CN214406925U - Roller kiln for sintering lithium battery anode material - Google Patents
Roller kiln for sintering lithium battery anode material Download PDFInfo
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- CN214406925U CN214406925U CN202023151221.9U CN202023151221U CN214406925U CN 214406925 U CN214406925 U CN 214406925U CN 202023151221 U CN202023151221 U CN 202023151221U CN 214406925 U CN214406925 U CN 214406925U
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- thermocouple
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Abstract
The utility model provides a roller kiln of sintering lithium cell cathode material, including the kiln body (101), heating element (102), control by temperature change unit, casket-like bowl (103) and drive unit (104). Among the temperature control unit, the thermocouple wire enters the kiln body along with the transmission unit, can realize real-time dynamic detection actual sintering temperature, provides the basis for setting up the temperature system of adjusting roller kilns, reduces actual sintering temperature difference to improve the homogeneity of material performance.
Description
Technical Field
The utility model belongs to the technical field of sintering equipment, concretely relates to roller kilns of positive electrode material of sintering lithium cell.
Background
At present, in the production process of the electrode material of the lithium ion battery, sintering equipment such as a roller kiln, a pushed slab kiln or a rotary kiln is mainly adopted in the sintering process. The roller kiln is suitable for sintering electrode materials of lithium batteries of different types due to high capacity and stable and reliable operation, and is widely adopted by domestic and foreign users.
Roller kilns, also known as roller hearth kilns, are continuously fired kilns, tunnel kilns which use rotating rollers as blank carriers, saggars filled with electrode materials are placed on a plurality of horizontal high-temperature-resistant rollers with close intervals, the saggars are conveyed to the kiln tail from the kiln head by the rotation of the rollers, the roller kilns are generally small in section, uniform in temperature, suitable for rapid firing and quite wide in application at present.
However, the lithium cobaltate, lithium manganate, ternary material and other positive electrode materials in the lithium battery positive electrode material are usually roller kilns in an air atmosphere, mainly non-sealed kilns, heating points and temperature measuring points are located at different positions in the kiln, and have a certain distance in space with saggars at different positions. The performance of the electrode material is greatly influenced, so that the performance of the sintered electrode material is not uniform, and the uniformity and stability of the charge and discharge performance of the lithium battery are influenced.
In addition, in order to improve the productivity and reduce the energy consumption, a multilayer sagger stacking arrangement is adopted, but the design mode can cause the temperature of the upper layer and the lower layer of the material in the sintering process to be inconsistent with the atmosphere, so that the performances of the obtained cathode material are necessarily greatly different. The traditional sintering equipment adopts a mode that the temperatures of an upper heating device and a lower heating device are consistent to set, so that the actual temperatures of sagger materials at different positions are obviously different, and the crystal structure and the performance of the sintered material are greatly different.
Therefore, in the practical production of the lithium battery anode material, the problem that the performance of the anode material is not uniform due to large sintering temperature difference in the roller kiln in the air atmosphere at present is urgently needed to be solved.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the inventor of the invention carries out intensive research, improves the distributability of temperature and atmosphere by designing a sagger structure, increases a side heating point, realizes multi-point real-time monitoring of the sintering temperature at the sagger under the condition of not changing the structure of the roller kiln body, sets a temperature detection point according to the requirement, and monitors and controls the sintering temperature in the roller kiln in real time by using a temperature monitoring system.
An object of the utility model is to provide a sintering lithium cell cathode material's roller kilns, roller kilns includes the kiln body, heating unit, temperature control unit, casket-like bowl and drive unit.
The temperature control unit comprises a control component and a monitoring component. The control assembly is respectively connected with the monitoring assembly and the heating unit.
The monitoring assembly adopts a thermocouple to measure temperature. The thermocouple is used for fixed position detection and/or dynamic position detection, and preferably, the temperature is monitored by combining the fixed position detection and the dynamic position detection.
The thermocouple for dynamic position detection adopts a thermocouple wire, the thermocouple wire comprises a wire body part and a detection head, the length of the thermocouple wire is longer than that of the kiln body, the detection head of the thermocouple is placed in a sagger, and the thermocouple wire enters the kiln body along with a transmission unit.
The filament body part of the thermocouple wire is placed in a high-temperature resistant protective sleeve. And arranging a plurality of sections of high-temperature-resistant protective sleeves which are sleeved outside the thermocouple wire body part.
The single thermocouple wire is sleeved with a separation sleeve, a plurality of thermocouple wires sleeved with the separation sleeve form a thermocouple bundle, and a high-temperature-resistant protective sleeve is sleeved outside the thermocouple bundle. And arranging a plurality of thermocouple bundles according to requirements. The separation sleeve is arranged in a subsection mode.
The sagger is preferably a square-shaped pot. When the electrode material sintering device is used, an electrode material to be sintered is placed inside the electrode material sintering device, placed on the transmission unit and enters the roller kiln to be sintered.
The utility model discloses in, set up the recess in the upper end of sagger lateral wall, perhaps set up the hole on sagger lateral wall first one.
The sagger is provided with the grooves or the holes at least at two opposite side walls, or the grooves or the holes are arranged at the side walls at four sides. The grooves or holes are symmetrically arranged on two opposite side walls of the sagger, and the symmetry planes of the two side walls are used as symmetry planes.
The utility model provides a roller kilns of positive electrode material of sintering lithium cell has following beneficial effect:
(1) the utility model discloses a fixed position and dynamic position utilize the dynamic position detection of sagger department to temperature real-time supervision, and the adjustment temperature sets up, reduces actual sintering temperature difference to improve homogeneity and stability of material performance.
(2) By designing the dynamic position detection thermocouple to be matched with the saggar for use, the actual sintering temperature of the electrode material is monitored in real time in the saggar, and a basis is provided for reducing the temperature difference and unifying the sintering conditions.
(3) Through the design of the sagger structure, the blocking of the side wall of the sagger in space is reduced, the atmosphere in the kiln can reach electrode materials in the sagger more, the distributability of the temperature and the atmosphere is improved, meanwhile, the side heating points are increased, the mode of arranging thermocouples is adopted, the sintering temperature at the sagger is monitored in real time at multiple points under the condition that the structure of the kiln body of the roller kiln is not changed, and the atmosphere and the temperature tend to be distributed uniformly.
Drawings
Fig. 1 shows a schematic diagram of a roller kiln for sintering a lithium battery cathode material according to the present invention;
FIG. 2 is a schematic diagram illustrating a thermocouple wire for dynamic position sensing according to the present invention;
FIG. 3 is a schematic view of a container of the present invention;
fig. 4 shows a schematic structural diagram of a container of the present invention.
The reference numbers illustrate:
101-a kiln body;
102-a heating unit;
103-sagger;
104-a transmission unit;
201-a control component;
202-a filament portion;
203-detection head.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, and the features and advantages of the present invention will become more apparent and clear with the description.
The utility model provides a roller kilns of sintering lithium cell cathode material, roller kilns includes the kiln body 101, heating element 102, temperature control unit, saggar 103 and drive unit 104, as shown in fig. 1.
The kiln body 101 comprises a kiln wall, a kiln top and a kiln bottom, and an internal kiln path is defined by the kiln wall, the kiln top and the kiln bottom, so that the kiln body 101 is formed.
The heating unit 102 adopts one or two of open flame heating, flame-proof heating or electric heating, preferably adopts flame-proof heating and/or electric heating.
When the heating unit 102 is heated by open flame, a burner is provided in the kiln body 101.
When the heating unit 102 adopts a flame-proof heating mode, the kiln body 101 further comprises a flame-proof channel.
When the heating unit 102 is electrically heated, an electric heating element, such as a silicon carbide rod, is arranged in the kiln body 101.
The utility model discloses in, inside the kiln body 101, when setting up the heating source in top and below, still set up the heating source of side, make the heating source distribute in each position of the kiln body, but improve the distributability of temperature reduces the time that reaches the stable temperature environment.
The temperature control unit includes a control component 201 and a monitoring component. The control component 201 is respectively connected with the monitoring component and the heating unit 102, the monitoring component transmits the detected temperature to the control component 201, and the control component 201 adjusts the set temperature of the heating unit 102 according to preset conditions. Preferably, the control component 201 is a program control, such as a PLC control.
The utility model discloses in, set up multistage programming rate, heat time isoparametric formation temperature curve through control assembly 201. If the difference between the set temperature and the actually detected temperature is more than or equal to 100 ℃, adopting a first-level heating rate; when the difference value between the set temperature and the actually detected temperature is less than 100 ℃ and more than or equal to 20 ℃, adopting a secondary heating rate; and when the difference value between the set temperature and the actually detected temperature is less than 10 ℃, adopting a three-level heating rate, wherein the first-level heating rate, the second-level heating rate and the third-level heating rate are sequentially reduced.
The thermocouples are fixed position sensing and/or dynamic position sensing.
The monitoring assembly adopts a thermocouple for temperature measurement, and comprises a fixed-position thermocouple, so that fixed-position monitoring is realized. The fixed position detection is to arrange a thermocouple at a fixed position of the kiln body 101 and detect the temperature change condition of the position in real time.
The monitoring assembly further comprises a dynamic position thermocouple wire, and dynamic position monitoring is achieved. The dynamic position detection is that the thermocouple wires are driven along with the sagger 103, and the temperature of the position of the sagger 103 is detected in real time. Preferably, the utility model discloses a fixed position detects the mode that combines with dynamic position detection and monitors the temperature, and then can in time detect the change of temperature, according to demand adjustment temperature control.
Lithium cobaltate, lithium manganate, ternary materials and other positive electrode materials in the lithium battery positive electrode material are generally required to be sintered in an air atmosphere, so a track is required to be a non-sealed kiln, and a heating point, a temperature measuring point and an electrode material are spaced at a certain distance. The performance of the sintered electrode material is not uniform to a large extent, so that the uniformity and the stability of the charging and discharging performance of the lithium battery are influenced.
Adopt the utility model provides a temperature control unit can real-time detection saggar 103 inner electrode material's sintering temperature to take in time to adjust the control by temperature change. In addition, when a roller kiln temperature system for adjusting specific materials is set, the fixed position temperature can be monitored by combining fixed position detection and dynamic position detection, the overall temperature distribution condition of the roller kiln can be known, and the difference between the actual sintering temperature in the sagger 103 and the set temperature at the position can be monitored by utilizing dynamic position detection, so that the heating unit 102 at the specific position can be adjusted, the sintering temperature of the electrode material can be better controlled, the consistency of the sintering conditions can be realized, and the uniformity and the stability of the performance of the lithium battery anode material can be controlled.
In addition, the thermocouple for dynamic position detection can be arranged or additionally arranged without changing the structure of the kiln body 101, and can be flexibly arranged in different saggars 103 according to requirements, so that the use is convenient and flexible. After the temperature of the kiln body 101 is stable, a thermocouple for dynamic position detection can not be placed.
The thermocouple for dynamic position detection adopts thermocouple wires, such as rhodium-iridium alloy thermocouple wires. The thermocouple wire includes a wire portion 202 and a detection head 203, as shown in fig. 2, the length of the thermocouple wire is longer than the length of the kiln body 101, the detection head 203 of the thermocouple is placed in the sagger 103, and the thermocouple wire enters the kiln body 101 along with the transmission unit 104.
The thermocouple wires are placed in the sagger 103, preferably with the wire portion 202 of the thermocouple wires placed in a high temperature resistant protective sheath. A plurality of sections of high-temperature-resistant protective sleeves are arranged and sleeved outside the thermocouple wire body part 202, so that the thermocouple wires are protected in the sagger 103 conveying process.
Preferably, a plurality of thermocouple wires are placed in the high-temperature resistant protective sleeve, and the detection heads 203 of the thermocouple wires are respectively positioned in different saggars 103. The single thermocouple wires are sleeved with the separation sleeves so as to ensure that the thermocouple wires are not in contact with each other. Namely, a single thermocouple wire is sleeved with a separation sleeve, a plurality of thermocouple wires sleeved with the separation sleeve form a thermocouple bundle, and a high-temperature-resistant protective sleeve is sleeved outside the thermocouple bundle. And arranging a plurality of thermocouple bundles according to requirements. The separation sleeve is arranged in a subsection mode.
The high-temperature-resistant protective sleeve and the separation sleeve are both annular cylinders and are made of high-temperature-resistant materials, such as corundum. The outer diameter of the separating sleeve is smaller than the inner diameter of the high-temperature-resistant protective sleeve, and the length of the single-section separating sleeve is longer than that of the single-section high-temperature-resistant protective sleeve.
The sagger 103 is preferably a square-shaped pot. When in use, the electrode material is placed inside, placed on the transmission unit 104 and enters the roller kiln for sintering.
The utility model discloses in, set up the recess in the upper end of sagger 103 lateral wall, the recess is square, semi-circular or U-shaped, perhaps sets up the hole on sagger 103 lateral wall first half, the hole is irregular hole, quad slit, round hole, oval hole or U-shaped hole. The sagger 103 is provided with the grooves or holes at least at two opposite side walls, or the grooves or holes are arranged at four side walls. The grooves or holes are symmetrically arranged on two opposite side walls of the sagger 103, taking the symmetry plane of the two side walls as the symmetry plane, as shown in fig. 3 and 4.
Preferably, the inner smallest dimension of the recess or hole is larger than the outer diameter of the high temperature resistant protective sheath. The high-temperature resistant protective sleeve is arranged in the groove or the hole.
On the one hand, set up on the sagger 103 lateral wall recess or hole place the thermocouple wire that has high temperature resistant protective sheath, make the thermocouple wire can not take place to shift at sagger 103 transmission in-process, influence the settlement of detection position, protection thermocouple wire does not receive to drag and damage.
On the other hand, in the current actual production, in order to improve the productivity and reduce the energy consumption, the multilayer saggars 103 are arranged in an overlapping mode, but the design mode can cause the temperature of the upper layer and the lower layer of the material in the sintering process to be inconsistent with the atmosphere, so that the performance of the obtained cathode material has great difference. The grooves or holes arranged on the saggar 103 can improve the temperature distributability, enhance the flow of internal air flow and facilitate the uniform distribution of a temperature field and atmosphere.
The utility model discloses in, for the homogeneity of further improvement lower floor temperature and atmosphere, sagger 103 is less than along the ascending width in vertical drive side along the ascending width in transmission side, preferably, sagger 103 is for following the 1/2 of the ascending width in vertical drive side along the ascending width in transmission side, and the clearance between sagger 103 like this increases, is favorable to the evenly distributed of atmosphere and temperature, and the thermocouple wire of the heating source cooperation fixed position detection and the dynamic position detection of the kiln body 101 side is favorable to adjusting the temperature of different positions simultaneously.
The transmission unit 104 comprises a roller way and a power device, a plurality of rollers are arranged along the transmission direction, the side surfaces of the rollers are adjacent, and two ends of each roller are arranged in a transmission track to form the roller way. Wherein, the end of the roller rod arranged on the track connected with the power device is a power end, and the other end is a driven end. Under the drive of the power device, the plurality of roller rods rotate simultaneously, and the sagger 103 arranged on the roller way is driven to rotate towards the roller rods.
The utility model discloses in the roller kilns that provide adopt multiple spot monitoring sintering temperature, realize the regulation and control of temperature, utilize fixed position and dynamic position to detect, be favorable to reducing the difference of actual sintering temperature and settlement temperature, do benefit to equipment regulation and control, convenient nimble, simultaneously, design adjustment saggar 103 and roller bed structure make the internal atmosphere of kiln and temperature field more uniform, make the industrial production go on smoothly.
The invention has been described in detail with reference to specific embodiments and/or illustrative examples and the accompanying drawings, which, however, should not be construed as limiting the invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and embodiments thereof without departing from the spirit and scope of the present invention, and all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.
Claims (10)
1. A roller kiln for sintering lithium battery anode materials is characterized by comprising a kiln body (101), a heating unit (102), a temperature control unit, a sagger (103) and a transmission unit (104),
the temperature control unit comprises a control component (201) and a monitoring component, the monitoring component measures temperature by using a thermocouple and comprises a fixed-position thermocouple,
the monitoring assembly further comprises a dynamic position thermocouple wire, the thermocouple wire comprises a wire body part (202) and a detection head (203), the length of the thermocouple wire is longer than that of the kiln body (101), the detection head (203) of the thermocouple wire is placed in the sagger (103), and the thermocouple wire enters the kiln body (101) along with the transmission unit (104).
2. Roller kiln according to claim 1, characterized in that a groove is provided at the upper end of the sagger (103) side wall or a hole is provided on the upper half of the sagger (103) side wall, the thermocouple wire is placed on the sagger (103).
3. Roller kiln according to claim 1, characterized in that the heating unit (102) employs one or a combination of two of open flame heating, muffle heating or electric heating.
4. Roller kiln according to claim 1, characterized in that said control assembly (201) is connected to a monitoring assembly and to a heating unit (102), respectively.
5. The roller kiln according to claim 1, characterized in that the filament part (202) of the thermocouple wires is placed in a high temperature resistant protective sheath, several sections of high temperature resistant protective sheaths are provided, which are sleeved outside the filament part (202) of the thermocouple wires,
the single thermocouple wire is sleeved with a separation sleeve, a plurality of thermocouple wires sleeved with the separation sleeve form a thermocouple bundle, a high-temperature-resistant protective sleeve is sleeved outside the thermocouple bundle, and the separation sleeve is arranged in a segmented mode.
6. The roller kiln according to claim 5, characterized in that the refractory protective sheath and the spacer sleeve are both annular cylinders, the outer diameter of the spacer sleeve is smaller than the inner diameter of the refractory protective sheath, and the length of the single-stage spacer sleeve is longer than that of the single-stage refractory protective sheath.
7. Roller kiln according to claim 1, characterized in that a groove is provided at the upper end of the side wall of the sagger (103), said groove being square, semicircular or U-shaped, or a hole is provided at the upper half of the side wall of the sagger (103), said hole being an irregular hole, a square hole, a round hole, an elliptical hole or a U-shaped hole,
the grooves or holes are symmetrically arranged on two opposite side walls of the sagger (103), and the symmetry planes of the two side walls are used as symmetry planes.
8. Roller kiln according to claim 7, characterized in that on the side wall of the sagger (103) there are provided said grooves or holes, where thermocouple wires with a high temperature resistant protective sheath are placed.
9. Roller kiln according to claim 1, characterized in that the sagger (103) has a width in the direction of transmission smaller than the width in the direction of vertical transmission.
10. Roller kiln according to claim 1, characterized in that the transmission unit (104) comprises a roller table and a power device, a plurality of rollers are arranged along the transmission direction, the rollers are adjacent to each other laterally, and the two ends of the rollers are arranged in the transmission track to form the roller table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023151221.9U CN214406925U (en) | 2020-12-23 | 2020-12-23 | Roller kiln for sintering lithium battery anode material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023151221.9U CN214406925U (en) | 2020-12-23 | 2020-12-23 | Roller kiln for sintering lithium battery anode material |
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| Publication Number | Publication Date |
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| CN214406925U true CN214406925U (en) | 2021-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023151221.9U Active CN214406925U (en) | 2020-12-23 | 2020-12-23 | Roller kiln for sintering lithium battery anode material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659360A (en) * | 2022-02-22 | 2022-06-24 | 广东邦普循环科技有限公司 | Sintering system for improving temperature uniformity |
-
2020
- 2020-12-23 CN CN202023151221.9U patent/CN214406925U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659360A (en) * | 2022-02-22 | 2022-06-24 | 广东邦普循环科技有限公司 | Sintering system for improving temperature uniformity |
| CN114659360B (en) * | 2022-02-22 | 2024-03-12 | 广东邦普循环科技有限公司 | Sintering system with improved temperature uniformity |
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