Graphene thermal battery

Abstract

The invention discloses a graphene thermal battery, comprising: a shell; a cover; a pair of terminals; an excitation component; an ignition component; and a battery stack, wherein the battery stack comprises a plurality of single cells, each of which comprises a negative electrode sheet, an electrolyte sheet and a positive electrode sheet, wherein each negative electrode sheet is composed of a lithiated graphene electrode, and each lithiated graphene electrode is formed by a lithiation process on a porous graphene substrate and has a plurality of pores and gaps between its graphene layers, so that a plurality of lithium ions are embedded in the gaps between its graphene layers through the electrolytes filled in the pores, thereby improving the output power of the graphene thermal battery using each lithiated graphene electrode as the negative electrode sheet, and making the electrode have stronger mechanical strength, better thermal conductivity and better electrical conductivity.

Description

Technical Field

[0001] The invention relates to a thermal battery, in particular to a graphene thermal battery using a negative electrode sheet formed by a lithiated graphene electrode. Background Art

[0002] Thermal batteries are mainly used for military purposes, such as ignition of missile fuses, and are also used as a primary power source for emergency engine start when the vehicle battery fails, especially in cold weather. This is because thermal batteries use solid electrolytes as solid batteries, which can be stored for a long time and have the advantage of not losing their storage capacity due to discharge after being placed for a period of time. After the heat source sheet of the thermal battery is instantly ignited, a certain temperature is generated, and the electrolyte turns into liquid, allowing the battery to generate power.

[0003] The negative electrode materials commonly used in the prior art for the negative electrode of the thermal battery include LiAl, LiSi alloy, etc. These negative electrodes each have their own characteristics. However, there is still a demand for making the thermal battery output higher, making the electrode mechanically stronger, having better thermal conductivity, and having better electrical conductivity.

[0004] Therefore, the inventor has started to research and develop a solution in the hope of developing a new negative electrode material to be introduced into thermal batteries to meet the above requirements. Summary of the invention

[0005] The object of the present invention is to provide a graphene thermal battery, which can achieve the requirements of higher thermal battery output power, stronger electrode mechanical strength, better thermal conductivity and better electrical conductivity.

[0006] In order to achieve the above-mentioned purpose, the technical means adopted by the present invention are as follows:

[0007] A graphene thermal battery, comprising:

[0008] a housing;

[0009] A cover body, which covers the shell and forms an internal space with the shell; a pair of terminals, which are connected to the internal space and pass through the cover body, serving as terminals for inputting power when the graphene thermal battery is activated, and as terminals for outputting power after the graphene thermal battery is activated; an excitation component, which is arranged in the internal space and electrically connected to the pair of terminals; an ignition component, which is arranged in the internal space and adjacent to the excitation component, and is used for ignition by the excitation component when the graphene thermal battery is activated and requires heat; and a battery stack, which is arranged in the internal space, electrically connected to the pair of terminals, and adjacent to the ignition component, and the battery stack includes a plurality of monomers A battery, wherein each single cell comprises a negative electrode sheet, an electrolyte sheet and a positive electrode sheet, wherein each negative electrode sheet is composed of a lithiated graphene electrode, and each lithiated graphene electrode is formed by a lithiation process on a porous graphene substrate having a plurality of pores, and the porous graphene substrate comprises multilayer graphene; wherein each lithiated graphene electrode has a plurality of pores and there are gaps between its graphene layers, so that the electrolyte sheet ignites the electrolyte after heating and liquefaction and fills the pores, and a plurality of lithium ions are embedded in the gaps between the graphene layers through the electrolyte filled in the plurality of pores, so that the output power of the graphene thermal battery using each lithiated graphene electrode as the negative electrode sheet can be improved.

[0010] The aforementioned structure, wherein the porous graphene substrate is composed of a porous substrate having a plurality of pores, and a high-purity porous graphene layer is covered around the periphery of the pores of the porous substrate.

[0011] In the aforementioned structure, the porous substrate is selected from one of the following: a porous carbon substrate, a porous graphite substrate, and a porous metal substrate, but the present invention is not limited thereto.

[0012] In the above structure, each single cell further comprises a heat plate, and each heat plate provides heat for each single cell.

[0013] In the aforementioned structure, the pair of terminals also serve as the excitation component for igniting the ignition component, and replace or serve as the setting of the excitation component.

[0014] In the above-mentioned structure, a thermal insulation layer is arranged around the battery stack, and the thermal insulation layer is used to reduce the heat loss of the graphene thermal battery to extend the working time of the graphene thermal battery.

[0015] In the aforementioned structure, the thermal insulation layer is selected from one of the following: natural mica, artificial mica, aluminum silicate fiber, asbestos paper and thermal insulation material, but the present invention is not limited thereto. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the structure of the graphene thermal battery of the present invention;

[0017] Figure 2 It is a schematic structural diagram of a single cell of the present invention;

[0018] Figure 3A is a schematic diagram of a porous substrate of the present invention;

[0019] Figure 3B It is a partial enlarged view of the porous substrate of the present invention;

[0020] Figure 3C It is a partial enlarged view of the porous graphene substrate of the present invention;

[0021] Figure 4 FIG. 1 is a schematic structural diagram of another embodiment of a single cell of the present invention.

[0022] Main component symbols:

[0023] Pore ​​205

[0024] Graphene Thermal Battery 200

[0025] Housing 210

[0026] Cover 220

[0027] Terminal 230

[0028] Excitation component 240

[0029] Battery stack 250

[0030] Single battery 260

[0031] Negative electrode sheet 261

[0032] Electrolyte sheet 262

[0033] Positive electrode sheet 263

[0034] Hot film 264

[0035] Porous graphene substrate 266

[0036] Porous substrate 267

[0037] High purity porous graphene layer 268

[0038] Insulation layer 270

[0039] Internal space 280

[0040] Ignition assembly 290 DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to have a better understanding and recognition of the technology, method features and effects achieved by the present invention, preferred embodiment diagrams and detailed descriptions are provided as follows.

[0042] See also Figure 1-4 , which is a preferred embodiment of the graphene thermal battery of the present invention. These figures are schematic diagrams for convenient explanation, which only illustrate the basic structure of the present invention in a schematic way, and the displayed composition drawing is not limited to the same shape and size ratio in actual implementation. The shape and size ratio in actual implementation is a selective design.

[0043] like Figure 1 As shown, the present invention provides a graphene thermal battery 200 structure, which includes:

[0044] A housing 210 , which serves as an outer shell structure of the graphene thermal battery 200 ;

[0045] A cover 220, which covers the housing 210 and forms an inner space 280 with the housing;

[0046] A pair of terminals 230, which are connected to the internal space and pass through the cover 220, and are used as the terminals 230 for inputting power when the graphene thermal battery 200 is activated, and as the terminals 230 for outputting power after the graphene thermal battery 200 is activated;

[0047] an excitation component 240, the excitation component 240 is disposed in the internal space 280 and electrically connected to the pair of terminals 230;

[0048] an ignition assembly 290, which is disposed in the inner space 280 and adjacent to the excitation assembly 240, and is used to be ignited by the excitation assembly 240 when the graphene thermal battery 200 is activated and requires heat; and

[0049] A battery stack 250 is disposed in the inner space 280 , electrically connected to the pair of terminals 230 , and adjacent to the ignition assembly 290 . The battery stack 250 includes a plurality of single batteries 260 .

[0050] like Figure 2 As shown, each single cell 260 includes a negative electrode sheet 261, an electrolyte sheet 262 and a positive electrode sheet 263. Each negative electrode sheet 261 is composed of a lithiated graphene electrode. Each lithiated graphene electrode is formed by a lithiation process of a porous graphene substrate 266 having multiple pores. The porous graphene substrate 266 includes multiple layers of graphene.

[0051] Each of the lithiated graphene electrodes has a plurality of pores and gaps between its graphene layers, so that the electrolyte sheet 262 is ignited, heated, and liquefied and the electrolyte is filled in the pores. A plurality of lithium ions are embedded in the gaps between its graphene layers through the electrolyte filled in the plurality of pores, thereby increasing the output power of the graphene thermal battery 200 using each lithiated graphene electrode as a negative electrode sheet.

[0052] In addition, the present invention uses a lithiated graphene electrode as the negative electrode sheet 261 of the single cell 260 of the graphene thermal battery 200, replacing the prior art use of Li / Si as the negative electrode of the thermal battery. In this way, the negative electrode sheet 261 of the present invention, in addition to improving the output power of the graphene thermal battery 200, also has the advantages of making the negative electrode sheet 261 stronger in mechanical strength, better in thermal conductivity, and better in electrical conductivity.

[0053] Among them, each of the above-mentioned lithiated graphene electrodes is formed by a lithiation process on a porous graphene substrate 266 having multiple pores, and there are gaps between the graphene layers in the porous graphene substrate 266, and the electrolyte is filled in the pores. The lithiation means that multiple lithium ions are embedded in the gaps between the graphene layers through the electrolyte filled in the pores, which facilitates the reaction of lithium ion deintercalation during discharge and lithium ion insertion during charging when it is a negative electrode. The present invention does not limit the lithiation method, and existing lithiation methods can be applied.

[0054] like Figure 3B , 3C As shown, the porous graphene substrate 266 is composed of a porous substrate 267 having a plurality of pores 205, and a high-purity porous graphene layer 268 covering the periphery of the pores 205 of the porous substrate 267. Figure 3A As shown, it is a schematic diagram of the porous substrate 267; Figure 3B , which is a partial enlarged view of the porous substrate 267, showing that there are countless pores 205 in the porous substrate 267; Figure 3C , which is a partial enlarged view of the porous graphene substrate 266 , showing that the periphery of the plurality of pores 205 of the porous graphene substrate 266 is covered with a high-purity porous graphene layer 268 .

[0055] The method of forming a high-purity porous graphene layer 268 around the plurality of pores 205 of a porous substrate 267 is not limited in the present invention, and includes mechanical exfoliation, epitaxial growth, chemical vapor deposition (CVD), chemical exfoliation, electrochemical exfoliation, and laser irradiation of polyimide (PI) to form porous graphene (Laser induced grapheme) and the like.

[0056] Among them, the porous substrate 267 can be selected from one of the following: a porous carbon substrate, a porous graphite, a porous metal substrate, but the present invention is not limited thereto. As long as it is a substrate with multiple pores and can maintain the porous characteristics until the negative electrode sheet 261 of the subsequent single cell 260 is formed, the output power of the graphene thermal battery 200 can be increased.

[0057] The pair of terminals 230 may also serve as the ignition component 240 for igniting the ignition component 290 , and may replace or serve as a setting for the ignition component 240 .

[0058] like Figure 4 As shown, each single battery 260 further includes a heat sheet 264 , and each heat sheet 264 provides heat to each single battery 260 .

[0059] A heat preservation layer 270 is disposed around the battery stack 250 , and the heat preservation layer 270 is used to reduce the heat loss of the graphene thermal battery 200 to extend the working time of the graphene thermal battery 200 .

[0060] The thermal insulation layer 270 can be selected from one of the following: natural mica, artificial mica, aluminum silicate fiber, asbestos paper and thermal insulation material, but the present invention is not limited thereto, and any material having thermal insulation effect can be used.

[0061] The graphene thermal battery structure of the present invention is designed through the above-mentioned structure, using the lithiated graphene electrode as the negative electrode sheet 261 of the single cell 260 of the graphene thermal battery 200, which can improve the output power of the graphene thermal battery 200 and also has the advantages of stronger mechanical strength, stronger thermal conductivity, and better electrical conductivity, so that the application of the present invention can achieve excellent economic benefits.

[0062] The above-described contents are only preferred embodiments of the present invention. Any changes extended by the technical means of the present invention should fall within the protection scope of the present invention.

Claims

1. A graphene thermal battery, It is characterized in that include: a housing; a cover body, which covers the shell and forms an inner space with the shell; A pair of terminals, connected to the internal space and passing through the cover, serving as terminals for inputting power when the graphene thermal battery is activated, and terminals for outputting power after the graphene thermal battery is activated; an excitation component, which is disposed in the internal space and electrically connected to the pair of terminals; An ignition component is disposed in the internal space and adjacent to the excitation component, and is used to be ignited by the excitation component when the graphene thermal battery is activated and requires heat; as well as A battery stack is disposed in the internal space, electrically connected to the pair of terminals, and adjacent to the ignition assembly, the battery stack comprising a plurality of single cells, each of which comprises a negative electrode sheet, an electrolyte sheet, and a positive electrode sheet, each of which is composed of a lithiated graphene electrode, each of which is formed by a lithiation process of a porous graphene substrate having a plurality of pores; wherein the porous graphene substrate is composed of a porous substrate having a plurality of pores, and a high-purity porous graphene layer is covered on the periphery of the pores of the porous substrate; the porous substrate is selected from one of the following: a porous carbon substrate, a porous graphite, and a porous metal substrate; Among them, each lithiated graphene electrode has multiple pores and gaps between its graphene layers, so that the electrolyte sheet ignites the heated and liquefied electrolyte and fills the pores. Multiple lithium ions are embedded in the gaps between the graphene layers through the electrolyte filled in the multiple pores, thereby improving the output power of the graphene thermal battery using each lithiated graphene electrode as the negative electrode sheet.

2. A graphene thermal battery as claimed in claim 1, It is characterized in that Each of the single cells further comprises a heat plate, and each of the heat plates provides heat for each of the single cells.

3. A graphene thermal battery as claimed in claim 1, It is characterized in that The pair of terminals also serve as the excitation component for igniting the ignition component, and replace or serve as the setting of the excitation component.

4. A graphene thermal battery as claimed in claim 1, It is characterized in that A heat preservation layer is arranged around the battery stack to reduce the heat loss of the graphene thermal battery so as to extend the working time of the graphene thermal battery.

5. A graphene thermal battery as claimed in claim 4, It is characterized in that The thermal insulation layer is selected from one of the following: natural mica, artificial mica, aluminum silicate fiber, and asbestos paper.

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