A method and system for preparing a low-temperature rate lithium-ion battery

Abstract

The present invention relates to the technical field of lithium-ion batteries, and specifically to a method and system for preparing a low-temperature rate lithium-ion battery, comprising the following steps: S1, putting positive and negative electrode materials into a stirrer to form slurry; S2, conveyor belt conveys the slurry to a transfer plate, the transfer plate makes the slurry close to the bottom of the foil, and the lower scraper evenly scrapes the slurry under the foil; S3, the slurry is sent to the top of the foil, and the upper scraper evenly scrapes the slurry on the top of the foil; S4, the foil passes through a drying box, and the slurry on the foil is dried and solidified. The invention provides a method and system for preparing a low-temperature rate lithium-ion battery, wherein the conveyor belt transfers the slurry to the transfer plate, the slider moves the transfer plate upward, the transfer plate moves the slurry to the bottom of the foil, and gradually switches from an inclined state to a horizontal state, the slurry on the transfer plate contacts the foil, the foil moves with part of the slurry, and the lower scraper cooperates with the support plate to push the slurry at the bottom of the foil, so that the slurry is evenly and firmly adhered to the foil.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a method and system for preparing a low-temperature rate lithium ion battery. Background Art

[0002] Low-temperature lithium-ion batteries are lithium batteries used in low-temperature conditions. The biggest difference between low-temperature lithium batteries and conventional lithium batteries is the difference in electrolyte. The electrolyte of low-temperature lithium batteries can ensure the efficiency of ion passage under low-temperature conditions, thereby ensuring the charging and discharging efficiency of low-temperature lithium batteries under low-temperature conditions.

[0003] According to the publication (announcement) number CN204353078U, the publication (announcement) date is 2015.05.27, and a lithium battery pole piece coating device is disclosed, including an unwinding and winding device, a coating shoe device, a drying channel and a corresponding drying device, wherein the coating shoe device includes a slurry tank and a coating roller arranged in the slurry tank. The device can improve the slurry coating quality and coating consistency of the lithium-ion battery pole piece, make the thermal and electrical properties of the pole piece stable and reliable, and thus improve the quality of lithium battery products, and can improve the capacity, safety and other performances of the lithium-ion battery to a certain extent.

[0004] In the prior art including the above-mentioned patents, when manufacturing lithium batteries, it is necessary to first make the positive and negative electrode materials into slurry, and then use a coating process to evenly apply the slurry on the foil, and then dry the slurry. The slurry is fixed on the foil, and then the foil can be cut, and the cut foil is rolled into a roll and placed in the battery case. The existing coating includes single-sided coating and double-sided coating. When double-sided coating is performed, the slurry is generally applied to the top surface of the foil first, and the slurry is fixed on the foil after drying. Then the foil is turned over so that the side of the foil not covered with the slurry faces up, and the slurry is applied to this side. Then the foil is heated again so that the newly applied slurry is also fixed on the foil. However, the slurry applied in the first step has been dried twice, and a large amount of water in the slurry is lost. The slurry hardens on the foil. In the subsequent process of rolling the foil into a roll, the hardened slurry cannot bend with the foil. , which causes cracks in the slurry and even causes it to fall off, affecting the use of the battery. In the existing coating process, when performing horizontal double-sided coating, it is difficult to fix the slurry on the bottom of the foil using the conventional roller coating method. Under the influence of gravity, gaps will appear between part of the slurry and the foil. Although it is attached to the foil by the traction of the adjacent slurry, this connection is still unreliable. During the drying process, the moisture in the slurry decreases, and the traction between the slurries decreases. This part of the slurry that is not firmly fixed on the foil can easily fall off the foil. Summary of the invention

[0005] The purpose of the present invention is to provide a method and system for preparing a low-temperature rate lithium-ion battery, aiming to solve the above-mentioned problems.

[0006] In order to achieve the above object, the present invention provides a method for preparing a low-temperature rate type lithium ion battery, comprising the following steps:

[0007] S1. Putting positive and negative electrode materials into a stirrer to form a slurry;

[0008] S2. The conveyor belt conveys the slurry to the transfer plate, which makes the slurry close to the bottom of the foil, and the lower scraper evenly scrapes the slurry under the foil;

[0009] S3, the slurry is sent to the top of the foil, and the upper scraper evenly scrapes the slurry on the top of the foil;

[0010] S4, the foil passes through a drying box, and the slurry on the foil is dried and solidified;

[0011] S5, cutting the foil, rolling the foil into a roll and feeding it into the battery housing, and injecting electrolyte into the housing;

[0012] S6. Seal the housing and test the battery performance.

[0013] A low-temperature rate type lithium-ion battery preparation system, which is used to implement the low-temperature rate type lithium-ion battery preparation method in the above scheme, comprises a frame, and the frame is provided with:

[0014] Upper scraper;

[0015] A support plate, which is fixedly mounted on the frame and located above the foil;

[0016] The scraper assembly includes a mounting bar fixedly mounted on the frame and located below the support plate, and the mounting bar is provided with:

[0017] Lower scraper;

[0018] A conveyor belt, which is arranged obliquely and is used to convey the slurry;

[0019] The slider is movably mounted on the mounting bar, and a transfer plate is rotatably arranged on the slider, and the transfer plate includes the following two states:

[0020] In the first state, the slider is in a low position, and the transfer plate is tilted and closely attached to the top of the conveyor belt;

[0021] In the second state, the slider moves upward, and the transfer plate changes from the inclined state to the horizontal state and moves upward.

[0022] Preferably, the mounting strip is provided with a plurality of drainage ports, the conveyor belt is provided with a drainage hole, and the drainage ports are directly opposite to the drainage hole to allow the slurry to flow out.

[0023] Preferably, a storage cavity corresponding to the liquid discharge port is formed on the mounting bar, and a push plate is movably provided inside the storage cavity, and the push plate moves to allow the slurry to overflow from the liquid discharge port.

[0024] Preferably, a supporting block corresponding to the drainage hole is provided on the conveyor belt, and an arc-shaped slope is provided on the supporting block for cooperating with the transfer plate.

[0025] Preferably, a plurality of first tenons are movably provided on the transfer plate, and guide plates for guiding the slurry to be evenly distributed on the transfer plate are symmetrically and movably provided on the first tenons.

[0026] Preferably, a stopper corresponding to each of the guide plates and used to limit the inclination angle of the guide plates is provided on the transfer plate, and the first tenon block moves relative to the transfer plate to increase the angle between two adjacent guide plates.

[0027] Preferably, a pull rope is provided between the first tenon block and the mounting strip, and a baffle plate parallel to the first tenon block and used for supporting the guide plate is provided on the transfer plate.

[0028] Preferably, a pressure plate for receiving the slurry is slidably provided on the lower scraper, and the side edges of the pressure plate abut against the bottom surface of the baffle.

[0029] Preferably, the pressure plate is provided with a tenon rod extending to the interior of the lower scraper plate, and the lower scraper plate is provided with an oblique groove adapted to the tenon rod.

[0030] In the above technical scheme, a low-temperature rate lithium-ion battery preparation method and preparation system provided by the present invention have the following beneficial effects: when performing coating work, the foil is first fixed inside the frame, and the supporting roller pushes the foil to move. At this time, the slurry with a higher viscosity is sent to the conveyor belt, and the conveyor belt moves obliquely upward to transport the slurry to a position close to the transfer plate. At this time, the transfer plate is in a first state, the transfer plate is tightly attached to the top of the conveyor belt, and the slurry on the top of the conveyor belt is pushed by the transfer plate and gradually transferred to the transfer plate. Then the slider moves the transfer plate upward, and the transfer plate brings the slurry close to the bottom of the foil, and gradually switches from an inclined state to a horizontal state. The slurry on the transfer plate contacts the foil, and the slurry and the foil There is no gap between the materials, the foil moves with part of the slurry, the lower scraper cooperates with the support plate to push the slurry at the bottom of the foil, so that the slurry is evenly and firmly adhered to the foil, the slider continues to move up with the transfer plate until the distance between the transfer plate and the foil is equal to the thickness of the slurry to be attached to the foil, and the pressing plate moves, the pressing plate cooperates with the support plate to squeeze the slurry and the foil, so that the slurry is firmly fixed on the foil, eliminating the gap between the slurry and the foil, and preventing the slurry at the bottom of the foil from falling during the drying process due to insufficient adhesion, then the slider moves down to restore the transfer plate to the first state, and then the upper scraper applies slurry to the top surface of the foil, the foil passes through the drying box, the drying box dries the slurry on the foil, and the slurry is fixed on the foil. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the internal structure provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the structure of a scraper assembly provided in an embodiment of the present invention;

[0035] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0036] Figure 5 A schematic diagram of an explosion structure provided by an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of the internal structure of a mounting bar provided in an embodiment of the present invention;

[0038] Figure 7for Figure 6 Enlarged view of point B in the middle;

[0039] Figure 8 for Figure 7 Enlarged view of point C in the middle;

[0040] Fig. 9 A schematic structural diagram of a first guide groove provided in an embodiment of the present invention;

[0041] Fig.10 A schematic diagram of the structure of a chute provided in an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1. Scraper assembly; 11. Mounting strip; 111. Conveyor belt; 112. Support block; 113. Drain hole; 114. Storage chamber; 115. Liquid inlet; 116. Drain port; 117. Push plate; 118. Movable plate; 119. Closing plate; 12. Lower scraper; 121. Transfer plate; 122. First tenon; 123. Guide plate; 124. Pull rope; 125. Stopper; 126. Stopper Plate; 127, guide block; 128, first guide groove; 129, second guide groove; 13, driving plate; 131, driving rod; 132, movable plate; 133, second tenon block; 134, movable frame; 135, slider; 136, transmission rod; 137, pressure plate; 138, inclined groove; 139, tenon rod; 2, frame; 21, supporting roller; 22, support plate; 23, upper scraper; 24, drying box. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Embodiment 1

[0045] A method for preparing a low-temperature rate lithium-ion battery comprises the following steps:

[0046] S1. Putting positive and negative electrode materials into a stirrer to form a slurry;

[0047] S2, the conveyor belt 111 conveys the slurry to the transfer plate 121, the transfer plate 121 makes the slurry close to the bottom of the foil, and the lower scraper 12 evenly scrapes the slurry under the foil;

[0048] S3, the slurry is sent to the top of the foil, and the upper scraper 23 evenly scrapes the slurry on the top of the foil;

[0049] S4, the foil passes through the drying box 24, and the slurry on the foil is dried and solidified;

[0050] S5, cutting the foil, rolling the foil into a roll and feeding it into the battery housing, and injecting electrolyte into the housing;

[0051] S6. Seal the housing and test the battery performance. Embodiment 2

[0052] like Figure 1-10 As shown, a low-temperature rate type lithium-ion battery preparation system, which is used to implement the low-temperature rate type lithium-ion battery preparation method in the above scheme, includes a rack 2, and the rack 2 is provided with:

[0053] Upper scraper 23;

[0054] A support plate 22, which is fixedly mounted on the frame 2 and located above the foil;

[0055] The scraper assembly 1 includes a mounting bar 11 fixedly mounted on the frame 2 and located below the support plate 22, and the mounting bar 11 is provided with:

[0056] Lower scraper 12;

[0057] A conveyor belt 111, which is arranged obliquely and is used to convey the slurry;

[0058] The slider 135 is movably mounted on the mounting bar 11. The transfer plate 121 is rotatably arranged on the slider 135. The transfer plate 121 includes the following two states:

[0059] In the first state, the slider 135 is in a low position, and the transfer plate 121 is tilted and closely attached to the top of the conveyor belt 111;

[0060] In the second state, the slider 135 moves upward, and the transfer plate 121 changes from the inclined state to the horizontal state and moves upward.

[0061] Specifically, the frame 2 is provided with a roller for winding up the foil material without slurry attached thereto and a roller for winding up the foil material with slurry attached thereto, the frame 2 is provided with a supporting roller 21 for supporting the foil material, the transfer plate 121 is rotatably mounted on the slider 135, a torsion spring is provided between the transfer plate 121 and the slider 135, a square guide block 127 is provided on the transfer plate 121, a second guide groove 129 adapted to the inclined guide block 127 and a first guide groove 128 adapted to the horizontal guide block 127 are provided on the mounting bar 11, a slope is provided between the first guide groove 128 and the second guide groove 129, a slope is provided on the side of the transfer plate 121 close to the conveyor belt 111, and the conveyor belt 111 includes a portion located on the outer side of the mounting bar 11 obliquely upward and a straight portion located inside the mounting bar 11 (such as Figure 4 and 5 As shown in FIG. 1 ), a drying box 24 for drying the slurry is provided inside the frame 2.

[0062] Furthermore, during the coating operation, one roller releases the foil, and the other roller reels the foil. The foil moves inside the frame 2, and the supporting roller 21 limits the foil so that the foil is tightly attached to the bottom surface of the supporting plate 22. At this time, the slurry with a higher viscosity is sent to the conveyor belt 111, and the slurry moves along the oblique upward part of the conveyor belt 111 to a position close to the transfer plate 121. At this time, the transfer plate 121 is in the first state, and the transfer plate 121 is tightly attached to the top of the conveyor belt 111. The slurry on the top of the conveyor belt 111 is pushed by the transfer plate 121 and gradually transferred to the transfer plate 121. Then the slider 135 moves the transfer plate 121 upward, and the transfer plate 121 approaches the bottom of the foil with the slurry. The guide block 127 on the transfer plate 121 moves along the slope between the second guide groove 129 and the first guide groove 128, and the slope pushes the guide block 127 to make the transfer plate 121 relative to the slider 135 rotates and gradually switches from an inclined state to a horizontal state, the torsion spring accumulates elastic potential energy, the guide block 127 is engaged with the first guide groove 128, the slider 135 continues to move upward, the slurry on the transfer plate 121 contacts the foil, and the foil moves with part of the slurry. The lower scraper 12 cooperates with the support plate 22 to push the slurry at the bottom of the foil, so that the slurry is evenly and firmly adhered to the foil, and the slider 135 continues to move upward with the transfer plate 121 until the distance between the transfer plate 121 and the foil is equal to the thickness of the slurry to be attached to the foil. Then the slider 135 moves downward, the guide block 127 returns from the first guide groove 128 to the second guide groove 129, the torsion spring releases elastic potential energy, and the transfer plate 121 returns to the first state. Then the upper scraper 23 applies slurry to the top surface of the foil, and the foil passes through the drying box 24, and the drying box 24 dries the slurry on the foil, and the slurry is fixed on the foil.

[0063] In the above technical solution, when coating, the foil is first fixed inside the frame 2, and the supporting roller 21 pushes the foil to move. At this time, the slurry with a higher viscosity is sent to the conveyor belt 111, and the conveyor belt 111 moves obliquely upward to transport the slurry to a position close to the transfer plate 121. At this time, the transfer plate 121 is in the first state, and the transfer plate 121 is close to the top of the conveyor belt 111. The slurry on the top of the conveyor belt 111 is pushed by the transfer plate 121 and gradually transferred to the transfer plate 121. Then the slider 135 moves up with the transfer plate 121, and the transfer plate 121 brings the slurry to the bottom of the foil and gradually The inclined state is switched to the horizontal state, the slurry on the transfer plate 121 contacts the foil, and the foil moves with part of the slurry. The lower scraper 12 cooperates with the support plate 22 to push the slurry at the bottom of the foil, so that the slurry is evenly and firmly adhered to the foil. The slider 135 continues to move upward with the transfer plate 121 until the distance between the transfer plate 121 and the foil is equal to the thickness of the slurry to be attached to the foil. Then the slider 135 moves downward to restore the transfer plate 121 to the first state. Then the upper scraper 23 applies slurry to the top surface of the foil. The foil passes through the drying box 24, and the drying box 24 dries the slurry on the foil, and the slurry is fixed on the foil.

[0064] As a further embodiment of the present invention, a plurality of drainage ports 116 are provided on the mounting bar 11 , a drainage hole 113 is provided on the conveyor belt 111 , and the drainage ports 116 are directly opposite to the drainage hole 113 to allow the slurry to flow out.

[0065] Specifically, the drainage ports 116 are distributed in a linear array, the conveyor belt 111 is provided with drainage holes 113 distributed in a rectangular array, and the mounting bar 11 is provided with a driving rod 131 for driving the conveyor belt 111 to move.

[0066] Furthermore, during operation, the driving rod 131 drives the conveyor belt 111 to move. When a row of drainage holes 113 on the conveyor belt 111 is opposite to a row of drainage ports 116 on the mounting strip 11, the slurry in the drainage ports 116 overflows from the drainage holes 113 onto the conveyor belt 111. The conveyor belt 111 drives the slurry to move obliquely upward, and the slurry gradually approaches the transfer plate 121.

[0067] As another embodiment further provided by the present invention, a receiving cavity 114 corresponding to the drain port 116 is provided on the mounting bar 11 , and a push plate 117 is movably provided inside the receiving cavity 114 , and the push plate 117 moves to allow the slurry to overflow from the drain port 116 .

[0068] Specifically, the mounting bar 11 is provided with a liquid inlet 115 which is connected to a plurality of storage chambers 114 and for the flow of slurry. The mounting bar 11 is internally provided with a transmission rod 136 for connecting a plurality of push plates 117 in series. A downwardly inclined arc slope is provided on the side of the push plate 117 close to the liquid inlet 115. A sealing plate 119 is provided between the push plate 117 and the mounting bar 11. The sealing plate 119 is specifically a telescopic plate. A notch is provided on the push plate 117, and a movable plate 118 is symmetrically hinged on the notch. A spring is provided between the movable plate 118 and the push plate 117.

[0069] Furthermore, during operation, the slurry enters the receiving chamber 114 through the liquid inlet 115, and moves to the top of the push plate 117 under the guidance of the downward arc slope of the push plate 117. Then, the transmission rod 136 moves the push plate 117 upward, and the push plate 117 pushes the slurry to the discharge port 116, and moves from the discharge hole 113 to the conveyor belt 111. At this time, the movable plate 118 seals the gap on the push plate 117, and then the transmission rod 136 moves the push plate 117 downward, and the push plate 117 The downwardly inclined arc slope can preferentially pass through the channel between the storage chamber 114 and the liquid inlet channel 115 and temporarily close the channel. The slurry under the push plate 117 is pressurized to push the movable plate 118 to rotate, and the notch on the push plate 117 opens. The slurry moves through the notch to the top of the push plate 117 until the push plate 117 moves to the lowest point. The channel between the storage chamber 114 and the liquid inlet channel 115 is opened, and the movable plate 118 re-seals the notch on the push plate 117 under the action of the torsion spring.

[0070] As another embodiment further provided by the present invention, a supporting block 112 corresponding to the drainage hole 113 is provided on the conveyor belt 111 , and an arc-shaped slope is provided on the supporting block 112 for matching with the transfer plate 121 .

[0071] Specifically, after the slurry passes through the drainage hole 113 and moves to the top of the conveyor belt 111 of the frame 2, it will flow downward along the conveyor belt 111, and the arc slope on the supporting block 112 can block the slurry and play a role in accumulating the slurry. The conveyor belt 111 moves upward with the supporting block 112 and the slurry, the drainage hole 113 is staggered with the drainage port 116, and the drainage hole 113 is sealed. At this time, the transfer plate 121 contacts the slurry, and the slurry is transferred to the transfer plate 121, and the side of the transfer plate 121 can move along the arc slope of the supporting block 112 to scrape away as much slurry on the conveyor belt 111 as possible. At the same time, the supporting block 112 pushes the transfer plate 121 to rotate, so that the transfer plate 121 rotates in a horizontal direction to prevent the slurry on the transfer plate 121 from flowing downward, and also helps the transfer plate 121 switch from the first state to the second state.

[0072] As another embodiment further provided by the present invention, a plurality of first tenons 122 are movably provided on the transfer plate 121 , and guide plates 123 for guiding the slurry to be evenly distributed on the transfer plate 121 are symmetrically and movably provided on the first tenons 122 .

[0073] Specifically, a torsion spring is arranged between the two transfer plates 121, the first tenon block 122 is specifically cylindrical, a cylindrical rod for matching the guide plate 123 is arranged on the top of the first tenon block 122, the tips formed by the two guide plates 123 are facing the drainage hole 113 on the conveyor belt 111, and a tenon groove adapted to the first tenon block 122 is opened on the transfer plate 121.

[0074] Furthermore, during the movement of the conveyor belt 111, the slurry on the conveyor belt 111 is gradually transferred to the transfer plate 121, and the slurry gradually contacts the tips of the two guide plates 123. The tips of the two guide plates 123 divide the slurry into two relatively even parts. The slurry moves along the guide plates 123 and is then relatively evenly distributed on the transfer plate 121.

[0075] As another embodiment further provided by the present invention, a stopper 125 corresponding to the guide plate 123 and used to limit the inclination angle of the guide plate 123 is provided on the transfer plate 121, and the first tenon block 122 moves relative to the transfer plate 121 to increase the angle between two adjacent guide plates 123.

[0076] Specifically, the guide plate 123 is tightly attached to the stopper 125 under the action of the torsion spring. When the first tenon 122 moves relative to the transfer plate 121, the first tenon 122 approaches the straight line formed by the multiple stoppers 125, and the angle between the two adjacent guide plates 123 increases. The space on the transfer plate 121 for the slurry to occupy is larger, so that the slurry is more evenly distributed on the transfer plate 121, and at the same time, it can also prevent too much slurry from crossing the guide plate 123. The first tenon 122 continues to move until the two guide plates 123 are parallel and the two guide plates 123 no longer move relative to each other. At this time, the material distribution work on the transfer plate 121 is completed.

[0077] As another embodiment further provided by the present invention, a pull rope 124 is provided between the first tenon block 122 and the mounting bar 11 , and a baffle 126 is provided on the transfer plate 121 parallel to the transfer plate 121 and used to support the guide plate 123 .

[0078] Specifically, a spring is arranged between the first tenon block 122 and the transfer plate 121 , the first end of the pull rope 124 is fixed to the mounting bar 11 , and the second end is fixed to the cylindrical rod on the first tenon block 122 ; a slope is arranged on the first end of the transfer plate 121 near the baffle 126 .

[0079] Furthermore, in the process of the slider 135 moving the transfer plate 121 upward, the pull rope 124 pulls the first tenon block 122 to move along the tenon groove on the transfer plate 121, and the spring between the first tenon block 122 and the transfer plate 121 is stretched until the first tenon block 122 moves to the end of the tenon groove, and the transfer plate 121 continues to move upward, and the pull rope 124 pulls the cylindrical rod, and the cylindrical rod drives the first tenon block 122 and the guide plate 123 to rotate, so that the guide plate 123 is tightly attached to the baffle 126, and the top surface of the guide plate 123 is flush with the top surface of the transfer plate 121, so as to prevent the guide plate 123 from affecting the contact between the slurry and the foil on the transfer plate 121.

[0080] As another embodiment further provided by the present invention, a pressing plate 137 for receiving the slurry is slidably provided on the lower scraper 12 , and a side edge of the pressing plate 137 abuts against the bottom surface of the baffle 126 .

[0081] Specifically, a spring is provided between the pressing plate 137 and the mounting bar 11 .

[0082] Furthermore, during the upward movement of the transfer plate 121, the pressure plate 137 also moves upward under the action of the spring, and can receive the slurry that is carried away by the foil but does not stably adhere to the foil and falls, as well as the slurry scraped off by the lower scraper 12. This part of the slurry accumulates on the push plate 117, and more and more slurry will gradually come into contact with the foil, so that this part of the slurry can be reused.

[0083] As another embodiment further provided by the present invention, a tenon rod 139 extending to the interior of the lower scraper plate 12 is provided on the pressure plate 137 , and an inclined groove 138 adapted to the tenon rod 139 is provided on the lower scraper plate 12 .

[0084] Specifically, the tenon rod 139 is cylindrical and is distributed in a linear array on the pressure plate 137. A driving disk 13 that rotates along with the roller of the rolled foil is rotatably provided on the mounting bar 11 (this is the prior art and will not be described in detail). A movable disk 132 is provided on the driving disk 13. A transmission chain is provided between the movable disk 132 and the driving rod 131. A movable frame 134 is slidably provided on the mounting bar 11. A second tenon block 133 extending to the inside of the movable frame 134 is provided on the movable disk 132. A transmission rod 136 extends to the inside of the movable frame 134. A slider 135 is fixedly installed on the transmission rod 136.

[0085] Furthermore, during the coating operation, one roller releases the foil, and the other roller reels the foil. The foil moves inside the frame 2, and the supporting roller 21 restricts the foil so that the foil is tightly attached to the bottom surface of the supporting plate 22. At this time, the slurry with a higher viscosity is sent to the storage chamber 114 through the liquid inlet 115, and moves to the top of the push plate 117 under the guidance of the downward arc slope of the push plate 117. The roller drives the driving disk 13 to rotate, and the driving disk 13 drives the second tenon block 133 to make a circular motion through the movable disk 132. The second tenon block 133 reciprocates horizontally inside the movable frame 134 and pushes the movable frame 134 to move upward. The movable frame 134 is driven by the transmission The rod 136 drives the push plate 117 to move upward, and the driving disc 13 drives the driving rod 131 to rotate through the transmission chain. The driving rod 131 drives the conveyor belt 111 to move, and the push plate 117 pushes the slurry to move to the discharge port 116. At this time, the discharge port 116 is opposite to the discharge hole 113 on the conveyor belt 111. The slurry moves from the discharge hole 113 to the conveyor belt 111. During this process, the movable plate 118 seals the gap on the push plate 117. After the slurry passes through the discharge hole 113 and moves to the top of the conveyor belt 111 of the frame 2, it will flow downward along the conveyor belt 111, and the arc slope on the supporting block 112 can block the slurry, thereby accumulating the slurry.

[0086] The driving disc 13 continues to rotate, and the push plate 117 and the slider 135 are driven downward by the transmission rod 136. The downward arc slope of the push plate 117 can preferentially pass through the channel between the receiving chamber 114 and the liquid inlet 115, and the channel is temporarily closed. The slurry under the push plate 117 is pressed to push the movable plate 118 to rotate, and the notch on the push plate 117 is opened. The slurry moves to the top of the push plate 117 through the notch until the push plate 117 moves to the lowest point. The channel between the receiving chamber 114 and the liquid inlet 115 is opened, and the movable plate 118 seals the notch on the push plate 117 again under the action of the torsion spring, and the slider 135 moves downward with the transfer plate 121. The guide block 127 on the transfer plate 121 returns from the first guide groove 128 to the second guide groove 129. The torsion spring releases its elastic potential energy, so that the transfer plate 121 returns to the first state, and the transfer plate 121 is close to the top of the conveyor belt 111. At the same time, the drive The movable rod 131 drives the conveyor belt 111 to move, and the conveyor belt 111 moves upward with the supporting block 112 and the slurry, the drainage hole 113 is staggered with the drainage port 116, and the drainage hole 113 is sealed. At this time, the transfer plate 121 contacts the slurry, and the slurry is transferred to the transfer plate 121, and the side of the transfer plate 121 can move along the arc slope of the supporting block 112 to scrape away the slurry on the conveyor belt 111 as much as possible. At the same time, the supporting block 112 pushes the transfer plate 121 to rotate, so that the transfer plate 121 rotates in a horizontal direction to prevent the slurry on the transfer plate 121 from flowing downward, and at the same time, it can also help the transfer plate 121 switch from the first state to the second state. The slurry moves on the transfer plate 121 and gradually contacts the tips of the two guide plates 123. The tips of the two guide plates 123 divide the slurry into two relatively even parts. The slurry moves along the guide plate 123 and is then distributed relatively evenly on the transfer plate 121.

[0087] Then the slider 135 moves up with the transfer plate 121, and the transfer plate 121 moves toward the bottom of the foil with the slurry, and the guide block 127 on the transfer plate 121 moves along the slope between the second guide groove 129 and the first guide groove 128. The slope pushes the guide block 127, so that the transfer plate 121 rotates relative to the slider 135, and gradually switches from an inclined state to a horizontal state. The torsion spring accumulates elastic potential energy, and the guide block 127 is engaged with the first guide groove 128. The pull rope 124 pulls the first tenon block 122 to move along the tenon groove on the transfer plate 121. The spring between the first tenon block 122 and the transfer plate 121 is stretched, and the first tenon block 122 approaches the straight line formed by multiple stoppers 125, and the angle between two adjacent guide plates 123 increases. The transfer plate 121 has a larger space for the slurry to occupy, so that the slurry is more evenly distributed on the transfer plate 121, and at the same time, too much slurry can be prevented from crossing the guide plate 123. The first tenon block 122 continues to move until the two guide plates 123 are parallel and the two guide plates 123 no longer move relative to each other. At this time, the material distribution work on the transfer plate 121 is completed until the first tenon block 122 moves to the end of the tenon groove, and the transfer plate 121 continues to move upward. The pull rope 124 pulls the cylindrical rod, and the cylindrical rod drives the first tenon block 122 and the guide plate 123 to rotate, so that the guide plate 123 is tightly attached to the baffle 126, and the top surface of the guide plate 123 is flush with the top surface of the transfer plate 121, so as to prevent the guide plate 123 from affecting the contact between the slurry and the foil on the transfer plate 121.

[0088] The slurry on the transfer plate 121 contacts the foil, and the foil moves with part of the slurry. The lower scraper 12 cooperates with the support plate 22 to push the slurry at the bottom of the foil, so that the slurry is evenly and firmly adhered to the foil. The slider 135 continues to move upward with the transfer plate 121 until the distance between the transfer plate 121 and the foil is equal to the thickness of the slurry that needs to be attached to the foil. In the process of the transfer plate 121 moving upward, the pressing plate 137 also moves upward under the action of the spring, which can receive the slurry that is taken away by the foil but does not stably adhere to the foil and falls, as well as the slurry scraped off by the lower scraper 12. This part of the slurry accumulates on the push plate 117, and more and more slurry will gradually contact the foil, so that this part of the slurry can be reused.

[0089] At the same time, during the reciprocating movement of the pressing plate 137 in the vertical direction, the pressing plate 137 cooperates with the supporting plate 22 to squeeze the slurry and the foil, so that the slurry is firmly fixed on the foil, and the slurry at the bottom of the foil is prevented from falling during the drying process due to insufficient adhesion. The tenon rod 139 on the pressing plate 137 moves along the inclined groove 138 on the lower scraper 12, and the tenon rod 139 cooperates with the inclined groove 138 to guide the movement of the pressing plate 137, so that the foil part facing the pressing plate 137 at a low position is different from the foil part facing the pressing plate 137 at a high position, and the slurry dropped from the foil part with more slurry can be collected and used in the foil part with less slurry, so that the slurry is further evenly distributed on the foil, and then the slurry is added to the upper surface of the foil, and the upper scraper 23 evenly scrapes the slurry on the upper surface of the foil. At this time, the slurry is attached to the upper and lower surfaces of the foil, and then the foil passes through the drying box 24, and the drying box 24 dries the slurry on the foil, and the slurry is fixed on the foil.

[0090] Furthermore, the scraper assembly 1 and the upper scraper plate 23 in the above embodiment can be multiple, and the slurry is scraped and coated on the foil through multiple scraper assemblies 1 and upper scraper plates 23. In the above embodiment, a hot air blower can be added after the scraper assembly 1 to pre-dry the slurry on the lower surface of the foil by hot air, so that the slurry is solidified on the lower surface of the foil.

[0091] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-temperature rate lithium-ion battery preparation system, characterized in that: The invention comprises a frame (2), on which is arranged: Upper scraper (23); A support plate (22) fixedly mounted on the frame (2) and located above the foil; The scraper assembly (1) comprises a mounting bar (11) fixedly mounted on a frame (2) and located below the support plate (22), wherein the mounting bar (11) is provided with: Lower scraper (12); A conveyor belt (111), which is arranged obliquely and is used to convey slurry; A slider (135) is movably mounted on the mounting bar (11), and a transfer plate (121) is rotatably arranged on the slider (135). The transfer plate (121) includes the following two states: In a first state, the slider (135) is in a low position, and the transfer plate (121) is tilted and closely attached to the top of the conveyor belt (111); In the second state, the slider (135) moves upward, and the transfer plate (121) changes from an inclined state to a horizontal state and moves upward; It also comprises a baffle (126), a pressing plate (137) for receiving slurry being slidably arranged on the lower scraper (12), and a side edge of the pressing plate (137) abuts against the bottom surface of the baffle (126); The pressing plate (137) is provided with a tenon rod (139) extending into the interior of the lower scraper plate (12), and the lower scraper plate (12) is provided with an inclined groove (138) adapted to the tenon rod (139).

2. A low-temperature rate lithium-ion battery preparation system according to claim 1, characterized in that: The mounting strip (11) is provided with a plurality of drainage ports (116), the conveyor belt (111) is provided with a drainage hole (113), and the drainage ports (116) are directly opposite to the drainage hole (113) to allow the slurry to flow out.

3. A low-temperature rate lithium-ion battery preparation system according to claim 2, characterized in that: The mounting strip (11) is provided with a storage cavity (114) corresponding to the liquid discharge port (116), and a push plate (117) is movably provided inside the storage cavity (114), and the push plate (117) moves to allow the slurry to overflow from the liquid discharge port (116).

4. A low-temperature rate lithium-ion battery preparation system according to claim 2, characterized in that: The conveyor belt (111) is provided with a supporting block (112) corresponding to the drainage hole (113), and the supporting block (112) is provided with an arc-shaped slope for cooperating with the transfer plate (121).

5. A low-temperature rate lithium-ion battery preparation system according to claim 1, characterized in that: A plurality of first tenons (122) are movably arranged on the transfer plate (121), and guide plates (123) for guiding the slurry to be evenly distributed on the transfer plate (121) are symmetrically movably arranged on the first tenons (122).

6. A low-temperature rate lithium-ion battery preparation system according to claim 5, characterized in that: The transfer plate (121) is provided with a stopper (125) corresponding one-to-one to the guide plate (123) and used to limit the inclination angle of the guide plate (123); the first tenon block (122) moves relative to the transfer plate (121) to increase the angle between two adjacent guide plates (123).

7. A low-temperature rate lithium-ion battery preparation system according to claim 6, characterized in that: A pull rope (124) is provided between the first tenon block (122) and the mounting strip (11), and a baffle (126) is provided on the transfer plate (121) and is parallel to the transfer plate (121) and is used to support the guide plate (123).

8. A method for preparing a low-temperature rate lithium-ion battery, based on the low-temperature rate lithium-ion battery preparation system according to any one of claims 1 to 7, characterized in that: The following steps are also included: S1. Putting positive and negative electrode materials into a stirrer to form a slurry; S2, the conveyor belt (111) conveys the slurry to the transfer plate (121), the transfer plate (121) makes the slurry close to the bottom of the foil, and the lower scraper (12) scrapes the slurry evenly under the foil; S3, the slurry is sent to the top of the foil, and the upper scraper (23) scrapes the slurry evenly on the top of the foil; S4, the foil passes through a drying box (24), and the slurry on the foil is dried and solidified; S5, cutting the foil, rolling the foil into a roll and feeding it into the battery housing, and injecting electrolyte into the housing; S6. Seal the housing and test the battery performance.

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