CN211858812U - Lithium-ion cell stacking equipment - Google Patents

Abstract

The utility model discloses a lithium ion battery cell lamination equipment, lithium ion battery cell lamination equipment is including making the heap module, cutting module, transportation module, stack laminating module and hot pressing module: the stacking module arranges the positive plates and the negative plates at intervals and hot presses the positive plates and the negative plates on one side surface of the diaphragm to form continuous stacking, or hot presses the positive plates on one side surface of the diaphragm and hot presses the negative plates on the corresponding positions of the other side surface of the diaphragm to form continuous stacking; the cutting module cuts the continuous stack into unit stacks; the transport module transports the cell stack in-line; the stacking and attaching module is used for stacking the units and the diaphragms to prepare a plurality of layers of stacked battery cores which are arranged in order in a stacking mode; and the hot-pressing module hot-presses the multilayer stacked battery cells to obtain the lithium ion battery cell. The equipment is simple in design, low in equipment cost and high in lamination precision, and the preparation efficiency and the yield of the lithium ion battery cell are effectively improved.

Description

Lithium-ion cell stacking equipment

technical field

The utility model relates to the field of energy storage devices, in particular to a lithium ion cell stacking device.

Background technique

Lithium-ion batteries have become the mainstream energy storage batteries in current consumer electronics, electric vehicles and other application scenarios due to their high operating voltage, high energy density, long cycle life, and no memory effect. At present, industries such as consumer electronics and electric vehicles have ushered in a stage of rapid growth, and the demand for lithium-ion batteries has increased sharply. However, at present, the production efficiency of lithium ion batteries is low due to the complex production process and numerous procedures, resulting in low product yield. Among the many processes in the production of lithium-ion batteries, the cell assembly process is particularly important, which is mainly divided into the lamination assembly process and the winding assembly process. With the advantages of large side utilization rate and low internal resistance, it has the advantages of effectively improving safety and energy density in the production of high energy density lithium batteries, and has more development prospects.

The current mainstream lithium-ion battery lamination assembly process is divided into two types according to the process category: Z-type lamination and bag-making lamination. Among them, (1) Z-type lamination is to die-cut or cut the positive and negative plates of the lithium ion battery into single pieces, respectively, and then, the diaphragm moves in a zigzag manner. The sheet is placed on the separator, and finally a multi-layer stack structure of "separator-positive electrode-separator-negative electrode" is formed. (2) Bag-making lamination process, firstly, the positive pole piece that has been cut into shape, the upper and lower two rolls of separators, and the positive pole piece is heat-sealed in the upper and lower separators by means of heat-sealing separators to complete the bag-making process. Next, the "separator-cathode-separator" unit obtained by bag-making is subjected to a cutting process to form a bag-type electrode piece. Finally, the cut pocket pole piece and the corresponding negative pole piece are grasped by a robotic arm to form a multi-layer stack structure with "pocket pole piece (separator-positive electrode-separator)-negative electrode" as a unit.

For example, the patent No. CN109244554A discloses a lithium-ion battery Z-shaped lamination equipment and its process. The Z-shaped lamination process is adopted to realize seamless connection between die-cutting or cutting and Z-shaped lamination, eliminating the need for poles. Plate transfer equipment and facilities, and use hot pressing to fix the pole pieces.

For another example, the patent with the patent number of CN201510734609.6 discloses a lithium ion battery lamination unit, a battery cell and a preparation method thereof, and a lithium ion battery. The lithium ion battery lamination unit includes an inner electrode sheet, a diaphragm, and an inner electrode sheet. For the outer electrode sheets with opposite polarities, the separators are respectively bonded to the two sides of the inner electrode sheet by adhesives, and the outer electrode sheets are bonded to the outer sides of the separators by adhesives.

For another example, the patent No. CN201710643033.1 discloses a battery pole piece die-cutting bag lamination integrated device, including a positive pole piece die-cutting mechanism, a negative pole piece die-cutting mechanism, a composite bag making mechanism and a lamination mechanism. The positive electrode die-cutting mechanism and the negative electrode die-cutting mechanism are respectively used for die-cutting the positive electrode and the negative electrode, and the composite bag-making mechanism is used for bag-making and packaging of the positive electrode after die-cutting. The mechanism is used to stack the bag-made positive electrode sheets and the die-cut negative electrode sheets at intervals.

For another example, the patent No. CN102760858A discloses a bag laminating machine and a bag laminating method. The bag laminating machine involved in the invention includes a bag making system and a laminating system, as well as a moving device. The first control component in the device can control the first manipulator to move between the bag making system and the stacking system. Each time a bag-type pole piece is made in the bag making system, the moving device directly moves it to the stacking system for stacking. piece.

The above two lithium-ion cell stacking processes have their own technical problems. Among them, the Z-type lamination process involves complex movements such as Z-type diaphragm belt travel, pole piece grabbing, etc., the overall design of the equipment is complex, the required mechanical arms, roller control mechanisms are many, and the equipment cost is high, and Z-type lamination The process pole piece grabbing and placing efficiency is low, and the precision controllability is poor. In the bag-making lamination process, due to the gap between the pole piece and the diaphragm bag during the bag making process, the movement of the pole piece will reduce the final lamination accuracy. In addition, the bag-making process still needs to perform the grabbing action of the bag-type pole piece and the pole piece, so the equipment cost and efficiency also have problems to be solved.

Therefore, it is necessary to provide a new lithium-ion cell stacking device to overcome the above-mentioned defects of the prior art.

Utility model content

The first objective of the present utility model is to provide a lithium ion cell stacking device, which is simple in design, low in equipment cost, and high in stacking precision, and effectively improves the production efficiency and yield of lithium ion cells.

In order to achieve the above purpose, the utility model provides a lithium ion cell stacking device, the lithium ion cell stacking device includes a stacking module, a cutting module, a transportation module, a stacking and laminating module, and a hot pressing module. : In the stacking module, the positive electrode and negative electrode are arranged at intervals and hot-pressed on one side of the diaphragm to make a continuous stack, or the positive electrode is hot-pressed on one side of the diaphragm, and the negative electrode is hot-pressed on the diaphragm. The corresponding position on the other side of the unit is made into a continuous stack; the cutting module cuts the continuous stack into unit stacks; the transport module transports the unit stacks in a pipeline; the stack fit module cuts the unit stacks The stacking and the separator are in the form of stacks to obtain a neatly arranged multilayer stacked battery cell; the hot pressing module hot-presses the multilayer stacked battery core to obtain a lithium ion battery core.

Further, the cutting module includes a transmission mechanism and a die, the transmission mechanism carries and moves the continuous stack, and the die cuts the continuous stack on the transmission mechanism.

Further, the transport module includes an upper clamping track, a lower clamping track, an upper roller and a lower roller, and the unit stack is sandwiched between the upper clamping track and the lower clamping track, and the upper The roller drives the upper clamping track to move, and the lower roller drives the lower clamping track to move, thereby moving the unit stack.

Further, if the stacking module hot-presses the positive electrode sheet and the negative electrode sheet on one side of the separator, the unit stacks cut by the cutting module are divided into positive electrode unit stacks and negative electrode unit stacks, in order from bottom to top. , the positive electrode unit stack includes the separator and the positive electrode sheet, and the negative electrode unit stack includes the separator and the negative electrode sheet.

Further, if the stacking module hot-presses the positive electrode sheet on one side of the separator and hot-presses the negative electrode sheet on the other side of the separator, the unit stacks cut by the cutting module are from bottom to top. The sequence above includes the negative electrode sheet, the separator and the positive electrode sheet in turn.

Further, if the stacking module hot-presses the positive electrode sheet and the negative electrode sheet on one side of the separator, the stacking unit of the stacking and bonding module stacks the positive electrode unit and the negative electrode unit to stack. The forms are spaced to produce a neatly arranged multilayer stack.

Further, the lithium-ion cell stacking device further includes a transport mechanism, which transports the multi-layer stack in a streamlined manner, and a laminating unit of the stack laminating module attaches the diaphragm to the lamination unit. The upper surface of the multi-layer stack attached to the transport mechanism forms the multi-layer stack cell.

Further, if the stacking module hot-presses the positive electrode sheet on one side of the separator and hot-presses the negative electrode sheet on the other side of the separator, a bonding unit of the stacking bonding module will A membrane is attached to the upper surface of the unit stack on the transport module to form a new unit stack, and the transport module continues to transport the new unit stack in an inline manner.

Further, the stacking unit of the stacking and fitting module is arranged at the rear end of the transport module, and the new stack of units enters the stacking unit from the transport module in sequence, and the stacking unit will The new stacks of cells are arranged in a stack, resulting in a neatly aligned multilayer stack.

Further, the lithium-ion cell stacking device further includes a transport mechanism, which transports the multi-layer stack in a streamlined manner, and a laminating unit of the stack laminating module attaches the diaphragm to the lamination unit. The lower surface of the multi-layer stack coupled to the transport mechanism forms the multi-layer stack cell.

Compared with the prior art, the utility model provides a lithium ion battery cell stacking device, which can greatly reduce the design complexity, hardware investment, etc. The preparation efficiency and yield of the battery cell can be widely used in the production of lithium-ion battery cells.

Description of drawings

FIG. 1 is a schematic diagram of a stacking module of a lithium-ion cell stacking device in Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of a cutting module of the lithium-ion cell stacking device in Embodiment 1 of the present invention.

FIG. 3 is a schematic diagram of a transportation module of the lithium-ion cell stacking device in Embodiment 1 of the present invention.

4 is a schematic diagram of a stacking unit in a transport module and a stacking and laminating module of the lithium-ion cell stacking device in Embodiment 1 of the present invention.

FIG. 5 is a schematic diagram of a lamination unit of a stack lamination module of a lithium ion cell lamination device in Embodiment 1 of the present invention.

6 is a schematic diagram of a stacking module of a lithium-ion cell stacking device in Embodiment 2 of the present invention.

7 is a schematic diagram of a transport module and a lamination unit of a stack lamination module of the lithium-ion battery stacking device in Embodiment 2 of the present invention.

8 is a schematic diagram of a stacking unit in a transport module and a stacking and laminating module of the lithium-ion cell stacking device in Embodiment 2 of the present invention.

9 is a schematic diagram of a lamination unit of a stack lamination module of a lithium ion cell lamination device in Embodiment 2 of the present invention.

Detailed ways

The "ranges" disclosed herein are in the form of lower and upper limits. There can be one or more lower limits, and one or more upper limits, respectively. The given range is defined by choosing a lower limit and an upper limit. The selected lower and upper limits define the boundaries of the particular range. All ranges that can be defined in this manner are inclusive and combinable, ie, any lower limit can be combined with any upper limit to form a range. For example, ranges of 60-120 and 80-110 are listed for certain parameters, with the understanding that ranges of 60-110 and 80-120 are also contemplated. Additionally, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, the following ranges are all expected: 1-3, 1-4, 1-5, 2- 3, 2-4 and 2-5. In the present invention, unless otherwise specified, all the embodiments and preferred embodiments mentioned herein can be combined with each other to form new technical solutions.

In the present invention, unless otherwise specified, all the technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

In the present invention, unless otherwise specified, all the steps mentioned herein can be performed sequentially or randomly, but are preferably performed sequentially.

Example 1

The utility model provides a lithium ion cell stacking device, which comprises a stacking module, a cutting module 4, a transport module, a stacking and laminating module and a hot pressing module.

Specifically, in the stacking module, the positive electrode sheets 1 and the negative electrode sheets 3 are arranged at intervals and hot-pressed on one side of the separator 2 to form a continuous stack, as shown in FIG. 1 . Among them, the positive electrode sheet 1 and the negative electrode sheet 3 are hot-pressed on the diaphragm 2 by a hot-pressing process, the hot-pressing time is 1-100 minutes, the hot-pressing temperature is 60-200°C, and the hot-pressing pressure is 0.1-1000MPa; the diaphragm 2 is treated by surface coating process , The glues used for surface coating include polyvinylidene fluoride, polypropylene carbonate, polysiloxane, polyethylene oxide, polyphthalamide, polytrimethylene carbonate, polyvinyl carbonate and polycarbonate One or more of vinyl esters.

The cutting module 4 cuts the continuous stack into unit stacks. Specifically, the cutting module 4 includes a transmission mechanism 6 and a die 5 . The transmission mechanism 6 carries and moves the continuous stack, and the die 5 cuts the continuous stack on the transmission mechanism 6 . The unit stack is divided into a positive electrode unit stack 11 and a negative electrode unit stack 12 . From bottom to top, the positive unit stack 11 includes a separator 2 and a positive electrode sheet 1 , and the negative electrode unit stack 12 includes a separator 2 and a negative electrode sheet 3 .

The transport module is stacked in line-type transport units. The transport module includes an upper clamping crawler 8, a lower clamping crawler 9, an upper roller 7 and a lower roller 10. The unit stack is sandwiched between the upper clamping crawler 8 and the lower clamping crawler 9. The upper roller 7 drives the upper clamping track 8 to move, and the lower roller 10 drives the lower clamping track 9 to move. In this embodiment, the positive electrode unit stacks 11 and the negative electrode unit stacks 12 are arranged at intervals.

The stacking and laminating module is arranged at the end of the transport module, and the unit stacks enter the stacking and laminating module from the transporting module in turn. Arranged to obtain a neatly arranged multilayer stack 14, and then the multilayer stack 14 is transported in an assembly line by a transport mechanism, and then the laminating unit of the stack lamination module attaches a diaphragm 2 to the upper surface of the multilayer stack 14 The multi-layer stacked cell 15 is formed. The number of layers of the multi-layer stack 14 is determined according to the cell capacity design.

The hot-pressing module hot-presses the multi-layer stacked battery cells 15 to obtain a lithium-ion battery cell, wherein the hot-pressing time is 1-100 min, the hot-pressing temperature is 60-200° C., and the hot-pressing pressure is 0.1-1000 MPa.

Example 2

According to the method of Embodiment 1, a lithium-ion battery cell stacking device is provided, and only the differences are listed below:

In the stacking module, the positive electrode sheet 1 is hot-pressed on one side of the separator 2 and the negative electrode sheet 3 is hot-pressed on the corresponding position on the other side of the separator 2 to form a continuous stack, as shown in FIG. 6 . The cell stack 16 prepared by the cutting module 4 includes the negative electrode sheet 3 , the separator 2 and the positive electrode sheet 1 in order from bottom to top, as shown in FIG. 7 . In the stacking and bonding module, the separators 2 and the units are stacked in a stacked form and arranged at intervals, so as to prepare the multi-layer stacked battery cells 15 which are arranged in order. Specifically, first, as shown in FIG. 7 , the laminating unit of the stacking lamination module attaches a diaphragm 2 to the upper surface of the unit stack 16 on the transport module to form a new unit stack 17 , and the transport module continues the pipeline Shipping the new unit stack 17. Then, as shown in FIG. 8 , the stacking unit 13 of the stacking and fitting module is arranged at the rear end of the transport module, the unit stack 17 enters the stacking unit 13 from the transport module in turn, and the stacking unit 13 of the stacking and fitting module will The cell stacks 17 are arranged in a stack to produce a neatly aligned multilayer stack 18 . As shown in FIG. 9 , the multi-layer stack 18 is then transported in sequence by a pipeline, and then the laminating unit of the stacking and laminating module attaches a separator 2 to the lower surface of the multi-layer stack 18 to form a multi-layer stack cell. 15. The number of layers of the multi-layer stack 18 is determined according to the cell capacity design.

Compared with the prior art, the utility model provides a lithium ion cell stacking device, which replaces the cumbersome and complicated mechanical arm grabbing and roller control mechanism by the continuous stacking of positive and negative electrode sheets in a pipelined form. The pipeline-type production process realizes stacking, cutting, transmission, stacking, stacking, laminating, hot-pressing processes in turn, and efficiently and stably realizes the stacking process of lithium ion cells. High alignment accuracy; the lithium ion cell stacking equipment has high efficiency, simple mechanical mechanism, low equipment cost, high alignment accuracy of the produced lithium ion cell, flexible stacking of the cell, and effectively improves the preparation efficiency of the lithium ion cell. Yield rate, the equipment has a wide range of application prospects. The lithium-ion cell stacking equipment is applied to the stacking preparation process in the lithium-ion cell production process, and the lithium-ion cell can be used for consumer electronic products, vehicle power batteries, and the like.

The above disclosures are only the preferred embodiments of the present invention, of course, the scope of the rights of the present invention cannot be limited by this. Therefore, the equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention. .

Claims (10)

1. A lithium-ion battery cell stacking device, wherein the lithium-ion battery stacking device comprises: Stacking module, the stacking module arranges the positive electrode sheet and the negative electrode sheet at intervals and hot-presses it on one side of the separator to make a continuous stack, or hot-presses the positive electrode sheet on one side of the separator, and hot-presses the negative electrode sheet on the side of the separator. Corresponding positions on the other side of the diaphragm are made into a continuous stack; a cutting module that cuts the continuous stack into unit stacks; a transport module that in-line transports the stack of cells; a stacking and bonding module, the stacking and bonding module stacks the cells and the separators in a stacking form to produce a neatly arranged multilayer stacked battery cell; and A hot-pressing module, wherein the hot-pressing module hot-presses the multi-layer stacked battery cells to obtain a lithium-ion battery core. 2. The lithium-ion cell stacking device according to claim 1, wherein the cutting module comprises: a transport mechanism that carries and moves the continuous stack; and A knife die that slits the continuous stack on the transport mechanism. 3. The lithium-ion cell stacking device according to claim 1, wherein the transport module comprises: an upper clamping crawler and a lower clamping crawler, the unit stack being sandwiched between the upper clamping crawler and the lower clamping crawler; and An upper roller and a lower roller, the upper roller drives the upper clamping track to move, and the lower roller drives the lower clamping track to move, thereby moving the unit stack. 4. The lithium-ion cell stacking device according to claim 1, wherein if the stacking module hot-presses the positive electrode sheet and the negative electrode sheet on one side of the separator, the cutting module cuts the The unit stack is divided into a positive electrode unit stack and a negative electrode unit stack, in order from bottom to top, the positive electrode unit stack includes the separator and the positive electrode sheet, and the negative electrode unit stack includes the separator and the negative electrode sheet. 5 . The lithium-ion cell stacking device according to claim 1 , wherein, if the stacking module hot-presses the positive electrode sheet on one side of the separator, and hot-presses the negative electrode sheet on the side of the separator. 6 . On the other side, the unit stack cut by the cutting module sequentially includes a negative electrode sheet, a separator and a positive electrode sheet in order from bottom to top. 6 . The lithium-ion cell stacking device according to claim 4 , wherein if the stacking module hot-presses the positive electrode sheet and the negative electrode sheet on one side of the separator, the stacking and bonding module will The stacking unit arranges the positive electrode unit stacks and the negative electrode unit stacks at intervals in a stack form to prepare a neatly arranged multilayer stack. 7 . The lithium-ion battery stacking device according to claim 6 , wherein the lithium-ion battery stacking device further comprises a transport mechanism, and the transport mechanism performs pipeline transportation of the multi-layer stack. 8 . , a laminating unit of the stacking lamination module attaches the diaphragm to the upper surface of the multi-layer stack on the transport mechanism to form the multi-layer stack cell. 8 . The lithium-ion cell stacking device according to claim 5 , wherein, if the stacking module hot-presses the positive electrode sheet on one side of the separator, and hot-presses the negative electrode sheet on the side of the separator. 9 . On the other side, a laminating unit of the stacking lamination module attaches a diaphragm to the upper surface of the unit stack on the transport module to form a new unit stack, and the transport module continues the pipeline Transport the new stack of units. 9 . The lithium-ion battery stacking device according to claim 8 , wherein the stacking unit of the stacking and bonding module is arranged at the rear end of the transport module, and the new units are stacked in sequence. 10 . The stacking unit enters the stacking unit from the transport module, and the stacking unit arranges the new stack of units in a stack to produce a neatly arranged multi-layer stack. 10 . The lithium-ion battery stacking device according to claim 9 , wherein the lithium-ion battery stacking device further comprises a transportation mechanism, and the transportation mechanism carries out the pipeline transportation of the multi-layer stack. 11 . , a laminating unit of the stack laminating module attaches the diaphragm to the lower surface of the multi-layer stack on the transport mechanism to form the multi-layer stack cell.

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