Winding type chromium-based metal oxide high-energy-supply miniature lithium primary cell and lithium primary battery

Abstract

The invention discloses a winding type chromium-based metal oxide high-energy-supply miniature lithium primary cell which comprises a chromium-based metal oxide positive plate, a metal lithium negative plate, a diaphragm and an electrolyte, the miniature lithium primary cell formed by a plurality of winding units is formed in a winding mode, the outermost layer of the miniature lithium primary cell is the positive plate, and the outermost layer of the miniature lithium primary cell is the metal lithium negative plate. Electrolyte is injected into the micro lithium original battery core, the thickness of the winding type chromium-based metal oxide positive plate is 100-200 microns, and the thickness of the winding type metal lithium negative plate is 50-150 microns. The problem that the application of equipment cannot be guaranteed due to the fact that a load cannot work for a long time due to the fact that an existing micro battery is insufficient in energy supply capacity under the limiting condition of limited size or limited weight is effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of micro batteries of chemical power sources, and in particular relates to a high-energy micro lithium primary battery cell and a lithium primary battery of a wound chromium-based metal oxide. Background Art

[0002] With the progress of society, people have more and more demands for intelligent electronic products, which leads to higher and higher requirements for battery performance. At present, recording and video equipment that looks like a "lighter" or a ballpoint pen, or hidden in glasses or power banks, these intelligent electronic products are small, exquisite and highly concealed. They are not only easy to carry, but also easy to use and operate. They are essential practical tools in business, medical, security and other application fields. The characteristics of these electronic products are that the space for providing energy supply is limited, and they are required to provide high power supply capacity for the load within this limited space.

[0003] Currently, the batteries provided for smart electronic products on the market are mainly lithium-ion batteries. Lithium-ion batteries use high-voltage cobalt and lithium as the positive electrode and graphite as the negative electrode. They have low energy density and high self-discharge rate, making it difficult to provide high output capacity and unable to guarantee long-term battery life of the equipment.

[0004] However, the micro-batteries used in smart electronic products prepared by the prior art have poor electrical performance when compared under the same volume or weight conditions, and cannot guarantee the multifunctional application of smart electronic products. CN100561792B A wound lithium-ion battery cell, a method for making a battery, and a battery cell and a battery, which mainly improves the preparation method of a wound lithium-ion battery cell, and is particularly suitable for metal shell batteries, but does not improve the functionality and electrical performance of micro-batteries. CN105322235B A wound lithium-ion battery is aimed at a wound lithium-ion battery cell. The design of the winding position of the positive and negative electrodes in the battery cell is suitable for use in metal shell cylindrical batteries, and it does not solve the problem of poor performance of existing micro-batteries. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a high-energy-supply micro lithium primary cell and a lithium primary battery of a wound chromium-based metal oxide, which effectively solves the problem that the existing micro batteries have insufficient energy supply capacity under the constraints of limited size or limited weight, resulting in the load being unable to work for a long time, and thus being unable to ensure the application of equipment.

[0006] The present invention is implemented as follows: a high-energy-supply micro lithium primary battery cell of a wound chromium-based metal oxide comprises a chromium-based metal oxide positive electrode sheet, a metal lithium negative electrode sheet, a separator and an electrolyte. The micro lithium primary battery cell is formed by winding and is composed of a plurality of winding units. The outermost layer of the micro lithium primary battery cell is the positive electrode sheet. The electrolyte is injected into the micro lithium primary battery cell. The thickness of the wound chromium-based metal oxide positive electrode sheet is 100-200um, and the thickness of the wound metal lithium negative electrode is 50-150um.

[0007] A blank aluminum foil of 2-10 mm is left at one end of the wound chromium-based metal oxide positive electrode sheet, and a blank aluminum foil of 2-20 mm is also left on the corresponding side of the blank aluminum foil, and a positive electrode ear is welded on the blank aluminum foil.

[0008] A copper foil is pressed at one end of the wound metal lithium negative electrode sheet, and a negative electrode ear is welded on the copper foil.

[0009] One end of the wound metal lithium negative electrode sheet is pressed with a copper foil at a pressure of 0.1-10 MPa.

[0010] A high-energy-supply miniature lithium primary battery adopts the high-energy-supply miniature lithium primary battery cell of the wound chromium-based metal oxide.

[0011] The advantages and technical effects of the present invention are as follows:

[0012] 1. The present invention utilizes a wound chromium-based metal oxide positive electrode sheet and a wound metal lithium negative electrode sheet, and utilizes the synergistic effect between them to develop a miniature lithium primary battery.

[0013] 2. Within a limited size, the performance of existing micro batteries is improved by using a windable chromium-based metal oxide positive electrode sheet and a metal lithium negative electrode sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the discharge capacity of the wound chromium-based metal oxide miniature lithium primary battery of the present invention at 0.1C.

[0015] Figure 2 The energy density of the high energy supply micro lithium primary battery of the wound chromium-based metal oxide of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as “upper”, “middle”, “lower”, “inside”, “outside”, and “both sides” are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The high-energy-supply micro lithium primary battery cell of the wound chromium-based metal oxide of the present invention comprises a wound chromium-based metal oxide positive electrode sheet; a wound metal lithium negative electrode sheet; a high-performance micro lithium primary battery cell is manufactured by winding; finally, an electrolyte is injected into the above battery cell to form a micro high-power-supply lithium primary battery.

[0020] Furthermore, the thickness of the wound chromium-based metal oxide positive electrode sheet is 100-200 um.

[0021] Furthermore, the wound chromium-based metal oxide positive electrode sheet adopts a chromium-based metal oxide positive electrode sheet, and a blank aluminum foil of 2-10 mm is left at one end of the electrode sheet, and a blank aluminum foil of 2-20 mm is also left on the corresponding side of the blank aluminum foil.

[0022] Furthermore, the wound chromium-based metal oxide positive electrode sheet has a positive electrode lug welded on a blank aluminum foil.

[0023] Furthermore, the thickness of the wound metal lithium negative electrode is 50-150 um.

[0024] Furthermore, the wound metal lithium negative electrode is formed by pressing a copper foil at one end of the lithium negative electrode at a pressure of 0.1-10 MPa.

[0025] Furthermore, the wound metal lithium negative electrode has a negative electrode ear welded on the copper foil.

[0026] Further, the separator is first wound one circle, the positive electrode is then wound one circle, and then the negative electrode is wound one circle to form a wound unit;

[0027] Furthermore, the miniature lithium primary battery cell is composed of a plurality of wound units, and the outermost layer of the battery cell is a positive electrode sheet.

[0028] The micro-cell of the present invention is prepared by winding a chromium-based metal oxide positive electrode and a lithium metal negative electrode, and finally injecting an electrolyte to form a micro lithium primary battery, which has the advantages of small size and high output energy, so as to meet the higher demand for smart electronic products in future military wars. It can provide high energy output within a limited size and provide energy for the load.

[0029] The invention provides a high-energy-supply miniature lithium primary battery cell and battery of a wound chromium-based metal oxide, the preparation process of which is as follows:

[0030] Example 1

[0031] The thickness of the wound chromium-based metal oxide positive electrode sheet is about 100um, and a blank aluminum foil of 2mm is left at one end of the chromium-based metal oxide positive electrode sheet, and a blank aluminum foil of 10mm is also left on the corresponding side of the blank aluminum foil, and a positive electrode ear is provided on the blank aluminum foil. The thickness of the wound lithium metal negative electrode is 50um, and a copper foil is pressed at a pressure of 2MPa at one end of the lithium negative electrode, and a negative electrode ear is provided on the copper foil. First, a circle of the separator is wound, and then a circle of the negative electrode is wound, and then a circle of the positive electrode is wound to form a wound unit. The micro lithium primary battery cell is composed of multiple wound units, and the outermost layer of the battery cell is the positive electrode sheet.

[0032] Example 2

[0033] The thickness of the wound chromium-based metal oxide positive electrode sheet is about 150um, and a blank aluminum foil of 6mm is left at one end of the chromium-based metal oxide positive electrode sheet, and a blank aluminum foil of 10mm is also left on the corresponding side of the blank aluminum foil, and a positive electrode ear is provided on the blank aluminum foil. The thickness of the wound lithium metal negative electrode is 100um, and a copper foil is pressed at a pressure of 0.2MPa at one end of the lithium negative electrode, and a negative electrode ear is provided on the copper foil. First, a circle of the separator is wound, and then a circle of the negative electrode is wound, and then a circle of the positive electrode is wound to form a wound unit. The micro lithium primary battery cell is composed of multiple wound units, and the outermost layer of the battery cell is the positive electrode sheet.

[0034] Example 3

[0035] The thickness of the wound chromium-based metal oxide positive electrode sheet is about 200um, and a blank aluminum foil of 10mm is left at one end of the chromium-based metal oxide positive electrode sheet, and a blank aluminum foil of 20mm is also left on the corresponding side of the blank aluminum foil, and a positive electrode ear is provided on the blank aluminum foil. The thickness of the wound lithium metal negative electrode is 150um, and a copper foil is pressed at a pressure of 10MPa at one end of the lithium negative electrode, and a negative electrode ear is provided on the copper foil. First, a circle of the separator is wound, and then a circle of the negative electrode is wound, and then a circle of the positive electrode is wound to form a wound unit. The micro lithium primary battery cell is composed of multiple wound units, and the outermost layer of the battery cell is the positive electrode sheet.

[0036] The preparation of the battery cell and the battery needs to be carried out in a dry room with a dew point humidity lower than 1%.

[0037] Figure 1 The discharge capacity curve of the wound chromium-based metal oxide lithium primary battery at 0.1C. The volume of this battery is 0.95cm 3 , the discharge capacity reaches 170mAh. Figure 2 This is the discharge energy density curve of the wound chromium-based metal oxide lithium primary battery at 0.1C, and the discharge energy density is 550Wh / L.

[0038] So far, the disclosed embodiments of the present invention have been described in detail in conjunction with the drawings. It should be noted that the implementations not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail.

[0039] In summary, the high-energy-supply micro lithium primary cell and battery of the wound chromium-based metal oxide provided in the embodiments of the present invention innovatively propose a wound chromium-based metal oxide positive electrode sheet, a wound metal lithium negative electrode and a winding method, etc., which solves the problem that the performance of micro batteries in a limited area is low and it is difficult to support the energy supply of the equipment.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high energy supply micro lithium primary battery cell of a wound chromium-based metal oxide, characterized in that: It includes a chromium-based metal oxide positive electrode sheet, a metal lithium negative electrode sheet, a separator and an electrolyte. A miniature lithium primary battery cell consisting of multiple winding units is formed by winding. The outermost layer of the miniature lithium primary battery cell is the positive electrode sheet. The electrolyte is injected into the miniature lithium primary battery cell. The thickness of the wound chromium-based metal oxide positive electrode sheet is 100-200um, and the thickness of the wound metal lithium negative electrode is 50-150um.

2. The high energy supply micro lithium primary battery cell of the wound chromium-based metal oxide according to claim 1, characterized in that: A blank aluminum foil of 2-10 mm is left at one end of the wound chromium-based metal oxide positive electrode sheet, and a blank aluminum foil of 2-20 mm is also left on the corresponding side of the blank aluminum foil, and a positive electrode ear is welded on the blank aluminum foil.

3. The high energy supply micro lithium primary battery cell of the wound chromium-based metal oxide according to claim 1, characterized in that: A copper foil is pressed at one end of the wound metal lithium negative electrode sheet, and a negative electrode ear is welded on the copper foil.

4. The high energy supply micro lithium primary battery cell of the wound chromium-based metal oxide according to claim 3 is characterized in that: One end of the wound metal lithium negative electrode sheet is pressed with a copper foil at a pressure of 0.1-10 MPa.

5. A high energy supply miniature lithium primary battery, characterized in that: A high energy supply miniature lithium primary battery cell using the wound chromium-based metal oxide according to any one of claims 1 to 4.

Images