CN112216872A - Hot-cold pressing equipment of lithium ion battery and hot pressing method of lithium ion battery - Google Patents
Hot-cold pressing equipment of lithium ion battery and hot pressing method of lithium ion battery Download PDFInfo
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- CN112216872A CN112216872A CN201910621246.3A CN201910621246A CN112216872A CN 112216872 A CN112216872 A CN 112216872A CN 201910621246 A CN201910621246 A CN 201910621246A CN 112216872 A CN112216872 A CN 112216872A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
A hot and cold pressing device of a lithium ion battery and a hot pressing method of the lithium ion battery aim at solving the technical problem that when the lithium ion battery is subjected to hot pressing in the prior art, an assembly gap is introduced into a pole piece and a diaphragm, so that the actual thickness of a battery cell is larger than the designed thickness of the battery cell, and further the loss of the volume energy density of the battery cell is caused. The battery pack comprises a rack, wherein a hot-pressing fixture and a cold-pressing fixture are arranged on the rack, the hot-pressing fixture and the cold-pressing fixture respectively comprise a laminate which can be in contact with a battery and is vertical to the mounting surface of the rack, the laminates positioned on two sides of the battery can move in the thickness direction of the battery under the driving of a driving device, the laminates in the hot-pressing fixture are connected with a heating device, and the laminates of the cold-pressing fixture are connected with a cooling device; also disclosed is a hot-pressing method for the lithium ion battery. The hot-cold pressing equipment combines the hot pressing procedure and the cold pressing procedure in the same equipment, shortens the connection time between the procedures and improves the processing speed.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to hot-cold pressing equipment and a hot-pressing method for a lithium ion battery.
Background
Separators for lithium ion batteries are typically thin, porous insulating materials that have high ion permeability and good mechanical strength, and long-term stability to various chemicals and chemical solvents; the positive electrode and the negative electrode of the battery are separated by utilizing the non-conductivity of the diaphragm, so that the short circuit caused by the contact of the two electrodes is prevented; meanwhile, lithium ions can easily pass through the diaphragm by virtue of the microporous structure of the diaphragm, so that good ionic conductivity between the positive electrode and the negative electrode is kept. When the external short circuit or the error connection causes the large current exceeding the threshold value to be generated in the battery, and the internal temperature of the battery is raised to a certain degree, the diaphragm is thermally melted to close the microporous structure, so that the current is cut off, the battery stops working, and the safety of the battery is ensured. Therefore, the separator has a great influence on the service life of the battery; particularly, in a high power battery with high energy, high current density and uninterrupted voltage, the performance of the battery needs to be realized by optimizing the performance of the anode and cathode materials. Therefore, the diaphragm of the high-power battery is required to be as thin as possible, and under the condition of large current, the lithium ion battery is easy to generate a large amount of lithium dendrites which puncture the diaphragm to cause the internal short circuit of the battery to cause potential safety hazards; therefore, the separator is required to have good high-temperature stability, so that a stable high-power battery with excellent performance can be obtained.
To meet the above requirements, ceramic separators are commonly used for cell assembly and pre-charge formation in a free state. However, in the process of pre-charging formation, an assembly gap is often introduced into the pole piece and the diaphragm, so that the actual thickness of the battery cell is greater than the designed thickness of the battery cell, and further the loss of the volume energy density of the battery cell is caused; gas generated in the pre-charging formation process is retained between the pole piece and the diaphragm, so that the SEI film is formed and the negative graphite is embedded with lithium unevenly. In addition, although the ceramic coating improves the thermal stability of the separator to some extent, thereby improving the safety performance of the battery, when the thermal stability of the separator is improved by increasing the areal density of the ceramic coating, the output characteristics of the battery may be adversely affected; when the thermal stability of the separator is improved by increasing the thickness of the ceramic coating layer, the energy density of the battery may be adversely affected; when the thickness or the areal density of the coating layer is reduced, the thermal stability of the separator is adversely affected although the battery output characteristics or energy density are not changed. In conclusion, the search for a battery diaphragm which can give consideration to both thermal stability and energy density has great significance for the performance development of lithium batteries.
Chinese patent with application number CN 201710358258.2 discloses a double-sided adhesive diaphragm for a lithium ion battery and the lithium ion battery, which comprises a base film, wherein one side of the base film is coated with a water system PVDF adhesive layer, and the other side of the base film is coated with a polyacrylate adhesive layer; a lithium ion battery comprising a positive electrode, a negative electrode and the separator as described above, the positive electrode being opposite to the side of the separator coated with the aqueous PVDF adhesive layer, the negative electrode being opposite to the side of the separator coated with the polyacrylate adhesive layer; one surface of the diaphragm coated with the water-based PVDF adhesive layer is wound opposite to the positive electrode, and after liquid injection activation, the diaphragm is placed into a die cavity to be subjected to hot pressing and cold pressing; during hot pressing, the temperature of the upper die is lower than that of the lower die, the temperature of the upper die is 64-66 ℃, the temperature of the lower die is 69-71 ℃, the pressure is 0.04MPa, and the time is 5 min; when in cold pressing, the temperature of the upper die and the lower die is less than 15 ℃, and the pressure is 0.03-0.05 MPa; the time is 5 min; the side, coated with the polyacrylate adhesive layer, of the diaphragm is wound opposite to the negative electrode, and after liquid injection and activation, the diaphragm is placed into a die cavity to be subjected to hot pressing and cold pressing; during hot pressing, the temperature of the upper die is lower than that of the lower die, the temperature of the upper die is 67-69 ℃, the temperature of the lower die is 70-72 ℃, the pressure is 0.04MPa, and the time is 5 min; when in cold pressing, the temperature of the upper die and the lower die is less than 15 ℃, and the pressure is 0.03-0.05 MPa; the time is 5 min.
In the patent, one surface of a base film is coated with a water system PVDF adhesive layer, the other surface of the base film is coated with a polyacrylate adhesive layer, and the adhesive layers coated on the two surfaces of the base film reduce the short circuit rate of a winding core, improve the product percent of pass and improve the high-rate discharge performance and the cycle performance of a lithium ion battery; however, the above patent does not disclose the adhesion between the battery electrode and the separator, and when the adhesion is too low, the battery core is soft, which results in poor adhesion between the separator and the positive and negative electrodes; when the bonding force is too high, the battery core is too hard, and the electrolyte is difficult to soak, so that the cycle performance of the battery is influenced.
Chinese patent with application number CN 201610665821.6 discloses a lithium ion battery separator, its preparation method and application, including: the diaphragm substrate is provided with an aqueous functional layer compounded on the surface of the diaphragm substrate, the aqueous functional layer is provided with a plurality of micropores, and the aqueous functional layer has viscosity; the diaphragm substrate has a first surface and a second surface opposite the first surface; the water-based functional layer comprises an inorganic nano ceramic layer and a water-based functional binder layer; the inorganic nano ceramic layer is compounded on the first surface of the diaphragm substrate; the second surface of the diaphragm substrate is compounded with the aqueous functional adhesive layer; or the inorganic nano ceramic layer and the water-based functional adhesive layer are compounded on at least one surface of the diaphragm substrate; or the water-based functional layer is a mixed material layer made of a mixed material comprising inorganic nano-ceramics and a water-based functional binder; at least one surface of the diaphragm substrate is compounded with a mixed material layer. A preparation method of a lithium ion battery separator comprises the following steps: respectively coating inorganic nano ceramic slurry and water-based functional binder slurry on one surface or two surfaces of a diaphragm substrate, and drying to respectively form an inorganic nano ceramic layer and a water-based functional binder layer to obtain a lithium ion battery diaphragm; the aqueous functional binder slurry comprises an aqueous functional binder and water; or coating the mixed slurry on one or two surfaces of the diaphragm substrate, and drying to form a mixed material layer to obtain the lithium ion battery diaphragm; the mixed slurry comprises inorganic nano ceramic, a water-based functional binder and water.
In the patent, a sticky water-based functional layer with a plurality of micropores is arranged on the surface of a diaphragm substrate to obtain a lithium ion battery isolating membrane; the composite water-based functional layer on the isolating membrane has a large number of micropore channels and simultaneously has viscosity, so that the bonding is generated between the internal electrode of the battery and the isolating membrane, the electrode cannot deform, the interface cannot generate a gap, the channel for conducting lithium ions is not influenced, the local lithium precipitation phenomenon cannot occur in the circulating process, the battery pole group cannot deform and expand greatly in the circulating process, and the stability of the circulating life is facilitated; however, the above patent only limits the hot pressing temperature and time, and does not limit the adhesion between the battery electrode and the separator, and the hot pressing pressure during the hot pressing process; when the bonding force is too low, the battery core is softer, so that the diaphragm is not well bonded with the anode and the cathode; when the bonding force is too high, the battery core is too hard, and the electrolyte is difficult to soak, so that the cycle performance of the battery is influenced; when the hot-pressing pressure is too small, the bonding performance of the electrode and the diaphragm is poor; when the hot pressing pressure is excessively large, the performance of the battery is degraded.
Disclosure of Invention
In order to overcome the technical problem that the actual thickness of the battery core is larger than the designed thickness of the battery core and further the volume energy density loss of the battery core is caused because an assembly gap is introduced into a pole piece and a diaphragm when the lithium ion battery is subjected to hot pressing in the prior art, the invention provides hot-cold pressing equipment of the lithium ion battery and a hot-pressing method of the lithium ion battery.
In order to achieve the above object, the present invention adopts the following technical solutions.
The utility model provides a lithium ion battery's hot cold pressing equipment, includes the frame, be provided with hot pressing anchor clamps and cold pressing anchor clamps in the frame, hot pressing anchor clamps and cold pressing anchor clamps all include the plywood that can contact and the installation face of perpendicular to frame with the battery, and the plywood that is located the battery both sides removes along the thickness direction of battery under drive arrangement's drive, is connected with heating device on the plywood in the hot pressing anchor clamps, is connected with cooling device on the plywood of cold pressing anchor clamps.
The hot pressing fixture and the cold pressing fixture are arranged on the mounting surface of the rack, and both the hot pressing fixture and the cold pressing fixture comprise laminated plates which can be in contact with the battery and are perpendicular to the mounting surface of the rack; based on the working characteristics of the lithium ion batteries and the consideration of batch production, the existing lithium ion batteries are mostly of a laminated structure, when the lithium ion batteries are subjected to hot pressing, because the laminated plate is perpendicular to the mounting surface, the laminated plate can be completely attached to the side plane of the lithium ion batteries, the pressure distribution borne by the battery core of the lithium ion batteries is uniform, the diaphragm is fully contacted with the positive electrode and the negative electrode, the laminated plates on the two sides of the batteries are driven by the driving device to move along the thickness direction of the batteries, and the clearance between the diaphragm and the positive electrode and the negative electrode can be effectively reduced under the action of external pressure provided by the laminated plate. A heating device is connected to the laminate in the hot-pressing fixture, and a cooling device is connected to the laminate of the cold-pressing fixture; according to the invention, the hot-pressing fixture and the cold-pressing fixture are arranged in the same equipment at the same time, and the exchange of the lithium ion battery between the hot-pressing fixture and the cold-pressing fixture is completed through the external manipulator, so that two pressurizing processes are combined on the same equipment, the equipment is compact, and the handover time between the processes is effectively shortened.
Preferably, the driving device comprises a servo motor, a speed reducer, a gear box, a screw rod, a push plate and a guide shaft, the output end of the servo motor is connected with the input end of the speed reducer, the output end of the speed reducer is connected with the input end of the gear box, the screw rod is connected with the output end of the gear box, the screw rod is arranged on the push plate in a penetrating mode, the laminates and the guide shaft with one end connected to the push plate are connected in a sliding mode, and the battery is located in a channel.
The output end of the servo motor is connected with the input end of the speed reducer, the output end of the speed reducer is connected with the input end of the gear box, the screw rod is connected with the output end of the gear box, and the screw rod penetrates through the push plate; the servo motor drives the lead screw to move after being transmitted by the speed reducer and the gear box, the lead screw drives the push plate to move, the guide shaft with one end connected to the push plate moves in the thickness direction of the lithium ion battery under the driving of the push plate, and the guide shaft drives the laminate to move so as to apply pressure to the lithium ion battery in the channel, thereby completing the hot-pressing or cold-pressing operation.
Preferably, the tab leading end connected to the channel in the hot pressing fixture is connected to an external charging and discharging device, a silica gel layer is coated on the side plane of the laminate plate in the hot pressing fixture, which is in contact with the battery, and an electric heating sheet is arranged on the side plane of the laminate plate in the hot pressing fixture, which is far away from the silica gel layer.
The hot pressing clamp comprises a hot pressing clamp, a channel, a lug lead end, a driving device and a peripheral charging and discharging device, wherein the lug lead end connected with the channel in the hot pressing clamp is connected with the peripheral charging and discharging device, when the lithium ion battery in the charging process needs to be hot pressed, the lug on the lithium ion battery is connected with the lug lead end on the channel, the peripheral charging and discharging device charges the lithium ion battery, and the driving device drives a laminate to carry out hot pressing on the lithium. A side plane of the laminate in the hot-pressing fixture, which is in contact with the battery, is coated with a silica gel layer, and a side plane of the laminate in the hot-pressing fixture, which is far away from the silica gel layer, is provided with an electric heating sheet; the silica gel layer is in direct contact with the side plane of the lithium ion battery, so that a good damping effect can be achieved, and indentations can not be left on the surface of the lithium ion battery basically after hot pressing.
Preferably, a cooling circulation channel is arranged on the laminate of the cold-pressing fixture, and the cooling circulation channel comprises an inlet and an outlet which are respectively connected with a conduit through which an external cooling medium flows.
The inlet and the outlet of a cooling circulation channel on the laminate of the cold-pressing fixture are respectively connected with a conduit through which an external cooling medium flows, and the cooling rate of the lithium ion battery in the cold-pressing fixture can be changed by changing the cooling medium in the conduit.
A hot pressing method of a lithium ion battery using the hot and cold pressing apparatus of a lithium ion battery according to claim 3, comprising the steps of:
the method comprises the following steps: installing the diaphragm coated with the glue layer in the battery cell, placing the battery cell after liquid injection in a channel of a hot-pressing clamp of the hot-cold pressing equipment, carrying out first hot pressing on the battery cell so as to bond the diaphragm with the positive electrode and the negative electrode of the battery cell, controlling the bonding force of the positive electrode and the diaphragm within the range of 2N/m-25N/m by controlling the pressure of a laminate on one side of the channel on the battery cell, and controlling the bonding force of the negative electrode and the diaphragm within the range of 0.5N/m-15N/m by controlling the pressure of a laminate on the other side of the channel on the battery cell;
step two: carrying out hot pressing on the electric core subjected to the first hot pressing in the step I in three stages of pre-charging, pre-charging and formation, wherein the hot pressing operation on the electric core in the three stages comprises hot pressing when the electric core is in a charging process and hot pressing when the electric core is in a non-charging process; when the electric core in the charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-3 MPa, and the hot pressing time is controlled to be 10 min-8 h; when the electric core in the non-charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-5 MPa, and the hot pressing time is controlled to be 3-120 min.
In the first step, a glue layer is coated on a diaphragm, the battery core after liquid injection is placed in a channel of a hot-pressing clamp of the hot-cold pressing equipment, the battery core is subjected to first hot pressing, two side planes of the diaphragm are respectively bonded with a positive electrode and a negative electrode of the battery core, and the glue layer is coated on the diaphragm, so that the bonding effect of the diaphragm with the positive electrode and the negative electrode is good, the assembly gap between a pole piece and the diaphragm can be eliminated to a certain extent, the actual thickness of the battery core is basically consistent with the design thickness of the battery core, and the loss of the battery core on the volume energy density is avoided. Controlling the adhesive force between the anode and the diaphragm within the range of 2N/m-25N/m, and controlling the adhesive force between the cathode and the diaphragm within the range of 0.5N/m-15N/m; when the bonding force of the diaphragm and the pole piece is smaller than the bonding force range, the battery core is softer, and the diaphragm cannot be effectively bonded with the positive electrode and the negative electrode; when the adhesion force of the diaphragm and the pole piece exceeds the adhesion force range, the electrolyte is difficult to infiltrate the electrode, and further the cycle performance of the lithium ion battery is influenced.
After the lithium ion battery is bonded with the diaphragm and the electrode in the first step, the electric core of the lithium ion battery is required to be subjected to hot pressing in three stages of a pre-charging process, a pre-charging process and a formation process, and the hot pressing of the lithium ion battery in the three stages is divided into hot pressing in a charging process and hot pressing in a non-charging process according to the charging process of the lithium ion battery; when the battery cell is subjected to hot pressing in the charging process, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-3 MPa, and the hot pressing time is controlled to be 10 min-8 h; when the electric core in the non-charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-5 MPa, and the hot pressing time is controlled to be 3-120 min; the temperature in the hot pressing process is too low, the pressure is too low, the time is too short, the bonding performance of the diaphragm and the electrode can be influenced, and the temperature is too high, the pressure is too high, the time is too long, and the performance of the battery is influenced.
Preferably, the diaphragm in the step (i) is provided with a ceramic coating layer, and the ceramic coating layer is positioned below the glue layer.
The ceramic coating has high strength and is non-conductive, the ceramic coating is coated on the diaphragm, two side planes of the diaphragm are closely connected with the positive and negative electrodes of the lithium ion battery, and the positive and negative electrodes of the battery cannot be short-circuited under the insulation effect of the diaphragm.
Preferably, the glue layer in step (r) mainly comprises a binder or a mixture of a binder and a ceramic.
The adhesive is mainly used for bonding the diaphragm and the pole piece, and when the adhesive layer comprises a mixture of the adhesive and ceramic, the adhesive layer is used for bonding the diaphragm and the pole piece on one hand, and an insulating layer is formed on the diaphragm on the other hand, so that short circuit of a positive electrode and a negative electrode of a battery in near contact is prevented.
In conclusion, the invention has the following beneficial effects: (1) the hot-cold pressing equipment combines the two working procedures of hot pressing and cold pressing of the battery in the same equipment, so that the time for switching the working procedures is shortened; (2) according to the hot-pressing method of the lithium ion battery, the positive electrode and the negative electrode are fixed on the diaphragm by coating the adhesive layer on the diaphragm, so that an assembly gap is prevented from being introduced between the pole piece and the diaphragm, the actual thickness of the battery cell is basically consistent with the design thickness of the battery cell, and the loss of the battery cell on the volume energy density is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
fig. 2 is a schematic structural view of the hot pressing jig of the present invention.
Fig. 3 is another schematic structural view of the hot pressing jig of the present invention.
FIG. 4 is a schematic view showing the structure of a cooling circulation passage in the cold press jig of the present invention.
In the figure:
1. the device comprises a rack, 1a, a mounting surface, 2, a hot-pressing fixture, 3, a cold-pressing fixture, 4, a laminate, 5, a servo motor, 6, a speed reducer, 7, a gear box, 8, a screw rod, 9, a push plate, 10, a guide shaft, 11, a lug leading end, 12, a channel, 13, a cooling circulation channel, 13a, an inlet, 13b and an outlet.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in fig. 1 to 3, a hot-cold pressing device for a lithium ion battery comprises a frame 1, wherein a hot-pressing fixture 2 and a cold-pressing fixture 3 are arranged on the frame, the hot-pressing fixture and the cold-pressing fixture both comprise laminates 4 which can be in contact with the battery and are perpendicular to an installation surface 1a of the frame, the laminates positioned at two sides of the battery move along the thickness direction of the battery under the driving of a driving device, the laminates in the hot-pressing fixture are connected with a heating device, and the laminates of the cold-pressing fixture are connected with a cooling device; the driving device comprises a servo motor 5, a speed reducer 6, a gear box 7, a screw rod 8, a push plate 9 and a guide shaft 10, wherein the output end of the servo motor is connected with the input end of the speed reducer, the output end of the speed reducer is connected with the input end of the gear box, the screw rod is connected with the output end of the gear box, the screw rod is arranged on the push plate in a penetrating mode, a laminate is connected with the guide shaft with one end connected to the push plate in a sliding mode, and a battery is located in a; a tab leading end 11 connected with a channel in the hot pressing fixture is connected with external charging and discharging equipment, a silica gel layer is coated on the side plane of a laminated plate in the hot pressing fixture, which is contacted with a battery, and an electric heating plate is arranged on the side plane of the laminated plate in the hot pressing fixture, which is far away from the silica gel layer; and a cooling circulation channel 13 is arranged on the laminate of the cold-pressing clamp and comprises an inlet 13a and an outlet 13b, and the inlet and the outlet are respectively connected with a conduit through which an external cooling medium flows.
A hot-pressing method of the lithium ion battery of the hot-cold pressing equipment of the lithium ion battery comprises the following steps:
the method comprises the following steps: installing the diaphragm coated with the glue layer in the battery cell, placing the battery cell after liquid injection in a channel of a hot-pressing clamp of the hot-cold pressing equipment, carrying out first hot pressing on the battery cell so as to bond the diaphragm with the positive electrode and the negative electrode of the battery cell, controlling the bonding force of the positive electrode and the diaphragm within the range of 2N/m-25N/m by controlling the pressure of a laminate on one side of the channel on the battery cell, and controlling the bonding force of the negative electrode and the diaphragm within the range of 0.5N/m-15N/m by controlling the pressure of a laminate on the other side of the channel on the battery cell;
step two: carrying out hot pressing on the electric core subjected to the first hot pressing in the step I in three stages of pre-charging, pre-charging and formation, wherein the hot pressing operation on the electric core in the three stages comprises hot pressing when the electric core is in a charging process and hot pressing when the electric core is in a non-charging process; when the electric core in the charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-3 MPa, and the hot pressing time is controlled to be 10 min-8 h; when the electric core in the non-charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-5 MPa, and the hot pressing time is controlled to be 3-120 min.
A ceramic coating layer is arranged on the diaphragm in the first step and is positioned below the adhesive layer; the adhesive layer in the step (i) mainly comprises a binder or a mixture of the binder and ceramic.
In the invention, the frame is in a frame-shaped structure, the middle lower part of the frame is provided with an installation surface which is horizontal to the ground, and the hot-pressing clamp and the cold-pressing clamp are arranged on the installation surface side by side. In the hot pressing fixture, two adjacent laminates form a channel, the hot pressing fixture in the embodiment is provided with 24 channels, the width of the channel can be adjusted by adjusting the distance between the laminates on two sides of the channel, the laminates are vertical to the mounting surface of the rack, and the laminates are cubic; when lithium ion battery is needed to be hot-pressed, the battery is placed in the channel, the servo motor drives the lead screw to move after being transmitted through the speed reducer and the gear box, the lead screw drives the push plate to move, the guide shaft with one end connected to the push plate moves along the thickness direction of the lithium ion battery under the driving of the push plate, the guide shaft drives the laminate to move so as to press the lithium ion battery in the channel, the electric heating sheet arranged on the side plane of the laminate far away from the battery heats the laminate, the hot-pressing operation of the lithium ion battery is completed, in the process, the silica gel layer on the laminate can play a good damping role, on one hand, the lithium ion battery can be prevented from being impacted by larger momentum due to the fact that the laminate moves too fast, on the other.
Claims (7)
1. The utility model provides a lithium ion battery's hot cold pressing equipment, includes the frame, its characterized in that, be provided with hot pressing anchor clamps and cold pressing anchor clamps in the frame, hot pressing anchor clamps and cold pressing anchor clamps all include the plywood that can contact and the installation face of perpendicular to frame with the battery, and the plywood that is located the battery both sides removes along the thickness direction of battery under drive arrangement's drive, is connected with heating device on the plywood in the hot pressing anchor clamps, is connected with cooling device on the plywood of cold pressing anchor clamps.
2. The hot-cold pressing device of the lithium ion battery as claimed in claim 1, wherein the driving device comprises a servo motor, a reducer, a gear box, a screw rod, a push plate and a guide shaft, the output end of the servo motor is connected with the input end of the reducer, the output end of the reducer is connected with the input end of the gear box, the screw rod is connected with the output end of the gear box, the screw rod is arranged on the push plate in a penetrating manner, the laminates are slidably connected with the guide shaft, one end of each laminate is connected with the push plate, and the battery is located in a channel formed by two.
3. The hot-cold pressing device of the lithium ion battery according to claim 2, wherein the tab leading end connected to the channel in the hot pressing fixture is connected to an external charging and discharging device, a silicone layer is coated on a side plane of the laminate in the hot pressing fixture, which is in contact with the battery, and an electric heating plate is disposed on a side plane of the laminate in the hot pressing fixture, which is away from the silicone layer.
4. The hot-cold pressing device for the lithium ion battery according to claim 1, wherein a cooling circulation channel is arranged on the laminate of the cold pressing fixture, the cooling circulation channel comprises an inlet and an outlet, and the inlet and the outlet are respectively connected with a conduit for flowing an external cooling medium.
5. A hot pressing method of a lithium ion battery using the hot and cold pressing apparatus of a lithium ion battery according to claim 3, comprising the steps of:
the method comprises the following steps: installing the diaphragm coated with the glue layer in the battery cell, placing the battery cell after liquid injection in a channel of a hot-pressing clamp of the hot-cold pressing equipment, carrying out first hot pressing on the battery cell so as to bond the diaphragm with the positive electrode and the negative electrode of the battery cell, controlling the bonding force of the positive electrode and the diaphragm within the range of 2N/m-25N/m by controlling the pressure of a laminate on one side of the channel on the battery cell, and controlling the bonding force of the negative electrode and the diaphragm within the range of 0.5N/m-15N/m by controlling the pressure of a laminate on the other side of the channel on the battery cell;
step two: carrying out hot pressing on the electric core subjected to the first hot pressing in the step I in three stages of pre-charging, pre-charging and formation, wherein the hot pressing operation on the electric core in the three stages comprises hot pressing when the electric core is in a charging process and hot pressing when the electric core is in a non-charging process; when the electric core in the charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-3 MPa, and the hot pressing time is controlled to be 10 min-8 h; when the electric core in the non-charging process is subjected to hot pressing, the hot pressing temperature is controlled to be 40-100 ℃, the hot pressing pressure is controlled to be 0.4-5 MPa, and the hot pressing time is controlled to be 3-120 min.
6. The hot-pressing method of the lithium ion battery as claimed in claim 5, wherein the separator in the step (i) is provided with a ceramic coating layer, and the ceramic coating layer is positioned below the adhesive layer.
7. The method according to claim 5, wherein the adhesive layer in step (i) mainly comprises a binder or a mixture of a binder and a ceramic.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103811816A (en) * | 2014-02-12 | 2014-05-21 | 宁德新能源科技有限公司 | Lithium ion battery hot and cold-press formation equipment |
| CN104953183A (en) * | 2015-06-24 | 2015-09-30 | 浙江杭可科技有限公司 | Soft-packed lithium ion battery hot and cold pressing formation device |
| CN107171025A (en) * | 2017-04-28 | 2017-09-15 | 天津力神电池股份有限公司 | Optimize the fixture chemical synthesizing method of performance of lithium ion battery |
| US20180191023A1 (en) * | 2016-05-31 | 2018-07-05 | Zhejiang Hangke Technologies Co., Ltd | Formation Machine for Polymer Li-ion Battery with 64 Channels |
| CN108470874A (en) * | 2018-04-11 | 2018-08-31 | 北京国能电池科技股份有限公司 | Improve method, the preparation process of lithium ion battery and the lithium ion battery of battery core extrusion performance |
| CN109560253A (en) * | 2018-07-10 | 2019-04-02 | 蜂巢能源科技有限公司 | Negative electrode tab component and preparation method thereof, the method and battery for preparing battery |
| CN109560327A (en) * | 2018-11-28 | 2019-04-02 | 桑顿新能源科技有限公司 | A kind of silicagel pad and its application in lithium ion battery preparation |
| CN109950634A (en) * | 2019-03-18 | 2019-06-28 | 惠州锂威新能源科技有限公司 | A kind of lithium ion battery cell production technology |
-
2019
- 2019-07-10 CN CN201910621246.3A patent/CN112216872A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103811816A (en) * | 2014-02-12 | 2014-05-21 | 宁德新能源科技有限公司 | Lithium ion battery hot and cold-press formation equipment |
| CN104953183A (en) * | 2015-06-24 | 2015-09-30 | 浙江杭可科技有限公司 | Soft-packed lithium ion battery hot and cold pressing formation device |
| US20180191023A1 (en) * | 2016-05-31 | 2018-07-05 | Zhejiang Hangke Technologies Co., Ltd | Formation Machine for Polymer Li-ion Battery with 64 Channels |
| CN107171025A (en) * | 2017-04-28 | 2017-09-15 | 天津力神电池股份有限公司 | Optimize the fixture chemical synthesizing method of performance of lithium ion battery |
| CN108470874A (en) * | 2018-04-11 | 2018-08-31 | 北京国能电池科技股份有限公司 | Improve method, the preparation process of lithium ion battery and the lithium ion battery of battery core extrusion performance |
| CN109560253A (en) * | 2018-07-10 | 2019-04-02 | 蜂巢能源科技有限公司 | Negative electrode tab component and preparation method thereof, the method and battery for preparing battery |
| CN109560327A (en) * | 2018-11-28 | 2019-04-02 | 桑顿新能源科技有限公司 | A kind of silicagel pad and its application in lithium ion battery preparation |
| CN109950634A (en) * | 2019-03-18 | 2019-06-28 | 惠州锂威新能源科技有限公司 | A kind of lithium ion battery cell production technology |
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