CN209783130U - Pole piece drying cabinet and pole piece drying equipment - Google Patents
Pole piece drying cabinet and pole piece drying equipment Download PDFInfo
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- CN209783130U CN209783130U CN201822244783.4U CN201822244783U CN209783130U CN 209783130 U CN209783130 U CN 209783130U CN 201822244783 U CN201822244783 U CN 201822244783U CN 209783130 U CN209783130 U CN 209783130U
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- piece drying
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- drying box
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Abstract
The utility model belongs to the technical field of the lithium cell manufacturing technique and specifically relates to indicate a pole piece drying cabinet, its chamber door including the uncovered box that is equipped with the inner chamber and being used for sealing the box, the box is equipped with and is used for the vacuum tube to inner chamber evacuation, and the box includes inner shell and shell, is equipped with the clearance between inner shell and the shell in order to form the heating chamber that is used for holding high temperature fluid, and the shell is equipped with and heats communicating input tube in chamber and output tube. The heating of the pole piece drying box is more uniform and stable, and the pole pieces are dried more thoroughly. The utility model also provides a pole piece drying equipment, including the base, the base is equipped with a plurality of above-mentioned pole piece drying cabinets, and the base is equipped with the evacuation mechanism that is linked together with the vacuum tube of every pole piece drying cabinet. Compared with a larger drying oven for drying the pole pieces, the pole pieces are placed in each pole piece drying oven in a certain number for drying, more pole pieces can be dried, the occupied area is small, the drying efficiency is higher, and the phenomenon that the pole pieces are not completely dried due to pole piece overstock is not easily caused during drying.
Description
Technical Field
the utility model belongs to the technical field of the lithium cell manufacturing technique and specifically relates to indicate a pole piece drying cabinet and pole piece drying equipment.
Background
A "lithium battery" is a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. Lithium metal batteries were first proposed and studied by Gilbert n.lewis in 1912. In the 70 s of the 20 th century, m.s.whitetingham proposed and began to study lithium ion batteries. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream nowadays.
At present, in the production and manufacturing process of lithium battery pole pieces, the drying of the lithium battery pole pieces generally adopts a wiping or baking method to remove the moisture on the surfaces of the lithium battery pole pieces; although the wiping method is simple and convenient, part of water is often remained on the surface of the lithium battery pole piece, which may cause the battery core to swell or deform; and to adopting the mode of toasting, the temperature that is heated of lithium-ion battery pole piece needs to reach 250 ℃, simultaneously because lithium-ion battery pole piece is more, can't guarantee to heat each naked position of pole piece when toasting, has the phenomenon of drying inhomogeneous, and drying efficiency is also lower, and the energy waste, and drying cost is great.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a pole piece drying cabinet, this device have thoroughly to the pole piece drying, characteristics that drying efficiency is high.
another object of the utility model is to provide a pole piece drying equipment, this device have to the pole piece dry even and high quality, drying rate is fast, the lower characteristics of energy saving cost
In order to achieve the above purpose, the utility model adopts the following technical scheme:
A pole piece drying box comprises a cover-free box body with an inner cavity and a box door for sealing the box body, wherein the box body is provided with a vacuum tube for vacuumizing the inner cavity; the box includes inner shell and shell, be equipped with the clearance between inner shell and the shell in order to form the heating chamber that is used for holding high temperature fluid, the shell is equipped with the communicating input tube in heating chamber and output tube, the input tube is used for heating the chamber with external high temperature fluid input, the output tube is used for discharging the fluid in the heating chamber.
furthermore, the inner shell is composed of a plurality of heat conducting plates, and the outer wall of the outer shell is provided with a heat insulating layer.
Furthermore, the uncovered end of box is equipped with the sealing washer, when the chamber door seals the box with the sealing washer butt cooperation.
Furthermore, a plurality of positioning columns are arranged at the uncovered end of the box body, and positioning holes matched with the positioning columns in an inserting mode are formed in the box door.
In order to realize another purpose, the utility model adopts the following technical scheme:
The utility model provides a pole piece drying equipment, its includes the base, the base is equipped with a plurality of foretell pole piece drying cabinets, the base is equipped with the evacuation mechanism that is linked together with the vacuum tube of every pole piece drying cabinet.
Further, the vacuumizing mechanism comprises a low vacuum pump, a low vacuum air storage tank communicated with the low vacuum pump, a high vacuum pump and a high vacuum air storage tank communicated with the high vacuum pump, the low vacuum tank is provided with a plurality of low pressure pipelines communicated with the vacuum pipe of each pole piece drying box, and the low pressure pipelines are provided with low vacuum valves; the high-vacuum tank is provided with a plurality of high-pressure pipelines communicated with the vacuum pipe of each pole piece drying box, and the high-pressure pipelines are provided with high-vacuum valves.
Furthermore, each vacuum tube of the pole piece drying box is also provided with a pressure relief tube, and the pressure relief tube is provided with a pressure relief valve.
Furthermore, a controller which is respectively and electrically connected with the low vacuum valve and the high vacuum valve of each pole piece drying box is also arranged on the base, each pole piece drying box is provided with a pressure sensor, and each pressure sensor is electrically connected with the controller;
the pressure sensor is used for detecting the pressure in the pole piece drying box, when the pressure of one pole piece drying box is greater than a first preset value, the pressure sensor in the pole piece drying box outputs a first signal, when the pressure of the pole piece drying box is smaller than the first preset value and larger than a second preset value, the pressure sensor outputs a second signal, and when the pressure of the pole piece drying box is smaller than the second preset value, the pressure sensor outputs a third signal;
The controller is used for controlling the opening and closing of the low vacuum valve and the high vacuum valve of each pole piece drying box, when the controller receives a first signal, the controller controls the high vacuum valve of the pole piece drying box to be closed and the low vacuum valve to be opened, when the controller receives a second signal, the controller controls the high vacuum valve of the pole piece drying box to be opened and the low vacuum valve to be closed, and when the controller receives a third signal, the controller controls the high vacuum valve of the pole piece drying box to be closed and the low vacuum valve to be closed.
further, the base is provided with a timer electrically connected with the controller, each pressure release valve of the pole piece drying box is electrically connected with the controller, a fourth signal is output when the timer reaches a third preset value, and the controller controls the high vacuum valves and the low vacuum valves of all the pole piece drying boxes to be closed and the pressure release valves of all the pole piece drying boxes to be opened.
The utility model has the advantages that:
The pole piece drying box is provided with an inner shell and an outer shell, a gap is formed between the inner shell and the outer shell to form a heating cavity used for containing high-temperature fluid, the outer shell is provided with an input pipe and an output pipe which are communicated with the heating cavity, the input pipe is used for inputting external high-temperature fluid into the heating cavity, the output pipe is used for discharging fluid in the heating cavity, the pole piece drying box is heated in a centralized manner, heating is more uniform, drying of pole pieces is facilitated, meanwhile, the pole piece drying box is vacuumized, and the pole pieces can be dried more thoroughly;
The pole piece drying equipment is provided with a plurality of pole piece drying boxes, and compared with a larger drying box for drying pole pieces, a certain number of pole pieces are placed in each pole piece drying box for drying, so that the equipment can dry more pole pieces under the condition of the same occupied space, the drying efficiency is higher, and the phenomenon of incomplete drying due to pole piece overstock is not easily caused during drying;
And thirdly, a controller which is electrically connected with the low vacuum valve and the high vacuum valve of each pole piece drying box respectively is also arranged on the base, each pole piece drying box is provided with a pressure sensor, each pressure sensor is electrically connected with the controller respectively, the pressure sensors are used for detecting the pressure in the pole piece drying boxes, the controllers are used for controlling the opening and closing of the low vacuum valve and the high vacuum valve of each pole piece drying box, the pole piece drying equipment is automatically controlled by the controllers, the control is simple, the automation level of the pole piece drying equipment is improved, the manual operation is reduced, and the production cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
fig. 1 is a schematic perspective view of the pole piece drying apparatus of the present invention;
FIG. 2 is a schematic view of the three-dimensional structure of the pole piece drying box of the present invention;
FIG. 3 is a schematic view of the explosion structure of the pole piece drying box of the present invention;
FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;
Fig. 5 is the electric connection relation schematic diagram between the pressure sensor, the timer, the low vacuum valve, the high vacuum valve, the pressure release valve and the controller of one of the pole piece drying boxes of the pole piece drying device of the utility model.
Description of reference numerals: 100. a base; 110. a mounting frame; 120. a universal wheel; 130. supporting legs; 200. a pole piece drying box; 210. a box body; 211. an inner shell; 212. a housing; 213. a positioning column; 214. a support bar; 215. a seal ring; 220. a box door; 221. positioning holes; 222. a roller; 230. a vacuum tube; 240. an input tube; 250. an output pipe; 300. a vacuum pumping mechanism; 310. a roughing pump; 320. a low vacuum gas storage tank; 330. a high vacuum pump; 340. a high vacuum gas storage tank; 350. a low pressure conduit; 360. a high pressure pipeline; 370. a low vacuum valve; 380. a high vacuum valve; 400. a pressure relief pipe; 410. a pressure relief valve; 510. a controller; 520. a pressure sensor; 530. a timer.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
as shown in fig. 1, the utility model provides a pair of pole piece drying equipment, it includes base 100, base 100 is equipped with a plurality of pole piece drying cabinets 200 and is used for carrying out the evacuation mechanism 300 of evacuation to pole piece drying cabinet 200, and pole piece drying cabinet 200 is including the uncovered box 210 that is equipped with the inner chamber (do not have the mark in the picture) and the chamber door 220 that is used for sealing box 210, and every pole piece drying cabinet 200 is equipped with the communicating vacuum tube 230 of inner chamber, and vacuum tube 230 is linked together with evacuation mechanism 300. During drying, the lithium battery pole piece is placed in the pole piece drying box 200, then the box door 220 is closed, the pole piece drying box 200 is vacuumized by the vacuumizing mechanism 300, the pole piece drying box 200 is heated so that the inner cavity reaches the designated temperature, and moisture on the pole piece in the inner cavity begins to evaporate and is gradually pumped away along with vacuumizing. The vacuum drying mode is adopted, the counter electrode plate is thoroughly dried, the drying quality is high, and the battery core of the lithium battery is not easy to expand or deform; meanwhile, compared with a larger drying oven for drying the pole pieces, the pole pieces are placed in a certain number in each pole piece drying oven 200 for drying, more pole pieces can be dried by the equipment under the condition that the occupied space is the same, the drying efficiency is higher, and the phenomenon that the drying is not complete due to pole piece overstock is not easily caused in the drying process.
As shown in fig. 1 and 2, the base 100 is provided with an installation frame 110 for fixing the plurality of pole piece drying boxes 200, and the plurality of pole piece drying boxes 200 are fixed on the installation frame 110 in a rectangular array, so that the space occupied by the plurality of pole piece drying boxes 200 can be saved. Can conveniently place lithium-ion battery pole pieces in pole piece drying cabinet 200, all pole piece drying cabinet 200's uncovered end all sets up towards the horizontal direction, and all pole piece drying cabinet 200's uncovered end orientation is the same. Vacuum tube 230 is located pole piece drying cabinet 200 and does not have the relative side of lid end, can reduce the clearance between the adjacent pole piece drying cabinet 200 like this, installs more pole piece drying cabinets 200 on mounting bracket 110, improves the rate of utilization of mounting bracket 110, and then improves pole piece drying efficiency.
Preferably, referring to fig. 3 and 4, the uncovered end of the box 210 is provided with a plurality of positioning pillars 213, and the box door 220 is provided with positioning holes 221 engaged with the positioning pillars 213. Specifically, two positioning columns 213 are disposed at the uncovered end of the box 210, the two positioning columns 213 are close to the upper side of the uncovered end of the box 210, the two positioning columns 213 are disposed obliquely upward, two positioning holes 221 are disposed on the door 220, when the two positioning holes 221 of the door 220 are inserted into the positioning columns 213, the door 220 can slide along the positioning columns 213 until abutting against the uncovered end of the box 210 under the action of its own gravity, and when the door 220 abuts against the uncovered end of the box 210, the door 220 can completely close the uncovered end of the box 210. In order to facilitate the sliding of the door 220, a roller 222 is rotatably disposed in the positioning hole 221 of the door 220, and the roller 222 can reduce the friction between the sidewall of the positioning hole 221 and the positioning post 213, thereby facilitating the sliding of the door 220.
Preferably, in order to improve the sealing performance between the door 220 and the box body 210, a sealing ring 215 is embedded in the uncovered end of the box body 210, the sealing ring 215 may be a rubber ring, the door 220 is in abutting fit with the sealing ring 215 when closing the box body 210, and the pole piece drying oven 200 is not prone to air leakage. After the door 220 slides along the positioning posts 213 and abuts against the uncovered end of the box 210, the vacuum pumping mechanism 300 starts to pump vacuum into the inner cavity, and the pressure in the inner cavity is lower than the external pressure, so that the door 220 can abut against the uncovered end of the box 210.
As shown in fig. 2 and 3, the box body 210 includes an inner shell 211 and an outer shell 212, a gap is formed between the inner shell 211 and the outer shell 212 to form a heating cavity (not shown) for containing high-temperature fluid, the outer shell 212 is provided with an input pipe 240 and an output pipe 250 which are communicated with the heating cavity, the input pipe 240 is used for inputting the external high-temperature fluid into the heating cavity, and the output pipe 250 is used for discharging the fluid in the heating cavity. Specifically, each pole piece drying box 200 is provided with two input pipes 240 and two output pipes 250, the two input pipes 240 and the two output pipes 250 are located on the side face of the pole piece drying box 200 opposite to the uncovered end, and the two input pipes 240 and the two output pipes 250 are located on the opposite corners of the side face respectively, so that high-temperature fluid can fully flow in the heating cavity, and the heating of the inner cavity is facilitated. The mold temperature controller is used for heating the pole piece drying box 200 by introducing heating oil into the heating cavity, the mold temperature controller can accurately control the oil temperature, the oil temperature adjusting range is large, and therefore the temperature of the pole piece drying box 200 can be controlled, and drying of pole pieces is facilitated.
preferably, the inner shell 211 is formed by a plurality of heat conducting plates (not labeled), and an aluminum alloy plate can be used, which has high heat conducting efficiency and is not easy to corrode. The outer wall of the outer shell 212 is provided with a thermal insulation layer (not labeled in the figure), and the thermal insulation layer can be made of composite magnesium aluminum silicate thermal insulation paint.
Preferably, in order to dry the pole piece more thoroughly, the downside shanghai of inner shell 211 inner wall is equipped with two bracing pieces 214, and bracing piece 214 can avoid the pole piece to place the inner chamber after with the downside butt of inner shell 211 together, be unfavorable for the drying.
as shown in fig. 1 and 2, the vacuum pumping mechanism 300 comprises a low vacuum pump 310, a low vacuum air storage tank 320 communicated with the low vacuum pump 310, a high vacuum pump 330 and a high vacuum air storage tank 340 communicated with the high vacuum pump 330, wherein the low vacuum tank is provided with a plurality of low pressure pipelines 350 communicated with the vacuum pipe 230 of each pole piece drying box 200, and the low pressure pipelines 350 are provided with low vacuum valves 370; the high vacuum air storage tank 340 is provided with a plurality of high pressure pipelines 360 communicated with the vacuum pipe 230 of each pole piece drying box 200, and the high pressure pipelines 360 are provided with high vacuum valves 380. During specific work, firstly, the low vacuum valve 370 is opened, the high vacuum valve 380 is closed, and the low vacuum pump 310 and the low vacuum air storage tank 320 work to vacuumize the pole piece drying box 200 to a first preset value; then, the low vacuum valve 370 is closed, the high vacuum valve 380 is opened, and the high vacuum pump 330 and the high vacuum storage tank 340 work to vacuumize the pole piece drying box 200 to a second preset value; and finally hot oil is introduced into the heating cavity to heat the pole piece drying box 200. The combination of the low vacuum pump 310 and the high vacuum pump 330 is adopted to vacuumize the inner cavity, so that the vacuum degree of the inner cavity can be improved, and the counter electrode plate is dried more thoroughly.
preferably, in order to facilitate pressure relief of pole piece drying box 200, vacuum pipe 230 of each pole piece drying box 200 is further provided with a pressure relief pipe 400, and pressure relief valve 410 is arranged on pressure relief pipe 400.
As shown in fig. 1, 2 and 5, the base 100 is further provided with a controller 510 electrically connected to the low vacuum valve 370 and the high vacuum valve 380 of each pole piece drying box 200, each pole piece drying box 200 is provided with a pressure sensor 520, and each pressure sensor 520 is electrically connected to the controller 510;
the pressure sensor 520 is used for detecting the pressure in the pole piece drying box 200, when the pressure of one pole piece drying box 200 is greater than a first preset value, the pressure sensor 520 in the pole piece drying box 200 outputs a first signal, when the pressure of the pole piece drying box 200 is smaller than the first preset value and larger than a second preset value, the pressure sensor 520 outputs a second signal, and when the pressure of the pole piece drying box 200 is smaller than the second preset value, the pressure sensor 520 outputs a third signal;
The controller 510 is used for controlling the opening and closing of the low vacuum valve 370 and the high vacuum valve 380 of each pole piece drying box 200, when the controller 510 receives a first signal, the controller 510 controls the high vacuum valve 380 of the pole piece drying box 200 to close and controls the low vacuum valve 370 to open, when the controller 510 receives a second signal, the controller 510 controls the high vacuum valve 380 of the pole piece drying box 200 to open and controls the low vacuum valve 370 to close, and when the controller 510 receives a third signal, the controller 510 controls the high vacuum valve 380 of the pole piece drying box 200 to close and controls the low vacuum valve 370 to close.
The base 100 is provided with a timer 530 electrically connected with the controller 510, the pressure relief valve 410 of each pole piece drying box 200 is electrically connected with the controller 510, when the timer 530 reaches a third preset value, a fourth signal is output, and the controller 510 controls the high vacuum valves 380 and the low vacuum valves 370 of all the pole piece drying boxes 200 to be closed and controls the pressure relief valves 410 of all the pole piece drying boxes 200 to be opened.
The pole piece drying equipment is automatically controlled by the controller 510, so that the automation level of the pole piece drying equipment is improved, manual operation is reduced, and the production cost is saved.
As shown in fig. 1, in order to facilitate moving the device, only a plurality of universal wheels 120 are disposed on the bottom surface of the base 100, and a plurality of supporting legs 130 are screwed to the base 100, so that when the device needs to be moved, the supporting legs 130 are rotated to separate the bottom ends of the supporting legs 130 from the ground, the universal wheels 120 abut against the ground, and when the device needs to be fixed, the supporting legs 130 are rotated in the reverse direction to abut against the ground, and the universal wheels 120 disengage from the ground.
The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.
Claims (9)
1. The utility model provides a pole piece drying cabinet which characterized in that: the vacuum box comprises a cover-free box body with an inner cavity and a box door for sealing the box body, wherein the box body is provided with a vacuum tube for vacuumizing the inner cavity; the box includes inner shell and shell, be equipped with the clearance between inner shell and the shell in order to form the heating chamber that is used for holding high temperature fluid, the shell is equipped with the communicating input tube in heating chamber and output tube, the input tube is used for heating the chamber with external high temperature fluid input, the output tube is used for discharging the fluid in the heating chamber.
2. The pole piece drying oven of claim 1, wherein: the inner shell is composed of a plurality of heat conducting plates, and the outer wall of the outer shell is provided with a heat insulating layer.
3. The pole piece drying oven of claim 1, wherein: and a sealing ring is arranged at the uncovered end of the box body, and the box door is matched with the sealing ring in an abutting mode when the box body is closed.
4. The pole piece drying oven of claim 1, wherein: the uncovered end of box is equipped with a plurality of reference columns, set up on the chamber door with reference column grafting complex locating hole.
5. the utility model provides a pole piece drying equipment, includes the base, its characterized in that: the base is provided with a plurality of pole piece drying boxes according to any one of claims 1 to 4, and the base is provided with a vacuum pumping mechanism communicated with the vacuum pipe of each pole piece drying box.
6. A pole piece drying apparatus as claimed in claim 5, wherein: the vacuum pumping mechanism comprises a low vacuum pump, a low vacuum gas storage tank communicated with the low vacuum pump, a high vacuum pump and a high vacuum gas storage tank communicated with the high vacuum pump, the low vacuum tank is provided with a plurality of low pressure pipelines communicated with the vacuum pipe of each pole piece drying box, and the low pressure pipelines are provided with low vacuum valves; the high-vacuum tank is provided with a plurality of high-pressure pipelines communicated with the vacuum pipe of each pole piece drying box, and the high-pressure pipelines are provided with high-vacuum valves.
7. the pole piece drying apparatus of claim 6, wherein: and each vacuum tube of the pole piece drying box is also provided with a pressure relief tube, and the pressure relief tube is provided with a pressure relief valve.
8. The pole piece drying apparatus of claim 7, wherein: the base is also provided with a controller which is respectively and electrically connected with the low vacuum valve and the high vacuum valve of each pole piece drying box, each pole piece drying box is provided with a pressure sensor, and each pressure sensor is electrically connected with the controller;
The pressure sensor is used for detecting the pressure in the pole piece drying box, when the pressure of one pole piece drying box is greater than a first preset value, the pressure sensor in the pole piece drying box outputs a first signal, when the pressure of the pole piece drying box is smaller than the first preset value and larger than a second preset value, the pressure sensor outputs a second signal, and when the pressure of the pole piece drying box is smaller than the second preset value, the pressure sensor outputs a third signal;
The controller is used for controlling the opening and closing of the low vacuum valve and the high vacuum valve of each pole piece drying box, when the controller receives a first signal, the controller controls the high vacuum valve of the pole piece drying box to be closed and the low vacuum valve to be opened, when the controller receives a second signal, the controller controls the high vacuum valve of the pole piece drying box to be opened and the low vacuum valve to be closed, and when the controller receives a third signal, the controller controls the high vacuum valve of the pole piece drying box to be closed and the low vacuum valve to be closed.
9. The pole piece drying apparatus of claim 8, wherein: the base is provided with a timer electrically connected with the controller, each pressure release valve of the pole piece drying box is electrically connected with the controller, a fourth signal is output when the timer reaches a third preset value, and the controller controls the high vacuum valves and the low vacuum valves of all the pole piece drying boxes to be closed and the pressure release valves of all the pole piece drying boxes to be opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822244783.4U CN209783130U (en) | 2018-12-27 | 2018-12-27 | Pole piece drying cabinet and pole piece drying equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822244783.4U CN209783130U (en) | 2018-12-27 | 2018-12-27 | Pole piece drying cabinet and pole piece drying equipment |
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| Publication Number | Publication Date |
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| CN209783130U true CN209783130U (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822244783.4U Active CN209783130U (en) | 2018-12-27 | 2018-12-27 | Pole piece drying cabinet and pole piece drying equipment |
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| CN (1) | CN209783130U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682174A (en) * | 2018-12-27 | 2019-04-26 | 东莞市超业精密设备有限公司 | A kind of pole piece drying box and pole piece drying equipment |
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2018
- 2018-12-27 CN CN201822244783.4U patent/CN209783130U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682174A (en) * | 2018-12-27 | 2019-04-26 | 东莞市超业精密设备有限公司 | A kind of pole piece drying box and pole piece drying equipment |
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