CN215529362U - Pole piece heating mechanism and pole piece rolling device - Google Patents
Pole piece heating mechanism and pole piece rolling device Download PDFInfo
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- CN215529362U CN215529362U CN202121148256.9U CN202121148256U CN215529362U CN 215529362 U CN215529362 U CN 215529362U CN 202121148256 U CN202121148256 U CN 202121148256U CN 215529362 U CN215529362 U CN 215529362U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 94
- 230000007246 mechanism Effects 0.000 title claims abstract description 65
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000012545 processing Methods 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 238000005056 compaction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 239000011149 active material Substances 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000010924 continuous production Methods 0.000 description 1
- 208000012839 conversion disease Diseases 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to the technical field of lithium battery processing, and discloses a pole piece heating mechanism and a pole piece rolling device, wherein the pole piece heating mechanism comprises: the microwave generating device comprises two microwave generating devices which form a microwave generating group, wherein the two microwave generating devices in the same microwave generating group are oppositely arranged on two sides of the pole piece, and the output end of each microwave generating device faces to the pole lug of the pole piece and is used for heating the pole lug and the joint part of the pole lug and the main body of the pole piece; and the output end of the driving device is connected to the microwave generating device, and the driving device is used for driving the microwave generating device to move along the width direction of the pole piece. Through the structure, the temperature of the pole piece heating mechanism is fast, and the heating temperature is easy to control.
Description
Technical Field
The utility model relates to the technical field of lithium battery processing, in particular to a pole piece heating mechanism and a pole piece rolling device.
Background
The general technology of lithium ion battery is to make active material, conductive agent, binder and solvent into slurry, to coat a layer of slurry with certain thickness on the current collector (usually copper foil or aluminum foil) by coating equipment, to dry and then to coat the reverse side. The electrode coated on both sides is generally rolled once to twice to control the porosity and density of the electrode, then the electrode is cut and wound into a cell, finally the cell is combined into a battery, and the battery can be a lithium ion battery for commercial use through liquid injection and formation. Research shows that besides the inherent properties of the electrode active material of the lithium ion battery, the microstructure of the electrode has important influence on the energy density and the electrochemical performance of the battery. In the uncrushed electrode, only 50% of the space is occupied by the active material, and the increase of the compacted density can effectively increase the volume energy density and the weight energy density of the electrode, but the volume energy density and the weight energy density of the electrode can also be influenced, and the electrode structure, such as porosity, specific surface area, pore size distribution, tortuosity and the like, can also be influenced, and the distribution of a binder and a conductive agent in the electrode can also be influenced, so that the electrochemical performance of the lithium ion battery can be obviously influenced. The increase of the compaction density can ensure that the discharge specific capacity of the material is higher, the rate capability is better, the capacity retention rate is higher, and the discharge voltage of the lithium ion battery can also be improved. The problem of low specific discharge capacity can be brought by low compaction density, which is mainly that high porosity causes part of particles to form an insulation state and cannot participate in charge and discharge, and the electrode with high compaction density has higher fracture strength and can avoid the electrode particles from falling off in the circulation process to form insulation state particles. The high compaction density can obviously make the pore diameter and pore distribution of the electrode more uniform, the conductive agent and the binder are more uniformly distributed, the contact resistance and the charge exchange impedance of the electrode are reduced, the active area capable of participating in the reaction is increased, and the electrochemical performance of the material is obviously improved.
However, after the pole piece is compacted to be too high in density, the situation of belt breakage is easy to occur, so that the qualification rate of the pole piece is low. At present, in order to improve the yield of tableting, a method of heating an electrode sheet and then rolling the electrode sheet is generally adopted. Conventional heating methods, such as steam heating, electric heating, infrared heating, and the like, require a certain temperature and a certain time to elapse, and when a fault occurs or heating is stopped, the temperature decreases and a longer time elapses. Moreover, these conventional industrial heating devices generally have a large volume, occupy a large amount of space, have a high ambient temperature, and are poor in working conditions and high in labor intensity of operators.
SUMMERY OF THE UTILITY MODEL
One object of the present invention is to provide a pole piece heating mechanism, which not only has fast temperature rise, but also has easy temperature control,
in order to achieve the purpose, the utility model adopts the following technical scheme:
a pole piece heating mechanism for heating a pole piece, comprising: the microwave generating device comprises a pole piece, at least two microwave generating devices, a power supply and a control circuit, wherein each two microwave generating devices form a microwave generating group, two microwave generating devices in the same microwave generating group are oppositely arranged on two sides of the pole piece, and the output end of each microwave generating device faces to the pole lug of the pole piece and is used for heating the pole lug and the joint part of the pole lug and the main body of the pole piece; and the output end of the driving device is connected to the microwave generating device, and the driving device is used for driving the microwave generating device to move along the width direction of the pole piece.
As a preferred scheme of the pole piece heating mechanism, the microwave generating groups are provided with two groups, and the two groups of microwave generating groups are respectively arranged at two ends of the pole piece in the width direction.
As a preferred scheme of the pole piece heating mechanism, the preferred scheme of the pole piece heating mechanism further comprises a position sensor, wherein the position sensor is connected with the driving device and is used for measuring the position of the pole lug and transmitting the position information of the pole lug to the driving device.
As a preferable scheme of the pole piece heating mechanism, the position sensor is a grating sensor.
As a preferred scheme of the pole piece heating mechanism, the output end of the driving device is connected with the two microwave generating devices in the same microwave generating group, so as to drive the two microwave generating devices in the same microwave generating group to move synchronously.
As a preferred scheme of the pole piece heating mechanism, the preferred scheme of the pole piece heating mechanism further comprises a temperature measuring instrument, and the temperature measuring instrument is used for measuring the temperature of the surface of the pole piece.
As a preferred scheme of the pole piece heating mechanism, the distance between the output end of the microwave generating device and the pole piece can be adjusted.
As a preferred scheme of the pole piece heating mechanism, the direction of the output end of the microwave generating device can be adjusted.
The utility model also aims to provide the pole piece rolling device which has accurate control on the heating temperature, improves the rolling quality of the pole piece and is beneficial to ensuring the compaction density and the thickness of the pole piece.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a pole piece rolling device comprises a pole piece heating mechanism and a rolling mechanism, wherein the pole piece heating mechanism and the rolling mechanism are provided by any technical scheme, the rolling mechanism is arranged at the downstream of the pole piece heating mechanism, and the rolling mechanism is used for rolling a heated pole piece.
As a preferred scheme of the pole piece rolling device, the rolling mechanism comprises two oppositely arranged rolling rollers, the pole piece is clamped between the two rolling rollers, and the two rolling rollers are used for rolling the pole piece.
The utility model has the beneficial effects that:
the utility model provides a pole piece heating mechanism which is used for heating a pole piece and comprises microwave generating devices and a driving device, wherein the two microwave generating devices form a microwave generating group, the two microwave generating devices in the same microwave generating group are oppositely arranged on two sides of the pole piece, the output ends of the microwave generating devices face a pole lug of the pole piece and are used for heating the pole lug and a joint part of the pole lug and a main body of the pole piece. In addition, the output end of the driving device is connected to the microwave generating device, and the driving device is used for driving the microwave generating device to move along the width direction of the pole piece, so that the microwave generating device can adapt to pole pieces with different widths, and the adaptability of the pole piece heating mechanism is improved. Through the structure, the pole piece heating mechanism heats the lug and the joint part of the lug and the main body of the pole piece by using the microwave generating device, so that the temperature is quickly increased, and the temperature of the pole piece can be immediately stopped rising when the heating is stopped, so that the heating temperature is easy to control.
The utility model also provides a pole piece rolling device which comprises the pole piece heating mechanism and the rolling mechanism provided by the technical scheme, wherein the rolling mechanism is arranged at the downstream of the pole piece heating mechanism and is used for rolling the heated pole piece so as to obtain the pole piece with uniform compaction density and thickness. Because the pole piece rolling device comprises the pole piece heating mechanism provided by the technical scheme, the pole piece rolling device can accurately control the heating temperature of the pole piece, improve the rolling quality of the pole piece and be beneficial to ensuring the compaction density and the thickness of the pole piece.
Drawings
Fig. 1 is a schematic structural diagram of a pole piece heating mechanism according to an embodiment of the present invention.
In the figure:
1. a microwave generating device; 21. a tab; 22. a main body; 3. a position sensor.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the pole piece heating mechanism and the pole piece rolling device provided by the utility model is further described by combining the drawings and through a specific implementation mode.
The embodiment provides a pole piece heating mechanism, this pole piece heating mechanism is used for heating the pole piece, as shown in fig. 1, this pole piece heating mechanism includes two at least ripples generating device 1 and drive arrangement (not shown in the figure) a little, every two microwave generating device 1 constitute a microwave generation group, two microwave generating device 1 in same microwave generation group set up in the both sides of pole piece relatively, and microwave generating device 1's output sets up towards the utmost point ear 21 of pole piece, microwave generating device 1 is used for heating utmost point ear 21 and the handing-over position of the main part 22 of pole piece. It can be understood that two microwave generating devices 1 in the same microwave generating group are arranged in an open manner, and compared with a closed microwave heating mode, the structure only heats the lug 21 and the joint part of the lug 21 and the main body 22 of the pole piece, and can avoid large-area roll sticking during subsequent rolling under the condition of effectively reducing the broken belt.
Specifically, microwaves are applied to the present embodiment because of their distinct characteristics such as short wavelength (1m-1mm), high frequency (300MHz-300GHz), and quantum characteristics. The microwave technology is widely applied to radar, navigation, multipath communication, remote sensing, television and other aspects. Recently, microwave heating technology is gradually applied to physical processes such as paper, wood, resin extrusion, and the like. In recent years, the microwave heating technology is introduced in the production process of the microwave molybdenum industry, so that the reaction conversion rate and selectivity can be effectively improved, and the method has the advantages of energy conservation, environmental protection and the like.
The microwave heating has the characteristics of high heating speed, small heat loss, convenience in operation and the like, can shorten the process time, improve the productivity, reduce the cost and improve the product quality, and compared with the traditional heating mode, the microwave heating has the characteristics of uniform heating and high speed. In addition, the microwave heating has the biggest characteristic that the microwave is heat generated inside an object to be heated, a heat source is from the inside of the object, the heating is uniform, the phenomenon of half-cooked inside the outer coke is avoided, the product quality is improved, meanwhile, the heating time is greatly shortened due to the fact that the inside and the outside are heated simultaneously, the heating efficiency is high, and the product yield is improved. The inertia of microwave heating is very small, the rapid control of temperature rise and fall can be realized, and the automatic control of continuous production is facilitated.
With the above structure, the pole piece heating mechanism heats the tab 21 and the joint part of the tab 21 and the main body 22 of the pole piece by microwave using the microwave generating device 1, so that the temperature rise is fast, and when the heating is stopped, the temperature of the pole piece can be immediately stopped rising, so that the heating temperature is easy to control.
Preferably, the microwave generating groups are provided with two groups, the two groups of microwave generating groups are respectively arranged at two ends of the pole piece in the width direction, and the two groups of microwave generating groups respectively heat the lug 21 at the two ends of the pole piece in the width direction and the joint part of the lug 21 and the main body 22 of the pole piece, so that the lug 21 parts at the two ends of the pole piece can be simultaneously heated by the microwave generating device 1, and the heating efficiency is improved.
In this embodiment, the pole piece heating mechanism further includes a driving device, an output end of the driving device is connected to the microwave generating device 1, and the driving device is used for driving the microwave generating device 1 to move along the width direction of the pole piece, so that the microwave generating device 1 can adapt to pole pieces with different widths, and the adaptability of the pole piece heating mechanism is improved. Specifically, the output end of the driving device is connected with two microwave generating devices 1 in the same microwave generating group, and the output end of the driving device is used for driving the two microwave generating devices 1 in the same microwave generating group to move synchronously, so that the heated areas on the two side surfaces of the pole piece move synchronously.
Preferably, the distance between the output end of the microwave generating device 1 and the pole piece is adjustable. Specifically, the distance between the output end of the microwave generating device 1 and the pole piece ranges from 10cm to 20cm, and the distance range enables the pole piece to have a good heating effect under the action of microwaves. Furthermore, the orientation of the output ends of the microwave generating devices 1 is adjustable, so that the pole pieces can pass through the output ends of two microwave generating devices 1 in the same microwave generating group, and microwave heating is performed on active materials (the material areas of the joint parts of the pole lugs 21 and the main body 22 of the pole piece) on the pole pieces, wherein the widths of the two sides of the metal foil materials on the pole pieces are 0cm-15 cm.
In this embodiment, the pole piece heating mechanism further includes a position sensor 3, the position sensor 3 is connected to a driving device, the position sensor 3 is used for measuring the position of the tab 21 and transmitting the position information of the tab 21 to the driving device, so that the driving device can adjust the position of the microwave generating device 1 according to the width of the pole piece, the microwave generated by the microwave generating device 1 is always located in the material area of the junction portion between the tab 21 and the main body 22 of the pole piece, and the accuracy of the position of the heating portion is ensured. Preferably, the position sensor 3 is a grating sensor, and the grating sensor has the advantage of high detection precision, and is favorable for ensuring the processing accuracy of the pole piece heating mechanism.
Preferably, the pole piece heating mechanism further comprises a temperature measuring instrument (not shown in the figure), and the temperature measuring instrument is used for measuring the temperature of the surface of the pole piece, so that an operator can conveniently control the temperature of the surface of the pole piece. Specifically, the thermodetector is an infrared thermodetector which can avoid contact with the surface of the pole piece, so that the heating process of the pole piece is convenient.
The embodiment also provides a pole piece rolling device, which comprises a pole piece heating mechanism and a rolling mechanism (not shown in the figure) provided by the technical scheme, wherein the rolling mechanism is arranged at the downstream of the pole piece heating mechanism and is used for rolling the heated pole piece so as to obtain the pole piece with uniform compaction density and thickness. Specifically, the roll-in mechanism includes two roll-in rollers that set up relatively, and the pole piece presss from both sides and locates between two roll-in rollers, and two roll-in rollers are used for rolling to the pole piece.
Because the pole piece rolling device comprises the pole piece heating mechanism provided by the technical scheme, the pole piece rolling device can accurately control the heating temperature of the pole piece, improve the rolling quality of the pole piece and be beneficial to ensuring the compaction density and the thickness of the pole piece.
The heating and rolling process of the pole piece is further described below.
And coating active materials on two sides of the metal foil to prepare the pole piece. That is, the pole piece is first obtained by a coating process.
The width of the pole piece is sensed by the position sensor 3 and the microwave generating device 1 is moved to a suitable position by the driving device. The microwave power of the microwave generating device 1 is adjusted, and the tab 21 and the joint portion of the tab 21 and the main body 22 of the pole piece are heated by the microwave generating device 1. And a thermodetector is adopted to monitor the temperature of the surface of the pole piece, so that the temperature of the surface of the pole piece is not more than 80 ℃, the phenomenon that the temperature is too high to soften the slurry on the surface of the pole piece is avoided, and the risk of subsequent roll sticking is avoided.
The pole piece passes through the middle of the microwave generating device 1 in the same microwave generating group, and microwave heating is carried out on the active materials on the two sides of the metal foil.
The pole piece from the microwave generating device 1 is directly rolled by a rolling mechanism to obtain the pole piece with uniform compaction density and thickness.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A pole piece heating mechanism for heating a pole piece, comprising:
the microwave heating device comprises at least two microwave generating devices (1), wherein every two microwave generating devices (1) form a microwave generating group, two microwave generating devices (1) in the same microwave generating group are oppositely arranged on two sides of a pole piece, and the output end of each microwave generating device (1) faces to a pole lug (21) of the pole piece and is used for heating the pole lug (21), the pole lug (21) and the joint part of the pole lug (21) and a main body (22) of the pole piece;
the output end of the driving device is connected to the microwave generating device (1), and the driving device is used for driving the microwave generating device (1) to move along the width direction of the pole piece.
2. The pole piece heating mechanism of claim 1, wherein said microwave generating groups are provided in two groups, and said two groups are respectively disposed at both ends of said pole piece in the width direction.
3. The pole piece heating mechanism according to claim 1, further comprising a position sensor (3), wherein the position sensor (3) is connected to the driving device, and the position sensor (3) is used for measuring the position of the pole tab (21) and transmitting the position information of the pole tab (21) to the driving device.
4. The pole piece heating mechanism according to claim 3, wherein the position sensor (3) is a grating sensor.
5. The pole piece heating mechanism according to claim 1, wherein the output end of the driving device is connected to two microwave generating devices (1) in the same microwave generating group for driving the two microwave generating devices (1) in the same microwave generating group to move synchronously.
6. A pole piece heating mechanism as claimed in claim 1, further comprising a temperature detector for measuring the temperature of the surface of the pole piece.
7. The pole piece heating mechanism according to claim 1, characterized in that the distance of the output end of the microwave generating device (1) from the pole piece is adjustable.
8. A pole piece heating mechanism according to any one of claims 1 to 7, characterized in that the orientation of the output end of the microwave generating device (1) is adjustably arranged.
9. A pole piece rolling device, which is characterized by comprising a pole piece heating mechanism and a rolling mechanism according to any one of claims 1 to 8, wherein the rolling mechanism is arranged at the downstream of the pole piece heating mechanism, and the rolling mechanism is used for rolling the heated pole piece.
10. The pole piece rolling device according to claim 9, wherein the rolling mechanism comprises two oppositely arranged rolling rollers, the pole piece clamp is arranged between the two rolling rollers, and the two rolling rollers are used for rolling the pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121148256.9U CN215529362U (en) | 2021-05-26 | 2021-05-26 | Pole piece heating mechanism and pole piece rolling device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121148256.9U CN215529362U (en) | 2021-05-26 | 2021-05-26 | Pole piece heating mechanism and pole piece rolling device |
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| CN215529362U true CN215529362U (en) | 2022-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116213218A (en) * | 2023-01-31 | 2023-06-06 | 广东利元亨智能装备股份有限公司 | Pole piece fixing device, pole piece drying equipment and pole piece drying method |
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2021
- 2021-05-26 CN CN202121148256.9U patent/CN215529362U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116213218A (en) * | 2023-01-31 | 2023-06-06 | 广东利元亨智能装备股份有限公司 | Pole piece fixing device, pole piece drying equipment and pole piece drying method |
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