Battery pole piece with rivet welding type battery tab and sodium ion battery

Abstract

The battery pole piece comprises a plurality of layers of positive pole pieces and negative pole pieces which are mutually overlapped, the positive pole pieces and the negative pole pieces are respectively reserved at two ends of the positive pole pieces and two ends of the negative pole pieces, and metal sheets are respectively riveted on the positive pole pieces and the negative pole pieces through rivets to form a positive pole and a negative pole of the battery. The utility model provides a novel tab connection technology, the output efficiency can be improved by conveniently and quickly realizing the lead-out of the tab with a film coating material, and a loop can be disconnected to play a protection role in abnormal abuse (short circuit, high-current discharge and the like) states due to the electronic communication conductive function of the riveting part of the rivet.

Description

Technical Field

[0001] The utility model relates to a sodium ion battery, in particular to a battery pole piece with a rivet-welded battery pole ear and a sodium ion battery. Background Art

[0002] The existing positive and negative electrode plates of sodium ion batteries both contain exposed metallic aluminum foil. The positive and negative electrodes are electrically connected by 1) leading out aluminum tabs and ultrasonically welding them to the adapter, and then laser welding the connecting plate to the pole; or by 2) ultrasonically pre-welding the positive and negative tabs and then directly laser-beaming the pre-welding area without passing through the adapter to weld them to the pole to achieve electrical connection.

[0003] The existing welding technology is only for aluminum metal tabs without film covering the surface, that is, the positive and negative tabs of the sodium ion battery have a metallic luster, bare aluminum metal surface smooth structure, such as the tab at the extension of the pole piece is metal aluminum, and the metal aluminum surface is not covered by the positive and negative electrode materials. Since the pole piece electrons are concentrated on the tabs, it is easy to cause excessive internal resistance and heat in the tab connection. However, if the surface contains active material film and there is no aluminum metal tab, it cannot be directly welded by ultrasonic or laser welding, which will destroy the surface containing active material film. Utility Model Content

[0004] The utility model is to lead out the positive and negative electrode tabs by fixing with rivets, and the specific technical scheme is as follows:

[0005] A battery electrode with a rivet-welded battery electrode, comprising: a plurality of positive electrode sheets, one end of the positive electrode sheet is provided with a positive electrode ear, and the positive electrode ear is provided with a plurality of positive electrode rivet holes; a plurality of negative electrode sheets, one end of the negative electrode sheet is provided with a negative electrode ear, and the negative electrode ear is provided with a plurality of negative electrode rivet holes; the positive and negative electrode ears are provided with film materials; a positive electrode metal sheet and a negative electrode metal sheet, one end of the positive electrode metal sheet and the negative electrode metal sheet are provided with a plurality of electrode ear rivet holes; a plurality of diaphragms and a plurality of rivets; the positive electrode sheet and the negative electrode sheet are stacked in sequence, and the positive electrode ear and the negative electrode ear are arranged at two ends facing each other, and the positive electrode rivet hole and the negative electrode rivet hole are provided. The rivet holes of the two electrodes correspond to each other; the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet; the positive electrode metal sheet is arranged at one end of the positive electrode ear, and the electrode ear rivet hole corresponds to the positive electrode rivet hole; the negative electrode metal sheet is arranged at one end of the negative electrode ear, and the electrode ear rivet hole corresponds to the negative electrode rivet hole; the rivet passes through the electrode ear rivet hole and the positive electrode rivet hole to weld the positive electrode metal sheet and the positive electrode ear together to form the positive electrode of the battery; the rivet passes through the electrode ear rivet hole and the negative electrode rivet hole to connect the negative electrode metal sheet and the negative electrode ear together to form the negative electrode of the battery.

[0006] Preferably, the number of the tab rivet holes, the positive electrode rivet holes and the negative electrode rivet holes is four.

[0007] Preferably, the rivet contains protruding thorns around it, which are welded to each layer of the positive electrode ears and each layer of the negative electrode ears to achieve electrical connection during the width expansion during the riveting process, and at the same time, the positive electrode metal sheet and the positive electrode ears are electrically connected, and the negative electrode metal sheet and the negative electrode ears are electrically connected.

[0008] The utility model also discloses a sodium ion battery, comprising the battery pole piece mentioned above; a packaging shell; an electrolyte; the battery pole piece and the electrolyte are packaged in the packaging shell; the positive metal sheet and the negative metal sheet are exposed at both ends of the packaging shell to form a battery positive electrode and a battery negative electrode.

[0009] The beneficial effects of the utility model are: 1) providing a new type of pole ear connection technology, which can realize the lead-out of the winding core pole ear conveniently and quickly, thereby improving the output efficiency; 2) the positive and negative pole pieces without pole ear lead-out can be effectively utilized to improve the pole piece utilization efficiency, reduce pole piece scrapping, and even recycle the pole pieces; 3) the four-rivet riveted parts have the function of electronic connectivity and conduction, and can disconnect the circuit to play a protective role under abnormal abuse (short circuit, high current discharge, etc.) conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present invention and constitute a part 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.

[0011] Figure 1 It is a schematic diagram of the structure of the positive and negative electrode sheets of the utility model;

[0012] Figure 2 This is a schematic diagram of the three-dimensional structure of the sodium ion battery of the utility model;

[0013] Figure 3 It is a partial structural cross-sectional view of the sodium ion battery of the utility model;

[0014] Figure 4 This is a structural explosion diagram of the sodium ion battery of the utility model. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0016] like Figure 1Shown are a positive electrode sheet 110 and a negative electrode sheet 111. The positive electrode sheet 110 has a positive electrode ear 112 at one end, and the negative electrode sheet 111 has a negative electrode ear 113 at one end. The surfaces of the positive electrode ear 112 and the negative electrode ear 113 have film materials. Both sides of the positive electrode ear 112 and the negative electrode ear 113 contain active material. The active material of the positive electrode sheet 110 contains one or more of layered oxides, polyanions, and Prussian white (blue); the active material of the negative electrode sheet 113 contains one or more of hard carbon, soft carbon, anthracite or phosphorus-carbon composites, and metal oxides.

[0017] Four positive rivet holes 114 are punched on the positive ear 112, and four negative rivet holes 115 are punched on the negative ear 113. In addition, a positive metal sheet 101 and a negative metal sheet 102 with ear rivet holes 104 are provided. The multi-layer positive electrode sheets 110 and negative electrode sheets 111 are stacked alternately, and a separator 120 is placed in the middle. The positive ear 112 and the negative ear 113 are arranged at both ends facing each other. The positive metal sheet 101 and the negative metal sheet 102 are welded to the positive ear 112 and the negative ear 113 by rivets 130 to form the positive and negative electrodes of the battery, and the battery electrode sheet 100 (see Figure 4 ).

[0018] like Figure 2 , 3 The sodium ion battery 200 is shown, including a packaging shell 220, which is generally made of aluminum-plastic film material, and the battery pole piece 100 is contained therein, and an electrolyte (not shown) is injected to form a sodium ion battery. The positive metal sheet 101 and the negative metal sheet 102 are exposed at both ends of the packaging shell 220 to form the battery positive electrode 201 and the battery negative electrode 202 respectively.

[0019] like Figure 4As shown in the figure, various components of the sodium ion battery 200 are opened, and several layers of positive electrode sheets 110 and negative electrode sheets 111 are stacked in sequence, and a separator 120 is placed in the middle of each layer, and the positive electrode ear 112 and the negative electrode ear 113 are arranged at both ends facing each other, and the positive electrode rivet hole 114 and the negative electrode rivet hole 115 correspond to each other; the positive electrode metal sheet 101 is arranged at one end of the positive electrode ear 112, and the ear rivet hole 104 can correspond to the positive electrode rivet hole 114, and the rivet 13 0 passes through the tab rivet hole 104 and the positive electrode rivet hole 114 to weld the positive electrode metal sheet 101 and the positive electrode tab 112 together to form the battery positive electrode 201; the negative electrode metal sheet 102 is arranged at one end of the negative electrode tab 113, and the tab rivet hole 104 can correspond to the negative electrode rivet hole 115; the rivet 130 passes through the tab rivet hole 104 and the negative electrode rivet hole 115 to weld the negative electrode metal sheet 102 and the negative electrode tab 113 together to form the battery negative electrode 202. In this embodiment, the number of the tab rivet hole 104, the positive electrode rivet hole 114 and the negative electrode rivet hole 115 is four. In fact, the number of the positive electrode rivet hole 114, the negative electrode rivet hole 115 and the tab rivet hole 104 can be set according to actual conditions, and 2 or more are all acceptable.

[0020] The rivet 130, the positive electrode ear 112, and the negative electrode ear 113 are all made of aluminum, and the positive and negative electrode sheet substrates of the sodium ion battery are both aluminum current collectors; the perforated part of the rivet 130 contains protruding thorns, which can expand all over the body as the riveting height decreases during the riveting process, and the protruding thorns are squeezed and contacted with the positive electrode ear 112 and the positive electrode metal sheet 101, and the negative electrode ear 113 and the negative electrode metal sheet 102 to achieve electronic connection.

[0021] The above examples are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A battery pole piece (100) with a rivet-welded battery pole lug, characterized in that include: A plurality of positive electrode sheets (110), wherein one end of the positive electrode sheet (110) is provided with a positive electrode ear (112), and the positive electrode ear (112) is provided with a plurality of positive electrode rivet holes (114); A plurality of negative electrode sheets (111), one end of each negative electrode sheet (111) being provided with a negative electrode ear (113), and each negative electrode ear (113) being provided with a plurality of negative electrode rivet holes (115); The positive electrode ear (112) and the negative electrode ear (113) are provided with film material; It also includes a positive metal sheet (101) and a negative metal sheet (102), wherein one end of each of the positive metal sheet (101) and the negative metal sheet (102) is provided with a plurality of lug rivet holes (104); A plurality of diaphragms (120) and a plurality of rivets (130); The positive electrode sheet (110) and the negative electrode sheet (111) are stacked in sequence, and the positive electrode ear (112) and the negative electrode ear (113) are arranged at two ends facing each other, and the positive electrode rivet hole (114) and the negative electrode rivet hole (115) correspond to each other; The separator (120) is arranged between the positive electrode sheet (110) and the negative electrode sheet (111); The positive electrode metal sheet (101) is arranged at one end of the positive electrode ear (112), and the ear rivet hole (104) corresponds to the positive electrode rivet hole (114); The negative electrode metal sheet (102) is arranged at one end of the negative electrode ear (113), and the ear rivet hole (104) corresponds to the negative electrode rivet hole (115); The rivet (130) passes through the tab rivet hole (104) and the positive electrode rivet hole (114) to weld the positive electrode metal sheet (101) and the positive electrode tab (112) together to form a battery positive electrode (201); The rivet (130) passes through the tab rivet hole (104) and the negative electrode rivet hole (115) to weld the negative electrode metal sheet (102) and the negative electrode tab (113) together to form a battery negative electrode (202).

2. The battery pole piece (100) according to claim 1, characterized in that: The number of the pole lug rivet hole (104), the positive electrode rivet hole (114) and the negative electrode rivet hole (115) is four.

3. The battery pole piece (100) according to claim 1, characterized in that: The rivet (130) has protruding thorns on its body, which expand in width during the riveting process and are welded to each layer of the positive electrode ears (112) and each layer of the negative electrode ears (113) to achieve electrical connection, thereby achieving electrical connection between the positive electrode metal sheet (101) and the positive electrode ears (112), and electrical connection between the negative electrode metal sheet (102) and the negative electrode ears (113).

4. A sodium ion battery (200), characterized in that: Comprising a battery pole piece (100) as claimed in any one of claims 1 to 3; A packaging shell (220); Electrolyte; The battery electrode (100) and the electrolyte are packaged in the packaging shell (220); The positive electrode metal sheet (101) and the negative electrode metal sheet (102) are exposed at two ends of the packaging shell (220) to form a battery positive electrode (201) and a battery negative electrode (202).

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