Polymer lithium ion battery preparation device and method

Abstract

The application discloses a preparation device for polymer lithium ion batteries, which comprises a mixing box body, a power mechanism and a stirring assembly. The power mechanism is fixedly arranged on the mixing box body, and the stirring assembly is arranged in the mixing box body. The power mechanism is in transmission connection with the stirring assembly and is used for driving the stirring assembly to stir raw materials. The stirring assembly is composed of stirring mechanisms. One of the stirring mechanisms is in transmission connection with the power mechanism, and every two adjacent stirring mechanisms are in transmission connection through transmission mechanisms. The transmission mechanisms are used for changing the rotating directions of two adjacent stirring mechanisms, so that the two adjacent stirring mechanisms rotate reversely, and then the two adjacent stirring assemblies rotate reversely. The raw materials in the stirring box body are fully mixed through the forward shearing force and the reverse shearing force.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a preparation device and method of a polymer lithium ion battery. BACKGROUND

[0002] A battery refers to a cup, a groove or other container or part of a composite container containing an electrolyte solution and a metal electrode to generate current, a device capable of converting chemical energy into electrical energy, and has positive and negative electrodes.

[0003] In the battery manufacturing process, the mixing of positive and negative electrode materials is relatively important. Additives need to be added during the mixing process of material stirring. Since the additives are sticky and not easy to mix with the fixed raw materials, the additives can also easily wrap the fixed raw materials to form lumps, which will affect the use effect of the battery. SUMMARY

[0004] In order to solve the above problems existing in the prior art, the application aims to provide a preparation device and method of a polymer lithium ion battery.

[0005] The technical scheme adopted by the application is as follows:

[0006] A preparation device of a polymer lithium ion battery comprises a mixing box, a power mechanism and a stirring assembly. The power mechanism is fixedly arranged on the mixing box, the stirring assembly is arranged in the interior of the mixing box, the power mechanism is in transmission connection with the stirring assembly, and the power mechanism is used to drive the stirring assembly to stir raw materials.

[0007] The stirring assembly is composed of stirring mechanisms. One of the stirring assemblies is in transmission connection with the power mechanism, and each two adjacent stirring assemblies are in transmission connection through a transmission mechanism. The transmission mechanism is used to change the rotation directions of two adjacent stirring mechanisms, so that the two adjacent stirring mechanisms rotate in opposite directions.

[0008] As a preferred embodiment of the application, the stirring mechanism is composed of a stirring sleeve and a stirring ring. The stirring sleeve and the stirring ring are connected through a stirring support. The stirring sleeve in the stirring mechanism in transmission connection with the power mechanism is fixedly connected with a driving ring.

[0009] As a preferred embodiment of the application, the power mechanism comprises a motor fixedly connected to the mixing box. The output shaft of the motor is fixedly connected with a driving gear. The driving gear is in meshing connection with the driving ring.

[0010] As preferred of the present application, the transmission mechanism comprises a transmission rod fixed inside the mixing box, and third bevel gears are arranged on both sides of the transmission rod for connecting two adjacent stirring assemblies;

[0011] The stirring sleeves in the adjacent two stirring assemblies are rotationally connected, and each stirring sleeve is provided with a transmission ring on the inner side close to the connecting end, and the third bevel gears are in transmission connection with the two transmission rings.

[0012] As preferred of the present application, the inside of the stirring support is provided with a moving support which is slidingly connected in a sliding groove arranged on the stirring support, and an acting plate is arranged on the moving support and extends to both sides of the stirring support, and a slot hole is arranged on one side of the moving support close to the stirring sleeve.

[0013] As preferred of the present application, a first bevel gear is rotationally connected on the stirring sleeve, a rocker is fixedly connected on the rotation center of the first bevel gear, and the swinging end of the rocker is slidingly connected in the slot hole.

[0014] As preferred of the present application, the transmission mechanism further comprises a second bevel gear fixedly connected on the transmission rod, and the second bevel gear is in meshing connection with the first bevel gear.

[0015] As preferred of the present application, the stirring ring is tightly arranged on the inner wall of the mixing box and is sealingly arranged with the inside of the mixing box, an annular groove is arranged on the outside of the stirring ring, and the annular groove is in communication with a through hole arranged on the stirring support.

[0016] As preferred of the present application, filling boxes are arranged on both sides of the mixing box, the filling boxes are in communication with the annular groove through a filling hole, and a filling pipe is further in communication with the outside of the filling box.

[0017] A preparation method of a polymer lithium ion battery comprises the following steps:

[0018] S1: positive electrode sheet preparation: lithium positive electrode material and positive electrode conductive agent are poured into a mixing box for stirring and mixing, a power mechanism continuously drives a stirring assembly to stir, and a filling box on both sides of the mixing box is used to add a binder into the mixing box for uniform stirring, and the positive electrode slurry is stirred until the viscosity reaches 4000-10000 mPa.s to obtain a positive electrode slurry;

[0019] S2: negative electrode sheet preparation: carbon material and negative electrode conductive agent are poured into a mixing box for stirring and mixing, a binder is added for uniform stirring, and the viscosity reaches 2000-8000 mPa.s to obtain a negative electrode slurry;

[0020] S3: Preparation of positive and negative electrode sheets: The positive electrode slurry obtained in step S1 is coated on aluminum foil, dried, rolled and die-cut to obtain the positive electrode sheet; the negative electrode slurry obtained in step S2 is coated on carbon-coated copper foil, dried, rolled and die-cut a second time to obtain the negative electrode sheet.

[0021] S4: Battery packaging: The positive and negative electrode sheets obtained in S3 are placed in a separator and stacked, then the tabs are welded, and then the battery is packaged with a polymer aluminum-plastic film.

[0022] S5: Electrolyte injection, formation and capacity testing: First injection, injecting the first type of electrolyte, first settling and pressurized formation; then second settling and second injection, injecting the second type of electrolyte, third settling, and finally capacity testing and aging at room temperature to prepare the lithium-ion battery.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This device drives the stirring components to stir through a power mechanism. Multiple stirring components are arranged in conjunction with a transmission mechanism to change the rotation direction of two adjacent stirring components, so that the two adjacent stirring components rotate in opposite directions. This achieves the opposite rotation of two adjacent stirring components, and the raw materials in the stirring tank are fully mixed through positive and negative shear forces.

[0025] 2. This device, by setting up action plates, shortens the distance between the two action plates when they rotate in opposite directions with the adjacent stirring components, thereby squeezing the materials being stirred during the stirring process and breaking up any clumps of raw materials, thus preventing the formation of clumps during stirring. Attached Figure Description

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0027] Figure 1 This is a schematic diagram of the front structure of the preparation device of the present invention;

[0028] Figure 2 This is a schematic diagram of the axial structure of the preparation device of the present invention;

[0029] Figure 3 This is a schematic diagram of the axial side structure of the mixing box of the present invention;

[0030] Figure 4 This is a schematic diagram of the axial structure of the stirring assembly of the present invention;

[0031] Figure 5 This is a schematic diagram of the axial side structure of a portion of the stirring assembly of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the stirring assembly and transmission mechanism of the present invention;

[0033] Figure 7 is a structural schematic diagram of the transmission mechanism of the present application.

[0034] In the figure: 1-mixing box, 101-upper feeding port, 102-discharging port, 2-power mechanism, 201-motor, 202-driving gear, 203-driving ring, 3-stirring mechanism, 301-stirring sleeve, 3011-driving ring, 302-stirring ring, 3021-annular groove, 303-stirring support, 3031-through hole, 3032-slotted hole, 304-action plate, 3041-moving support, 305-first bevel gear, 306-rocker, 4-transmission mechanism, 401-transmission rod, 402-second bevel gear, 403-third bevel gear, 5-filling box, 501-filling pipe, 502-filling hole. DETAILED DESCRIPTION

[0035] The present application is further described below in conjunction with the drawings and specific embodiments.

[0036] The present application is further described below in conjunction with the drawings and specific embodiments. Figures 1-7 The specific embodiment of the present application is described below, a preparation device of a polymer lithium ion battery, comprising a mixing box 1, a power mechanism 2 and a stirring assembly, the power mechanism 2 is fixedly arranged on the mixing box 1, the stirring assembly is arranged in the interior of the mixing box 1, the power mechanism 2 is in transmission connection with the stirring assembly, for driving the stirring assembly to stir raw materials;

[0037] The stirring assembly is composed of a stirring mechanism 3, one of the stirring assemblies is in transmission connection with the power mechanism 2, and every two adjacent stirring assemblies are in transmission connection through a transmission mechanism 4, the transmission mechanism 4 is used for changing the rotation direction of two adjacent stirring mechanisms 3, so that the two adjacent stirring mechanisms 3 rotate reversely.

[0038] The device drives the stirring assembly to stir through the driving power mechanism 2, adopts the setting of multiple stirring assemblies, and cooperates with the transmission mechanism 4, the transmission mechanism 4 is used for changing the rotation direction of two adjacent stirring mechanisms 3, so that the two adjacent stirring mechanisms 3 rotate reversely, thereby realizing the reverse rotation of two adjacent stirring assemblies, and fully mixing the raw materials in the stirring box through the forward shear force and the reverse shear force, reducing the generation of clumps.

[0039] As preferred in the present application, the stirring mechanism 3 is composed of a stirring sleeve 301 and a stirring ring 302, the stirring sleeve 301 and the stirring ring 302 are composed through a stirring support 303, and the stirring sleeve 301 in the stirring mechanism 3 in transmission connection with the power mechanism 2 is fixedly connected with a driving ring 203.

[0040] Specifically, the power mechanism 2 comprises a motor 201 fixedly connected to the mixing box 1, and a drive gear 202 fixedly connected to an output shaft of the motor 201, and the drive gear 202 is in meshing connection with the drive ring 203.

[0041] Further, the transmission mechanism 4 comprises a transmission rod 401 fixedly arranged in the mixing box 1, and third bevel gears 403 arranged on both sides of the transmission rod 401 for connecting two adjacent stirring assemblies.

[0042] The stirring sleeves 301 in the two adjacent stirring assemblies are in rotation connection (sealed arrangement is required between the two adjacent stirring sleeves 301), and each stirring sleeve 301 is provided with a transmission ring 3011 on the inner side close to the connecting end, and the third bevel gears 403 are in transmission connection with the two transmission rings 3011.

[0043] The power mechanism 2 drives the drive gear 202 to rotate by starting the motor 201, and drives the stirring mechanism 3 fixedly connected to the drive ring 203 to rotate by the meshing connection between the drive gear 202 and the drive ring 203, so as to stir the raw materials of the electrode; since the drive ring 203 is fixedly arranged on one of the stirring sleeves 301, the power mechanism 2 can drive one of the stirring sleeves 301 to rotate; since the transmission rings 3011 are arranged on the two adjacent stirring sleeves 301, and the third bevel gears 403 are arranged on both sides of the two transmission rings 3011 and are in transmission connection through the third bevel gears 403, when one of the stirring sleeves 301 rotates, the transmission ring 3011 on the next stirring sleeve 301 is engaged by the third bevel gear 403, so as to drive the next stirring sleeve 301 to rotate reversely, thereby realizing the reverse rotation of the two adjacent stirring assemblies, and the raw materials in the stirring box are fully mixed by the forward shear force and the reverse shear force.

[0044] Preferably, the stirring support 303 is provided with a moving support 3041, the moving support 3041 is slidingly connected in a sliding groove 3032 arranged on the stirring support 303, the moving support 3041 is provided with an action plate 304 extending to both sides of the stirring support 303, and the moving support 3041 is provided with a slot on one side close to the stirring sleeve 301.

[0045] Specifically, the stirring sleeve 301 is rotationally connected with a first bevel gear 305, the first bevel gear 305 is fixedly connected to a rocking lever 306 at the rotation center of the first bevel gear 305, and the swinging end of the rocking lever 306 is slidingly connected in the slot.

[0046] Further, the transmission mechanism 4 further comprises a second helical gear 402 fixedly connected to the transmission rod 401, and the second helical gear 402 is in meshing connection with the first helical gear 305.

[0047] During the rotation of the stirring sleeve 301, the first helical gear 305 meshes with the second helical gear 402, drives the rocker 306 to rotate, and the rocking end of the rocker 306 pushes the moving bracket 3041 to reciprocate up and down on the stirring bracket 303, so that the action plate 304 connected to the moving bracket 3041 moves downward.

[0048] The action plate 304 is made of elastic material, and when the adjacent stirring assembly is reversely rotated, the distance between the two action plates 304 is shortened, the material is extruded during stirring, and the agglomerated raw materials are extruded, so that the fixed raw materials (nickel-cobalt-manganese lithium cathode material and positive electrode conductive agent or amorphous carbon coated graphite and negative electrode conductive agent) are mixed more uniformly with the oil-based solution or water-based binder, and the oil-based solution or water-based binder is prevented from being wrapped on the solid raw materials to form agglomerates.

[0049] As a preferred embodiment of the present application, the stirring ring 302 is tightly attached to the inner wall of the mixing box 1, and the inside of the mixing box 1 is sealed, and the outer side of the stirring ring 302 is provided with an annular groove 3021, and the annular groove 3021 is in communication with the through hole 3031 provided on the stirring bracket 303.

[0050] Specifically, the mixing box 1 is provided with a filling box 5 on both sides, and the filling box 5 is in communication with the annular groove 3021 through the filling hole 502, and the outer side of the filling box 5 is also communicated with the filling pipe 501.

[0051] The upper side of the mixing box 1 is provided with an upper feeding port 101, and the upper side of the mixing box 1 is provided with a discharging port 102, and the upper feeding port 101 and the discharging port 102 are both provided with a switch.

[0052] By arranging the filling box 5 on the side of the mixing box 1, when the oil-based solution or water-based binder is added into the filling box 5, the oil-based solution or water-based binder can be transported into the stirring assembly through the filling hole 502, and during the stirring process, it is added to the fixed raw materials through the through hole 3031. Such arrangement can make the oil-based solution or water-based binder more uniform when it is preliminarily mixed with the fixed raw materials, and prevent the oil-based solution or water-based binder from forming agglomerates with the fixed raw materials due to its own viscosity during the stirring process.

[0053] A preparation method of a polymer lithium ion battery comprises the following steps:

[0054] S1: positive electrode sheet preparation: lithium positive electrode material and positive electrode conductive agent (acetylene black) are poured into a mixing box and stirred and mixed, the power mechanism continuously drives the stirring assembly to stir, and the mixing box adds adhesive (PVDF) into the mixing box through the filling box on both sides of the mixing box to stir uniformly, the positive electrode slurry is stirred to a viscosity of 4000-10000 mPa.s to obtain a positive electrode slurry;

[0055] S2: negative electrode sheet preparation: carbon material and negative electrode conductive agent (acetylene black) are poured into a mixing box and stirred and mixed, and the binder (SBR) is added and stirred uniformly to a viscosity of 2000-8000 mPa.s to obtain a negative electrode slurry;

[0056] S3: preparation of positive and negative electrode sheets: the positive electrode slurry obtained in step S1 is coated on an aluminum foil, dried, rolled, and die cut to obtain a positive electrode sheet; the negative electrode slurry obtained in step S2 is coated on a carbon-coated copper foil, dried, and then rolled and die cut twice to obtain a negative electrode sheet;

[0057] S4: battery packaging: the positive and negative electrode sheets obtained in step S3 are placed on a separator for lamination, then the tabs are welded, and a polymer aluminum plastic film is packaged;

[0058] S5: liquid injection, formation, and capacity distribution: first liquid injection, injection of the first electrolyte, once standing, and pressure formation; then twice standing, twice liquid injection, injection of the second electrolyte, three times standing, and finally capacity distribution and room temperature aging to prepare a lithium ion battery.

[0059] As preferred in the present application, the lithium positive electrode material is composed of one or more of LiCoO2, LiNiO2, and LiMnO2; the carbon material is composed of natural graphite, coke, and carbon fiber, etc.

[0060] As preferred in the present application, in S5, the liquid injection process is once liquid injection after packaging, i.e., injection of the first electrolyte, pre-sealing, high-temperature standing for 1-24 hours, and twice sealing with a vacuum degree ≤-70 KPa; high-temperature pressure formation, the formation process is 0.1C charging to 50% SOC, 0.3C charging to 80% SOC, the clamp pressure is 4.76-7.93 Kgf / cm2, and the formation temperature is 35-60℃; twice standing after formation, which is room temperature standing for 1-24 hours; the liquid injection amount during the second liquid injection is 10% of the first liquid injection, and the standing temperature after the second liquid injection is 35-60℃; the parameters of the second twice sealing require a packaging strength ≥50 N / 15 mm and a packaging vacuum degree ≤-30 KPa.

[0061] Specifically, the first injection is the first electrolyte, and the first electrolyte is configured by mixing electrolyte lithium salt, organic solvent and additives; wherein the lithium salt is added in an amount of 1-1.3M, the additives account for 2%-7% of the total weight, and the rest is organic solvent; the organic solvent is a mixture of EC, DEC and DMC in a ratio of 1:1:1, the electrolyte lithium salt is lithium hexafluorophosphate, and the concentration is 1M; the additives include negative electrode film forming additives, PS additives and high temperature additives; the negative electrode film forming additives are VC, and the addition amount accounts for 1%-3% of the total weight; the PS additive accounts for 1%-3% of the total weight, the high temperature additive is LiBOB, and the addition amount accounts for 0.5%-2% of the total weight.

[0062] Specifically, the second injection is the second electrolyte, and the second electrolyte is configured by mixing electrolyte lithium salt, organic solvent and additives; wherein the lithium salt is added in an amount of 1-1.3M.

[0063] The present application is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solutions falling within the scope defined by the claims of the present application fall within the protection scope of the present application.

Claims

1. An apparatus for preparing a polymer lithium-ion battery, characterized in that: It includes a mixing chamber (1), a power mechanism (2) and a stirring assembly. The power mechanism (2) is fixedly installed on the mixing chamber (1), and the stirring assembly is installed inside the mixing chamber (1). The power mechanism (2) and the stirring assembly are connected by a transmission to drive the stirring assembly to stir the raw materials. The stirring assembly consists of a stirring mechanism (3), one of which is connected to the power mechanism (2) by transmission. Each pair of adjacent stirring assemblies is connected by a transmission mechanism (4). The transmission mechanism (4) is used to change the rotation direction of two adjacent stirring mechanisms (3) so that the two adjacent stirring mechanisms (3) rotate in opposite directions. The stirring mechanism (3) is composed of a stirring sleeve (301) and a stirring ring (302). The stirring sleeve (301) and the stirring ring (302) are connected by a stirring bracket (303). A drive ring (203) is fixedly connected to the stirring sleeve (301) of the stirring mechanism (3) which is connected to the power mechanism (2). The stirring support (303) is provided with a movable support (3041) inside. The movable support (3041) is slidably connected in a groove (3032) provided on the stirring support (303). An action plate (304) is provided on the movable support (3041). The action plate (304) extends to both sides of the stirring support (303). The movable support (3041) is provided with a slot on the side near the stirring sleeve (301). A first helical gear (305) is rotatably connected to the stirring sleeve (301), and a rocker arm (306) is fixedly connected to the rotation center of the first helical gear (305). The swing end of the rocker arm (306) is slidably connected in the slot.

2. The apparatus for preparing a polymer lithium-ion battery according to claim 1, characterized in that: The power mechanism (2) includes a motor (201) fixedly connected to the mixing box (1), and a drive gear (202) fixedly connected to the output shaft of the motor (201), and the drive gear (202) meshing with the drive ring (203).

3. The apparatus for preparing a polymer lithium-ion battery according to claim 1, characterized in that: The transmission mechanism (4) includes a transmission rod (401), which is fixed inside the mixing box (1). Both sides of the transmission rod (401) are provided with a third helical gear (403) for connecting two adjacent stirring components. The stirring sleeves (301) in two adjacent stirring assemblies are rotatably connected, and each stirring sleeve (301) is provided with a transmission ring (3011) on the inner side near the connection end. The third helical gear (403) is connected to the two transmission rings (3011) for transmission.

4. The apparatus for preparing a polymer lithium-ion battery according to claim 3, characterized in that: The transmission mechanism (4) further includes a second helical gear (402) fixedly connected to the transmission rod (401), and the second helical gear (402) meshes with the first helical gear (305).

5. The apparatus for preparing a polymer lithium-ion battery according to claim 1, characterized in that: The stirring ring (302) is tightly attached to the inner wall of the mixing box (1) and is sealed to the interior of the mixing box (1). An annular groove (3021) is provided on the outer side of the stirring ring (302), and the annular groove (3021) communicates with the through hole (3031) provided on the stirring support (303).

6. The apparatus for preparing a polymer lithium-ion battery according to claim 5, characterized in that: The mixing tank (1) is provided with filling tanks (5) on both sides. The filling tanks (5) are connected to the annular groove (3021) through filling holes (502). The outside of the filling tanks (5) is also connected to a filling pipe (501).

7. A method for preparing a polymer lithium-ion battery, characterized in that: Based on the apparatus for preparing polymer lithium-ion batteries according to claims 1-6, the method for preparing polymer lithium-ion batteries includes the following steps: S1: Positive electrode preparation: Lithium positive electrode material and positive electrode conductive agent are poured into the mixing box (1) and stirred. While the power mechanism (2) continuously drives the stirring component to stir, the adhesive is added into the mixing box (1) through the filling box (5) on both sides of the mixing box (1) and stirred evenly to obtain positive electrode slurry. S2: Negative electrode preparation: Pour carbon material and negative electrode conductive agent into mixing box (1) and stir to mix. Add binder and stir to obtain negative electrode slurry; S3: Preparation of positive and negative electrode sheets: The positive electrode slurry obtained in step S1 is coated on aluminum foil, dried, rolled and die-cut to obtain the positive electrode sheet; the negative electrode slurry obtained in step S2 is coated on carbon-coated copper foil, dried, rolled and die-cut a second time to obtain the negative electrode sheet. S4: Battery packaging: The positive and negative electrode sheets obtained in S3 are placed in a separator and stacked, then the tabs are welded, and then the battery is packaged with a polymer aluminum-plastic film. S5: Electrolyte injection, formation and capacity testing: First injection, injecting the first type of electrolyte, first settling and pressurized formation; then second settling and second injection, injecting the second type of electrolyte, third settling, and finally capacity testing and aging at room temperature to prepare the lithium-ion battery.

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