Battery coating device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a battery coating device which comprises a buffer tank, a coating die head and at least two conveying units, each conveying unit comprises a first screw pump, a second screw pump and a magnet filter, the first screw pump is connected with the buffer tank, and the second screw pump is connected with the magnet filter. The first screw pump is connected with the coating die head, the second screw pump is connected with the coating die head, the magnet filter is arranged between the first screw pump and the second screw pump, and the magnet filter is connected with the first screw pump and the second screw pump; when the slurry is conveyed from the first screw pump to the second screw pump, magnetic substances can be removed through the magnet filter, and the quality of a battery cell is improved, so that the influence on the self-discharge performance of a subsequent battery is avoided. Through the arrangement of the at least two conveying units, the at least two conveying units can be flexibly switched, so that the first screw pump, the second screw pump and the magnet filter are conveniently cleaned, and the production efficiency of the coating process is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production, and in particular relates to a battery coating device. Background Art

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] In the existing secondary battery (such as lithium-ion batteries, sodium-ion batteries, etc.) technical processing, homogenization and coating are the two core processes. The slurry used in secondary batteries generally includes active materials, conductive agents, binders and solvents. However, in the slurry processing and raw materials, it is often inevitable to contain a certain amount of impurities, especially magnetic substances such as iron, nickel, zinc, manganese, etc. These magnetic substances have a significant impact on the self-discharge performance (K value) of the finished battery. Utility Model Content

[0004] The purpose of the utility model is to provide a battery coating device to address the deficiencies of the prior art, thereby solving the problem that in the prior art, a certain amount of impurities, especially magnetic substances, are often inevitably contained in the slurry processing process and raw materials, and these magnetic substances usually directly affect the self-discharge and other performance of the battery.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery coating device comprises a buffer tank, a coating die and at least two conveying units, each of the conveying units comprises a first screw pump, a second screw pump and a magnet filter, the first screw pump is connected to the buffer tank, the second screw pump is connected to the coating die, the magnet filter is arranged between the first screw pump and the second screw pump, and the magnet filter is connected to the first screw pump and the second screw pump.

[0007] Preferably, the magnet filter includes a magnetic rod and a cover body, the cover body is arranged on the top of the magnetic rod, the magnetic rod has a accommodating cavity, a threaded structure is arranged on the cavity wall of the accommodating cavity, the magnetic rod is provided with a slurry inlet and a slurry outlet connected to the accommodating cavity, the magnetic rod is connected to the first screw pump through the slurry inlet, and the magnetic rod is connected to the second screw pump through the slurry outlet.

[0008] Preferably, the height H of the accommodating cavity and the lead P of the thread structure satisfy the relationship: H:P=(5-9):1.

[0009] Preferably, the first screw pump and the second screw pump each include a base, a driving member, a material delivery pipe body and a material delivery shaft, the driving member and the material delivery pipe body are both arranged on the base, the material delivery shaft is arranged in the material delivery pipe body, the output shaft of the driving member passes through one end of the material delivery pipe body and is connected to the material delivery shaft, the material delivery pipe body is provided with a feed port and a discharge port, and the discharge port is located at the other end of the material delivery pipe body;

[0010] Among them, the feed port of the feed pipe body of the first screw pump is connected to the buffer tank, the discharge port of the feed pipe body of the first screw pump is connected to the feed port of the feed pipe body of the second screw pump through the magnetic filter, and the discharge port of the feed pipe body of the second screw pump is connected to the coating die head.

[0011] Preferably, the conveying pipe body includes a feed piece, a discharge piece and a connecting piece, the feed piece, the connecting piece and the discharge piece are connected in sequence, the feed port is arranged on the feed piece, the discharge port is arranged on the discharge piece, one end of the feed shaft is arranged in the discharge piece, the other end of the feed shaft is arranged in the connecting piece, and the output shaft of the driving member passes through one end of the feed piece and is connected to the feed shaft.

[0012] Preferably, the feed shaft includes a screw shaft, a connecting shaft, a first universal joint shaft and a second universal joint shaft, the screw shaft is arranged in the connecting member, the connecting shaft is arranged in the feeding member, one end of the connecting shaft is connected to the output shaft of the driving member through the first universal joint shaft, and the other end of the connecting shaft is connected to the screw shaft through the second universal joint shaft.

[0013] Preferably, the inner diameter of the discharge member gradually decreases from the connecting member toward the discharge port.

[0014] Preferably, each of the conveying units further includes a first valve, and the first screw pump is connected to the buffer tank via the first valve.

[0015] Preferably, the battery coating device further comprises a second valve and a filter, the second screw pump is connected to the filter, and the filter is connected to the coating die through the second valve.

[0016] Preferably, the battery coating device further comprises a reflux pipe, and the reflux pipe connects the coating die head and the buffer tank.

[0017] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0018] The battery coating device of the embodiment of the utility model is used in conjunction with a buffer tank, a coating die head and a conveying unit. The conveying unit includes a first screw pump, a second screw pump and a magnetic filter. The magnetic filter is arranged between the first screw pump and the second screw pump, and is respectively connected to the first screw pump and the second screw pump, so that when the slurry is conveyed from the first screw pump to the second screw pump, the magnetic material can be removed by the magnetic filter to improve the quality of the battery cell, thereby avoiding affecting the self-discharge performance of the subsequent battery. By setting at least two conveying units, at least two conveying units can be flexibly switched to clean the first screw pump, the second screw pump and the magnetic filter, further improving the production efficiency of the coating process.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of the battery coating device of the utility model.

[0022] Figure 2 This is a schematic structural diagram of the first screw pump of the utility model.

[0023] Figure 3 It is a structural schematic diagram of the second screw pump of the utility model.

[0024] Figure 4 It is a structural schematic diagram of the magnetic filter of the utility model.

[0025] The reference numerals are described as follows:

[0026] 100. Battery coating device;

[0027] 10. Cache tank;

[0028] 20. Coating die head;

[0029] 30. Conveying unit; 31. First screw pump; 311. Base; 312. Driving member; 313. Conveying pipe body; 3131. Feeding member; 3132. Discharging member; 3133. Connecting member; 3134. Feeding port; 3135. Discharging port; 314. Conveying shaft; 3141. Screw shaft; 3142. Connecting shaft; 3143. First universal joint shaft; 3144. Second universal joint shaft; 315. Bearing seat; 316. Transmission shaft; 317. Bearing; 318. Coupling; 32. Second screw pump; 33. Magnetic filter; 331. Magnetic rod; 332. Cover body; 333. Accommodating chamber; 334. Threaded structure; 335. Slurry inlet; 336. Slurry outlet; 34. First valve;

[0030] 40. Reflux pipe;

[0031] 50. Second valve;

[0032] 60. Filter. DETAILED DESCRIPTION

[0033] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0034] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0035] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0036] The following will be combined with the attached Figures 1 to 4The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] See also Figure 1 The battery coating device 100 of an embodiment of the utility model includes a buffer tank 10, a coating die 20 and at least two conveying units 30, each of the conveying units 30 includes a first screw pump 31, a second screw pump 32 and a magnet filter 33, the first screw pump 31 is connected to the buffer tank 10, the second screw pump 32 is connected to the coating die 20, the magnet filter 33 is arranged between the first screw pump 31 and the second screw pump 32, and the magnet filter 33 is connected to the first screw pump 31 and the second screw pump 32.

[0038] Compared with the prior art, the battery coating device 100 of the utility model embodiment uses a buffer tank 10, a coating die head 20 and a conveying unit 30. The conveying unit 30 includes a first screw pump 31, a second screw pump 32 and a magnetic filter 33. The magnetic filter 33 is arranged between the first screw pump 31 and the second screw pump 32, and is respectively connected to the first screw pump 31 and the second screw pump 32, so that when the slurry is conveyed from the first screw pump 31 to the second screw pump 32, the magnetic material can be removed by the magnetic filter 33 to improve the quality of the battery cell, thereby avoiding affecting the self-discharge performance of the subsequent battery. By setting at least two conveying units 30, at least two conveying units 30 can be flexibly switched to clean the first screw pump 31, the second screw pump 32 and the magnetic filter 33, further improving the production efficiency of the coating process.

[0039] See also Figure 1 , Figure 4In some embodiments, the magnetic filter 33 includes a magnetic rod 331 and a cover 332, wherein the cover 332 is disposed on the top of the magnetic rod 331, the magnetic rod 331 has a receiving cavity 333, a threaded structure 334 is disposed on the cavity wall of the receiving cavity 333, and a slurry inlet 335 and a slurry outlet 336 are disposed on the magnetic rod 331, which are connected to the receiving cavity 333. The magnetic rod 331 is connected to the first screw pump 31 through the slurry inlet 335, and the magnetic rod 331 is connected to the second screw pump 32 through the slurry outlet 336. Through the coordinated use of the magnetic rod 331 and the cover 332, the cover 332 is disposed on the top of the magnetic rod 331, and the magnetic rod 331 is effectively sealed and installed. A threaded structure 334 is disposed in the receiving cavity 333 of the magnetic rod 331 to ensure the demagnetization effect of the magnetic rod 331. A slurry inlet 335 and a slurry outlet 336 are provided on the magnetic rod 331. The first screw pump 31 is connected to the slurry inlet 335, so that the first screw pump 31 can transport the slurry to the accommodating chamber 333 of the magnetic filter 33 through the slurry inlet 335. The second screw pump 32 is connected to the slurry outlet 336, so that the slurry in the accommodating chamber 333 can be transported to the second screw pump 32 through the slurry outlet 336, effectively ensuring that the slurry can be transported from the first screw pump 31 to the second screw pump 32.

[0040] In some embodiments, the height H of the accommodating cavity 333 and the lead P of the thread structure 334 satisfy the relationship: H:P=(5-9):1. By setting the height H of the accommodating cavity 333 and the lead P of the thread structure 334, H:P=(5-9):1, the magnetic bar 331 can further absorb the magnetic material in the slurry, thereby improving the demagnetization effect of the magnetic bar 331.

[0041] Specifically, H:P=5:1, H:P=6:1, H:P=7:1, H:P=8:1 or H:P=9:1.

[0042] It can be understood that the lead is the axial distance that any point on the thread moves along the same helical line during one rotation.

[0043] See also Figures 1 to 3 In some embodiments, the first screw pump 31 and the second screw pump 32 have the same structure.

[0044] Furthermore, the first screw pump 31 and the second screw pump 32 each include a base 311, a driving member 312, a delivery tube 313 and a delivery shaft 314. The driving member 312 and the delivery tube 313 are both arranged on the base 311. The delivery shaft 314 is arranged in the delivery tube 313. The output shaft of the driving member 312 passes through one end of the delivery tube 313 and is connected to the delivery shaft 314. The delivery tube 313 is provided with a feed inlet 3134 and a discharge outlet 314. 3135, the discharge port 3135 is located at the other end of the delivery tube body 313; wherein, the feed port 3134 of the delivery tube body 313 of the first screw pump 31 is connected to the buffer tank 10, the discharge port 3135 of the delivery tube body 313 of the first screw pump 31 is connected to the feed port 3134 of the delivery tube body 313 of the second screw pump 32 through the magnetic filter 33, and the discharge port 3135 of the delivery tube body 313 of the second screw pump 32 is connected to the coating die head 20.

[0045] Through the coordinated use of the base 311, the driving member 312, the feed pipe body 313 and the feed shaft 314, the feed pipe body 313 is provided with a feed inlet 3134 and a feed outlet 3135. In the first screw pump 31, the feed inlet 3134 of the feed pipe body 313 is connected to the buffer tank 10, and the feed outlet 3135 of the feed pipe body 313 is connected to the slurry inlet 335 of the magnet filter 33, so that the slurry in the buffer tank 10 can be transported to the magnet filter 33 through the first screw pump 31. In the second screw pump 32, the feed inlet 3134 of the feed pipe body 313 is connected to the magnet filter 33, and the feed outlet 3135 of the feed pipe body 313 is connected to the coating die 20, so that the slurry can be transported from the magnet filter 33 to the coating die 20 through the second screw pump 32. The transportation of the slurry is effectively guaranteed, thereby ensuring the stability of the slurry transportation.

[0046] Furthermore, the delivery pipe body 313 includes a feed piece 3131, a discharge piece 3132 and a connecting piece 3133, the feed piece 3131, the connecting piece 3133 and the discharge piece 3132 are connected in sequence, the feed port 3134 is arranged on the feed piece 3131, the discharge port 3135 is arranged on the discharge piece 3132, one end of the delivery shaft 314 is arranged in the discharge piece 3132, the other end of the delivery shaft 314 is arranged in the connecting piece 3133, and the output shaft of the driving member 312 passes through one end of the feed piece 3131 and is connected to the delivery shaft 314. Through the coordinated use of the feed piece 3131, the discharge piece 3132 and the connecting piece 3133, the feed port 3134 is set on the feed piece 3131, the discharge port 3135 is set on the discharge piece 3132, the feed piece 3131, the connecting piece 3133 and the discharge piece 3132 are connected in sequence. During use, the slurry enters the feed piece 3131 from the feed port 3134, is then transported to the discharge piece 3132 through the connecting piece 3133, and is output through the discharge port 3135, which effectively ensures the transportation of the slurry, thereby ensuring the stability of the slurry transportation.

[0047] Furthermore, the feed shaft 314 includes a screw shaft 3141, a connecting shaft 3142, a first universal joint shaft 3143 and a second universal joint shaft 3144, the screw shaft 3141 is arranged in the connecting member 3133, the connecting shaft 3142 is arranged in the feeding member 3131, one end of the connecting shaft 3142 is connected to the output shaft of the driving member 312 through the first universal joint shaft 3143, and the other end of the connecting shaft 3142 is connected to the screw shaft 3141 through the second universal joint shaft 3144. By using the screw shaft 3141, the connecting shaft 3142, the first universal joint shaft 3143 and the second universal joint shaft 3144 in coordination, the first universal joint shaft 3143 is used to connect the connecting shaft 3142 and the output shaft of the driving member 312, and the second universal joint shaft 3144 is used to connect the connecting shaft 3142 and the screw shaft 3141, the transmission mode of the feed shaft 314 is effectively made more flexible, so that the feed shaft 314 can adapt to more angles and position changes during installation or use, without having to worry about poor transmission or damage due to angle problems.

[0048] See also Figures 2-3 In some embodiments, the inner diameter of the discharge member 3132 gradually decreases from the connecting member 3133 toward the discharge port 3135. As the inner diameter of the discharge member 3132 gradually decreases, the pressure on the slurry during the conveying process gradually increases, thereby pushing the material to flow to the discharge port 3135 faster. This helps to reduce the retention time of the slurry in the conveying pipe body 313 and improve the material conveying efficiency.

[0049] See also Figures 2-3In some embodiments, the first screw pump 31 and the second screw pump 32 also include a bearing seat 315, a transmission shaft 316, a bearing 317 and a coupling 318. The bearing seat 315 is arranged on the base 311 and connected to one end of the feed member 3131. The bearing 317 is arranged on the bearing seat 315. One end of the transmission shaft 316 passes through the bearing 317 and is connected to the first universal joint shaft 3143. The other end of the transmission shaft 316 is connected to the output shaft of the driving member 312 through the coupling 318.

[0050] Specifically, the driving member 312 is a motor.

[0051] See also Figure 1 In some embodiments, each of the conveying units 30 further includes a first valve 34, and the first screw pump 31 is connected to the buffer tank 10 through the first valve 34. Through the setting of the first valve 34, the first valve 34 is used to connect the first screw pump 31 and the buffer tank 10, and effectively control the conveying of the slurry in the buffer tank 10 to the first screw pump 31.

[0052] See also Figure 1 In some embodiments, the battery coating device 100 further includes a second valve 50 and a filter 60, the second screw pump 32 is connected to the filter 60, and the filter 60 is connected to the coating die 20 through the second valve 50. Through the coordinated use of the second valve 50 and the filter 60, the filter 60 is used to connect the second screw pump 32 and the second valve 50. When the slurry is transported to the coating die 20 through the second screw pump 32, it can be filtered through the filter 60 to reduce the impurities in the slurry and improve the quality of the slurry. The second valve 50 is used to connect the filter 60 and the coating die 20, effectively controlling the transportation of the slurry filtered by the filter 60 to the coating die 20.

[0053] See also Figure 1 In some embodiments, the battery coating device 100 further includes a reflux pipe 40, which connects the coating die head 20 and the buffer tank 10. By setting the reflux pipe 40, the reflux pipe 40 is used to connect the coating die head 20 and the buffer tank 10, so that the remaining slurry after coating can be transported to the buffer tank 10 through the reflux pipe 40, so as to realize the recycling of the slurry. This not only reduces the waste of slurry and saves production costs, but also helps to improve the continuity and stability of the coating process.

[0054] The slurry conveying route of the utility model at least includes the following routes:

[0055] The slurry is transported from the buffer tank 10 to the coating die 20: the first valve 34 of at least one conveying unit 30 is opened, the slurry in the buffer tank 10 is transported to the magnetic filter 33 through the first screw pump 31, the demagnetized slurry is transported to the filter 60 through the second screw pump 32, the second valve 50 is opened, and the filtered slurry is transported to the coating die 20.

[0056] The slurry is transported from the coating die 20 to the buffer tank 10 : After coating, the remaining slurry of the coating die 20 is transported to the buffer tank 10 through the reflux pipe 40 .

[0057] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A battery coating device, characterized in that: The invention comprises a buffer tank (10), a coating die (20) and at least two conveying units (30), each of the conveying units (30) comprises a first screw pump (31), a second screw pump (32) and a magnetic filter (33), the first screw pump (31) is connected to the buffer tank (10), the second screw pump (32) is connected to the coating die (20), the magnetic filter (33) is arranged between the first screw pump (31) and the second screw pump (32), and the magnetic filter (33) is connected to the first screw pump (31) and the second screw pump (32).

2. The battery coating device according to claim 1, characterized in that: The magnetic filter (33) comprises a magnetic rod (331) and a cover body (332), wherein the cover body (332) is arranged on the top of the magnetic rod (331), the magnetic rod (331) has a receiving cavity (333), a cavity wall of the receiving cavity (333) is provided with a threaded structure (334), the magnetic rod (331) is provided with a slurry inlet (335) and a slurry outlet (336) which are connected to the receiving cavity (333), the magnetic rod (331) is connected to the first screw pump (31) through the slurry inlet (335), and the magnetic rod (331) is connected to the second screw pump (32) through the slurry outlet (336).

3. The battery coating device according to claim 2, characterized in that: The height H of the accommodating cavity (333) and the lead P of the thread structure (334) satisfy the relationship: H:P=(5~9):

1.

4. The battery coating device according to claim 1, characterized in that: The first screw pump (31) and the second screw pump (32) both comprise a base (311), a driving member (312), a material delivery pipe (313) and a material delivery shaft (314); the driving member (312) and the material delivery pipe (313) are both arranged on the base (311); the material delivery shaft (314) is arranged in the material delivery pipe (313); the output shaft of the driving member (312) passes through one end of the material delivery pipe (313) and is connected to the material delivery shaft (314); the material delivery pipe (313) is provided with a material inlet (3134) and a material outlet (3135); the material outlet (3135) is located at the other end of the material delivery pipe (313); Among them, the feed port (3134) of the feed pipe body (313) of the first screw pump (31) is connected to the buffer tank (10), the discharge port (3135) of the feed pipe body (313) of the first screw pump (31) is connected to the feed port (3134) of the feed pipe body (313) of the second screw pump (32) through the magnetic filter (33), and the discharge port (3135) of the feed pipe body (313) of the second screw pump (32) is connected to the coating die head (20).

5. The battery coating device according to claim 4, characterized in that: The material conveying pipe body (313) comprises a feeding piece (3131), a discharging piece (3132) and a connecting piece (3133); the feeding piece (3131), the connecting piece (3133) and the discharging piece (3132) are connected in sequence; the feeding port (3134) is arranged on the feeding piece (3131); the discharging port (3135) is arranged on the discharging piece (3132); one end of the material conveying shaft (314) is arranged in the discharging piece (3132); the other end of the material conveying shaft (314) is arranged in the connecting piece (3133); the output shaft of the driving piece (312) passes through one end of the material conveying piece (3131) and is connected to the material conveying shaft (314).

6. The battery coating device according to claim 5, characterized in that: The feeding shaft (314) includes a screw shaft (3141), a connecting shaft (3142), a first universal joint shaft (3143) and a second universal joint shaft (3144); the screw shaft (3141) is arranged in the connecting member (3133); the connecting shaft (3142) is arranged in the feeding member (3131); one end of the connecting shaft (3142) is connected to the output shaft of the driving member (312) through the first universal joint shaft (3143); the other end of the connecting shaft (3142) is connected to the screw shaft (3141) through the second universal joint shaft (3144).

7. The battery coating device according to claim 5, characterized in that: The inner diameter of the discharge member (3132) gradually decreases in a direction from the connecting member (3133) toward the discharge port (3135).

8. The battery coating device according to claim 1, characterized in that: Each of the conveying units (30) further includes a first valve (34), and the first screw pump (31) is connected to the buffer tank (10) via the first valve (34).

9. The battery coating device according to claim 1, characterized in that: The battery coating device (100) further comprises a second valve (50) and a filter (60), wherein the second screw pump (32) is connected to the filter (60), and the filter (60) is connected to the coating die (20) via the second valve (50).

10. The battery coating device according to claim 1, characterized in that: The battery coating device (100) further comprises a reflux pipe (40), wherein the reflux pipe (40) connects the coating die head (20) and the buffer tank (10).

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