Secondary battery

Abstract

The utility model discloses a secondary battery, which belongs to the technical field of new energy batteries and comprises a prismatic aluminum shell, a torrent plate welding rear roll core and a cover plate. The torrent plate post-welding roll core comprises a tab flattening roll core, and the tab flattening roll core is respectively welded with one end of the negative collector plate and one end of the positive collector plate in a laser penetration manner; the other end of the negative collector plate is welded with the aluminum shell, and the other end of the positive collector plate is welded with the cover plate; the tab flattening roll core consists of a cylindrical roll core, a retainer and a prismatic roll core; the retainer is of a structure with an outer side standard prism and an inner side standard cylindrical hole. According to the utility model, the combined roll core of the cylindrical roll core and the prismatic roll core is adopted, so that the energy capacity of the single prismatic battery is greatly improved; the retainer can play a role in restraining and supporting the cylindrical roll core, effective winding forming of the prism roll core is ensured, and fixing of the cylindrical roll core on the inner side and winding forming of the prism roll core on the outer side are perfectly considered; and under the action of the aluminum shell and the retainer, the prism roll core and the cylindrical roll core can be uniformly stressed during expansion, so that the safety is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy batteries, and specifically relates to a secondary battery. Background Art

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

[0003] Driven by energy conservation, emission reduction, and environmental protection, secondary batteries, a key component of new energy, are experiencing increasing demand in both energy storage and transportation. To address this trend, the secondary battery market is experiencing intense competition, with clear trends: high safety and high cost-performance. Making secondary batteries even safer and achieving higher cell energy density are key technical challenges. Utility Model Content

[0004] In response to the above problems, the present invention provides a secondary battery that adopts a combined winding core of a cylindrical winding core and a prismatic winding core, which can greatly improve the energy capacity of a single prismatic battery; a cylindrical winding core is arranged in a retaining frame, and a prismatic winding core is wound on the retaining frame. Under the action of the retaining frame and the aluminum shell, the prismatic winding core and the cylindrical winding core can be evenly stressed when expanding, ensuring safety.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A secondary battery comprises a prismatic aluminum shell, a core after welding a current disc, and a cover plate; the core after welding a current disc comprises a tab flattened core, which is laser-penetrated and welded to one end of a negative current collector disc and a positive current collector disc, respectively; the other end of the negative current collector disc is welded to the aluminum shell, and the other end of the positive collector disc is welded to the cover plate; the tab flattened core consists of a cylindrical core, a retaining frame, and a prismatic core; the retaining frame adopts a structure of a standard prism on the outside and a standard cylindrical hole on the inside.

[0007] Preferably, the top of the aluminum shell and the edge of the cover plate are welded together by laser seam welding.

[0008] Preferably, the negative current collecting disc includes a negative current collecting disc coil core side and a negative current collecting disc aluminum shell side; both the negative current collecting disc coil core side and the negative current collecting disc aluminum shell side are copper sheets, and the two are welded together via a leaf spring.

[0009] Preferably, the negative collector disk core side and the tab flattened core are laser-penetrated and welded together, and the negative collector disk aluminum shell side and the aluminum shell bottom are laser-penetrated and welded together.

[0010] Preferably, the positive current collecting disk includes a positive current collecting disk coil core side, a positive current collecting disk cover plate side, and a positive electrode column; the positive current collecting disk coil core side and the positive current collecting disk cover plate side are both aluminum sheets, and the two are welded together through a leaf spring.

[0011] Preferably, the positive current collecting disk core side is laser-penetrated and welded to the tab flattened core, and the positive current collecting disk cover plate side is laser-seamed and welded to the positive electrode column.

[0012] Preferably, a liquid injection hole is provided on the positive electrode column, and a cover plate positive electrode column through hole is provided in the middle of the cover plate. The positive electrode column first passes through the cover plate positive electrode column through hole and then is laser seam welded to the cover plate.

[0013] Preferably, the inner hole of the retainer is circular, and the cylindrical winding core is fixedly installed; the outer side of the retainer is prismatic, and is used for winding the prismatic winding core.

[0014] Preferably, the cylindrical core tabs at both ends of the cylindrical core and the prismatic core tabs at both ends of the prismatic core are flattened at the same time to form the negative electrode flattened tabs and the positive electrode flattened tabs of the tab flattened core, respectively.

[0015] Preferably, an end face QR code is provided on the cover plate; a side QR code is provided on the side of the aluminum shell, and a bottom QR code is provided on the bottom of the aluminum shell; and a circular explosion-proof valve is also provided on the bottom of the aluminum shell.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are:

[0017] The utility model adopts a combined winding core of a cylindrical winding core and a prismatic winding core, which can greatly improve the energy capacity of a single prismatic battery; the retaining frame adopts a structure of a standard prism on the outside and a standard cylindrical hole on the inside, which can play a role of restraining and supporting the cylindrical winding core, ensuring the effective winding and forming of the prismatic winding core, and perfectly taking into account the fixation of the inner cylindrical winding core and the winding and forming of the outer prismatic winding core; under the action of the aluminum shell and the retaining frame, the prismatic winding core and the cylindrical winding core can be evenly stressed when expanding, ensuring safety.

[0018] The utility model adopts a structural form in which the aluminum shell is negatively charged and the positive pole is positively charged, which can ensure that the positive and negative poles of the secondary battery are on the same side, making it convenient for the secondary battery to form a module and also convenient for the maintenance of the module in the later stage; the positive collecting plate is connected to the positive pole, the inner hole of the positive pole is set as the liquid injection hole, and the circular explosion-proof valve is placed at the bottom of the aluminum shell, which can prepare the basis for placing the secondary battery upside down in the module in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 This is a schematic diagram of the secondary battery composition of an embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the coil core after the torrent disk welding embodiment of the present invention;

[0022] Figure 3 This is an embodiment of the utility model Figure 2 Exploded diagram;

[0023] Figure 4 This is a schematic diagram of a secondary battery according to an embodiment of the present utility model;

[0024] Figure 5 This is an embodiment of the utility model Figure 4 Exploded diagram;

[0025] Figure 6 This is a schematic diagram of a tab flattening winding core according to an embodiment of the present invention;

[0026] Figure 7 This is an embodiment of the utility model Figure 6 Exploded diagram;

[0027] In the picture:

[0028] 100 - Secondary battery; 10001 - Side QR code; 10002 - End QR code; 10003 - Filling hole; 101 - Aluminum shell; 10101 - Circular explosion-proof valve; 102 - Reel after welding of current collecting plate; 103 - Cover plate; 10301 - Positive electrode via hole in cover plate; 201 - Tab flattening reel; 20101 - Negative electrode flattening tab; 20102 - Positive electrode flattening tab; 202 - Negative current collecting plate ;20201-Negative current collecting disk core side; 20202-Negative current collecting disk aluminum shell side; 203-Positive current collecting disk; 20301-Positive current collecting disk core side; 20302-Positive current collecting disk cover side; 20303-Positive pole; 301-Cylindrical core; 30101-Cylindrical core ear; 302-Retaining frame; 30201-Retaining frame inner hole; 303-Prismatic core; 30301-Prismatic core ear. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] The present invention will be described in detail below with reference to the accompanying drawings. This embodiment discloses a secondary battery, such as Figure 1As shown, secondary battery 100 comprises a prismatic aluminum shell 101, a core 102 after tidal disc welding, and a cover plate 103. The top of aluminum shell 101 and the edge of cover plate 103 are welded together using laser seam welding, while the bottom of aluminum shell 101 and the core 102 after tidal disc welding are welded together using laser penetration welding. The prismatic appearance of secondary battery 100 facilitates assembly into modules, thereby increasing the overall energy density of the module.

[0031] like Figure 2 As shown, the core 102 after current plate welding includes a tab flattened core 201, a negative current collecting disk 202, and a positive current collecting disk 203; the negative current collecting disk 202 and the positive current collecting disk 203 are laser-penetrated and welded to the tab flattened core 201 respectively.

[0032] like Figure 3 As shown, the negative collector plate 202 comprises a negative collector plate core 20201 on one side and an aluminum shell 20202 on the other. Both the negative collector plate core 20201 and the aluminum shell 20202 are made of copper sheets, welded together via a leaf spring. The negative collector plate core 20201 is laser-welded to the tab-flattened core 201, while the negative collector plate aluminum shell 20202 is laser-welded to the bottom of the aluminum shell 101.

[0033] like Figure 3 As shown, the positive collector disc 203 includes a positive collector disc core side 20301 on one side and a positive collector disc cover side 20302 and a positive electrode post 20303 on the other side. Both the positive collector disc core side 20301 and the positive collector disc cover side 20302 are made of aluminum sheets, welded together via a leaf spring. The positive collector disc core side 20301 is laser-welded to the tab-flattened core 201; the positive collector disc cover side 20302 is laser-seamed welded to the positive electrode post 20303; and the positive electrode post 20303 is laser-seamed welded to the cover 103.

[0034] like Figure 3 、 Figure 4 As shown, the liquid injection hole 10003 is located on the positive electrode column 20303, and there is an end face QR code 10002 on the cover plate 103 on one side of the positive electrode column 20303; at the same time, there is a side QR code 10001 on the side of the aluminum shell 101 and a bottom QR code on the bottom, and the battery information is input to facilitate identification by staff.

[0035] like Figure 5As shown, a circular explosion-proof valve 10101 is located at the bottom of the aluminum shell 101. To avoid the positive electrode 20303, a cover plate positive electrode through-hole 10301 is provided in the middle of the cover plate 103. The positive electrode 20303 passes through the cover plate positive electrode through-hole 10301. The positive electrode 20303 of the positive current collecting plate 203 first passes through the cover plate positive electrode through-hole 10301 in the middle of the cover plate 103 and is then laser seam welded to the cover plate 103. The circular explosion-proof valve 10101 ensures that if the battery fails during use and the internal pressure exceeds the limit, it can actively release pressure, reducing the risk of battery explosion.

[0036] The aluminum shell is negatively charged and the positive pole is positively charged. This structure ensures that the positive and negative poles of the secondary battery are on the same side, making it convenient for the secondary battery to form a module and also convenient for the later maintenance of the module. The positive collecting plate is connected to the positive pole, the inner hole of the positive pole is set as the liquid injection hole, and the circular explosion-proof valve is placed at the bottom of the aluminum shell. This structural setting is to prepare for the inverted placement of the secondary battery in the module in the future.

[0037] like Figure 6 As shown, the two ends of the tab flattening core 201 are respectively the negative tab flattening tab 20101 and the positive tab flattening tab 20102; Figure 7 As shown, the tab flattening core 201 includes a cylindrical core 301, a retainer 302, and a prismatic core 303. The cylindrical core tabs 30101 at both ends of the cylindrical core 301 and the prismatic core tabs 30301 at both ends of the prismatic core 303 are flattened simultaneously, forming the negative flattened tab 20101 and the positive flattened tab 20102 of the tab flattening core 201, respectively. The retainer 302 has a circular inner hole 30201 for securing the cylindrical core 301; the outer hole is prismatic for winding the prismatic core 303.

[0038] Secondary battery 100 utilizes a combined cylindrical core 301 and prismatic core 303, significantly increasing the energy capacity of a single prismatic battery cell. The retainer 302, with its standard outer prism and inner cylindrical hole, provides support and restraint for cylindrical core 301, ensuring effective winding of prismatic core 303 while perfectly balancing the inner cylindrical core's securement and the outer prismatic core's winding. The aluminum shell and retainer ensure uniform force distribution during expansion of the prismatic and cylindrical cores, ensuring safety. This also effectively reduces lithium deposition and capacity degradation.

[0039] The secondary battery production process in this embodiment is as follows:

[0040] First, a cylindrical core 301 is formed by winding, and cylindrical core tabs 30101 are simultaneously produced. The produced cylindrical core 301 is installed into the inner hole 30201 of the retainer 302. Then, a prismatic core 303 is wound around the outer side of the retainer 302, and prismatic core tabs 30301 are simultaneously produced.

[0041] At the same time, the cylindrical core tabs 30101 on both sides of the cylindrical core 301 and the prismatic core tabs 30301 of the prismatic core 303 are flattened to form the tab-flattened core 201; the negative current collecting disc 202 and the positive current collecting disc 203 are laser-penetrated and welded to form the core 102 after the current disc is welded;

[0042] The welded core 102 of the current collecting disk is placed in the aluminum shell 101. The bottom of the aluminum shell 101 is then welded to the negative collecting disk aluminum shell side 20202 of the negative collecting disk 202. The positive electrode post 20303 of the positive collecting disk 203 is passed through the cover 103. The aluminum shell 101 and the cover 103 are then laser seam welded. Finally, the cover 103 and the positive electrode post 20303 of the positive collecting disk 203 are laser seam welded.

[0043] The assembled secondary battery is baked; then liquid is injected into the secondary battery through the liquid injection hole 10003; then it is formed and replenished; the liquid injection hole 10003 is sealed and welded, and the secondary battery production is completed.

[0044] The secondary battery of the present invention has an appearance of a regular hexagon, but can of course also be presented in other regular polygons. In order to facilitate the inversion of the battery in the module, an aluminum shell is adopted in which the shell is negatively charged, the positive pole is positively charged, the injection hole is located on the positive pole, and the explosion-proof valve is located at the bottom of the aluminum shell. Bipolar columns or other presentation forms are also within the scope of this patent. The battery QR code is located in three places: on the cover, on the side of the shell, and on the bottom of the shell.

[0045] Although the above describes the specific implementation methods of the present invention in conjunction with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or variations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A secondary battery, characterized in that: It includes a prismatic aluminum shell, a core after welding the current disk, and a cover plate; the core after welding the current disk includes a tab flattened core, which is laser-penetrated and welded to one end of the negative current collecting disk and the positive current collecting disk respectively; the other end of the negative current collecting disk is welded to the aluminum shell, and the other end of the positive collecting disk is welded to the cover plate; the tab flattened core consists of a cylindrical core, a retaining frame, and a prismatic core; the retaining frame adopts a structure of an outer prism and an inner cylindrical hole.

2. A secondary battery according to claim 1, characterized in that: The top of the aluminum shell and the edge of the cover plate are welded together by laser seam welding.

3. A secondary battery according to claim 1, characterized in that: The negative current collecting disc comprises a negative current collecting disc coil core side and a negative current collecting disc aluminum shell side; both the negative current collecting disc coil core side and the negative current collecting disc aluminum shell side are copper sheets, and the two are welded together via a leaf spring.

4. A secondary battery according to claim 3, characterized in that: The negative current collecting disk coil core side and the tab flattened coil core are laser penetrated and welded together, and the negative current collecting disk aluminum shell side and the aluminum shell bottom are laser penetrated and welded together.

5. A secondary battery according to claim 1, characterized in that: The positive current collecting disc includes a positive current collecting disc coil core side, a positive current collecting disc cover plate side, and a positive pole; the positive current collecting disc coil core side and the positive current collecting disc cover plate side are both aluminum sheets, and the two are welded together by a leaf spring.

6. A secondary battery according to claim 5, characterized in that: The positive current collecting disk coil core side is laser-penetrated and welded to the tab flattened coil core, and the positive current collecting disk cover plate side is laser-seam-welded to the positive electrode column.

7. A secondary battery according to claim 5, characterized in that: The positive electrode column is provided with a liquid injection hole, and a cover plate positive electrode column through hole is provided in the middle of the cover plate. The positive electrode column first passes through the cover plate positive electrode column through hole and then is laser seam welded to the cover plate.

8. A secondary battery according to claim 1, characterized in that: The inner hole of the retainer is circular and fixedly mounts the cylindrical winding core; the outer side of the retainer is prismatic and is used for winding the prismatic winding core.

9. A secondary battery according to claim 8, characterized in that: The cylindrical core tabs at both ends of the cylindrical core and the prismatic core tabs at both ends of the prismatic core are flattened at the same time to form negative flattened tabs and positive flattened tabs of the tab flattened core, respectively.

10. The secondary battery according to claim 1, wherein: An end face QR code is set on the cover plate; a side face QR code is set on the side of the aluminum shell, and a bottom QR code is set on the bottom of the aluminum shell; a circular explosion-proof valve is also set on the bottom of the aluminum shell.

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