A novel steel shell cylindrical structure battery and its assembly method

Abstract

The present invention discloses a novel steel shell cylindrical structure battery and an assembly method thereof, comprising a steel shell, wherein a battery cell is arranged inside the steel shell, a negative electrode connecting piece is connected to the bottom of the battery cell, and a positive electrode assembly is connected to the top of the battery cell; wherein the positive electrode assembly comprises a positive electrode connecting piece, a positive electrode connecting block is connected to the bottom of the positive electrode connecting piece, an aluminum substrate is arranged on the top of the positive electrode connecting piece, an insulating sealing ring is arranged at the edge of the aluminum substrate, a sealing aluminum cap is connected to the top of the aluminum substrate, a sealing rubber plug is installed in the middle of the positive electrode connecting block, and the sealing rubber plug is located inside the sealing aluminum cap; the above structure is adopted to increase the internal space of the steel shell, and at the same time optimize the structure of the positive electrode, further expand the placement size of the battery cell, and improve the energy density inside the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of cylindrical structure batteries, and in particular to a novel steel shell cylindrical structure battery and an assembly method thereof. Background Art

[0002] Cylindrical batteries have several parts, such as the positive pole, negative pole, battery cell, and shell. Usually, the positive pole or negative pole is a pole riveted structure, and a certain amount of space needs to be lost inside. The structure of the common cylindrical battery in the prior art is as follows: Figure 7 As shown, the structure of the negative electrode is to use the negative electrode shell bottom 51 to cooperate with the sealing plug 52 to install the negative electrode bus 54 at the bottom of the internal battery cell, wherein the negative electrode shell bottom 51 is welded to the external shell, and the sealing plug 52 is fixed by a sealing steel sheet 53, while the structure of the positive electrode is to use the positive electrode column 57 to pass through the positive electrode stop frame 56, the sealing ring 61, the insulator 58 and the stainless steel ring 60 from bottom to top, and then rivet them into a whole, wherein the positive electrode stop frame 56 and the sealing ring 61 are located inside the battery shell, and then the bottom of the positive electrode column 57 is connected to the positive electrode welding nail 59, and the bottom of the positive electrode welding nail 59 is welded with a positive electrode bus 55, and the positive electrode bus 55 is connected to the battery cell to finally form a positive electrode structure. However, the structure of the cylindrical battery inside the shell occupies a certain internal space of the battery, resulting in the battery's energy density being not high enough. Summary of the Invention

[0003] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a new type of steel shell cylindrical structure battery and its assembly method, eliminating the positive and negative poles and weak conductive and insulating plastic parts, using the substrate, shell and connecting pieces for connection, optimizing the battery structure, saving the internal space of the battery, and thus improving the energy density of the battery.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A new type of steel shell cylindrical structure battery, comprising a steel shell, a battery cell arranged inside the steel shell, a negative electrode connecting piece connected to the bottom of the battery cell, and a positive electrode assembly connected to the top of the battery cell;

[0006] The positive electrode assembly includes a positive electrode connecting piece, the bottom of the positive electrode connecting piece is connected to a positive electrode connecting block, the top of the positive electrode connecting piece is provided with an aluminum substrate, the edge of the aluminum substrate is provided with an insulating sealing ring, the top of the aluminum substrate is connected to a sealing aluminum cap, and a sealing rubber plug is installed in the middle of the positive electrode connecting block, and the sealing rubber plug is located inside the sealing aluminum cap.

[0007] As a further solution of the present invention: the positive electrode assembly and the steel shell are connected by roller sealing.

[0008] As a further solution of the present invention: a mounting hole is opened in the middle of the aluminum substrate for the positive electrode connection block to penetrate, and a liquid injection port is opened in the middle of the positive electrode connection block, and a sealing plug is installed on the liquid injection port.

[0009] As a further solution of the present invention: the sealing aluminum cap and the aluminum substrate are connected by laser welding, and the aluminum substrate and the positive electrode connecting piece are connected by penetration welding.

[0010] As a further solution of the present invention, the aluminum substrate is coupled with an insulating sealing ring and is rolled and sealed with the steel shell.

[0011] As a further solution of the present invention: a mounting hole is opened at one end of the aluminum substrate, an explosion-proof valve is welded on one side of the mounting hole, and an explosion-proof valve protective film is attached to the other side.

[0012] As a further solution of the present invention: a method for assembling a novel steel-shell cylindrical structure battery, which is applied to the production and assembly of the novel steel-shell cylindrical structure battery, the method comprises the following steps:

[0013] Step 1: Insert the positive electrode connection block through the assembly hole on the back of the positive electrode connection piece and weld it to the positive electrode of the battery cell;

[0014] Step 2: Weld the negative electrode connecting piece to the negative electrode of the battery cell;

[0015] Step 3: Insert the battery cell with the negative and positive electrode connectors welded into the steel case, with the negative electrode connector facing downward. Then, use a tool to press the negative electrode connector at the bottom through the hole in the middle of the battery cell to make it contact with the bottom of the steel case, and then perform resistance welding.

[0016] Step 4: After the negative electrode connecting piece is welded, weld the explosion-proof valve to the aluminum substrate, then apply the explosion-proof valve protective film, put on the insulating sealing ring and insert it into the positive electrode area of ​​the steel shell, control the height of the aluminum substrate, and roll-seal the steel shell and the aluminum substrate;

[0017] Step 5: Use the aluminum substrate to weld the concave area of ​​the sealed aluminum cap to penetrate the internal positive electrode connecting piece and weld the aluminum substrate and the positive electrode connecting piece together;

[0018] Step 6: Inject the electrolyte from the liquid injection port, then plug the sealing rubber plug, place the sealing aluminum cap, and perform laser welding to weld the sealing aluminum cap to the aluminum substrate.

[0019] Beneficial effects of the present invention:

[0020] The present invention eliminates the positive and negative poles and weakly conductive and insulating plastic parts, thereby further extending the size of the steel shell and increasing the internal space of the steel shell. At the same time, the battery structure is optimized, and the base plate, shell and connecting piece are used for connection, which saves the internal space of the battery and thus improves the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall explosion structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the exploded structure of the positive electrode assembly of the present invention;

[0024] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0025] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0026] Figure 5 This is a schematic diagram of the connection structure between the positive electrode connecting block and the positive electrode connecting piece of the present invention;

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the connection between the positive electrode connecting block and the positive electrode connecting piece of the present invention;

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of a cylindrical battery in the prior art;

[0029] Figure 8 This is a schematic diagram of the internal cell size of a cylindrical battery in the prior art;

[0030] Figure 9 It is a schematic diagram of the internal battery cell dimensions of the present invention.

[0031] In the figure: 1. Steel shell; 2. Battery cell; 3. Negative electrode connecting piece; 4. Positive electrode assembly; 41. Insulating sealing ring; 42. Positive electrode connecting block; 43. Positive electrode connecting piece; 44. Explosion-proof valve; 45. Aluminum substrate; 46. Explosion-proof valve protective film; 47. Sealing rubber plug; 48. Sealing aluminum cap; 421. Liquid filling port; 51. Negative electrode shell bottom; 52. Sealing plug; 53. Sealing steel sheet; 54. Negative electrode busbar; 55. Positive electrode busbar; 56. Positive electrode stopper; 57. Positive electrode post; 58. Insulator; 59. Positive electrode welding nail; 60. Stainless steel ring; 61. Sealing ring. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] The structure of cylindrical batteries commonly used in the prior art is as follows: Figure 7 As shown, the structure of the negative electrode is to use the negative electrode shell bottom 51 to cooperate with the sealing plug 52 to install the negative electrode bus 54 at the bottom of the internal battery cell, wherein the negative electrode shell bottom 51 is welded to the external shell, and the sealing plug 52 is fixed by a sealing steel sheet 53, while the structure of the positive electrode is to use the positive electrode column 57 to pass through the positive electrode stop frame 56, the sealing ring 61, the insulator 58 and the stainless steel ring 60 from bottom to top, and then rivet them into a whole, wherein the positive electrode stop frame 56 and the sealing ring 61 are located inside the battery shell, and then the bottom of the positive electrode column 57 is connected to the positive electrode welding nail 59, and the bottom of the positive electrode welding nail 59 is welded with a positive electrode bus 55, and the positive electrode bus 55 is connected to the battery cell to finally form a positive electrode structure. However, the structure of the cylindrical battery inside the shell occupies a certain internal space of the battery, resulting in the battery's energy density being not high enough.

[0034] like Figures 1-6 As shown, a new type of steel shell cylindrical structure battery includes a steel shell 1, and a battery cell 2 is arranged inside the steel shell 1. The bottom of the battery cell 2 is connected to the negative electrode connecting piece 3, and the top of the battery cell 2 is connected to the positive electrode assembly 4, wherein the positive electrode assembly 4 is connected to the top of the steel shell 1 by roll-sealing. By simplifying the internal structure of the battery, the space inside the battery is saved, and a larger battery cell 2 is placed, the energy density of the battery is improved.

[0035] Further Figure 2 As shown, the above-mentioned positive electrode assembly 4 includes a positive electrode connecting piece 43, and a positive electrode connecting block 42 is connected to the bottom of the positive electrode connecting piece 43 to prevent the positive electrode connecting piece 43 from being too thin and the welding slag from falling into the battery after the subsequent penetration welding. An aluminum substrate 45 is provided on the top of the positive electrode connecting piece 43, and a mounting hole is opened in the middle of the aluminum substrate 45 for the positive electrode connecting block 42 to penetrate. An insulating sealing ring 41 is provided on the edge of the aluminum substrate 45, and a sealing aluminum cap 48 is connected to the top of the aluminum substrate 45, wherein the sealing aluminum cap 48 is connected to the aluminum substrate 45 by laser welding, and the aluminum substrate 45 is welded to the positive electrode connecting piece 43 by penetration welding, further A liquid injection port 421 is provided in the middle of the positive electrode connection block 42, and a sealing plug 47 is installed on the liquid injection port 421, and the sealing plug 47 is located inside the sealing aluminum cap 48, wherein the aluminum substrate 45 plus the insulating sealing ring 41 are roll-sealed with the steel shell 1. By adopting the above-mentioned positive electrode assembly 4, there is no need to rivet the positive electrode connection piece 43 and the steel shell 1, so that the positive electrode direction of the steel shell 1 can be further extended, thereby increasing the internal space of the steel shell 1, and at the same time optimizing the structure of the positive electrode, removing the insulator 58 and the stainless steel ring 60 and other mechanisms in the prior art, further expanding the placement size of the battery cell 2, and improving the energy density inside the battery.

[0036] Furthermore, a mounting hole is opened at one end of the aluminum substrate 45 for welding the explosion-proof valve 44, and then the explosion-proof valve protection film 46 is affixed to prevent the battery from exploding.

[0037] Further Figure 5 and Figure 6 As shown, the middle part of the bottom surface of the positive electrode connecting piece 43 is a concave step, and an assembly hole is opened in the concave middle area. The positive electrode connecting piece 43 is installed on the positive electrode connecting block 42 through the assembly hole, and the injection port 421 on the positive electrode connecting block 42 is connected to the battery cell 2 for adding electrolyte.

[0038] The assembly method of the novel steel shell cylindrical structure battery further comprises the following steps:

[0039] Step 1: Insert the positive electrode connecting block 42 through the assembly hole on the back of the positive electrode connecting piece 43 and weld it to the positive electrode of the battery cell 2;

[0040] Step 2: Weld the negative electrode connecting piece 3 to the negative electrode of the battery cell 2;

[0041] Step 3: Insert the battery cell 2 with the negative electrode connecting tab 3 and the positive electrode connecting tab 43 welded to it into the steel shell 1, with the negative electrode connecting tab 3 facing downward. Then, use a tool to press the negative electrode connecting tab 3 at the bottom through the hole in the middle of the battery cell 2 to make it contact with the bottom of the steel shell 1, and then perform resistance welding.

[0042] Step 4: After the negative electrode connecting piece 3 is welded, the explosion-proof valve 44 is welded to the aluminum substrate 45. Then, the explosion-proof valve protective film 46 is attached. The insulating sealing ring 41 is put on and inserted into the positive electrode area of ​​the steel shell 1. The height of the aluminum substrate 45 is controlled and the steel shell 1 and the aluminum substrate 45 are rolled and sealed.

[0043] Step 5: Use the aluminum substrate 45 to weld the concave area of ​​the sealed aluminum cap 48 to penetrate and weld the internal positive electrode connecting piece 43, welding the aluminum substrate 45 and the positive electrode connecting piece 43 together;

[0044] Step 6: Inject electrolyte from the liquid injection port 421 , then plug the sealing rubber plug 47 , place the sealing aluminum cap 48 , and perform laser welding to weld the sealing aluminum cap 48 to the aluminum substrate 45 .

[0045] like Figure 8 and Figure 9 As shown, when the cylindrical batteries of the present invention and the prior art are at the same height, the height of the battery cell 2 of the present invention is 92.05 mm, while the height of the battery cell 2 of the prior art is 89.70 mm, which is increased by 2.35 mm, further improving the internal energy density of the cylindrical battery.

[0046] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships 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 direction, and a specific direction structure and operation, and therefore, cannot be understood as limiting the present invention. In addition, "first" and "second" are only for descriptive purposes 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.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or 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 the present invention based on the specific circumstances.

[0048] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A steel shell cylindrical structure battery, characterized in that: It comprises a steel shell (1), a battery cell (2) is arranged inside the steel shell (1), a negative electrode connecting piece (3) is connected to the bottom of the battery cell (2), and a positive electrode assembly (4) is connected to the top of the battery cell (2); The positive electrode assembly (4) includes a positive electrode connecting piece (43), the bottom of the positive electrode connecting piece (43) is connected to a positive electrode connecting block (42), an aluminum substrate (45) is provided on the top of the positive electrode connecting piece (43), an insulating sealing ring (41) is provided on the edge of the aluminum substrate (45), a sealing aluminum cap (48) is connected to the top of the aluminum substrate (45), a sealing rubber plug (47) is installed in the middle of the positive electrode connecting block (42), and the sealing rubber plug (47) is located inside the sealing aluminum cap (48); The positive electrode assembly (4) and the steel shell (1) are connected by roller sealing; A mounting hole is provided in the middle of the aluminum substrate (45) for the positive electrode connection block (42) to penetrate therethrough, and a liquid injection port (421) is provided in the middle of the positive electrode connection block (42), and a sealing rubber plug (47) is installed on the liquid injection port (421).

2. A steel shell cylindrical structure battery according to claim 1, characterized in that: The sealing aluminum cap (48) and the aluminum substrate (45) are connected by laser welding, and the aluminum substrate (45) and the positive electrode connecting piece (43) are connected by penetration welding.

3. A steel shell cylindrical structure battery according to claim 1, characterized in that: The aluminum substrate (45) is coupled with an insulating sealing ring (41) and is rolled and sealed with the steel shell (1).

4. A steel shell cylindrical structure battery according to claim 1, characterized in that: A mounting hole is provided at one end of the aluminum substrate (45), an explosion-proof valve (44) is welded on one side of the mounting hole, and an explosion-proof valve protective film (46) is affixed to the other side.

5. A method for assembling a steel shell cylindrical structure battery, characterized in that: Applied to the production and assembly of the steel shell cylindrical structure battery according to claim 4, the method comprises the following steps: Step 1: insert the positive electrode connecting block (42) through the assembly hole on the back of the positive electrode connecting piece (43) and weld it to the positive electrode of the battery cell (2); Step 2: Welding the negative electrode connecting piece (3) to the negative electrode of the battery cell (2); Step 3: Insert the battery cell (2) with the negative electrode connecting piece (3) and the positive electrode connecting piece (43) welded thereto into the steel shell (1), with the negative electrode connecting piece (3) facing downwards, and then use a tool to press the negative electrode connecting piece (3) at the bottom through the hole in the middle of the battery cell (2) to make it contact with the bottom of the steel shell (1), and then perform resistance welding; Step 4: After the negative electrode connecting piece (3) is welded, the explosion-proof valve (44) and the aluminum substrate (45) are welded, and then the explosion-proof valve protective film (46) is affixed. The insulating sealing ring (41) is put on and inserted into the positive electrode area of ​​the steel shell (1). The height of the aluminum substrate (45) is controlled, and the steel shell (1) and the aluminum substrate (45) are rolled and sealed; Step 5: Using the aluminum substrate (45) to weld the concave area of ​​the sealed aluminum cap (48) to penetrate and weld the internal positive electrode connecting piece (43), and weld the aluminum substrate (45) and the positive electrode connecting piece (43) together; Step 6: Inject the electrolyte from the liquid injection port (421), then plug the sealing rubber plug (47), place the sealing aluminum cap (48), and perform laser welding to weld the sealing aluminum cap (48) to the aluminum substrate (45).

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