Trolley calcining kiln system for large-scale production of lithium battery positive electrode material

Abstract

A trolley roasting kiln system for large-scale production of lithium battery positive electrode materials comprises a kiln shell, a conveying rail, a trolley, a silicon carbon electrical bar, a first pushing device, a second pushing device, a third pushing device and a fourth pushing device. The conveying rail comprises a kiln inner rail arranged in the kiln shell and a kiln outer rail arranged outside the kiln shell. The trolley is arranged on the transportation track and can move along the transportation track. And the silicon carbon electrical bar is arranged in the kiln shell and is positioned above the trolley. The first pushing device is used for pushing the trolley to move along the in-kiln track. The second pushing device is used for pushing the trolley to move from the in-kiln track to the out-kiln track. The third pushing device is used for pushing the trolley to move along the out-kiln rail. And the fourth pushing device is used for pushing the trolley to move from the outside-kiln track to the inside-kiln track. Air inlets and outlets are formed in the top of the kiln shell. According to the utility model, a trolley type conveying structure which is circularly and rotatably used is adopted, so that the large-scale production of the lithium battery positive electrode material can be realized, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to equipment for the production or firing of lithium battery cathode materials, specifically to a large-scale trolley-type calcining kiln system for producing lithium battery cathode materials, belonging to the field of lithium battery cathode material production technology. Background Technology

[0002] With the development of my country's economy and technology, new energy technologies have advanced rapidly, especially the development of new energy vehicles, leading to a continuous increase in the demand for lithium batteries. The cathode material of lithium batteries is the most crucial material determining the capacity, safety, and cost of lithium-ion batteries. Currently, the cathode materials used in the preparation of lithium-ion batteries are mainly prepared through solid-state sintering.

[0003] The production of lithium battery cathode materials mainly includes three stages: mixing and grinding, high-temperature sintering, and crushing and decomposition, with high-temperature sintering being the core of the entire process. Most existing sintering processes use roller kilns, where the mixed powder is fed into the roller kiln in batches using trolleys, saggers, or trays for heating and sintering. After reaching the specified time, the powder is removed for the next stage of cooling.

[0004] Currently, the existing technology for processing lithium battery cathode materials mainly uses roller kilns. Relevant literature is represented by Patent 1: Roller kiln for sintering cathode materials and multi-element cathode materials and their preparation method (Patent No.: CN113823764B), including Patent 2: A roller kiln for sintering lithium battery cathode materials (Patent No.: CN214406925U), Patent 3: A roller kiln for nickel-cobalt-manganese cathode materials (Patent No.: CN209326325U), and Patent 4: A roller kiln and its air inlet device (Patent No.: CN219934617U). All of these technologies use silicon carbide rods as the load-bearing and transmission components of the sagger. Figure 1 As shown.

[0005] The saggers, loaded with raw materials, are stacked in double layers on top of silicon carbide rods. Through the rotation of the silicon carbide rods, the saggers are transported from the kiln head to the kiln tail, sequentially passing through various process temperature zones to complete the calcination process. As a transmission component, the silicon carbide rods are limited by their mechanical properties at high temperatures and the structure supporting the saggers. Therefore, the silicon carbide rods cannot be made too thick or too long, restricting the width of the roller kiln and thus limiting the capacity of the kiln. Consequently, it is impossible to fill more saggers, thereby hindering increased output and reduced production costs. Currently, the largest lithium-ion battery cathode material production line in China uses a double-layer, six-row configuration, resulting in persistently high production costs.

[0006] Patent 5: A double-layer roller kiln for producing lithium-ion cathode materials and its production process (Patent No.: CN105783507A) proposes a double-layer roller kiln technology, such as... Figure 2As shown, it includes an upper kiln and a lower kiln, using double-layer silicon carbide rods. Each layer of silicon carbide rods is placed with saggers for firing. This improves the production efficiency of the roller kiln to some extent, but it does not fundamentally solve the problem of large-scale operation. In addition, there is a problem that the upper saggers may accidentally tip over and roll into the lower saggers during operation, causing product contamination. At the same time, the production efficiency and continuous stability of the kiln cannot be guaranteed. Utility Model Content

[0007] To address the problems of limited output and high production costs in existing lithium battery cathode material production or calcination equipment, this invention proposes a trolley-type calcining kiln system for large-scale production of lithium battery cathode materials. This system includes an internal kiln track within the kiln shell and an external kiln track outside the kiln shell. Multiple pushing devices enable the trolley to rotate cyclically along both tracks. The trolley completes the heating and calcination of the material as it passes the internal kiln track. After calcination and unloading, the trolley returns to the kiln head via the external kiln track. The trolley, after emptying back to the kiln head, is then reloaded and re-enters the internal kiln track for heating and calcination, thus repeating the cycle continuously. Based on this, this invention combines the trolley with the kiln shell, employing a cyclically rotating trolley-type conveying structure. This enables large-scale production of lithium battery cathode materials, reduces production costs, and solves the problems of low production efficiency and inconsistent production stability caused by the existing method of conveying materials from silicon carbide rods using loading saggers.

[0008] According to the embodiments of this utility model, a trolley-type calcining kiln system for large-scale production of lithium battery cathode materials is provided.

[0009] A large-scale trolley-type calcining kiln system for producing lithium-ion battery cathode materials includes a kiln shell, transport tracks, trolleys, silicon carbide heating rods, a first pushing device, a second pushing device, a third pushing device, and a fourth pushing device. The transport tracks include an inner kiln track and an outer kiln track. The inner kiln track is located inside the kiln shell and passes through both ends of the kiln shell. The outer kiln track is located outside the kiln shell. The trolley is positioned on the transport tracks and can move along them. The silicon carbide heating rods are located inside the kiln shell and above the trolleys. The first pushing device is located at the upstream end of the inner kiln track and propels the trolley along the inner kiln track. The second pushing device is located at the downstream end of the inner kiln track and propels the trolley from the inner kiln track to the outer kiln track. The third pushing device is located at the upstream end of the outer kiln track and propels the trolley along the outer kiln track. The fourth pushing device is located at the downstream end of the outer kiln track and propels the trolley from the outer kiln track to the inner kiln track. Air inlets and outlets are provided at the top of the kiln shell. It should be noted that both air intake and exhaust are achieved through this air inlet and outlet, but air intake or exhaust occurs separately at different stages of the process.

[0010] In this invention, the system further includes a loading container. The loading container is arranged on a trolley. Preferably, the system includes multiple trolleys. The multiple trolleys are arranged sequentially on a transport track. Each trolley is equipped with a loading container.

[0011] Preferably, each trolley is equipped with multiple loading containers. These containers are arranged side-by-side in the direction perpendicular to the trolley's travel. Preferably, in the vertical direction of the trolley, each row of containers is stacked in double layers.

[0012] In this invention, sand sealing structures are provided on both sides of the trolley. Each sand sealing structure includes a sand sealing blade and a sand sealing groove. One end of the sand sealing blade is fixed to the side wall of the trolley, the sand sealing groove is located on the kiln shell at the corresponding position, and the other end of the sand sealing blade extends into the sand sealing groove.

[0013] Preferably, water-sealing structures are also provided on both sides of the trolley. The water-sealing structure includes a water-sealing blade and a water-sealing groove. One end of the water-sealing blade is fixed to the side wall of the trolley, the water-sealing groove is set on the kiln shell at the corresponding position, and the other end of the water-sealing blade extends into the water-sealing groove.

[0014] In this invention, the system also includes a kiln head airtight replacement chamber located at the upstream end of the kiln shell and a kiln tail airtight replacement chamber located at the downstream end of the kiln shell.

[0015] In this invention, multiple trolleys arranged closely together on the kiln track along the trolley's running direction. Preferably, protrusions and grooves are provided on the front and rear sides of each trolley. The protrusions and grooves of each pair of adjacent trolleys cooperate to achieve a sealed connection between adjacent trolleys.

[0016] Preferably, a trolley seal release and top-opening device is also provided at the kiln tail position of the kiln shell. The trolley seal release and top-opening device has a conical structure and can be pneumatically or hydraulically driven. Its purpose is to separate two adjacent trolleys that are connected together through the movement of the conical top-opening device.

[0017] In this invention, multiple silicon carbide heating rods are installed inside the kiln shell. These silicon carbide heating rods are arranged along the direction of the trolley's movement.

[0018] In this invention, a refractory material layer is laid on the bottom of the trolley. Preferably, grooves are formed in the refractory material layer, and pre-embedded electric heating rods are arranged in the grooves.

[0019] Preferably, multiple pre-embedded heating rods are used. These multiple pre-embedded heating rods are arranged along the direction of the trolley's movement. Preferably, convection grooves are also formed within the refractory material layer.

[0020] In this invention, the system further includes a power receiving slider and a power supply rail disposed at the bottom of the trolley. The pre-embedded heating rod is powered by sliding along the power receiving slider and the power supply rail.

[0021] In this invention, the system further includes a loading device and a unloading device. The loading device is located on the side of the downstream end of the kiln external track. The unloading device is located on the side of the upstream end of the kiln external track.

[0022] In this invention, the kiln shell has a multi-layer structure, including a refractory layer, a heat insulation layer, and a heat preservation layer arranged sequentially from the inside out.

[0023] In this invention, the first and third pushing devices are both hydraulic push rods. The second and fourth pushing devices are both electric push rods.

[0024] To address the problems of limited output and high production costs in existing lithium-ion battery cathode material production or calcination equipment, this invention proposes a trolley-type calcining kiln system for large-scale production of lithium-ion battery cathode materials. This system includes an internal kiln track within the kiln shell and an external kiln track outside the kiln shell. Multiple pushing devices enable the trolley to rotate cyclically along both tracks. The trolley completes the heating and calcination of the material as it passes the internal kiln track. After calcination and unloading, the trolley returns to the kiln head via the external kiln track. The trolley, after returning empty, is reloaded and then re-enters the internal kiln track for heating and calcination, thus completing the cyclical movement. Based on this, this invention combines the trolley with the kiln shell, employing a planar, cyclically rotating trolley-type conveying structure. This enables large-scale production of lithium-ion battery cathode materials, reduces production costs, and effectively solves the problems of low production efficiency and inconsistent production stability caused by the existing method of conveying materials from silicon carbide rods using loading saggers.

[0025] In this invention, the large-scale trolley roasting kiln system for producing lithium battery cathode materials includes a kiln shell, transport tracks, a trolley, silicon carbide heating rods, a first pushing device, a second pushing device, a third pushing device, and a fourth pushing device. The transport tracks include an internal kiln track located inside the kiln shell and an external kiln track located outside the kiln shell. The trolley is positioned on the transport tracks and can move along them; that is, the trolley can move along both the internal and external kiln tracks. The silicon carbide heating rods, located inside the kiln shell and above the trolley, provide heat for the roasting of the material as the trolley moves along the internal kiln track. Simultaneously, an inlet / outlet is opened at the top of the kiln shell. Gas entering the kiln shell through these inlets is heated by the silicon carbide heating rods, and the kiln shell lining is also heated. The material inside the trolley is roasted through convection and radiation heat transfer. The first pushing device (e.g., a hydraulic pusher) is located at the upstream end of the kiln track (i.e., the kiln head position of the kiln shell) and is used to push the trolley along the kiln track, thus pushing the loaded trolley from the kiln head to the kiln tail. The second pushing device (e.g., an electric pusher, i.e., an electric pusher for trolley dispatch) is located at the downstream end of the kiln track (i.e., the kiln tail position of the kiln shell) and is used to push the trolley from the kiln track to the kiln external track, thus pushing the trolley located at the downstream end (i.e., the tail end) of the kiln track to the upstream end (i.e., the head end) of the kiln external track. The third pushing device (e.g., a hydraulic pusher) is located at the upstream end of the kiln external track and is used to push the trolley along the kiln external track, thus pushing the unloaded trolley from the head end to the tail end of the kiln external track. The fourth pushing device (e.g., an electric push rod, i.e., a loading electric push rod) is located at the downstream end of the kiln outer track. It is used to push the trolley from the outer track to the inner track, thus pushing the loaded trolley from the tail end of the outer track to the head end of the inner track, thereby realizing the trolley's cyclical use between the inner and outer tracks. This utility model combines the trolley with the kiln shell, proposing a trolley-type roasting kiln system. Based on the cyclical trolley-type conveying method adopted by this trolley-type roasting kiln, it is possible to achieve large-scale production of lithium battery cathode materials and reduce production costs, effectively solving the problems of existing lithium battery cathode material roasting kilns being unable to achieve large-scale production and having high production costs.

[0026] In this invention, a loading container (e.g., a loading sagger) is arranged on the trolley, which is used to hold the raw materials or materials to be heated and roasted. Since the main technical problem this invention aims to solve is to achieve large-scale production of lithium-ion battery cathode materials, multiple trolleys are arranged on a transport track, sequentially along the trolley's running direction, and each trolley is equipped with a loading container. To further improve production efficiency, multiple loading containers are arranged on each trolley, arranged side-by-side perpendicular to the trolley's running direction. Preferably, each row of loading containers is stacked in double layers. Side rails are provided on both sides of the trolley to prevent the loading containers from slipping or tipping over.

[0027] It should be noted that in this application, the direction of the trolley's movement is considered forward, and the "side rails on both sides of the trolley" here refers to the presence of side rails on both the left and right sides of the trolley. Unless otherwise specified in this application, "both sides of the trolley" refers to both the left and right sides.

[0028] In this invention, the kiln shell is a steel structure with refractory material inside, consisting of a refractory layer, a heat insulation layer, and a thermal insulation layer arranged sequentially from the inside out. The shape of the kiln shell is not limited; for example, it can be square or arc-shaped. Since the trolley is mounted on a transport track, and the kiln internal track within the transport track is located inside the kiln shell, to avoid affecting the normal movement of the trolley along the transport track inside the kiln shell, the kiln shell can be designed as follows: Figure 4 The hood structure shown has through holes at both ends along the axial direction. Since the kiln shell in this application is not a sealed structure, the sealing of the material during trolley operation needs to be considered. Therefore, this utility model adopts a dual sealing structure of sand seal and water seal to achieve a seal between the trolley and the kiln shell. Sand seal blades and water seal blades are respectively provided on both sides of the trolley, and corresponding sand seal grooves and water seal grooves are provided on the kiln shell. The high-temperature side of the sand seal blade is also provided with refractory castable, which is fixed by anchoring nails to prevent deformation and failure under high-temperature baking. The sand seal groove is filled with refractory sand, which, through sealing with the sand seal blade, isolates most of the high-temperature gas inside the kiln shell. The water seal groove is filled with liquid water, and the water seal blade is always inserted into the water during operation, ensuring a tight seal between the gas inside the kiln and the external gas. The kiln shell also has a kiln head airtight replacement chamber and a kiln tail airtight replacement chamber at the kiln head and kiln tail positions, respectively, which isolate the atmosphere inside and outside the kiln through air curtains, thereby ensuring the required process atmosphere inside the kiln. Furthermore, the operation of multiple trolleys along the kiln's internal track may lead to leakage of high-temperature gas within the kiln. Therefore, this invention arranges multiple trolleys closely together on the kiln's internal track. Specifically, this is achieved by setting bosses and grooves on the front and rear sides of each trolley, using the mating of male and female grooves between adjacent trolleys to achieve sealing between them. The bosses and grooves on the front and rear sides of the trolleys (the number of bosses and grooves can be multiple, for example, two bosses and two grooves on the front and rear sides of each trolley) are machined to ensure a good fit and coated with sealing grease. In the direction of trolley movement, the bosses and grooves of two adjacent trolleys cooperate with each other, further ensuring the seal between the trolleys under the thrust of the first pushing device. In addition to the sealing between the trolleys using the mating grooves, this invention includes a trolley seal release and opening device at the kiln tail position of the kiln shell. When a trolley reaches the kiln tail, this device opens the last trolley at the kiln tail, allowing it to smoothly enter the external track under the thrust of the second pushing device.

[0029] In this invention, a silicon carbide heating rod is installed in the upper part of the kiln shell, located above the material loading container on the trolley. Since the heat for heating and roasting the material inside the kiln shell mainly comes from the silicon carbide heating rod, multiple heating rods are used, arranged along the trolley's running direction. The specific heating power and density of the multiple silicon carbide heating rods are set according to the raw material roasting process temperature curve and automatically adjusted by a thyristor. The temperature regulation strategy is as follows: the control system compares the difference between the set target temperature and the actual detected temperature for each segment, and adjusts the heating power of the silicon carbide heating rod by controlling the conduction angle of the thyristor, thereby achieving temperature regulation and control. Specifically, when the actual temperature is lower than the target temperature, the system increases the conduction angle of the thyristor, increasing the heating power of the silicon carbide heating rod, causing the actual temperature to rise and approach the target temperature; conversely, when the actual temperature is higher than the target temperature, the system decreases the conduction angle of the thyristor, reducing the heating power of the silicon carbide heating rod, causing the actual temperature to fall and approach the target temperature.

[0030] The bottom of the trolley is lined with a refractory material layer to prevent high-temperature gases from baking the trolley body, thus allowing for a significant increase in trolley width, which is beneficial for enhancing the structural strength of the trolley and enabling its larger size. The refractory material layer at the bottom of the trolley has grooves, within which pre-embedded heating rods are arranged. Preferably, multiple pre-embedded heating rods are used, arranged along the trolley's running direction. Simultaneously, the bottom refractory material layer also has convection grooves, which help to increase the heating temperature of the bottom loading container and improve the product yield. The pre-embedded heating rods on the trolley are powered by a power supply slide rail and a power receiving slider. The power supply slide rail can be segmented, and the voltage and current of each segment can be adjusted independently to adapt to the temperature curve of the raw material roasting process. Generally, from the charging end to the discharging end, the kiln is divided into a first heating section, a first heat preservation section, a second heating section, a second heat preservation section, and a cooling section according to process requirements. The temperature of each section is set according to process requirements. The voltage and current of the pre-embedded electric heating rods in each section are automatically adjusted by the aforementioned silicon controlled rectifier temperature control system to ensure that the temperature of each section meets the process requirements.

[0031] The working principle of the large-scale trolley-type roasting kiln system for producing lithium battery cathode materials described in this utility model is as follows:

[0032] Multiple trolleys are connected end-to-end and arranged sequentially on a transport track via wheels. Raw material containers are arranged in two layers on the trolleys. Baffles are installed on both sides of the trolleys to prevent the containers from slipping or tipping over. Adjacent trolleys are equipped with a sealing structure with male and female grooves. Airtight replacement chambers are located at the kiln head and kiln tail, respectively. Air curtains isolate the atmosphere inside and outside the kiln, ensuring the required process atmosphere within the kiln. A first pushing device is installed at the kiln head to push the trolleys sequentially along the kiln track from the kiln head to the kiln tail.

[0033] During operation, the raw material loading containers on the trolleys are roasted inside the kiln shell and then pushed to the kiln tail by the first pushing device. The last trolley at the kiln tail, after being opened by the trolley seal release jack, is moved horizontally to the outside of the kiln by the second pushing device and enters the external track. The roasted raw material in the loading containers is unloaded by the unloading device, and the corresponding trolley is pushed to the kiln head by the third pushing device via the external track. After the raw material is loaded by the loading device, the trolley is pushed onto the kiln internal track at the kiln head by the fourth pushing device, and this cycle repeats continuously. The first pushing device reciprocates, pushing out one trolley from the kiln tail and loading one trolley from the kiln head each time. Multiple trolleys can also enter and exit simultaneously, enabling multiple trolleys to circulate between the internal and external tracks, thereby achieving large-scale production of lithium-ion battery cathode materials and reducing production costs.

[0034] In this application, "lithium battery cathode material" and "lithium battery cathode material" are expressions with the same meaning and can be used interchangeably.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. This utility model combines the trolley with the kiln shell and adopts a planar arrangement and cyclic rotation trolley-type conveying structure, thereby realizing the large-scale production of lithium battery cathode materials, reducing production costs, and effectively solving the problem of insufficient production efficiency and continuous stability caused by the existing method of conveying and transporting materials by placing the loading sagger on silicon carbide rods.

[0037] 2. This utility model adopts a dual sealing structure of sand seal and water seal to achieve the seal between the trolley and the kiln shell. At the same time, a kiln head airtight replacement chamber and a kiln tail airtight replacement chamber are respectively set at the kiln head and kiln tail. The atmosphere inside and outside the kiln is isolated by air curtain. Furthermore, a male and female groove structure is set on the front and rear sides of the trolley to achieve the seal between adjacent trolleys, thereby ensuring the tight isolation between the gas inside the kiln and the outside gas, ensuring the process atmosphere requirements inside the kiln, and improving production efficiency and product yield.

[0038] 3. This utility model places the material container on a trolley. The trolley body is insulated by a refractory material layer at the bottom, preventing it from contacting high-temperature gases. Therefore, the width of the trolley can be significantly increased, which is beneficial for the large-scale production of lithium battery cathode materials. At the same time, the pre-embedded heating rod at the bottom of the trolley can increase the temperature of the bottom material container, thereby improving the product yield. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a roller kiln for producing lithium battery cathode materials in the existing technology.

[0040] Figure 2A schematic diagram of a double-layer roller kiln used in the prior art for producing lithium battery cathode materials;

[0041] Figure 3 This is a plan view of a trolley-type calcining kiln system for large-scale production of lithium battery cathode materials according to this utility model.

[0042] Figure 4 for Figure 3 A schematic diagram of the cross-section at position AA;

[0043] Figure 5 for Figure 4 Cross-sectional diagram of the BB position;

[0044] Figure 6 for Figure 4 A cross-sectional view of the CC position;

[0045] Figure 7 This is a schematic diagram of the sealing structure between adjacent trolleys in this utility model.

[0046] Figure label:

[0047] 1: Kiln shell; 2: Transport track; 201: Inner kiln track; 202: Outer kiln track; 3: Trolley; 301: Boss; 302: Groove; 4: Silicon carbide heating rod; 501: First pushing device; 502: Second pushing device; 503: Third pushing device; 504: Fourth pushing device; 6: Air inlet / outlet; 7: Loading container; 801: Sand seal knife; 802: Sand seal groove; 901: Water seal knife; 902: Water seal groove; 10: Kiln head airtight replacement chamber; 11: Kiln tail airtight replacement chamber; 12: Trolley sealing release top opener; 13: Refractory material layer; 14: Embedded heating rod; 15: Convection groove; 16: Electric receiving slider; 17: Power supply slide rail; 18: Loading device; 19: Unloading device. Detailed Implementation

[0048] The technical solution of this utility model is illustrated below. The scope of protection of this utility model includes, but is not limited to, the following embodiments.

[0049] According to the embodiments of this utility model, a trolley-type calcining kiln system for large-scale production of lithium battery cathode materials is provided.

[0050] A large-scale trolley-type calcining kiln system for producing lithium-ion battery cathode materials includes a kiln shell 1, a transport track 2, a trolley 3, silicon carbide heating rods 4, a first pushing device 501, a second pushing device 502, a third pushing device 503, and a fourth pushing device 504. The transport track 2 includes an inner kiln track 201 and an outer kiln track 202. The inner kiln track 201 is located inside the kiln shell 1 and passes through both ends of the kiln shell 1. The outer kiln track 202 is located outside the kiln shell 1. The trolley 3 is positioned on the transport track 2 and can move along it. The silicon carbide heating rods 4 are located inside the kiln shell 1 and above the trolley 3. The first pushing device 501 is located at the upstream end of the inner kiln track 201 and is used to push the trolley 3 along the inner kiln track 201. The second pushing device 502 is located at the downstream end of the inner kiln track 201 and is used to push the trolley 3 from the inner kiln track 201 to the outer kiln track 202. The third pushing device 503 is located at the upstream end of the external kiln track 202 and is used to push the trolley 3 to move along the external kiln track 202. The fourth pushing device 504 is located at the downstream end of the external kiln track 202 and is used to push the trolley 3 from the external kiln track 202 to the internal kiln track 201. An air inlet / outlet 6 is provided on the top of the kiln shell 1.

[0051] In this invention, the system further includes a loading container 7. The loading container 7 is arranged on a trolley 3. Preferably, the system includes multiple trolleys 3. The multiple trolleys 3 are arranged sequentially on the transport track 2. Each trolley 3 is equipped with a loading container 7.

[0052] Preferably, each trolley 3 is equipped with multiple loading containers 7. The multiple loading containers 7 are arranged side by side in the direction perpendicular to the running direction of the trolley 3. Preferably, in the vertical direction of the trolley 3, each row of loading containers 7 is stacked in two layers.

[0053] In this invention, sand sealing structures are provided on both sides of the trolley 3. The sand sealing structure includes a sand sealing knife 801 and a sand sealing groove 802. One end of the sand sealing knife 801 is fixed to the side wall of the trolley 3, the sand sealing groove 802 is set on the kiln shell 1 at the corresponding position, and the other end of the sand sealing knife 801 extends into the sand sealing groove 802.

[0054] Preferably, water-sealing structures are also provided on both sides of the trolley 3. The water-sealing structure includes a water-sealing knife 901 and a water-sealing groove 902. One end of the water-sealing knife 901 is fixed to the side wall of the trolley 3, the water-sealing groove 902 is set on the kiln shell 1 at the corresponding position, and the other end of the water-sealing knife 901 extends into the water-sealing groove 902.

[0055] In this utility model, the system also includes a kiln head airtight replacement chamber 10 disposed at the upstream end of the kiln shell 1 and a kiln tail airtight replacement chamber 11 disposed at the downstream end of the kiln shell 1.

[0056] In this invention, multiple trolleys 3 arranged closely together on the kiln track 201 along the running direction of the trolley 3. Preferably, protrusions 301 and grooves 302 are provided on the front and rear sides of each trolley 3. The protrusions 301 and grooves 302 of each pair of adjacent trolleys 3 cooperate with each other to achieve a sealed connection between adjacent trolleys 3.

[0057] As a preferred option, a trolley seal release top opener 12 is also provided at the kiln tail position of the kiln shell 1.

[0058] In this invention, multiple silicon carbide heating rods 4 are provided inside the kiln shell 1. The multiple silicon carbide heating rods 4 are arranged along the running direction of the trolley 3.

[0059] In this invention, a refractory material layer 13 is laid at the bottom of the trolley 3. Preferably, grooves are formed in the refractory material layer 13, and pre-embedded electric heating rods 14 are arranged in the grooves.

[0060] Preferably, there are multiple pre-embedded heating rods 14. These multiple pre-embedded heating rods 14 are arranged along the running direction of the trolley 3. Preferably, convection grooves 15 are also formed within the refractory material layer 13.

[0061] In this invention, the system also includes a power receiving slider 16 and a power supply slide rail 17 disposed at the lower part of the trolley 3. The pre-embedded heating rod 14 is powered by sliding through the power receiving slider 16 and the power supply slide rail 17.

[0062] In this invention, the system further includes a loading device 18 and a unloading device 19. The loading device 18 is located on the side of the downstream end of the kiln external track 202. The unloading device 19 is located on the side of the upstream end of the kiln external track 202.

[0063] In this utility model, the kiln shell 1 has a multi-layer structure, including a refractory layer, a heat insulation layer, and a heat preservation layer arranged sequentially from the inside out.

[0064] In this invention, the first pushing device 501 and the third pushing device 503 are both hydraulic push rods. The second pushing device 502 and the fourth pushing device 504 are both electric push rods. Example 1

[0065] like Figure 3-4As shown, a large-scale trolley-type calcining kiln system for producing lithium-ion battery cathode materials is disclosed. The system includes a kiln shell 1, a transport track 2, a trolley 3, silicon carbide heating rods 4, a first pushing device 501, a second pushing device 502, a third pushing device 503, and a fourth pushing device 504. The transport track 2 includes an inner kiln track 201 and an outer kiln track 202. The inner kiln track 201 is located inside the kiln shell 1 and passes through both ends of the kiln shell 1. The outer kiln track 202 is located outside the kiln shell 1. The trolley 3 is positioned on the transport track 2 and can move along it. The silicon carbide heating rods 4 are located inside the kiln shell 1 and above the trolley 3. The first pushing device 501 is located at the upstream end of the inner kiln track 201 and is used to push the trolley 3 along the inner kiln track 201. The second pushing device 502 is located at the downstream end of the inner kiln track 201 and is used to push the trolley 3 from the inner kiln track 201 to the outer kiln track 202. The third pushing device 503 is located at the upstream end of the external kiln track 202 and is used to push the trolley 3 to move along the external kiln track 202. The fourth pushing device 504 is located at the downstream end of the external kiln track 202 and is used to push the trolley 3 from the external kiln track 202 to the internal kiln track 201. An air inlet / outlet 6 is provided on the top of the kiln shell 1.

[0066] The kiln shell 1 has a multi-layer structure, including a refractory layer, a heat insulation layer, and a thermal insulation layer arranged sequentially from the inside out. The first pushing device 501 and the third pushing device 503 are both hydraulic push rods. The second pushing device 502 is an electric push rod for vehicle dispatching, and the fourth pushing device 504 is an electric push rod for vehicle loading. Example 2

[0067] The system repeats Embodiment 1, except that it also includes a loading container 7, which is a loading sagger. The loading container 7 is arranged on the trolley 3. Example 3

[0068] The system repeats Embodiment 2, except that it includes multiple trolleys 3. These trolleys 3 are sequentially arranged on the transport track 2. Each trolley 3 is equipped with a loading container 7. Example 4

[0069] Example 3 is repeated, except that each trolley 3 is equipped with multiple loading containers 7. The multiple loading containers 7 are arranged side by side in the direction perpendicular to the running direction of the trolley 3. Example 5

[0070] Repeat Example 4, except that in the vertical direction of the trolley 3, each row of loading containers 7 is stacked in double layers. Example 6

[0071] Example 5 is repeated, except that sand sealing structures are provided on both sides of the trolley 3. The sand sealing structure includes a sand sealing knife 801 and a sand sealing groove 802. One end of the sand sealing knife 801 is fixed to the side wall of the trolley 3, the sand sealing groove 802 is set on the kiln shell 1 at the corresponding position, and the other end of the sand sealing knife 801 extends into the sand sealing groove 802. Example 7

[0072] The embodiment 6 is repeated, except that water-sealing structures are also provided on both sides of the trolley 3. The water-sealing structure includes a water-sealing knife 901 and a water-sealing groove 902. One end of the water-sealing knife 901 is fixed to the side wall of the trolley 3, the water-sealing groove 902 is set on the kiln shell 1 at the corresponding position, and the other end of the water-sealing knife 901 extends into the water-sealing groove 902. Example 8

[0073] The same as embodiment 7 is repeated, except that the system also includes a kiln head airtight replacement chamber 10 located at the upstream end of the kiln shell 1 and a kiln tail airtight replacement chamber 11 located at the downstream end of the kiln shell 1. Example 9

[0074] Repeat Example 8, except that multiple trolleys 3 arranged on the kiln track 201 are closely arranged together along the running direction of the trolley 3.

[0075] like Figure 7 As shown, protrusions 301 and grooves 302 are respectively provided on the front and rear sides of the trolley 3. The protrusions 301 and grooves 302 of each two adjacent trolleys 3 cooperate with each other to achieve a sealed connection between adjacent trolleys 3. Example 10

[0076] Repeat Example 9, except that a trolley seal release top opener 12 is also provided at the kiln tail position of the kiln shell 1. Example 11

[0077] Example 10 is repeated, except that multiple silicon carbide heating rods 4 are provided inside the kiln shell 1. The multiple silicon carbide heating rods 4 are arranged along the running direction of the trolley 3. Example 12

[0078] Repeat Example 11, except that the bottom of the trolley 3 is covered with a layer of refractory material 13. Example 13

[0079] like Figure 5-6 As shown, Example 12 is repeated, except that a groove is provided in the refractory material layer 13, and a pre-embedded electric heating rod 14 is arranged in the groove. Example 14

[0080] Example 13 is repeated, except that there are multiple pre-embedded heating rods 14. The multiple pre-embedded heating rods 14 are arranged along the running direction of the trolley 3. Example 15

[0081] The embodiment 14 is repeated, except that convection grooves 15 are also provided in the refractory material layer 13. Example 16

[0082] The system repeats Embodiment 15, except that it also includes a power receiving slider 16 and a power supply slide rail 17 disposed at the lower part of the trolley 3. The pre-embedded heating rod 14 is powered by sliding through the power receiving slider 16 and the power supply slide rail 17. Example 17

[0083] The system repeats Embodiment 16, except that it further includes a charging device 18 and a discharging device 19. The charging device 18 is located on the side of the downstream end of the kiln external track 202. The discharging device 19 is located on the side of the upstream end of the kiln external track 202.

[0084] In this embodiment, the working principle of the trolley roasting kiln system for large-scale production of lithium battery cathode materials is as follows:

[0085] After being roasted inside the kiln shell, the charging saggers loaded with raw materials on the trolleys are pushed to the kiln tail by hydraulic pushers. The last trolley at the kiln tail is pushed out of the kiln by an electric pusher after being opened by the trolley seal release mechanism, entering the external track. The roasted raw materials in the charging saggers are unloaded by the unloading device, and the corresponding trolleys are pushed to the kiln head by hydraulic pushers along the external track. After being loaded with raw materials by the charging device, the trolleys are pushed onto the kiln internal track at the kiln head by the loading electric pusher, and this cycle repeats continuously. The hydraulic pushers located at the upstream end of the kiln internal track reciprocate, pushing out one trolley from the kiln tail and loading one trolley from the kiln head each time. Multiple trolleys can also enter and exit simultaneously, enabling multiple trolleys to circulate between the kiln internal and external tracks, thereby achieving large-scale production of lithium-ion battery cathode materials and reducing production costs.

Claims

1. A large-scale production of lithium battery anode material trolley calcination kiln system, the system comprises a kiln shell (1), a transport track (2), a trolley (3), a silicon-carbon electric heating rod (4), a first pushing device (501), a second pushing device (502), a third pushing device (503), a fourth pushing device (504); the transport track (2) comprises a kiln track (201) and a kiln track (202); wherein, The kiln track (201) is arranged in the kiln shell (1) and passes through both ends of the kiln shell (1); the kiln track (202) is arranged outside the kiln shell (1); the trolley (3) is arranged on the transportation track (2) and can move along the transportation track (2); the silicon-carbon electric heating rod (4) is arranged in the kiln shell (1) and above the trolley (3); the first pushing device (501) is arranged at the upstream end of the kiln track (201) and used for pushing the trolley (3) to move along the kiln track (201); the second pushing device (502) is arranged at the downstream end of the kiln track (201) and used for pushing the trolley (3) to run from the kiln track (201) to the kiln track (202); the third pushing device (503) is arranged at the upstream end of the kiln track (202) and used for pushing the trolley (3) to move along the kiln track (202); the fourth pushing device (504) is arranged at the downstream end of the kiln track (202) and used for pushing the trolley (3) to run from the kiln track (202) to the kiln track (201); the kiln shell (1) is provided with an air inlet / outlet (6) at the top.

2. The system of claim 1, wherein: The system further comprises a loading container (7); the loading container (7) is arranged on the trolley (3).

3. The system of claim 2, wherein: The system comprises a plurality of trolleys (3); the plurality of trolleys (3) are arranged on the transportation track (2) in sequence; each trolley (3) is provided with a loading container (7).

4. The system of claim 3, wherein: A plurality of loading containers (7) are arranged on each trolley (3) respectively; the plurality of loading containers (7) are arranged side by side in the vertical direction of the trolley (3).

5. The system of claim 4, wherein: In the vertical direction of the trolley (3), each column of loading containers (7) is stacked as double layers.

6. The system of any one of claims 1-5, wherein: Sand sealing structures are arranged on both sides of the trolley (3) respectively; the sand sealing structure comprises a sand sealing cutter (801) and a sand sealing groove (802); one end of the sand sealing cutter (801) is fixed on the side wall of the trolley (3), the sand sealing groove (802) is arranged on the kiln shell (1) at the corresponding position, and the other end of the sand sealing cutter (801) extends into the sand sealing groove (802); or Water sealing structures are further arranged on both sides of the trolley (3) respectively; the water sealing structure comprises a water sealing cutter (901) and a water sealing groove (902); one end of the water sealing cutter (901) is fixed on the side wall of the trolley (3), the water sealing groove (902) is arranged on the kiln shell (1) at the corresponding position, and the other end of the water sealing cutter (901) extends into the water sealing groove (902).

7. The system of any one of claims 1-5, wherein: The system further comprises a kiln head airtight replacement chamber (10) arranged at the upstream end of the kiln shell (1) and a kiln tail airtight replacement chamber (11) arranged at the downstream end of the kiln shell (1).

8. The system of any one of claims 1-5, wherein: Along the running direction of the trolley (3), the plurality of trolleys (3) arranged on the kiln track (201) are arranged closely to each other.

9. The system of claim 8, wherein: A convex table (301) and a concave groove (302) are arranged on the front and back sides of the trolley (3) respectively; the convex table (301) and the concave groove (302) of every adjacent two trolleys (3) are matched with each other to realize the sealed connection between the adjacent trolleys (3).

10. The system of claim 9, wherein: The kiln tail position of the kiln shell (1) is further provided with a trolley sealing release top opener (12).

11. The system of any one of claims 1-5, wherein: A plurality of silicon-carbon electric heating rods (4) are arranged in the kiln shell (1); the plurality of silicon-carbon electric heating rods (4) are arranged along the running direction of the trolley (3).

12. The system of any one of claims 1-5, wherein: The trolley (3) is provided with a refractory layer (13) at the bottom.

13. The system of claim 12, wherein: A groove is formed in the refractory layer (13), and a pre-embedded electric heating rod (14) is arranged in the groove.

14. The system of claim 13, wherein: The number of the pre-embedded electric heating rods (14) is multiple; the multiple pre-embedded electric heating rods (14) are arranged along the running direction of the trolley (3).

15. The system of claim 14, wherein: A convection groove (15) is further formed in the refractory layer (13).

16. The system of any one of claims 13-15, wherein: The system further comprises a power receiving sliding block (16) and a power supply sliding rail (17) arranged at the lower part of the trolley (3); the pre-embedded electric heating rod (14) is powered by sliding through the power receiving sliding block (16) and the power supply sliding rail (17).

17. The system of any one of claims 1-5, 9-10, 13-15, wherein: The system further comprises a loading device (18) and an unloading device (19); wherein the loading device (18) is arranged at the side of the downstream end of the kiln external track (202); and the unloading device (19) is arranged at the side of the upstream end of the kiln external track (202).

18. The system of any one of claims 1-5, 9-10, 13-15, wherein: The kiln shell (1) is a multi-layer structure, comprising a refractory layer, a heat insulation layer and a heat preservation layer arranged from inside to outside; and / or The first pushing device (501) and the third pushing device (503) are both hydraulic push rods; and the second pushing device (502) and the fourth pushing device (504) are both electric push rods.

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