Rolling equipment and preparation method of lithium metal battery composite pole piece

Abstract

The invention discloses rolling equipment and a preparation method of a lithium metal battery composite pole piece. The preparation method of the lithium metal battery composite pole piece comprises the following steps: continuously providing a first material belt of which the surface is coated with first slurry, a lithium metal material belt and a second material belt of which the surface is coated with second slurry; enabling the first material belt, the lithium metal material belt and the second material belt to continuously pass through a rolling mechanism in a state that two opposite side surfaces of the lithium metal material belt are respectively contacted with the first slurry and the second slurry, so that the first slurry and the second slurry are respectively compounded on the two opposite side surfaces of the lithium metal material belt in a rolling manner, and preparing the lithium metal composite pole piece. The lithium metal pole piece similar slurry coating process is achieved, the process bottleneck that the lithium metal pole piece cannot be coated with aqueous slurry is broken through, the precision and production efficiency of the lithium metal pole piece are improved, and the waste rate is reduced.

Description

Technical Field

[0001] The present invention relates to a rolling device and a preparation method, and in particular to a rolling device and a preparation method for a lithium metal battery composite pole piece, belonging to the technical field of new energy lithium battery manufacturing. Background Art

[0002] With the global energy transformation and upgrading and the increasing carbon emission requirements, technology has higher and higher requirements for batteries. Traditional lithium-ion batteries can no longer meet the needs of various industries. The market is in urgent need of a new battery product to replace the existing lithium-ion batteries. Lithium metal batteries have high energy density, high safety, and their cycle life is also constantly improving. There is a lot of room for replacing existing lithium-ion batteries in the future, and the market development prospects are huge.

[0003] Lithium metal is silvery white, extremely soft, and reacts with water. It is very easy to be broken during the production process. The coil coating production process currently on the market cannot be used for lithium metal coil coating. The composite equipment currently on the market has low control accuracy, high tension, and low adjustment accuracy, and cannot be used for the processing of metallic lithium. Using existing equipment to process metallic lithium will often result in belt breakage and inability to produce continuously. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a rolling device and a preparation method for a lithium metal battery composite pole piece.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention discloses a method for preparing a composite pole piece of a lithium metal battery, comprising:

[0006] Continuously providing a first material strip having a surface coated with a first slurry, a lithium metal material strip, and a second material strip having a surface coated with a second slurry;

[0007] The first material strip, the lithium metal material strip and the second material strip are continuously passed through a rolling mechanism in a state in which the opposite side surfaces of the lithium metal material strip are in contact with the first slurry and the second slurry respectively, so that the first slurry and the second slurry are respectively compounded onto the opposite side surfaces of the lithium metal material strip by rolling, thereby producing the lithium metal composite electrode sheet.

[0008] Furthermore, it also includes: after compounding the first slurry on the surface of the first material strip and the second slurry on the surface of the second material strip onto the lithium metal material strip, respectively winding up the first material strip after removing the first slurry from the surface and the second material strip after removing the second slurry from the surface.

[0009] Furthermore, the lithium metal composite electrode sheet and the diaphragm are continuously composited and then rolled up.

[0010] The present invention also discloses a rolling device for lithium metal battery composite pole pieces, comprising a first unwinding mechanism, a second unwinding mechanism, a third unwinding mechanism, a rolling mechanism, a main traction mechanism, and a second winding mechanism;

[0011] Wherein, the first unwinding mechanism is at least used for unwinding a first material strip having a first slurry coated on its surface;

[0012] The second unwinding mechanism is at least used for unwinding the lithium metal strip;

[0013] The third unwinding mechanism is at least used for unwinding the second material strip having a second slurry coated on its surface;

[0014] The main traction mechanism is used at least to traction the first material belt, the lithium metal material belt and the second material belt, and make the first material belt, the lithium metal material belt and the second material belt continuously pass through the rolling mechanism in a state where the two opposite sides of the lithium metal material belt are in contact with the first slurry and the second slurry respectively;

[0015] The rolling mechanism is at least used to roll the first material belt, the lithium metal material belt and the second material belt passing through, so that the first slurry and the second slurry are respectively compounded on the opposite sides of the lithium metal material belt, thereby producing a lithium metal composite electrode sheet;

[0016] The second winding mechanism is at least used for winding the lithium metal composite pole piece.

[0017] Furthermore, the rolling device further comprises one or more of a fourth unwinding mechanism, a first winding mechanism, a third winding mechanism and a fourth winding mechanism;

[0018] The fourth unwinding mechanism is arranged downstream of the rolling mechanism, the fourth winding mechanism is arranged upstream of the rolling mechanism, the fourth unwinding mechanism is at least used for unwinding the diaphragm, and the fourth winding mechanism is at least used for winding the diaphragm separated from the lithium metal strip;

[0019] The first winding mechanism, the second winding mechanism and the third winding mechanism are all arranged downstream of the rolling mechanism. The first winding mechanism is at least used for winding up the first material strip after the first slurry is removed from the surface, and the third winding mechanism is at least used for winding up the second material strip after the second slurry is removed from the surface.

[0020] Furthermore, each of the unwinding mechanisms includes a first adjustment platform, a first deviation-correcting assembly and a first power assembly. The first deviation-correcting assembly is fixed below the first adjustment platform, and the first power assembly is placed at one end above the first adjustment platform.

[0021] Furthermore, each of the winding mechanisms comprises a second adjustment platform, a second deviation-correcting assembly and a second power assembly. The deviation-correcting assembly is fixed below the second adjustment platform, and the second power assembly is placed at one end above the second adjustment platform.

[0022] Furthermore, the rolling mechanism includes a first roller and a second roller, and the first roller and the second roller cooperate to roll the first material strip, the lithium metal material strip and the second material strip passing through.

[0023] Furthermore, the main traction device includes a fixed frame, the internal rotation of the fixed frame is connected to an active driving wheel and an auxiliary driving wheel, there is a gap between the active driving wheel and the auxiliary driving wheel for the coil to pass through, and a power component for driving the active driving wheel to rotate is provided on one side of the active driving wheel.

[0024] Furthermore, the rolling device further comprises one or more of at least one positioning and measuring roll diameter mechanism, at least one tape connection platform device, at least one first tension adjustment mechanism, at least one line deviation correction mechanism and at least one static electricity removal mechanism;

[0025] Wherein, the positioning roll diameter measuring mechanism is used to detect the thickness of the material roll on the corresponding unwinding mechanism or rewinding mechanism;

[0026] The belt splicing platform device and the matching first tension adjustment mechanism and traveling deviation correction mechanism are sequentially arranged between an unwinding mechanism and a rolling mechanism;

[0027] The static electricity removal mechanism is arranged between an unwinding mechanism and a rolling mechanism.

[0028] Furthermore, the positioning and roll diameter measuring mechanism includes a roll thickness measuring base and a roll diameter measuring guide rod fixedly arranged on the roll thickness measuring base, the roll diameter measuring guide rod is fixedly connected to an infrared laser fixing block and a sensor fixing block, the infrared laser fixing block is fixedly connected to an infrared laser generator, and the sensor fixing block is fixedly connected to a roll diameter measuring sensor.

[0029] Furthermore, the belt connecting platform device includes a platform base and a roller mounting seat, and at least two cylinder belt pressing assemblies for pressing the material belt are fixedly arranged on the platform base, and a first unpowered roller and a second unpowered roller are respectively arranged on both sides of the at least two cylinder belt pressing assemblies, and the first unpowered roller is rotatably connected to the platform base, and the second unpowered roller is rotatably connected to the roller mounting seat.

[0030] Furthermore, the first tension adjustment mechanism includes a fixed seat and an adjustment mounting seat arranged on the fixed seat, the adjustment mounting seat is provided with a first tension roller and an adjustment roller, the adjustment roller is rotatably connected to the adjustment mounting seat, one end of the first tension roller guide rod is fixedly connected to one end of the adjustment plate, the end of the adjustment plate away from the first tension roller guide rod is connected to the driving shaft of the cylinder, and the cylinder is connected with a potentiometer.

[0031] Furthermore, the traveling correction mechanism includes a frame correction fixing plate and a frame correction device arranged on the frame correction fixing plate, the frame correction device includes a correction guide mechanism, and one side of the correction guide mechanism is provided with a rotating component for driving the correction guide mechanism to rotate and a first sensor for detecting the edge position of the material strip.

[0032] Furthermore, the static electricity removal mechanism includes a static electricity removal base and a static electricity removal bracket fixedly connected to the static electricity removal base, and the static electricity removal bracket is fixedly connected to a static electricity remover.

[0033] Furthermore, a second tension adjustment mechanism is provided between the belt connecting platform device and the corresponding traveling deviation correction mechanism; the second tension adjustment mechanism includes a first tension detector and a second tension roller guide rod arranged on the first tension detector, a second roller is sleeved on the outer surface of the second tension roller guide rod, a limit block is provided at the end of the second roller away from the first tension detector, and the limit block is connected to the end of the second tension roller guide rod away from the first tension detector.

[0034] Compared with the prior art, the advantages of the present invention include:

[0035] 1) The present invention overcomes the shortcomings of the prior art, realizes a process similar to slurry coating of lithium metal pole pieces, breaks through the process bottleneck that water-based slurry cannot coat lithium metal pole pieces, improves the accuracy and production efficiency of lithium metal sheeting, and reduces the scrap rate;

[0036] 2) The rolling equipment for lithium metal battery composite pole pieces provided by the present invention, wherein the unwinding mechanism, the winding mechanism, the belt splicing platform device, the tension adjustment mechanism and the traveling correction mechanism cooperate to keep the tension in the required range during the lithium metal production process, reduce the probability of lithium metal belt breakage during the production process, enable continuous production, and improve production efficiency;

[0037] 3) The tension adjustment mechanism provided by the present invention can ensure that the linear speed of the coil at each position during the continuous production process is consistent, thereby ensuring that neither the material pile-up nor the coil material belt being broken occurs during the coil reeling and unreeling process;

[0038] 4) The static electricity removal mechanism provided by the present invention can not only improve production efficiency, reduce scrap rate and reduce the waste of raw materials, but also reduce the possibility of overheating of finished batteries;

[0039] 5) The tape splicing platform device in the present invention can not only splice the two ends of the tape when the tape is broken, but also splice the two ends of the tape when the tape is replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of a rolling device for a lithium metal battery composite pole piece provided by the present invention;

[0041] Figure 2 It is a structural schematic diagram of the positioning and rolling diameter measuring mechanism provided by the present invention;

[0042] Figure 3 It is a structural schematic diagram of the unwinding mechanism provided by the present invention;

[0043] Figure 4 It is a structural schematic diagram of the winding mechanism provided by the present invention;

[0044] Figure 5 It is a structural schematic diagram of the belt connection platform device provided by the present invention;

[0045] Figure 6 is a structural schematic diagram of a first tension adjustment mechanism provided by the present invention;

[0046] Figure 7 is a structural schematic diagram of a second tension adjustment mechanism provided by the present invention;

[0047] Figure 8 It is a structural schematic diagram of the traveling deviation correction mechanism provided by the present invention;

[0048] Fig. 9 It is a structural schematic diagram of the static electricity removal mechanism provided by the present invention;

[0049] Fig.10 It is a structural schematic diagram of the main traction device provided by the present invention;

[0050] Description of reference numerals: 1. first unwinding mechanism; 2. second unwinding mechanism; 3. third unwinding mechanism; 4. fourth unwinding mechanism; 5. first winding mechanism; 6. second winding mechanism; 7. third winding mechanism; 8. fourth winding mechanism; 9. rolling mechanism; 10. main traction device; 11. belt connection platform device; 12. first tension adjustment mechanism; 13. second tension adjustment mechanism; 14. traveling deviation correction mechanism; 15. static electricity removal mechanism;

[0051] 101. a first adjustment platform; 102. a first deviation-correcting component; 103. a first power component;

[0052] 1001, active driving wheel; 1002, auxiliary driving wheel; 1003, fixed frame;

[0053] 1111, first unpowered roller; 1112, second unpowered roller; 112, cylinder belt pressing assembly; 113, belt connection dust suction assembly; 114, roller mounting seat;

[0054] 121, adjusting roller; 122, first mounting plate; 123, second mounting plate; 124, first tension roller; 125, first fixing plate; 126, second fixing plate; 127, adjusting plate; 128, cylinder; 129, potentiometer;

[0055] 131, second over roller; 132, second tension roller guide rod; 133, limit block; 134, first tension detector;

[0056] 141. deviation correction guide mechanism; 142. frame deviation correction bottom plate; 143. frame deviation correction reinforcement rib; 144. frame deviation correction fixing plate;

[0057] 151. anti-static base; 152. anti-static bracket; 153. anti-static device;

[0058] 1611. roll thickness measuring base; 1612. roll diameter measuring guide rod; 1613. infrared laser fixing block; 1614. sensor fixing block; 1615. infrared laser generator; 1616. roll diameter measuring sensor. DETAILED DESCRIPTION

[0059] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0060] The present invention discloses a method for preparing a composite electrode of a lithium metal battery, comprising:

[0061] Continuously providing a first material strip having a surface coated with a first slurry, a lithium metal material strip, and a second material strip having a surface coated with a second slurry;

[0062] The first material strip, the lithium metal material strip and the second material strip are continuously passed through a rolling mechanism in a state where the two opposite sides of the lithium metal material strip are in contact with the first slurry and the second slurry respectively, so that the first slurry and the second slurry are respectively compounded on the two opposite sides of the lithium metal material strip by rolling, so as to obtain the lithium metal composite electrode sheet. The first slurry and the second slurry can be the same or different.

[0063] In some embodiments, the preparation method also includes, after compounding the first slurry on the surface of the first material strip and the second slurry on the surface of the second material strip onto the lithium metal material strip, respectively winding up the first material strip after removing the first slurry from the surface and the second material strip after removing the second slurry from the surface.

[0064] In some embodiments, the lithium metal composite electrode sheet and the separator are continuously composited and then rolled up.

[0065] Another aspect of the present invention also discloses a rolling device for lithium metal battery composite pole pieces, such as Figure 1 As shown, it includes a first unwinding mechanism 1, a second unwinding mechanism 2, a third unwinding mechanism 3, a rolling mechanism 9, a main traction mechanism and a second winding mechanism 6;

[0066] Wherein, the first unwinding mechanism 1 is at least used for unwinding a first material strip having a first slurry coated on its surface;

[0067] The second unwinding mechanism 2 is at least used for unwinding lithium metal strips; lithium metal strips have relatively high viscosity. The unwinding mechanism and the rewinding mechanism can be adjusted in real time according to whether the coil running deviates.

[0068] The third unwinding mechanism 3 is at least used for unwinding the second material strip having the second slurry coated on the surface;

[0069] The main traction mechanism is disposed between the rolling mechanism 9 and the second winding mechanism 6, and is used to at least traction the first material strip, the lithium metal material strip and the second material strip, and to make the first material strip, the lithium metal material strip and the second material strip continuously pass through the rolling mechanism 9 in a state where the opposite sides of the lithium metal material strip are in contact with the first slurry and the second slurry respectively. Specifically, as Fig.10 As shown, the main traction device 10 includes a fixed frame 1003, and the internal rotation of the fixed frame 1003 is connected to an active driving wheel 1001 and an auxiliary driving wheel 1002, and there is a gap between the active driving wheel 1001 and the auxiliary driving wheel 1002 for the coil to pass through, and a power component for driving the active driving wheel 1001 to rotate is arranged on one side of the active driving wheel 1001.

[0070] The rolling mechanism 9 is disposed between the first unwinding mechanism 12 and the second winding mechanism 6, and is used at least to roll the first material strip, the lithium metal material strip, and the second material strip passing through, so that the first slurry and the second slurry are respectively compounded on the opposite sides of the lithium metal material strip, thereby producing a lithium metal composite electrode sheet. Specifically, the rolling mechanism 9 includes a first roller and a second roller, and the first roller and the second roller cooperate to roll the first material strip, the lithium metal material strip, and the second material strip passing through.

[0071] The second winding mechanism 6 is at least used to wind up the lithium metal composite electrode sheet. Figure 3As shown, each of the unwinding mechanisms includes a first adjustment platform 101 , a first deviation-correcting assembly 102 and a first power assembly 103 . The first deviation-correcting assembly 102 is fixed below the first adjustment platform 101 , and the first power assembly 103 is placed at one end above the first adjustment platform 101 .

[0072] In some embodiments, the rolling equipment also includes a fourth unwinding mechanism 4, a first winding mechanism 5, a third winding mechanism 7 and a fourth winding mechanism 8; wherein the fourth unwinding mechanism 4 is arranged downstream of the rolling mechanism 9 because: the slurry is attached to both sides of the lithium metal pole piece after passing through the rolling mechanism 9, but the slurry is not attached to the pole ears of the lithium metal pole piece, and the exposed lithium metal is still very sticky. The lithium metal coil with slurry attached after rolling needs to be rolled together with the diaphragm composite.

[0073] The fourth winding mechanism 8 is arranged upstream of the rolling mechanism 9, and the fourth unwinding mechanism 4 is at least used for unwinding the diaphragm, and the fourth winding mechanism 8 is at least used for winding the diaphragm separated from the lithium metal strip. Since the lithium metal coil placed on the second unwinding mechanism 2 is very sticky, the lithium metal coil is composed of lithium metal and diaphragm. During the operation of the equipment, the lithium metal and the diaphragm need to be peeled off, and the separated diaphragm is wound in the fourth winding mechanism 8 for complete winding. The separated diaphragm is effectively collected by the fourth winding mechanism 8, which can ensure that the separated diaphragm will not be scattered randomly in the equipment, so as to avoid affecting the normal operation of the entire equipment.

[0074] The first winding mechanism 5, the second winding mechanism 6, and the third winding mechanism 7 are all arranged downstream of the rolling mechanism 9. The first winding mechanism 5 is at least used for winding up the first material strip after the first slurry is removed from the surface, and the third winding mechanism 7 is at least used for winding up the second material strip after the second slurry is removed from the surface.

[0075] Specifically, Figure 4 As shown, each of the winding mechanisms includes a second adjustment platform 002 , a second deviation-correcting component 003 and a second power component 001 . The deviation-correcting component 003 is fixed below the second adjustment platform 002 , and the second power component 001 is placed at one end above the second adjustment platform 002 .

[0076] In some embodiments, the rolling device further includes at least one positioning and measuring roll diameter mechanism, at least one tape connection platform device, at least one first tension adjustment mechanism 12 , at least one forward deviation correction mechanism 14 and at least one static electricity removal mechanism 15 .

[0077] Among them, the positioning and measuring roll diameter mechanism is used to detect the thickness of the material roll on the corresponding unwinding mechanism or winding mechanism; for example, the first positioning and measuring roll diameter mechanism for positioning and measuring the first roll unwinding is arranged on the side of the first unwinding mechanism 1, the second positioning and measuring roll diameter mechanism for positioning and measuring the second roll is arranged on the side of the second unwinding mechanism 2, the third positioning and measuring roll diameter mechanism for positioning and measuring the third roll is arranged on the side of the third unwinding mechanism 3, the fourth positioning and measuring roll diameter mechanism for positioning and measuring the fourth roll is arranged on the side of the fourth unwinding mechanism 4, the fifth positioning and measuring roll diameter mechanism is arranged on the side of the first winding mechanism 5, the sixth positioning and measuring roll diameter mechanism is arranged on the side of the second winding mechanism 6, and the seventh positioning and measuring roll diameter mechanism is arranged on the side of the third winding mechanism 7. In the project of automatic control, it is often necessary to control the unwinding and winding. When the speed of the material pulling axis is constant, the radius of the roll is constantly decreasing during the unwinding process. In order to keep the line speed constant, the motor needs to be controlled by variable speed, and the core of the variable speed control is to measure the real-time radius change of the roll. Therefore, a coil diameter measuring mechanism needs to be added to the coiling mechanism and the unwinding mechanism to monitor the real-time radius change of the coil.

[0078] Specifically, Figure 2 As shown, the positioning and roll diameter measuring mechanism includes a roll thickness measuring base 1611 and a roll diameter measuring guide rod 1612 fixedly arranged on the roll thickness measuring base 1611, the roll diameter measuring guide rod 1612 is fixedly connected with an infrared laser fixing block 1613 and a sensor fixing block 1614, the infrared laser fixing block 1613 is fixedly connected with an infrared laser generator 1615, and the sensor fixing block 1614 is fixedly connected with a roll diameter measuring sensor 1616. The infrared laser generator 1615 emits red light to facilitate the positioning of the roll material, and the staff can quickly and time-savingly install the roll material to the required position according to the red light emitted by the infrared laser generator 1615. The roll diameter measuring sensor 1616 can detect the thickness of the roll material in real time during the operation of the equipment, and can keep the line speed constant when the diameter of the roll material is continuously reduced.

[0079] The belt splicing platform device and the matching first tension adjustment mechanism 12 and the traveling correction mechanism 14 are sequentially arranged between an unwinding mechanism and a rolling mechanism 9; specifically, as Figure 5As shown, the tape-joining platform device includes a platform base and a roller mounting seat 114, at least two cylinder tape-pressing assemblies 112 for pressing the material tape are fixedly arranged on the platform base, and a first unpowered roller 1111 and a second unpowered roller 1112 are respectively arranged on both sides of at least two cylinder tape-pressing assemblies 112, the first unpowered roller 1111 is rotatably connected to the platform base, and the second unpowered roller 1112 is rotatably connected to the roller mounting seat 114. The cylinder tape-pressing assembly 112 includes a pressing plate for pressing the material tape and a cylinder for driving the pressing plate to move up and down. When the material tape is broken and needs to be joined, the cylinder drives the pressing plate to move downward so that the pressing plate presses the material tape between the upper end surface of the platform base and the pressing plate to fix the material tape, and the two ends of the broken tape are joined by gluing manually or with external equipment. When the joining is completed, the cylinder drives the pressing plate to move upward so that there is a gap between the pressing plate and the platform base for the material tape to pass through, so that the material tape can move normally. The tape splicing platform device can be used not only when the tape is broken but also when the tape is replaced. Specifically, the total lengths of different rolls are inconsistent. If one of the rolls is used up and the other rolls are not used up, the used roll can be cut at the tape splicing platform device, and then a new roll can be connected, and the new roll can be joined with the old roll by pasting.

[0080] Specifically, the interior of the platform base is configured as a cavity, and the upper end surface of the platform base is located between the two cylinder belt pressing assemblies 112 and is provided with a through hole connected to the cavity, and a belt splicing dust suction assembly 113 for removing dust on the material belt is provided in the cavity on the platform base, and the belt splicing dust suction assembly 113 can absorb dust generated when the material belt is spliced.

[0081] Specifically, Figure 6As shown, the first tension adjustment mechanism 12 includes a fixed seat and an adjustment mounting seat arranged on the fixed seat, the adjustment mounting seat is provided with a first tension roller 124 and an adjustment roller 121, the adjustment roller 121 is rotatably connected to the adjustment mounting seat, one end of the guide rod of the first tension roller 124 is fixedly connected to one end of the adjustment plate 127, the end of the adjustment plate 127 away from the guide rod of the first tension roller 124 is connected to the driving shaft of the cylinder 128, and the cylinder 128 is connected with a potentiometer 129. Specifically, the fixed seat includes a first fixed plate 125 and a second fixed plate 126, and the two ends of the guide rod of the first tension roller 124 are respectively connected to the first fixed plate 125 and the second fixed plate 126. When the upper chamber of the cylinder is connected to compressed air, the tension acting on the material strip is the sum of the vertical component of the roller gravity and the vertical force of the cylinder. Since the swing angle of the floating roller (first tension roller) is small. The vertical component of force is basically unchanged during the swing process, so the tension of the material strip can be adjusted by directly changing the pressure of the cylinder, and the tension is independent of the diameter of the coil. During the winding process, when the tension changes, the adjusting roller 121 swings accordingly, and the potentiometer 129 indirectly detects the tension change, and controls the winding speed after PID adjustment to keep the tension of the material strip constant.

[0082] Specifically, the adjusting mounting seat includes a first mounting plate 122 and a second mounting plate 123 , and two ends of the adjusting roller 121 are connected to the first mounting plate 122 and the second mounting plate 123 , respectively.

[0083] The tension adjustment mechanism provided in the present application can ensure that the linear speed of the coil at each position during the continuous production process is consistent, thereby ensuring that neither material piling nor the coil material belt being broken will occur during the coil reeling and unreeling process.

[0084] Specifically, Figure 8 As shown, the traveling correction mechanism 14 includes a frame correction fixing plate 144 and a frame correction device arranged on the frame correction fixing plate 144, and the frame correction device includes a correction guide mechanism 141, and one side of the correction guide mechanism 141 is provided with a rotating component for driving the correction guide mechanism 141 to rotate and a first sensor for detecting the edge position of the material belt; the rotating component can be a driving motor or a cylinder, and the rotating component in this embodiment is a motor. The frame correction device detects the edge position of the material belt through the first sensor, reads the deviation between the actual position and the set position, and converts the deviation into a voltage signal proportional to it, and then sends the signal to the controller. After the controller amplifies and calibrates the signal, it outputs it to the drive motor. The drive motor drives the correction guide mechanism 141 to perform a correction action according to the size of the input signal, and guides the material belt to a preset position.

[0085] Specifically, a frame correction base plate 142 is provided at one end of the frame correction fixing plate 144 away from the frame correction device, and a frame correction reinforcement rib 143 for connecting the frame correction base plate 142 and the frame correction fixing plate 144 is provided between the frame correction base plate 142 and the frame correction fixing plate 144.

[0086] During the production and manufacturing process of lithium batteries, static electricity can cause conductive pollutants to be adsorbed on the coils. After the contaminated coils are made into batteries, hot spots and thermal runaway are easily formed, causing battery failure or even explosion. Therefore, it is necessary to set up a static electricity removal mechanism 15. Specifically, lithium metal coils belong to diaphragm and lithium metal composite coils. Before the automated equipment is rolled, the equipment needs to separate the lithium metal and the diaphragm. In this process, both the lithium metal and the diaphragm will generate static electricity. Therefore, it is necessary to set up a static electricity removal mechanism 15 between the unwinding mechanism and the rolling mechanism 9. At the same time, after the automated equipment is rolled, static electricity will be generated during the peeling of the new diaphragm and the composite process with lithium metal. Therefore, it is necessary to set up a static electricity removal mechanism between the rolling mechanism 9 and the winding mechanism 6 and the fourth unwinding mechanism 4 and the second winding mechanism 6. After static electricity is generated, lithium metal materials are extremely easy to adsorb conductive pollutants from the air, thereby endangering the quality and safety of the terminal product.

[0087] Specifically, Fig. 9 As shown, the static electricity removal mechanism 15 includes a static electricity removal base 151 and a static electricity removal bracket 152 fixedly connected to the static electricity removal base 151, and a static electricity removal device 153 is fixedly connected to the static electricity removal bracket 152. After using the static electricity removal mechanism, not only can the production efficiency be improved, the scrap rate and the waste of raw materials be reduced, but also the possibility of overheating of the finished battery can be reduced.

[0088] In some embodiments, a second tension adjustment mechanism 13 is further provided between the belt connection platform device 11 and the corresponding traveling deviation correction mechanism 14. Specifically, Figure 7 As shown, the second tension adjustment mechanism 13 includes a first tension detector 134 and a second tension roller guide rod 132 arranged on the first tension detector 134, the outer surface of the second tension roller guide rod 132 is sleeved with a second roller 131, and a limit block 133 is provided at the end of the second roller 131 away from the first tension detector 134, and the limit block 133 is connected to the end of the second tension roller guide rod 132 away from the first tension detector 134.

[0089] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a lithium metal battery composite electrode sheet, characterized in that: include: Continuously providing a first material strip having a surface coated with a first slurry, a lithium metal material strip, and a second material strip having a surface coated with a second slurry; The first material strip, the lithium metal material strip and the second material strip are continuously passed through a rolling mechanism in a state in which the opposite side surfaces of the lithium metal material strip are in contact with the first slurry and the second slurry respectively, so that the first slurry and the second slurry are respectively compounded onto the opposite side surfaces of the lithium metal material strip by rolling, thereby producing the lithium metal composite electrode sheet.

2. The preparation method according to claim 1, characterized in that: Also includes: After compounding the first slurry on the surface of the first material strip and the second slurry on the surface of the second material strip onto the lithium metal material strip, respectively winding up the first material strip after the first slurry is removed from the surface and the second material strip after the second slurry is removed from the surface; And / or, the lithium metal composite electrode sheet and the separator are continuously composited and then rolled up.

3. A rolling device for lithium metal battery composite pole pieces, characterized in that: It comprises a first unwinding mechanism (1), a second unwinding mechanism (2), a third unwinding mechanism (3), a rolling mechanism (9), a main traction mechanism (10) and a second winding mechanism (6); Wherein, the first unwinding mechanism (1) is at least used for unwinding a first material strip having a first slurry coated on its surface; The second unwinding mechanism (2) is at least used for unwinding the lithium metal strip; The third unwinding mechanism (3) is at least used for unwinding a second material strip having a second slurry coated on its surface; The main traction mechanism (10) is used to at least traction the first material strip, the lithium metal material strip and the second material strip, and make the first material strip, the lithium metal material strip and the second material strip continuously pass through the rolling mechanism (9) in a state where the two opposite sides of the lithium metal material strip are in contact with the first slurry and the second slurry respectively; The rolling mechanism (9) is at least used to roll the first material strip, the lithium metal material strip and the second material strip passing through, so that the first slurry and the second slurry are respectively compounded on the opposite sides of the lithium metal material strip, thereby producing a lithium metal composite electrode sheet; The second winding mechanism (6) is at least used for winding the lithium metal composite pole piece.

4. The rolling equipment for lithium metal battery composite pole pieces according to claim 3, characterized in that: It also includes one or more of a fourth unwinding mechanism (4), a first winding mechanism (5), a third winding mechanism (7) and a fourth winding mechanism (8); The fourth unwinding mechanism (4) is arranged downstream of the rolling mechanism (9), and the fourth winding mechanism (8) is arranged upstream of the rolling mechanism (9). The fourth unwinding mechanism (4) is at least used for unwinding the diaphragm, and the fourth winding mechanism (8) is at least used for winding the diaphragm separated from the lithium metal strip. The first winding mechanism (5), the second winding mechanism (6), and the third winding mechanism (7) are all arranged downstream of the rolling mechanism (9); the first winding mechanism (5) is at least used for winding up the first material strip after the first slurry is removed from the surface; and the third winding mechanism (7) is at least used for winding up the second material strip after the second slurry is removed from the surface.

5. The rolling equipment for lithium metal battery composite pole pieces according to any one of claims 3-4, characterized in that: Each of the unwinding mechanisms comprises a first adjustment platform 101, a first deviation-correcting assembly 102 and a first power assembly 103. The first deviation-correcting assembly 102 is fixed below the first adjustment platform 101, and the first power assembly 103 is placed at one end above the first adjustment platform 101. And / or, each of the winding mechanisms includes a second adjustment platform 002, a second correction component 003 and a second power component 001, wherein the correction component 003 is fixed below the second adjustment platform 002, and the second power component 001 is placed at one end above the second adjustment platform 002.

6. The rolling equipment for lithium metal battery composite pole pieces according to claim 5, characterized in that: The rolling mechanism (9) comprises a first roller and a second roller, and the first roller and the second roller cooperate to roll the first material strip, the lithium metal material strip and the second material strip passing through; And / or, the main traction device (10) comprises a fixed frame, an active driving wheel and an auxiliary driving wheel are rotatably connected inside the fixed frame, a gap is provided between the active driving wheel and the auxiliary driving wheel for the coil to pass through, and a power assembly for driving the active driving wheel to rotate is provided on one side of the active driving wheel.

7. The rolling equipment for lithium metal battery composite pole pieces according to any one of claim 1, characterized in that: The rolling device further comprises one or more of at least one positioning and measuring roll diameter mechanism (16), at least one tape connection platform device (11), at least one first tension adjustment mechanism (12), at least one forward deviation correction mechanism (14) and at least one static electricity removal mechanism (15); Wherein, the positioning roll diameter measuring mechanism (16) is used to detect the thickness of the material roll on the corresponding unwinding mechanism or rewinding mechanism; The belt splicing platform device (11) and the matching first tension adjustment mechanism (12) and the traveling deviation correction mechanism (14) are sequentially arranged between an unwinding mechanism and a rolling mechanism; The static electricity removal mechanism (15) is arranged between an unwinding mechanism and a rolling mechanism.

8. The rolling equipment for lithium metal battery composite pole pieces according to claim 7, characterized in that: The positioning roll diameter measuring mechanism (16) comprises a roll thickness measuring base and a roll diameter measuring guide rod fixedly arranged on the roll thickness measuring base, the roll diameter measuring guide rod is fixedly connected to an infrared laser fixing block and a sensor fixing block, the infrared laser fixing block is fixedly connected to an infrared laser generator, and the sensor fixing block is fixedly connected to a roll diameter measuring sensor; And / or, the belt connecting platform device (11) includes a platform base and a roller mounting seat, at least two cylinder belt pressing assemblies for pressing the material belt are fixedly arranged on the platform base, and a first unpowered roller and a second unpowered roller are respectively arranged on both sides of the at least two cylinder belt pressing assemblies, the first unpowered roller is rotatably connected to the platform base, and the second unpowered roller is rotatably connected to the roller mounting seat.

9. The rolling equipment for lithium metal battery composite pole pieces according to claim 7, characterized in that: The first tension adjustment mechanism (12) comprises a fixed seat and an adjustment mounting seat arranged on the fixed seat, the adjustment mounting seat is provided with a first tension roller and an adjustment roller, the adjustment roller is rotatably connected to the adjustment mounting seat, one end of the first tension roller guide rod is fixedly connected to one end of the adjustment plate, one end of the adjustment plate away from the first tension roller guide rod is connected to the drive shaft of the cylinder, and the cylinder is connected with a potentiometer; And / or, the traveling deflection correction mechanism (14) comprises a frame deflection correction fixing plate and a frame deflection correction device arranged on the frame deflection correction fixing plate, the frame deflection correction device comprises a deflection correction guide mechanism, and one side of the deflection correction guide mechanism is provided with a rotating component for driving the deflection correction guide mechanism to rotate and a first sensor for detecting the edge position of the material strip; And / or, the static electricity removal mechanism (15) comprises a static electricity removal base and a static electricity removal bracket fixedly connected to the static electricity removal base, and the static electricity removal bracket is fixedly connected to a static electricity remover.

10. The rolling equipment for lithium metal battery composite pole pieces according to claim 7, characterized in that: A second tension adjustment mechanism (13) is also provided between the belt connection platform device (11) and the corresponding traveling deviation correction mechanism (14); And / or, the second tension adjustment mechanism (13) comprises a first tension detector and a second tension roller guide rod arranged on the first tension detector, the outer surface of the second tension roller guide rod is sleeved with a second roller, a limit block is provided at one end of the second roller away from the first tension detector, and the limit block is connected to the end of the second tension roller guide rod away from the first tension detector.

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