A lithium iron phosphate sintering device

Abstract

The utility model discloses a lithium iron phosphate sintering device, including base, sintering furnace, cooling device, heating device and unloading device, is provided with support frame on the base, and the sintering furnace sets up on the support frame, and the top of sintering furnace is provided with inlet valve, and is provided with the baffle in sintering furnace, and the baffle divides sintering furnace and separates into sintering area and cooling area, and the bottom of sintering area is the curved surface recessed to the middle part, and is provided with cooling cavity in cooling area, and the bottom of sintering area is communicated with cooling cavity through the discharge pipe, and is provided with control valve on the discharge pipe, and the cooling cavity and cooling area form the cooling flow channel between, and cooling device sets up on the base for the circulation cooling liquid into the cooling flow channel, and heating device includes a plurality of heating parts, and heating part sets up in sintering area for heating sintering area, and unloading device is connected with the bottom of cooling cavity to collect the lithium iron phosphate after cooling.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular, to a lithium iron phosphate sintering apparatus. Background Technology

[0002] Lithium iron phosphate (LFP) is considered an ideal material for lithium-ion batteries due to its low price, high safety, lack of environmental pollution, large specific capacity, and good cycle performance. In existing technologies, LFP is typically prepared in a sintering furnace with inert gas protection, undergoing a high-temperature calcination reaction to obtain LFP.

[0003] Currently, existing sintering furnaces are usually horizontal. After sintering, the furnace needs to be tilted to discharge the sintered lithium iron phosphate from the outlet. Secondly, existing sintering furnaces usually use natural cooling, which is slow, affecting processing efficiency and increasing production costs. Utility Model Content

[0004] This invention provides a lithium iron phosphate sintering device to simultaneously solve the technical problems of difficult discharge of sintered lithium iron phosphate and slow cooling rate.

[0005] A lithium iron phosphate sintering apparatus according to this utility model includes a base, a sintering furnace, a cooling device, a heating device, and a discharge device. A support frame is mounted on the base, and the sintering furnace is mounted on the support frame. A feed valve is located at the top of the sintering furnace. A partition is installed inside the sintering furnace, dividing the interior into a sintering zone and a cooling zone. The bottom of the sintering zone has a concave curved surface. A cooling chamber is provided within the cooling zone. The bottom of the sintering zone is connected to the cooling chamber via a discharge pipe, which is equipped with a control valve. A cooling channel is formed between the cooling chamber and the cooling zone. The cooling device is mounted on the base for circulating coolant into the cooling channel. The heating device includes several heating elements, which are located within the sintering zone for heating the sintering zone. The discharge device is connected to the bottom of the cooling chamber to collect the cooled lithium iron phosphate.

[0006] Furthermore, the sintering zone includes an outer furnace and an inner furnace, the outer furnace and the inner furnace are spaced apart to form a heating zone, the inner furnace is connected to the feed valve to accommodate lithium iron phosphate, and the heating elements are spaced apart within the heating zone.

[0007] Furthermore, the cooling device includes an inlet pipe, an outlet pipe, a circulating water tank, and a water pump. The circulating water tank is mounted on the base. The inlet pipe is detachably connected to the cooling channel, and the outlet pipe is detachably connected to the cooling channel. The water pump is mounted on the circulating water tank to inject cooling water into the cooling channel.

[0008] Furthermore, the circulating water tank is equipped with a condenser for cooling the cooling water.

[0009] Furthermore, the unloading device includes an unloading pipe, an unloading box, and a negative pressure machine. The unloading pipe is connected to the cooling chamber and is equipped with a valve. The unloading box is mounted on the base. The negative pressure machine is mounted on the unloading box and its output end is connected to the unloading box. The two ends of the unloading pipe are respectively connected to the cooling chamber and the negative pressure machine.

[0010] Furthermore, the support frame includes a first bracket and a second bracket, and the two ends of the sintering furnace are rotatably connected to the first bracket and the second bracket, respectively.

[0011] Furthermore, a drive motor is provided on the first support, which is used to drive the sintering furnace to rotate circumferentially.

[0012] Furthermore, casters are provided at the bottom of the base.

[0013] Furthermore, the discharge pipe is a high-temperature resistant corrugated pipe.

[0014] Furthermore, the heating element is a silicon carbide heating rod.

[0015] This utility model has the following beneficial effects:

[0016] In this utility model's lithium iron phosphate sintering apparatus, the sintering and cooling of lithium iron phosphate are completed stepwise by setting up a sintering zone and a cooling zone inside the sintering furnace. Specifically, the feed valve is opened, and the lithium iron phosphate to be sintered is first placed into the sintering zone. Then, the feed valve is closed, and the heating device is turned on to heat the sintering zone, thereby causing the lithium iron phosphate to react and sinter. After the lithium iron phosphate in the sintering zone has reacted and sintered, the control valve is opened. Because the bottom of the sintering zone is a concave curved surface towards the center, the sintered lithium iron phosphate enters the cooling chamber through the discharge pipe under the influence of gravity. At the same time, the cooling device is turned on to circulate coolant into the cooling channel, thereby absorbing and exchanging heat in the cooling chamber located in the cooling channel. After the lithium iron phosphate has cooled, it is unloaded from the cooling chamber by the unloading device. In this apparatus, the special curved sintering zone facilitates the automatic unloading of the sintered lithium iron phosphate to the cooling chamber for cooling, and then the unloading device unloads it. This device facilitates the cooling and unloading of sintered lithium iron phosphate, thereby improving processing efficiency and reducing cost waste.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding 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 undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the lithium iron phosphate sintering apparatus according to a preferred embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the lithium iron phosphate sintering apparatus according to a preferred embodiment of the present invention.

[0021] Legend:

[0022] 100. Base; 101. First support; 102. Second support; 103. Casters;

[0023] 200. Sintering furnace; 201. Feed valve; 202. Baffle plate; 203. Sintering zone; 204. Cooling zone; 205. Cooling chamber; 206. Cooling channel; 207. Outer furnace; 208. Inner furnace; 209. Heating element;

[0024] 300. Inlet pipe; 301. Outlet pipe; 302. Circulating water tank; 303. Water pump; 304. Condenser;

[0025] 400. Unloading pipe; 401. Unloading box; 402. Negative pressure unit;

[0026] 500. Drive motor. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] like Figures 1-2As shown, this utility model discloses a lithium iron phosphate sintering apparatus, including a base 100, a sintering furnace 200, a cooling device, a heating device, and a unloading device. A support frame is mounted on the base 100, and the sintering furnace 200 is mounted on the support frame. A feed valve 201 is provided on the top of the sintering furnace 200. A partition 202 is provided inside the sintering furnace 200, dividing the interior of the sintering furnace 200 into a sintering zone 203 and a cooling zone 204. The bottom of the sintering zone 203 has a concave curved surface towards the center. A cooling device is provided in the cooling zone 204. The cooling chamber 205 is connected to the bottom of the sintering zone 203 via a discharge pipe. A control valve is installed on the discharge pipe. A cooling channel 206 is formed between the cooling chamber 205 and the cooling zone 204. The cooling device is installed on the base 100 to circulate coolant into the cooling channel 206. The heating device includes several heating elements 209, which are installed in the sintering zone 203 to heat the sintering zone 203. The unloading device is connected to the bottom of the cooling chamber 205 to collect the cooled lithium iron phosphate.

[0029] In this embodiment, the sintering and cooling of lithium iron phosphate are completed in steps by setting a sintering zone 203 and a cooling zone 204 inside the sintering furnace 200. Specifically, the feed valve 201 is opened, and the lithium iron phosphate to be sintered is first placed into the sintering zone 203. Then the feed valve 201 is closed, and the heating device is turned on to heat the sintering zone 203, thereby causing the lithium iron phosphate to react and sinter. After the lithium iron phosphate in the sintering zone 203 has reacted and sintered, the control valve is opened. Since the bottom of the sintering zone 203 is a concave curved surface, the sintered lithium iron phosphate enters the cooling chamber 205 through the discharge pipe under the influence of gravity. At the same time, the cooling device is turned on to circulate coolant into the cooling channel 206, thereby absorbing and exchanging heat in the cooling chamber 205 located in the cooling channel 206. After the lithium iron phosphate is cooled, the lithium iron phosphate in the cooling chamber 205 is unloaded through the unloading device. In this device, the sintered lithium iron phosphate is automatically unloaded into the cooling chamber 205 for cooling via a special curved sintering zone 203, and then unloaded by the unloading device. This device facilitates the cooling and unloading of the sintered lithium iron phosphate, thereby improving processing efficiency and reducing waste.

[0030] Furthermore, the sintering zone 203 includes an outer furnace 207 and an inner furnace 208. The outer furnace 207 and the inner furnace 208 are spaced apart to form a heating zone. The inner furnace 208 is connected to the feed valve 201 to accommodate lithium iron phosphate. The heating elements 209 are spaced apart within the heating zone.

[0031] In this embodiment, the sintering zone 203 includes an outer furnace 207 and an inner furnace 208. The outer furnace 207 and the inner furnace 208 are spaced apart and form a heating zone. The heating element 209 is installed in the heating zone to heat the inner furnace 208.

[0032] Furthermore, the cooling device includes an inlet pipe 300, an outlet pipe 301, a circulating water tank 302, and a water pump 303. The circulating water tank 302 is mounted on the base 100. The inlet pipe 300 is detachably connected to the cooling channel 206, and the outlet pipe 301 is detachably connected to the cooling channel 206. The water pump 303 is mounted on the circulating water tank 302 to inject cooling water into the cooling channel 206. In this embodiment, the cooling device, under the action of the water pump 303, injects coolant into the cooling channel 206. Specifically, the coolant is injected into the cooling channel 206 through the inlet pipe and then flows out through the outlet pipe 301 into the circulating water tank 302. It should be noted that both the outlet pipe 301 and the inlet pipe 300 are detachably connected to the cooling channel 206.

[0033] Furthermore, a condenser 304 for cooling the cooling water is provided inside the circulating water tank 302. In this embodiment, the condenser 304 inside the circulating water tank 302 can cool the coolant inside the circulating water tank 302, thereby ensuring that the coolant entering the cooling channel 206 is always kept at a low temperature, thus guaranteeing the cooling effect in the cooling chamber 205.

[0034] Further, the unloading device includes an unloading pipe 400, an unloading box 401, and a negative pressure unit 402. The unloading pipe 400 is connected to the cooling chamber 205 and is equipped with a valve. The unloading box 401 is mounted on the base 100, and the negative pressure unit 402 is mounted on the unloading box 401 with its output end connected to the unloading box 401. The two ends of the unloading pipe 400 are connected to the cooling chamber 205 and the negative pressure unit 402, respectively. In this embodiment, the negative pressure unit 402 can create negative pressure to extract lithium iron phosphate from the cooling chamber 205, allowing the lithium iron phosphate to enter the unloading box 401 for collection through the unloading pipe 400.

[0035] Furthermore, the support frame includes a first support 101 and a second support 102, and both ends of the sintering furnace 200 are rotatably connected to the first support 101 and the second support 102, respectively. In this embodiment, the sintering furnace 200 is configured to be rotatable, which ensures uniform heating of the lithium iron phosphate during sintering. Furthermore, the reciprocating oscillation of the sintering furnace 200 causes the reactants within it to tumble repeatedly, keeping the reactants in constant motion, resulting in more thorough mixing, increased contact area, and improved reaction sufficiency.

[0036] Furthermore, a drive motor 500 is provided on the first support 101, and the drive motor 500 is used to drive the sintering furnace 200 to rotate circumferentially. In this embodiment, the drive motor 500 is a stepper motor, which can automatically reciprocate the sintering furnace 200. When using the drive motor 500, it is necessary to disconnect the connection with the water inlet pipe 300 and the water outlet pipe 301 in the cooling device, as well as the connection with the unloading pipe 400 in the unloading device, so that the sintering furnace 200 can rotate a full circle.

[0037] Furthermore, casters 103 are provided at the bottom of the base 100. In this embodiment, providing casters 103 on the base 100 facilitates the movement and transfer of the equipment, making equipment handling convenient.

[0038] Furthermore, the discharge pipe is a high-temperature resistant corrugated pipe. Using a high-temperature resistant corrugated pipe allows the elastic deformation of its corrugated structure to absorb axial, lateral, or angular displacements caused by temperature changes in the pipe, thus preventing cracking due to thermal stress.

[0039] Furthermore, the heating element 209 is a silicon carbide heating rod. In this embodiment, the use of a silicon carbide heating rod has advantages such as high temperature resistance, high thermal efficiency, easy installation, uniform heating, fast heating speed, and long service life.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lithium iron phosphate sintering apparatus, characterized in that, include: Base (100); A sintering furnace (200) is provided on a support frame on a base (100). The sintering furnace (200) is mounted on the support frame. A feed valve (201) is provided on the top of the sintering furnace (200). A partition (202) is provided inside the sintering furnace (200). The partition (202) divides the interior of the sintering furnace (200) into a sintering zone (203) and a cooling zone (204). The bottom of the sintering zone (203) is a curved surface that is concave towards the center. A cooling chamber (205) is provided inside the cooling zone (204). The bottom of the sintering zone (203) is connected to the cooling chamber (205) through a discharge pipe. A control valve is provided on the discharge pipe. A cooling channel (206) is formed between the cooling chamber (205) and the cooling zone (204). A cooling device, which is mounted on a base (100) for circulating coolant into a cooling channel (206); A heating device, comprising a plurality of heating elements (209), wherein the heating elements (209) are disposed within the sintering zone (203) for heating the sintering zone (203); A discharge device is connected to the bottom of the cooling chamber (205) to collect cooled lithium iron phosphate.

2. The lithium iron phosphate sintering apparatus according to claim 1, characterized in that, The sintering zone (203) includes an outer furnace (207) and an inner furnace (208). The outer furnace (207) and the inner furnace (208) are spaced apart and form a heating zone. The inner furnace (208) is connected to the feed valve (201) to accommodate lithium iron phosphate. The heating elements (209) are spaced apart in the heating zone.

3. The lithium iron phosphate sintering apparatus according to claim 2, characterized in that, The cooling device includes an inlet pipe (300), an outlet pipe (301), a circulating water tank (302), and a water pump (303). The circulating water tank (302) is mounted on the base (100). The inlet pipe (300) is detachably connected to the cooling channel (206). The outlet pipe (301) is detachably connected to the cooling channel (206). The water pump (303) is mounted on the circulating water tank (302) to inject cooling water into the cooling channel (206).

4. The lithium iron phosphate sintering apparatus according to claim 3, characterized in that, The circulating water tank (302) is equipped with a condenser (304) for cooling the cooling water.

5. The lithium iron phosphate sintering apparatus according to claim 3, characterized in that, The unloading device includes an unloading pipe (400), an unloading box (401), and a negative pressure machine (402). The unloading pipe (400) is connected to the cooling chamber (205), and a valve is provided on the unloading pipe (400). The unloading box (401) is set on the base (100), and the negative pressure machine (402) is set on the unloading box (401) and the output end of the negative pressure machine (402) is connected to the unloading box (401). The two ends of the unloading pipe (400) are respectively connected to the cooling chamber (205) and the negative pressure machine (402).

6. The lithium iron phosphate sintering apparatus according to claim 5, characterized in that, The support frame includes a first bracket (101) and a second bracket (102), and the two ends of the sintering furnace (200) are rotatably connected to the first bracket (101) and the second bracket (102) respectively.

7. The lithium iron phosphate sintering apparatus according to claim 6, characterized in that, A drive motor (500) is provided on the first support (101), and the drive motor (500) is used to drive the sintering furnace (200) to rotate circumferentially.

8. The lithium iron phosphate sintering apparatus according to any one of claims 1 to 7, characterized in that, The base (100) is equipped with casters (103) at its bottom.

9. The lithium iron phosphate sintering apparatus according to any one of claims 1 to 7, characterized in that, The discharge pipe is a high-temperature resistant corrugated pipe.

10. The lithium iron phosphate sintering apparatus according to any one of claims 1 to 7, characterized in that, The heating element (209) is a silicon carbide heating rod.

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