Nonaqueous lithium ion secondary battery

Abstract

The utility model relates to a non-aqueous lithium ion secondary battery, which comprises a laminated body which is provided with a plurality of electrodes containing bipolar electrodes and at least one partition plate positioned between the adjacent electrodes, and is sealed with electrolyte, the bipolar electrode has a current collector, a positive electrode active material layer formed on one surface of the current collector, and a negative electrode active material layer formed on the other surface of the current collector. A sealing member that covers the outer peripheral edge of the current collector in a liquid-tight state; a positive electrode can and a negative electrode can covering the periphery of the laminated body and the sealing member; the gasket is positioned between the positive electrode tank and the negative electrode tank and insulates the positive electrode tank from the negative electrode tank; and a voltage line electrically connected to the current collector, at least a portion of the voltage line being located outside the positive electrode can and the negative electrode can. As a result, it is possible to provide a non-aqueous lithium ion secondary battery which is provided with a plurality of electrodes including bipolar electrodes, and which is capable of increasing the operating voltage and reducing the interface resistance.

Description

Technical Field

[0001] This utility model relates to a non-aqueous lithium-ion secondary battery. Background Technology

[0002] Patent document 1 discloses a coin-type all-solid-state battery. This all-solid-state battery comprises: a laminate having multiple electrodes including bipolar electrodes, a solid electrolyte and a separator; a sealing member covering the outer periphery of the laminate; a positive electrode can and a negative electrode can covering the laminate and the sealing member; and a gasket located between the positive electrode can and the negative electrode can.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2023-047443

[0004] The all-solid-state battery in Patent Document 1 has room for improvement in terms of increasing operating voltage and reducing interface resistance. Utility Model Content

[0005] In view of the above, the purpose of this utility model is to provide a non-aqueous lithium-ion secondary battery having multiple electrodes including bipolar electrodes and being able to improve the operating voltage and reduce the interface resistance.

[0006] The non-aqueous lithium-ion secondary battery provided by this utility model comprises: a laminate having a plurality of electrodes including bipolar electrodes and at least one separator located between adjacent electrodes, and an electrolyte sealed therein; the bipolar electrodes having a current collector, a positive active material layer formed on one side of the current collector, and a negative active material layer formed on the other side of the current collector; a sealing member covering the outer periphery of the current collector in a liquid-tight state; a positive electrode can and a negative electrode can covering the laminate and the sealing member; a gasket located between the positive electrode can and the negative electrode can and insulating the positive electrode can and the negative electrode can; and a voltage line electrically connected to the current collector, at least a portion of which is located on the outside of the positive electrode can and the negative electrode can.

[0007] The non-aqueous lithium-ion secondary battery provided by this invention comprises a laminated body containing an electrolyte, the laminated body having multiple electrodes including bipolar electrodes and at least one separator located between adjacent electrodes. Therefore, the non-aqueous lithium-ion secondary battery of this invention can increase the operating voltage by increasing the number of bipolar electrodes.

[0008] In the non-aqueous lithium-ion secondary battery of this invention, charge carriers such as lithium ions move between the electrodes via a separator. Therefore, the non-aqueous lithium-ion secondary battery of this invention can reduce interface resistance.

[0009] As described above, the non-aqueous lithium-ion secondary battery of this invention has the following excellent technical effects: it has multiple electrodes including bipolar electrodes, and it can improve the operating voltage and reduce the interface resistance. Attached Figure Description

[0010] Figure 1 This is a cross-sectional schematic diagram of the non-aqueous lithium-ion secondary battery involved in the implementation method. Detailed Implementation

[0011] Figure 1 This is a cross-sectional view of the non-aqueous lithium-ion secondary battery (hereinafter referred to as battery 10) involved in the embodiment. Figure 1 As shown, the coin-shaped battery 10 has a stack 15, an electrolyte, a sealing component 30, a positive electrode container 35, a negative electrode container 40, a gasket 45, and a voltage line 50.

[0012] The laminate 15 is formed by placing multiple electrodes and multiple separators 25 in one direction ( Figure 1 These electrodes are stacked on top of each other in the vertical direction. They include a negative terminal electrode (electrode) 17, a positive terminal electrode (electrode) 20, and multiple bipolar electrodes (electrodes) 23.

[0013] The negative terminal electrode 17 includes a current collector 18 and a side disposed on the current collector 18. Figure 1 The negative electrode active material layer 19 is located on the top of the electrode. The positive electrode terminal electrode 20 has a current collector 18 and a current collector disposed on one side of the current collector 18. Figure 1 The positive electrode active material layer 21 is located below the current collector. Each bipolar electrode 23 has a current collector 18 and is disposed on one side of the current collector 18. Figure 1 The negative electrode active material layer 19 on the top and the other side of the current collector 18 ( Figure 1 The positive electrode active material layer 21 (below) is the layer below.

[0014] A separator 25 is provided between the negative active material layer 19 of the negative terminal electrode 17 and the positive active material layer 21 of the bipolar electrode 23 adjacent to the negative terminal electrode 17. Similarly, a separator 25 is provided between the positive active material layer 21 of the positive terminal electrode 20 and the negative active material layer 19 of the bipolar electrode 23 adjacent to the positive terminal electrode 20. Furthermore, a separator 25 is provided between the negative active material layer 19 of the adjacent bipolar electrode 23 and the positive terminal electrode 20.

[0015] The two end faces of the laminate 15, which includes a negative terminal electrode 17, a positive terminal electrode 20, a bipolar electrode 23, and a separator 25, are formed by current collectors 18 in the lamination direction. For example... Figure 1As shown, the outer periphery of each current collector 18 is located on the outer periphery side of the negative electrode active material layer 19, the positive electrode active material layer 21 and the separator 25.

[0016] A generally cylindrical sealing member 30 is provided on the outer periphery of the laminate 15. More specifically, the sealing member 30 is connected to the outer peripheral end (current collector foil) of each current collector 18 in a liquid-tight state. The sealing member 30 is made of a material that is resistant to liquid and has low water permeability to the non-aqueous electrolyte described later. Examples of materials for the sealing member 30 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).

[0017] Furthermore, the base 36 of the positive electrode can 35, which is made of conductive material, is connected to the current collector 18 of the positive electrode terminal electrode 20 in a liquid-tight state, and the outer peripheral portion 37, which is an annular body located on the outer peripheral side of the laminate 15, is located on the outer peripheral side of the base 36 of the positive electrode can 35.

[0018] Furthermore, the base 41 of the negative electrode can 40, which is made of conductive material, is connected to the current collector 18 of the negative electrode terminal electrode 17 in a liquid-tight state, and the outer peripheral portion 42, which is an annular body located on the outer peripheral side of the outer peripheral portion 37, is located on the outer peripheral side of the outer peripheral portion 37.

[0019] Furthermore, a gasket 45 is filled in the annular space surrounded by the outer peripheral surface, outer peripheral portion 37, and outer peripheral portion 42 of the sealing member 30. The positive electrode tank 35 and the negative electrode tank 40 are insulated by the gasket 45. Preferably, the gasket 45 is connected to the outer peripheral portion 37 and outer peripheral portion 42 when the laminate 15 is subjected to a load in the lamination direction of a predetermined value or higher. The gasket 45 is made of a material that has insulating properties and low moisture permeability. In addition, if the sealing member 30 can perform a sufficient moisture permeability prevention function, the moisture permeability prevention function of the material of the gasket 45 is irrelevant. Examples of materials for the gasket 45 include polypropylene (PP), polyethylene (PE), and nylon.

[0020] A non-aqueous electrolyte (hereinafter referred to as electrolyte) is sealed in the laminate 15.

[0021] Furthermore, a voltage line 50 made of conductive material is connected to one end of the current collector 18 of each bipolar electrode 23 on its outer peripheral side (current collector foil). The other end of the voltage line 50 is led out to the outside of the positive electrode can 35 and the negative electrode can 40.

[0022] Next, the function and effects of this implementation method will be explained.

[0023] The battery 10 has a stack 15, which includes multiple electrodes (negative terminal electrode 17, positive terminal electrode 20, and bipolar electrodes 23) comprising multiple bipolar electrodes 23 and multiple separators 25 located between adjacent electrodes, and an electrolyte is sealed within the stack 15. Therefore, the battery 10 can increase its operating voltage by increasing the number of bipolar electrodes 23.

[0024] Furthermore, in battery 10, charge carriers such as lithium ions move between adjacent electrodes via separator 25. Therefore, battery 10 can reduce interface resistance.

[0025] Furthermore, by connecting the outer end of the voltage line 50 to a voltage detection device (not shown), it is possible to detect whether a malfunction has occurred in the battery 10. If a malfunction occurs in the battery 10, its use can be stopped. Additionally, the voltage detection device can monitor the charging state of the battery 10 and perform voltage adjustment between each electrode.

[0026] The battery 10 involved in the embodiments has been described above, but appropriate design changes can be made without departing from the spirit of the present invention.

[0027] For example, the voltage line 50 can be connected to the current collector 18 (current collector foil) of the negative terminal electrode 17 and the current collector 18 (current collector foil) of the positive terminal electrode 20. Alternatively, instead of connecting the voltage line 50 to the current collector 18 of the negative terminal electrode 17 and the current collector 18 of the positive terminal electrode 20, the voltage line 50 can be connected to the positive electrode tank 35 and the negative electrode tank 40.

Claims

1. A non-aqueous lithium-ion secondary battery, characterized in that, have: A laminate having a plurality of electrodes including bipolar electrodes and at least one partition located between adjacent electrodes, and encapsulated with an electrolyte, wherein the bipolar electrodes have a current collector, a positive active material layer formed on one side of the current collector, and a negative active material layer formed on the other side of the current collector. A sealing component covers the outer periphery of the current collector in a liquid-tight state; Positive and negative electrode containers cover the laminate and the sealing component. A gasket, located between the positive electrode can and the negative electrode can, insulates the positive electrode can from the negative electrode can; and The voltage line is electrically connected to the current collector, and at least a portion of it is located outside the positive electrode tank and the negative electrode tank.

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