inner welding ring 105 of the negative electrode is in compression contact with the negative electrode sealing ring 104 to prevent electrolyte from seeping into the space between the negative electrode conductive post 103 and the inner welding ring 105 of the negative electrode, which would cause poor low voltage in the casing.

[0038] As a further implementation, the bottom surface of the positive / negative conductive post is tightly fitted with the sealing ring.

[0039] As a further embodiment, the top surface of the conductive post is coaxially provided with a first circular protrusion and a second circular protrusion, the diameter of the first circular protrusion being smaller than the diameter of the second circular protrusion.

[0040] As a further embodiment, the positive electrode conductive post 203 is made of aluminum and is formed from an aluminum plate. The negative electrode conductive post 103 includes a negative electrode conductive aluminum post 1031 and a negative electrode conductive copper post 1032, which are integrally formed from a copper-aluminum composite plate.

[0041] Taking the negative terminal as an example, the processing method involves fixing the negative conductive post 103, the negative sealing ring 104, and the negative inner welding ring 105 with a clamp to ensure the compression of the sealing ring. Then, the negative outer welding ring 101 is fixed in the corresponding position, followed by injection molding of the plastic 102 on the negative terminal to completely fill the gaps between the negative conductive post 103, the negative outer welding ring 101, the negative sealing ring 104, and the negative inner welding ring 105. This fixes and insulates all metal parts. Thus, the negative conductive terminal processing is completed. This is a modular unit that can be mass-produced individually. Later, depending on the cover width, it can be adapted to different battery cells and can accommodate a certain battery cell thickness.

[0042] Example 2

[0043] This embodiment proposes an assembly method for a battery cover assembly, based on the battery cover assembly disclosed in Embodiment 1, comprising:

[0044] Place the sealing ring between the conductive post and the inner welding ring, and use a clamp to clamp and fix the conductive post, the negative electrode sealing ring, and the inner welding ring, so that the sealing ring is compressed; cover the outer welding ring on the fixed position around the conductive post, and inject plastic into the gap between the conductive post and the outer welding ring; so that the conductive post, sealing ring, inner welding ring, outer welding ring, and plastic are assembled into a modular terminal.

[0045] The modular terminal is assembled into the mounting groove on the cover plate, so that the inner welding ring is fitted onto the second step surface of the mounting groove on the cover plate, and the outer welding ring is fitted onto the first step surface of the mounting groove on the cover plate.

[0046] Laser welding is performed in the contact area between the inner welding ring and the second stepped surface of the assembly groove, and laser welding is performed in the contact area between the outer welding ring and the first stepped surface of the assembly groove.

[0047] like Figure 6 As shown, the modular terminal and the light cover plate are connected by two laser welding processes. The outer welding ring 101 of the modular terminal is fitted with the assembly groove of the light cover plate 30, and then pressed by tooling. External laser welding is performed at the overlap joint between the outer welding ring and the light cover plate, and internal laser welding is performed at the overlap joint between the inner welding ring and the light cover plate. Thus, the modular terminal and the light cover plate are fixed and sealed by laser welding.

[0048] Two laser welding processes ensure the strength and sealing performance of the cover plate. The positive electrode post is installed in the same way. The expansion material in the compression area 107 of the sealing ring 104 is squeezed into the expansion area 106. After the injection molding of the upper plastic 102, the upper plastic fills the remaining expansion area and integrates with the sealing ring, ensuring that all gaps between the metals are filled and preventing electrolyte seepage that could cause poor casing voltage.

[0049] Example 3

[0050] This embodiment proposes a battery, including a battery casing, a battery cell disposed within the battery casing, and a battery cover assembly disclosed in Embodiment 1. One end of the battery casing has an opening, and the battery cover assembly is encapsulated on the opening.

[0051] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A battery cover assembly, characterized in that, Includes cover plate, modular terminals and lower plastic; The light cover plate is provided with an assembly groove, and the modular terminal is disposed in the assembly groove; the assembly groove has a stepped structure, including a first stepped surface and a second stepped surface arranged sequentially from top to bottom; The modular terminal includes a conductive post, and a sealing ring and an inner welding ring are arranged in sequence below the conductive post. The inner welding ring is fitted into the second stepped surface of the assembly groove. An outer welding ring is provided above the conductive post, and the outer welding ring covers the first stepped surface of the assembly groove. An upper plastic is injected between the conductive post and the outer welding ring. The top surface of the conductive post has a first circular protrusion and a second circular protrusion coaxially provided, the diameter of the first circular protrusion being smaller than the diameter of the second circular protrusion; the conductive post includes a positive conductive post and a negative conductive post, the positive and negative conductive posts having the same structure and being respectively disposed at both ends of the cover plate; the positive conductive post is made of aluminum and is formed by processing aluminum plate; the negative conductive post is made of aluminum on top and copper on the bottom and is formed by processing copper-aluminum composite plate.

2. The battery cover assembly according to claim 1, characterized in that, The bottom surface of the conductive post is in close contact with the sealing ring.

3. The battery cover assembly according to claim 1, characterized in that, The cover plate has a plastic cover underneath.

4. A battery cover assembly according to claim 3, characterized in that, The plastic under the cover plate is provided with a buckle for fastening and fixing to the inner welded ring.

5. A method for assembling a battery cover assembly, based on the battery cover assembly according to any one of claims 1-4, characterized in that, include: Place the sealing ring between the conductive post and the inner welding ring, and use a clamp to clamp and fix the conductive post, the negative electrode sealing ring, and the inner welding ring, so that the sealing ring is compressed; cover the conductive post with the outer welding ring, and inject plastic into the gap between the conductive post and the outer welding ring; so that the conductive post, sealing ring, inner welding ring, outer welding ring, and plastic are assembled into a modular terminal. The modular terminal is assembled into the mounting groove on the cover plate, so that the inner welding ring is fitted onto the second step surface of the mounting groove on the cover plate, and the outer welding ring is fitted onto the first step surface of the mounting groove on the cover plate. Laser welding is performed in the contact area between the inner welding ring and the second stepped surface of the assembly groove, and laser welding is performed in the contact area between the outer welding ring and the first stepped surface of the assembly groove.

6. A battery, characterized in that, The battery includes a battery housing, an electrode core disposed within the battery housing, and a battery cover assembly as described in any one of claims 1-4, wherein one end of the battery housing has an opening, and the battery cover assembly is encapsulated over the opening.

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