Battery cover plate assembly, assembling method and battery

Abstract

The invention belongs to the technical field of batteries, 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 lower plastic; the light cover plate is provided with an assembly groove, and the modular terminal is arranged in the assembly groove. The assembling groove is of a step structure and comprises a first step face and a second step face which are sequentially arranged from top to bottom. The modular terminal comprises a conductive column, a sealing ring and an inner welding ring are sequentially arranged below the conductive column, and the inner welding ring is embedded in the second step surface of the assembly groove; an outer welding ring is arranged above the conductive column, the outer welding ring covers the first step face of the assembling groove, and upper plastic is arranged between the conductive column and the outer welding ring in an injection molding mode. According to the cover plate assembly, the terminals are modularly designed, so that the terminals can be adapted to the battery cells with different sizes, and the development cost of the terminals and the assembly cost of the cover plate assembly are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a battery cover assembly, an assembly method and a battery. Background Art

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

[0003] With the rapid development of new energy, power batteries are being used more and more widely. Battery structural parts, as an important component of batteries, play a vital role in battery safety, weight and space utilization.

[0004] In recent years, in order to meet customer needs, lightweight, extremely simple and modularized batteries have become important development directions for battery structural parts. However, as the most important part of battery structural parts, the cover assembly has a low modularization rate, which invisibly increases the development cost, verification cost and mold and fixture cost of the structural parts, which is not conducive to achieving the ultimate cost of the battery cell. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a battery cover assembly, an assembly method and a battery.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] A first aspect of the present invention provides a battery cover assembly, including a light cover, a modular terminal and a lower plastic;

[0008] The optical 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, including a first step surface and a second step surface arranged in sequence from top to bottom;

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

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

[0011] A second aspect of the present invention provides an assembly method of a battery cover assembly, based on the battery cover assembly provided by the first aspect of the present invention, comprising:

[0012] The sealing ring is placed between the conductive column and the inner welding ring, and the conductive column, the negative electrode sealing ring and the inner welding ring are clamped and fixed by a clamp, so that the sealing ring is compressed; the outer welding ring is covered on the conductive column, and the upper plastic is injected into the gap between the conductive column and the outer welding ring; the conductive column, the sealing ring, the inner welding ring, the outer welding ring and the upper plastic are assembled into a modular terminal;

[0013] Assemble the modular terminal into the assembly groove on the light cover plate so that the inner welding ring covers the second step surface of the assembly groove on the light cover plate, and the outer welding ring covers the first step surface of the assembly groove on the light cover plate;

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

[0015] The third aspect of the present invention provides a battery, comprising a battery shell, a pole core arranged in the battery shell, and the battery cover assembly provided by the first aspect of the present invention, wherein an opening is provided at one end of the battery shell, and the battery cover assembly is encapsulated on the opening.

[0016] One or more of the above technical solutions have the following beneficial effects:

[0017] (1) The present invention uses modular design for the terminal, so that the terminal can be reduced or enlarged in the same proportion and used for battery cells of different thicknesses, so that it can be adapted to battery cells of different sizes, and the same size of terminal can be used for a certain range of battery cell thicknesses without the need for redevelopment. This reduces the development cost of the terminal and the assembly cost of the cover assembly.

[0018] (2) The present invention laser welds the inner welding ring and the outer welding ring to the cover plate respectively, so that the modular terminal is connected and fixed to the cover plate through two laser welding steps, and is sealed through two laser welding steps, thereby ensuring the structural strength and sealing performance of the pole.

[0019] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

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

[0022] Figure 2An exploded view of a battery cover assembly of Example 1;

[0023] Figure 3 is a cross-sectional view of a battery cover assembly of Example 1;

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

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

[0026] Figure 6 Schematic diagram of the welding point of the negative terminal of Example 2.

[0027] In the figure, 1. battery cover assembly, 10. negative pole, 20. positive pole, 30. bare cover, 40. lower plastic, 101. negative pole outer welding ring, 102. negative pole upper plastic, 103. negative pole conductive terminal, 104. negative pole sealing ring, 105. negative pole inner welding ring, 106. negative pole sealing ring expansion area, 107. negative pole sealing ring compression area, 1031. negative pole conductive aluminum column, 1032. negative pole conductive copper column, 201. positive pole outer welding ring, 202. positive pole upper plastic, 203. positive pole conductive terminal, 204. positive pole sealing ring, 205. positive pole inner welding ring, 301. assembly groove, 3011. first step surface, 3012. second step surface. DETAILED DESCRIPTION

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

[0029] Embodiment 1

[0030] like Figure 1 As shown, the present invention provides a battery cover assembly, including a light cover 30, a positive modular terminal 20, a negative modular terminal 10, and a lower plastic 40. The light cover 30 is provided with an assembly groove 301, and the modular terminal is arranged in the assembly groove 301; Figure 5 As shown, the assembly groove 301 is a stepped structure, including a first step surface 3011 and a second step 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 arranged at two ends of the optical cover plate 30. The negative terminal 10 and the positive terminal 20 have the same structure, and the difference lies in the different materials of the conductive column.

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

[0033] The positive terminal 20 includes a positive outer welding ring 201 , a positive upper plastic 202 , a positive conductive column 203 , a positive sealing ring 204 , and a positive inner 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 column 103, and the negative electrode inner welding ring 105 is embedded in the second step surface 3012 of the assembly groove 301; a negative electrode outer welding ring 101 is arranged above the negative electrode conductive column 103, and the negative electrode outer welding ring 101 covers the first step surface 3011 of the assembly groove 301, and a negative electrode upper plastic 102 is injection-molded between the negative electrode conductive column 103 and the negative electrode outer welding ring 101.

[0035] A positive sealing ring 204 and a positive inner welding ring 205 are provided in sequence below the positive conductive column 203, and the positive inner welding ring 205 is embedded in the second step surface of the assembly groove 301; a positive outer welding ring 201 is provided above the positive conductive column 203, and the positive outer welding ring 201 covers the first step surface of the assembly groove 301, and a positive upper plastic 202 is injection-molded between the positive conductive column 203 and the positive outer welding ring 201.

[0036] The positive electrode outer welding ring 201 and the positive electrode conductive column 203 are insulated by the positive electrode upper plastic 202, and the positive electrode inner welding ring 205 and the positive electrode conductive column 203 are insulated by the positive electrode sealing ring 204 and the positive electrode upper 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 buckled and fixed with the positive electrode inner welding ring 205, and is in compression contact with the positive electrode sealing ring 204 to prevent the electrolyte from penetrating between the positive electrode conductive column 203 and the positive electrode inner welding ring 205, causing the high voltage of the shell.

[0037] The negative electrode outer welding ring 101 and the negative electrode conductive column 103 are insulated by the negative electrode upper plastic 102, and the negative electrode inner welding ring 105 and the negative electrode conductive column 103 are insulated by the negative electrode sealing ring 104 and the negative electrode upper plastic 102, 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 buckled and fixed with the negative electrode inner welding ring 105, and the negative electrode inner welding ring 105 is in compression contact with the negative electrode sealing ring 104 to prevent the electrolyte from penetrating between the negative electrode conductive column 103 and the negative electrode inner welding ring 105, causing the low voltage of the shell.

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

[0039] As a further embodiment, a first circular protrusion and a second circular protrusion are coaxially disposed on the top surface of the conductive column, and a diameter of the first circular protrusion is smaller than a diameter of the second circular protrusion.

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

[0041] Taking the negative pole as an example, the processing method is to fix the negative pole conductive pole 103, the negative pole sealing ring 104, and the negative pole inner welding ring 105 with a clamp to ensure the compression of the sealing ring, and then fix the negative pole outer welding ring 101 to the corresponding position, and then perform injection molding of the plastic 102 on the negative pole, and completely fill the gaps between the negative pole conductive pole 103, the negative pole outer welding ring 101, the negative pole sealing ring 104, and the negative pole inner welding ring 105, and fix and insulate and seal each metal part. Thus, the processing of the negative pole conductive terminal is completed, which is a modularized whole that can be produced separately in large quantities, and then adapted to different battery cells according to the width of the cover plate, and can be compatible with a certain battery cell thickness.

[0042] Embodiment 2

[0043] This embodiment provides a method for assembling a battery cover assembly, based on the battery cover assembly disclosed in the first embodiment, comprising:

[0044] The sealing ring is placed between the conductive column and the inner welding ring, and the conductive column, the negative electrode sealing ring and the inner welding ring are clamped and fixed by a clamp, so that the sealing ring is compressed; the outer welding ring is covered on the outer fixed position of the conductive column, and the upper plastic is injected into the gap between the conductive column and the outer welding ring; the conductive column, the sealing ring, the inner welding ring, the outer welding ring and the upper plastic are assembled into a modular terminal;

[0045] Assemble the modular terminal into the assembly groove on the light cover plate so that the inner welding ring covers the second step surface of the assembly groove on the light cover plate, and the outer welding ring covers the first step surface of the assembly groove on the light cover plate;

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

[0047] like Figure 6 As shown, the modular terminal and the optical cover are connected by two laser weldings. The outer welding ring 101 of the modular terminal is matched with the assembly groove of the optical cover 30, and then pressed by the tooling. External laser welding is performed at the overlap seam between the outer welding ring and the optical cover, and internal laser welding is performed at the overlap seam between the inner welding ring and the optical cover. At this point, the modular terminal and the optical cover are fixed and sealed by laser welding.

[0048] Two laser weldings ensure the strength and sealing performance of the cover. The positive pole is installed in the same way. The expanded material in the compression area 107 of the sealing ring 104 is squeezed to the expanded material area 106, and then the upper plastic 102 is injected. The upper plastic fills the remaining area of ​​the expanded material and integrates with the sealing ring, ensuring that the gaps between the metals are completely filled, and there will be no poor shell voltage caused by electrolyte infiltration.

[0049] Embodiment 3

[0050] This embodiment provides a battery, including a battery housing, a battery cell disposed in the battery housing, and the battery cover assembly disclosed in the first embodiment. An opening is provided at one end of the battery housing, and the battery cover assembly is packaged on the opening.

[0051] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it 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 on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A battery cover assembly, characterized in that: Including light cover, modular terminals and lower plastic; The optical 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, including a first step surface and a second step surface arranged in sequence from top to bottom; The modular terminal comprises a conductive column, a sealing ring and an inner welding ring are arranged in sequence below the conductive column, and the inner welding ring is embedded in the second step surface of the assembly groove; An outer welding ring is arranged above the conductive column, and the outer welding ring covers the first step surface of the assembly groove, and upper plastic is injection-molded between the conductive column and the outer welding ring.

2. A battery cover assembly according to claim 1, characterized in that: The bottom surface of the conductive column is tightly fitted with the sealing ring.

3. A battery cover assembly according to claim 1, characterized in that: A first circular protrusion and a second circular protrusion are coaxially disposed on the top surface of the conductive column, and a diameter of the first circular protrusion is smaller than a diameter of the second circular protrusion.

4. A battery cover assembly according to claim 1, characterized in that: The conductive posts include a positive conductive post and a negative conductive post. The positive conductive post and the negative conductive post have the same structure and are respectively arranged at two ends of the optical cover plate.

5. A battery cover assembly according to claim 4, characterized in that: The positive electrode conductive column is made of aluminum and is formed by processing an aluminum plate.

6. A battery cover assembly according to claim 4, characterized in that: The upper part of the negative electrode conductive column is made of aluminum, and the lower part is made of copper, and is formed by processing a copper-aluminum composite plate.

7. A battery cover assembly according to claim 1, characterized in that: A lower cover plate plastic is provided below the optical cover plate.

8. A battery cover assembly according to claim 7, characterized in that: A buckle is provided on the lower plastic of the light cover plate, which is used to buckle and fix with the inner welding ring.

9. A method for assembling a battery cover assembly, based on the battery cover assembly according to any one of claims 1 to 8, characterized in that: include: The sealing ring is placed between the conductive column and the inner welding ring, and the conductive column, the negative electrode sealing ring and the inner welding ring are clamped and fixed by a clamp, so that the sealing ring is compressed; the outer welding ring is covered on the conductive column, and the upper plastic is injected into the gap between the conductive column and the outer welding ring; the conductive column, the sealing ring, the inner welding ring, the outer welding ring and the upper plastic are assembled into a modular terminal; Assemble the modular terminal into the assembly groove on the light cover plate so that the inner welding ring covers the second step surface of the assembly groove on the light cover plate, and the outer welding ring covers the first step surface of the assembly groove on the light cover plate; Laser welding is performed at a contact area between the inner welding ring and the second step surface of the assembly groove, and laser welding is performed at a contact area between the outer welding ring and the first step surface of the assembly groove.

10. A battery, characterized in that: It comprises a battery shell, a pole core arranged in the battery shell and a battery cover assembly as claimed in any one of claims 1 to 8, wherein one end of the battery shell is provided with an opening, and the battery cover assembly is encapsulated on the opening.

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