Fixed type heating device of internal serial box type graphitization furnace

Abstract

The utility model discloses a fixed heating device of an internal serial box type graphitization furnace, and belongs to the technical field of lithium battery material production. The graphitization furnace comprises a furnace box and a conductive structure penetrating through the whole furnace box, the conductive structure comprises first conductive strips, second conductive strips and cushion blocks, the cross section of each first conductive strip is an isosceles trapezoid, the cross section of each second conductive strip is a right trapezoid, and a plurality of first trapezoid slopes are attached end to end to form a row; a cushion block is connected right below the joint of the two conductive strips by using an adhesive; the conductive structures are arranged in a plurality of columns, each column is provided with a plurality of layers, the cushion blocks of the first layer of conductive structures are adhered to the bottom of the furnace box through adhesives, and then the cushion blocks of each layer are adhered to the top faces of the conductive strips through adhesives. The graphitization furnace can avoid large explosion danger, and is low in construction cost, high in productivity and suitable for popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery material production, and specifically relates to a fixed heating device for an inner-box graphitization furnace. Background Art

[0002] With the widespread application of lithium-ion batteries in electric vehicles and energy storage, the lithium battery industry continues to develop at a high speed, and higher requirements are placed on the graphitization of negative electrode materials. There are different types of heating and conductive devices used in existing graphitization furnaces. Graphitization furnaces using single strip heating and conductive devices have small furnace loads and low production efficiency; graphitization furnaces using flat heating and conductive devices do not heat all raw materials sufficiently and cannot meet the requirements of downstream industries for negative electrode materials; conductive heating devices with multiple conductive strips spliced ​​together will cause current to not pass normally during the graphitization process due to expansion and contraction problems, resulting in safety issues such as furnace spraying or even explosions. How to provide greater production capacity, lower costs, more uniform performance and a safer production environment for the manufacture of negative electrode materials, and how to better adapt to the global high environmental standards are the directions for the graphitization industry to continuously adapt to industry development and continue to improve. Utility Model Content

[0003] The utility model aims to provide an internal series box type graphitization furnace fixed heating device, which has the characteristics of large production capacity, low manufacturing cost and high safety performance.

[0004] The fixed heating device of the inner-box graphitization furnace is characterized in that it includes a furnace box and a conductive structure running through the entire furnace box, wherein the conductive structure includes a first conductive strip, a second conductive strip and a pad, the cross section of the first conductive strip is an isosceles trapezoid, the cross section of the second conductive strip is a right-angled trapezoid, a plurality of first trapezoidal inclined surfaces are closely contacted and fitted to form a row, closely contacted and fitted to the inclined surfaces of the second conductive strips at both ends, and the vertical surfaces of the second conductive strips are closely contacted and fitted to the end plate of the furnace box, and the pads are connected with an adhesive directly below the junction of the two conductive strips; the conductive structure is arranged in a plurality of columns, each column is arranged in a plurality of layers, the spacing between the conductive structures in each column and the spacing between the conductive structures and the side of the furnace box are equal, the pads of the first layer of the conductive structure are adhered to the bottom of the furnace box by an adhesive, and thereafter the pads of each layer are adhered to the top surface of the conductive strip by an adhesive.

[0005] Furthermore, when there are gaps between the first conductive strips and between the first conductive strips and the second conductive strips, the gaps are filled with graphite pads or graphite paper.

[0006] Furthermore, a graphite pad is filled in the gap between the second conductive strip and the furnace box end plate.

[0007] Preferably, the angle α between the first conductive strip and the second conductive strip is 30°-70°.

[0008] Preferably, the binder is pure syrup.

[0009] Preferably, the conductive structure is arranged in two columns and three layers.

[0010] The beneficial effects of the utility model are as follows: the conductive strips are attached to each other through the inclined contact, which can not only increase the conductive area, but also prevent the problem of easy shrinkage and tipping caused by direct contact, avoiding the risk of explosion in serious cases; the angle of the conductive strip can solve the expansion and contraction problem during the graphitization process, ensuring the normal passage of current during the process, thereby effectively avoiding furnace spraying accidents caused by arcing or arcing. In addition, the device has a large furnace capacity, a larger contact area with the raw materials, more uniform heating, and can produce more negative electrode materials that meet the requirements of downstream products, which can reduce production costs and increase production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the fixed heating device of the inner-box graphitization furnace.

[0012] Figure 2 Schematic diagram of the conductive structure.

[0013] Among them: 1-furnace box, 2-conductive structure, 3-first conductive bar, 4-second conductive bar, 5-pad. DETAILED DESCRIPTION

[0014] Embodiment 1: A fixed heating device for an inner-box graphitization furnace comprises a furnace box 1 and a conductive structure 2 that runs through the entire furnace box, wherein the conductive structure 2 comprises a first conductive strip 3, a second conductive strip 4 and a pad 5, wherein the cross section of the first conductive strip 3 is an isosceles trapezoid, and the cross section of the second conductive strip 4 is a right-angle trapezoid, and the α angle between the first conductive strip and the second conductive strip is 45°. A plurality of first trapezoidal inclined surfaces are closely contacted and bonded to form a row, and when there is a gap at the bonding point between adjacent first conductive strips 3, a graphite pad or graphite paper is used to fill the gap; at both ends of the conductive structure, the inclined surface of the first conductive strip 3 is closely contacted and bonded to the inclined surface of the second conductive strip 4, and the gap at the bonding point is filled with a graphite pad or graphite paper, and the vertical surface of the second conductive strip 4 is closely contacted and bonded to the end plate of the furnace box 1, and a graphite pad is filled in the gap. Pure syrup is used to bond the pad 5 directly below the junction of the two conductive strips. The conductive structure 2 is arranged in two rows, and each row is arranged in three layers. The spacing between the conductive structures 2 in each row and the spacing between the conductive structures and the sides of the furnace box 1 are equal. The pads 5 of the first layer of the conductive structure 2 are glued to the bottom of the furnace box 1 by pure syrup, and the pads 5 of the upper two layers are glued to the top surface of the conductive strips of the lower layer by pure syrup.

[0015] Embodiment 2: A fixed heating device for an inner-box graphitization furnace comprises a furnace box 1 and a conductive structure 2 that runs through the entire furnace box, wherein the conductive structure 2 comprises a first conductive strip 3, a second conductive strip 4 and a pad 5, the cross section of the first conductive strip 3 is an isosceles trapezoid, the cross section of the second conductive strip 4 is a right-angle trapezoid, the α angle of the first conductive strip and the second conductive strip is 60°, and when the α angle is 60°, the number of times the two conductive strips are used is increased. A plurality of first trapezoidal inclined surfaces are closely contacted and bonded to form a row, and when there is a gap at the bonding point between adjacent first conductive strips 3, a graphite pad or graphite paper is used to fill the gap; at both ends of the conductive structure, the inclined surface of the first conductive strip 3 is closely contacted and bonded to the inclined surface of the second conductive strip 4, and the gap at the bonding point is filled with a graphite pad or graphite paper, and the vertical surface of the second conductive strip 4 is closely contacted and bonded to the end plate of the furnace box 1, and a graphite pad is filled in the gap. Pure syrup is used to bond the pad 5 directly below the junction of the two conductive strips. The conductive structure 2 is arranged in two rows, and each row is arranged in three layers. The spacing between the conductive structures 2 in each row and the spacing between the conductive structures and the sides of the furnace box 1 are equal. The pads 5 of the first layer of the conductive structure 2 are glued to the bottom of the furnace box 1 by pure syrup, and the pads 5 of the upper two layers are glued to the top surface of the conductive strips of the lower layer by pure syrup.

Claims

1. The fixed heating device of the inner box graphitization furnace is characterized by It comprises a furnace box and a conductive structure that runs through the entire furnace box, wherein the conductive structure comprises a first conductive strip, a second conductive strip and a pad. The cross section of the first conductive strip is an isosceles trapezoid, the cross section of the second conductive strip is a right-angled trapezoid, a plurality of first trapezoidal inclined surfaces are closely contacted and fitted to form a row, closely contacted and fitted to the inclined surfaces of the second conductive strips at both ends, and the vertical surfaces of the second conductive strips are closely contacted and fitted to the end plate of the furnace box, and the pads are connected with an adhesive just below the junction of the two conductive strips; the conductive structure is arranged in a plurality of rows, each row is arranged in a plurality of layers, the spacing between the conductive structures in each row and the spacing between the conductive structures and the sides of the furnace box are equal, the pads of the first layer of the conductive structure are adhered to the bottom of the furnace box by an adhesive, and thereafter the pads of each layer are adhered to the top surface of the conductive strips by an adhesive.

2. The fixed heating device for the inner-box graphitization furnace according to claim 1, characterized in that The gaps between the adjacent first conductive strips and the adjacent first conductive strips and the second conductive strips are filled with graphite pads or graphite paper.

3. The fixed heating device for the inner-box graphitization furnace according to claim 1, characterized in that The gap between the second conductive strip and the end plate of the furnace box is filled with graphite pads.

4. The fixed heating device for the inner-box graphitization furnace according to claim 1, characterized in that The angle α between the first conductive strip and the second conductive strip is 30°-70°.

5. The fixed heating device for the inner-box graphitization furnace according to claim 1, characterized in that The binder is pure syrup.

6. The fixed heating device for the inner-box graphitization furnace according to claim 1, characterized in that The conductive structure is arranged in two rows and three layers.

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