Preparation device of lithium ion battery anode slurry

Abstract

The preparation device comprises a stirring barrel with an inner hole in the side wall, an upper sliding plate and a lower sliding plate are connected to the outer wall of the stirring barrel in a sealed and sliding mode, outer holes are formed in the upper sliding plate and the lower sliding plate, a control assembly is further arranged on the outer wall of the stirring barrel, and the control assembly is connected with the stirring barrel in a sealed and sliding mode. An outer hole of the upper sliding plate and an outer hole of the lower sliding plate alternately communicate with an inner hole, the upper sliding plate and the lower sliding plate are covered with a negative pressure suction assembly, a reciprocating push-pull assembly is arranged on the outer side of the negative pressure suction assembly and provided with a first circuit block and a second circuit block which are connected with a power source, and a switch is arranged on the rack. The switch is electrically connected with the control assembly, and a water inlet pipe is further arranged on the outer wall of the negative pressure suction assembly. According to the device, lower-layer slurry can be transferred into upper-layer slurry, water is synchronously added in the transferring process for premixing and dispersing, the water adding mode is innovated, and the device is suitable for efficient preparation of large-batch slurry.

Description

Technical Field

[0001] The invention relates to a mixing preparation device for battery slurry, in particular to a preparation device for lithium ion battery anode slurry. Background Art

[0002] When preparing lithium-ion battery anode slurry, lithiated carboxymethyl cellulose, graphite, conductive agent and other dry powders need to be fully stirred and mixed with water. In order to achieve the best dispersion effect, water needs to be added in batches multiple times to ensure that the solid content of the slurry can be accurately controlled. If water is added to the dry powder at one time, or too much water is added at a time or the interval between water additions is too short, the slurry will be unevenly dispersed. In addition, the way of adding water will also affect the dispersion effect of the slurry. Existing stirring devices mostly use spraying or direct input into the slurry to add water, but these water adding methods will cause the slurry concentration at the water addition position to be significantly lower than the surrounding slurry. In order to ensure the uniformity of the slurry, each time water is added, it takes a long time to stir and mix, resulting in a long production preparation time for the slurry and low efficiency.

[0003] In the process of mass preparation of lithium-ion battery anode slurry, sedimentation of the slurry is inevitable, resulting in differences in the density of the upper and lower layers of the slurry in the stirring tank, which in turn affects the overall uniformity of the slurry. To solve this problem, the existing stirring device is equipped with both a revolving stirring mechanism and a self-rotating stirring mechanism. The revolving stirring mechanism usually adopts a spiral stirring paddle, which has the characteristics of low shear force and low speed operation, and is suitable for mixing high-viscosity and high-solid content materials. The self-rotating stirring mechanism is usually a serrated dispersion disk, which has the characteristics of high speed and large shear force, and is suitable for the dispersion of particulate materials. Although the combination of these two stirring mechanisms can ensure that the slurry can flow between the upper and lower layers to avoid sedimentation, there are also problems such as complex device structure, the need to adapt and independently control the speeds of the two sets of mechanisms, and cumbersome operation and control. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a device for preparing anode slurry for lithium-ion batteries to solve the problem that adding water during stirring affects the uniformity of the slurry and the unevenness between the upper and lower layers of the slurry.

[0005] Technical solution: A preparation device for anode slurry of a lithium ion battery described in the present invention comprises a stirring barrel with an inner hole on the side wall, an upper outer wall of the stirring barrel is sealed and slidably connected with an upper slide plate, and a lower outer wall of the stirring barrel is sealed and slidably connected with a lower slide plate, both the upper slide plate and the lower slide plate are provided with outer holes, and a control component for synchronously controlling the reverse sliding of the upper slide plate and the lower slide plate is also provided on the outer wall of the stirring barrel, with the reverse sliding of the upper slide plate and the lower slide plate, the outer hole of the upper slide plate and the outer hole of the lower slide plate are alternately connected to the inner hole, the outer covers of the upper slide plate and the lower slide plate are provided with a negative pressure suction component, a reciprocating push-pull component is provided on the outside of the negative pressure suction component, and a first circuit block and a second circuit block with opposite current directions are respectively provided at both ends of the reciprocating push-pull component, the first circuit block and the second circuit block are respectively electrically connected to a power supply, when the reciprocating push-pull component reciprocates, the first circuit block and the second circuit block are alternately connected to a switch provided on a frame, and the switch is electrically connected to the control component, and a water inlet pipe is also provided on the outer wall of the negative pressure suction component.

[0006] Preferably, an end bar is respectively provided at the top and bottom ends of the mixing barrel, a waist bar is provided in the middle of the mixing barrel, the upper and lower ends of the upper slide plate are respectively slidably connected to the end bar and the waist bar, the upper and lower ends of the lower slide plate are respectively slidably connected to the waist bar and the end bar, and the inner walls of the upper slide plate and the lower slide plate are both sealed and slidably connected to the outer wall of the mixing barrel.

[0007] Preferably, the control component includes a pair of upper rollers symmetrically arranged on the side walls of the two upper slides and a pair of lower rollers arranged on the side walls of the two lower slides, a spring is arranged between the two upper slides or the two lower slides, an upper triangular block is abutted between the upper rollers, and a lower triangular block is abutted between the lower rollers, the upper triangular block is arranged on the outside of the upper rollers, and the lower triangular block is arranged on the inside of the lower rollers, the upper triangular block and the lower triangular block are in opposite directions, a connecting strip is arranged between the upper triangular block and the lower triangular block, a sealing strip that is sealingly and slidingly connected to the upper and lower slides is provided on the end strip and the waist strip, a mounting frame is provided on the sealing strip, a first motor is provided on the mounting frame, the first motor is electrically connected to the switch, a screw is threadedly connected to the middle part of the connecting strip, the inner end of the screw is rotatably connected to the waist strip, and the outer end of the screw is connected to the output shaft of the first motor.

[0008] Preferably, the negative pressure suction assembly comprises an arc-shaped plate which can fit with the outer walls of the upper and lower slide plates, a flexible connecting piece is provided between the arc-shaped plate and the mixing barrel and the sealing strip, and the reciprocating push-pull assembly is arranged on the outer side of the arc-shaped plate.

[0009] Preferably, the reciprocating push-pull assembly includes a push block arranged on the outer wall of the arc-shaped plate, the first circuit block and the second circuit block are respectively arranged at two ends of the push block, and the outer end of the push block is connected to a cylinder arranged on the frame.

[0010] Preferably, a feed pipe is provided at the top of the mixing barrel, a second motor and a discharge pipe are provided at the bottom of the mixing barrel, a stirring paddle is provided on the output shaft of the second motor, the stirring paddle is arranged in the mixing barrel, and the lower part of the stirring paddle is rotatably connected to the mixing barrel.

[0011] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0012] The present invention utilizes the negative pressure suction principle to draw the lower slurry with a higher density and a small amount of water into the sealed cavity between the mixing barrel and the arc plate, playing the role of premixing and diluting the slurry. Since the difference between the premixed and diluted slurry and the upper slurry with a lower density is small, the purpose of quickly and evenly dispersing the slurry can be achieved, avoiding the problems of poor slurry uniformity and long dispersion time caused by direct addition of water. The present invention can not only transfer the lower slurry to the upper slurry, but also simultaneously add water during the transfer process for premixing and dispersion, which innovates the way of adding water and solves two problems that affect the uniformity of slurry dispersion, and is suitable for the efficient preparation of large quantities of slurry.

[0013] The control component can synchronously control the reverse sliding of the upper slide plate and the lower slide plate, and the reciprocating motion of the control component is periodically linked with the reciprocating motion of the reciprocating push-pull component, so that when the arc plate is pulled, only the outer hole of the lower slide plate is connected with the inner hole, and when the arc plate is pushed, only the outer hole of the upper slide plate is connected with the inner hole, thereby ensuring the unidirectionality of sucking the lower layer slurry into the upper layer slurry, and the overall structure is simple and reliable, without the need for complex electronic control devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 A top view of the present invention;

[0016] Figure 3 for Figure 2 Middle AA section view;

[0017] Figure 4 for Figure 2 Middle BB section view;

[0018] Figure 5 It is the internal structure diagram of the present invention;

[0019] Figure 6 It is a schematic diagram of the connection structure between the control component and the upper and lower slide plates;

[0020] Figure 7 It is a schematic diagram of the structure of a mixing barrel;

[0021] Among them, 1-mixing barrel, 11-feeding pipe, 12-waist bar, 13-end bar, 14-inner hole, 15-discharging pipe, 2-arc plate, 21-push block, 211-first circuit block, 212-second circuit block, 213-cylinder, 22-switch, 23-connecting plate, 24-water inlet pipe, 3-sealing strip, 4-upper slide plate, 5-lower slide plate, 51-outer hole, 6-spring, 7-upper roller, 71-lower roller, 8-connecting strip, 81-lower triangular block, 82-upper triangular block, 9-mounting frame, 91-first motor, 92-screw, 10-second motor, 101-stirring paddle. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0023] like Figure 1-7 As shown, a preparation device for lithium-ion battery anode slurry comprises a stirring barrel 1 with an inner hole 14 on the side wall, an upper slide plate 4 is sealed and slidably connected to the upper outer wall of the stirring barrel 1, and a lower slide plate 5 is sealed and slidably connected to the lower outer wall of the stirring barrel 1. The specific connection method is: an end bar 13 is respectively provided at the top and bottom ends of the stirring barrel 1, and a waist bar 12 is provided in the middle of the stirring barrel 1. The upper and lower ends of the upper slide plate 4 are respectively slidably connected to the end bar 13 and the waist bar 12, and the upper and lower ends of the lower slide plate 5 are respectively slidably connected to the waist bar 12 and the end bar 13, and the inner walls of the upper slide plate 4 and the lower slide plate 5 are both sealed and slidably connected to the outer wall of the stirring barrel 1. Other conventional sliding connection modes can also be used, such as providing a slide groove on the outer wall of the stirring barrel 1 and providing an arc-shaped slider on the upper and lower slide plates 5.

[0024] In this embodiment, the outer covers of the upper slide plate 4 and the lower slide plate 5 are provided with a negative pressure suction component, and a reciprocating push-pull component is provided on the outside of the negative pressure suction component. The two ends of the reciprocating push-pull component are respectively provided with a first circuit block 211 and a second circuit block 212 with opposite current directions. The first circuit block 211 and the second circuit block 212 are respectively electrically connected to a power supply. When the reciprocating push-pull component reciprocates, the first circuit block 211 and the second circuit block 212 are alternately connected to a switch 22 provided on the frame, and the switch 22 is electrically connected to the control component. A water inlet pipe 24 is also provided on the outer wall of the negative pressure suction component.

[0025] In this embodiment, both the upper slide plate 4 and the lower slide plate 5 are provided with an outer hole 51, and the outer hole 51 is arranged corresponding to the inner hole 14 and can be communicated with the inner hole 14. A control assembly is vertically arranged on the outer wall of the mixing barrel 1, and the control assembly includes a pair of upper rollers 7 symmetrically arranged on the side walls of the two upper slide plates 4 and a pair of lower rollers 71 arranged on the side walls of the two lower slide plates 5. A spring 6 is arranged between the two upper slide plates 4 or the two lower slide plates 5. An upper triangular block 82 is abutted between the upper rollers 7, and a lower triangular block 81 is abutted between the lower rollers 71. The upper triangular block 82 is arranged on the outer side of the upper roller 7, and the lower triangular block 81 is arranged on the inner side of the lower roller 71. The upper triangular block 82 and the lower triangular block 81 are abutted against each other. 1, a connecting strip 8 is provided between the upper triangular block 82 and the lower triangular block 81, and a sealing strip 3 is provided on the end strip 13 and the waist strip 12, which is sealed and slidably connected to the upper slide plate 4 and the lower slide plate 5, and a mounting frame 9 is provided on the sealing strip 3, and a first motor 91 is provided on the mounting frame 9, and the first motor 91 is electrically connected to the switch 22, and a screw rod 92 is threadedly connected to the middle of the connecting strip 8, and the inner end of the screw rod 92 is rotatably connected to the waist strip 12, and the outer end of the screw rod 92 is connected to the output shaft of the first motor 91. The upper triangular block 82 and the lower triangular block 81 are preferably isosceles triangles, and the vertex angles of the two are arranged oppositely, and the vertex angle of the upper triangular block 82 can be inserted between a pair of upper rollers 7, and the vertex angle of the lower triangular block 81 can be inserted between a pair of lower rollers 71. The upper slide plate 4 and the lower slide plate 5, the control assembly, the negative pressure suction assembly and the reciprocating push-pull assembly can be symmetrically arranged in two groups on both sides of the mixing barrel 1, or only one group can be arranged on one side of the mixing barrel 1. A forward circuit may be provided in the first circuit block 211 , and a reverse circuit may be provided in the second circuit block 212 , so that the forward and reverse rotations of the first motor 91 are controlled after power is supplied.

[0026] In this embodiment, the negative pressure suction assembly includes an arc-shaped plate 2 that can be attached to the outer wall of the upper slide plate 4 and the lower slide plate 5. A flexible connecting piece 23 is provided between the arc-shaped plate 2 and the mixing barrel 1 and the sealing strip 3. The reciprocating push-pull assembly is arranged on the outer side of the arc-shaped plate 2. The sealing strip 3 can ensure that the slurry does not leak out from the sliding connection between the upper slide plate 4 and the lower slide plate 5 and the sealing strip 3. It forms a sealed cavity together with the connecting piece 23 and the arc-shaped plate 2 to prevent the slurry from leaking out. The material of the flexible connecting piece 23 can be elastic wear-resistant rubber or high-strength waterproof cloth. The water inlet pipe 24 is arranged on the arc-shaped plate 2, and a one-way valve can be provided at the connecting portion between the water inlet pipe 24 and the arc-shaped plate 2 to prevent the slurry from flowing back.

[0027] In this embodiment, the reciprocating push-pull assembly includes a push block 21 arranged on the outer wall of the arc plate 2, the first circuit block 211 and the second circuit block 212 are respectively arranged at both ends of the push block 21, and the outer end of the push block 21 is connected to a cylinder 213 arranged on the frame.

[0028] In this embodiment, a feed pipe 11 is provided at the top of the mixing barrel 1, a second motor 10 and a discharge pipe 15 are provided at the bottom of the mixing barrel 1, a stirring paddle 101 is provided on the output shaft of the second motor 10, the stirring paddle 101 is arranged in the mixing barrel 1, and the lower part of the stirring paddle 101 is rotatably connected to the mixing barrel 1.

[0029] Working process and principle:

[0030] In the initial state, the upper triangular block 82 is completely inserted between the pair of upper rollers 7, the spring 6 is stretched, the outer hole 51 of the upper slide plate 4 is completely offset from the inner hole 14 and is not connected. The pair of lower rollers 71 abut against each other, the top angle of the lower triangular block 81 abuts between the two lower rollers 71, and the outer hole 51 of the lower slide plate 5 is completely connected with the inner hole 14. The arc plate 2 is completely attached to the upper slide plate 4 and the lower slide plate 5, and the switch 22 is just out of contact with the second circuit block 212. The water inlet pipe 24 is connected to the water source. During processing, the powder and water are added to the mixing barrel 1 through the feed pipe 11, the second motor 10 is turned on, and the materials are mixed through the stirring paddle 101. After mixing for a period of time, the cylinder 213 is turned on, and the push block 21 is pulled and pulled. The push block 21 drives the arc plate 2 away from the upper slide plate 4 and the lower slide plate 5. Due to the sealing effect of the sealing strip 3 and the connecting piece 23, a negative pressure is formed between the arc plate 2 and the upper and lower slide plates 5, and only the outer hole 51 of the lower slide plate 5 is connected to the inner hole 14. Therefore, only the lower layer of slurry in the mixing barrel 1 is sucked out into the cavity between the arc plate 2 and the upper and lower slide plates 5, and a small amount of water is also sucked into the cavity. The water enters the cavity through the water inlet pipe 24. In the process of suction and push injection, the water and the lower layer of slurry are premixed and diluted in the cavity to form a premixed slurry. When the cylinder 213 reaches the maximum stroke, the first circuit block 211 on the push block 21 contacts and conducts with the switch 22, and the first motor 91 is energized and rotates accordingly. The first motor 91 drives the screw 92 to rotate, and the rotation of the screw 92 causes the connecting bar 8 to move outward. The connecting bar 8 simultaneously drives the upper triangular block 82 and the lower triangular block 81 to move outward until the upper triangular block 82 withdraws from between the two upper rollers 7. Under the pulling force of the spring 6, the two upper rollers 7 and the two upper slide plates 4 move relative to each other until the outer hole 51 of the upper slide plate 4 is connected with the inner hole 14 at the upper part of the mixing barrel 1. At the same time, the lower triangular block 81 is synchronously inserted into the two lower rollers 71, and the lower rollers 71 and the lower slide plate 5 are pushed to both sides until the outer hole 51 of the lower slide plate 5 is completely staggered and closed with the inner hole 14 at the lower part of the mixing barrel 1, and the spring 6 is stretched. After the upper triangular block 82 and the lower triangular block 81 move into place, the cylinder 213 just drives the push block 21 to start advancing toward the mixing barrel 1, the first circuit block 211 is disconnected from the switch 22, the first motor 91 is powered off and stops rotating, the upper triangular block 82 and the lower triangular block 81 keep their positions unchanged, and the push block 21 pushes forward to drive the arc plate 2 to squeeze the slurry between the arc plate 2 and the upper and lower slide plates 5. Since at this time only the outer hole 51 of the upper slide plate 4 is connected to the inner hole 14 on the upper part of the mixing barrel 1, the premixed slurry can only be injected into the upper slurry of the mixing barrel 1 by the upper slide plate 4. Until the second circuit block 212 contacts and conducts with the switch 22, since the circuit direction in the second circuit block 212 is opposite to that in the first circuit block 211, the first motor 91 is energized again to drive the screw 92 to reverse, and then the connecting bar 8 drives the upper triangular block 82 and the lower triangular block 81 to move inward, and under the action of the spring 6, they are restored to the initial state. At this time, the cylinder 213 immediately repeats the action of pulling and pushing the push block 21 until the second circuit block 212 is disconnected from the switch 22.In this way, by repeating the above-mentioned pulling and pushing action of the arc plate 2, the lower layer slurry can be unidirectionally fed into the upper layer of the mixing barrel 1, and water is premixed in the process to improve the mixing uniformity and mixing processing efficiency of the slurry.

Claims

1. A device for preparing anode slurry for lithium-ion batteries, characterized in that: The invention comprises a mixing barrel (1) having an inner hole (14) on its side wall, an upper slide plate (4) being sealingly and slidably connected to the upper outer wall of the mixing barrel (1), and a lower slide plate (5) being sealingly and slidably connected to the lower outer wall of the mixing barrel (1), both the upper slide plate (4) and the lower slide plate (5) being provided with outer holes (51), and a control component for synchronously controlling the reverse sliding of the upper slide plate (4) and the lower slide plate (5) being provided on the outer wall of the mixing barrel (1), and accompanying the reverse sliding of the upper slide plate (4) and the lower slide plate (5), the outer holes (51) of the upper slide plate (4) and the outer holes (51) of the lower slide plate (5) are alternately connected to the inner hole (14), and the upper slide plate (4) A negative pressure suction component is provided on the outer cover of the lower slide plate (5), a reciprocating push-pull component is provided on the outer side of the negative pressure suction component, a first circuit block (211) and a second circuit block (212) with opposite current directions are provided at two ends of the reciprocating push-pull component, the first circuit block (211) and the second circuit block (212) are electrically connected to a power source respectively, when the reciprocating push-pull component reciprocates, the first circuit block (211) and the second circuit block (212) are alternately connected to a switch (22) provided on the frame, the switch (22) is electrically connected to the control component, and a water inlet pipe (24) is also provided on the outer wall of the negative pressure suction component.

2. The device for preparing anode slurry for lithium-ion batteries according to claim 1, characterized in that: The top and bottom ends of the mixing barrel (1) are each provided with an end strip (13), the middle portion of the mixing barrel (1) is provided with a waist strip (12), the upper and lower ends of the upper slide plate (4) are respectively slidably connected to the end strip (13) and the waist strip (12), the upper and lower ends of the lower slide plate (5) are respectively slidably connected to the waist strip (12) and the end strip (13), and the inner walls of the upper slide plate (4) and the lower slide plate (5) are both sealed and slidably connected to the outer wall of the mixing barrel (1).

3. The device for preparing anode slurry for lithium-ion batteries according to claim 2, characterized in that: The control assembly comprises a pair of upper rollers (7) symmetrically arranged on the side walls of the two upper slides (4) and a pair of lower rollers (71) arranged on the side walls of the two lower slides (5); a spring (6) is arranged between the two upper slides (4) or the two lower slides (5); an upper triangular block (82) is abutted between the upper rollers (7); a lower triangular block (81) is abutted between the lower rollers (71); the upper triangular block (82) is arranged on the outside of the upper rollers (7); the lower triangular block (81) is arranged on the inside of the lower rollers (71); the upper triangular block (82) and the lower triangular block (81) are in opposite directions; ... 2) and the lower triangular block (81), a connecting strip (8) is provided between the end strip (13) and the waist strip (12), a sealing strip (3) is provided on the end strip (13) and the waist strip (12) and is sealed and slidably connected to the upper slide plate (4) and the lower slide plate (5), a mounting frame (9) is provided on the sealing strip (3), a first motor (91) is provided on the mounting frame (9), the first motor (91) is electrically connected to the switch (22), a screw rod (92) is threadedly connected to the middle part of the connecting strip (8), the inner end of the screw rod (92) is rotatably connected to the waist strip (12), and the outer end of the screw rod (92) is connected to the output shaft of the first motor (91).

4. The device for preparing anode slurry for lithium-ion batteries according to claim 3, characterized in that: The negative pressure suction assembly comprises an arc-shaped plate (2) which can be fitted with the outer walls of an upper slide plate (4) and a lower slide plate (5); a flexible connecting piece (23) is provided between the arc-shaped plate (2) and the mixing barrel (1) and the sealing strip (3); and the reciprocating push-pull assembly is provided on the outer side of the arc-shaped plate (2).

5. The device for preparing anode slurry for lithium-ion batteries according to claim 4, characterized in that: The reciprocating push-pull assembly comprises a push block (21) arranged on the outer wall of the arc-shaped plate (2), the first circuit block (211) and the second circuit block (212) are respectively arranged at two ends of the push block (21), and the outer end of the push block (21) is connected to a cylinder (213) arranged on a frame.

6. The device for preparing anode slurry for lithium-ion batteries according to claim 1, characterized in that: A feed pipe (11) is provided at the top of the stirring barrel (1), a second motor (10) and a discharge pipe (15) are provided at the bottom of the stirring barrel (1), a stirring paddle (101) is provided on the output shaft of the second motor (10), the stirring paddle (101) is arranged in the stirring barrel (1), and the lower part of the stirring paddle (101) is rotatably connected to the stirring barrel (1).

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