WO2020259693A1

WO2020259693A1 - Lamination method used for battery cell fabrication and battery cell electrode group fabrication device

Info

Publication number: WO2020259693A1
Application number: PCT/CN2020/098589
Authority: WO
Inventors: 徐春龙; 滕立杰; 郑赫; 赵凯; 金正贤; 金省周; 王辉; 王洋
Original assignee: 蜂巢能源科技有限公司
Priority date: 2019-06-28
Filing date: 2020-06-28
Publication date: 2020-12-30
Also published as: CN110277590B; CN110277590A

Abstract

A lamination method used for battery cell fabrication and a battery cell electrode group fabrication device (100), the lamination method comprising: arranging a first separator (221) and a second separator (222) opposite to each other; and inserting positive electrode pieces (231) one by one between the first separator (221) and the second separator (222), and alternatingly disposing negative electrode pieces (232) on a side of the first separator (221) away from the second separator (222) and on a side of the second separator (222) away from the first separator (221).

Description

Lamination method for cell manufacturing and cell pole group manufacturing equipment

Cross references to related applications

This application requires the Chinese patent application number "201910578756.7" submitted by "Honeycomb Energy Technology Co., Ltd." on June 28, 2019, entitled "Lamination method for cell manufacturing and cell pole assembly manufacturing equipment" priority.

Technical field

This application relates to the field of vehicle manufacturing, in particular, to a lamination method for battery cell manufacturing and battery cell electrode assembly manufacturing equipment.

Background technique

In related technologies, with the development of new energy machinery such as new energy vehicles, the application of batteries has become more and more extensive. In the field of lithium batteries and other batteries, the z-shaped lamination technology is usually used when manufacturing the electrode assembly of the battery. That is, when lamination, the negative electrode sheet is first laminated, and then the negative electrode sheet is covered with a separator, and then the positive electrode sheet is laminated. Wrap the separator around the positive electrode. The lamination unit of the lamination method is a single pole piece or a single diaphragm, and the speed of using this lamination method is relatively slow, resulting in low efficiency of cell manufacturing.

Application content

In view of this, the purpose of this application is to propose a lamination method that can at least improve the manufacturing efficiency of the cell electrode group to a certain extent.

In order to achieve the above purpose, the technical solution of this application is realized as follows:

A stacking method includes installing a positive electrode sheet, a negative electrode sheet, a first separator, and a second separator into a laminated unit, and folding a plurality of the laminated units to form a set of cell electrode groups, wherein The installation of the positive electrode sheet, the negative electrode sheet, the first diaphragm and the second diaphragm into a laminated unit includes: arranging the first diaphragm and the second diaphragm opposite to each other, and inserting the positive electrode sheets into the first diaphragm and the second diaphragm one by one And staggered on the side of the first diaphragm away from the second diaphragm and on the side of the second diaphragm away from the first diaphragm.

In some examples of the present application, the installing the positive electrode sheet, the negative electrode sheet, the first separator, and the second separator into a laminated unit further includes: connecting the first separator, the second separator, and the positive electrode sheet. , The step of fixing the negative electrode sheet.

In some examples of the present application, the folding a plurality of the laminated units to form a set of battery cell pole groups includes: setting a pre-folded position between two adjacent laminated units. Trace the steps.

In some examples of the present application, the folding a plurality of the lamination units into a set of battery cell pole groups further includes: folding and clamping the plurality of the lamination units through the pre-folds The steps of forming a set of cell poles.

In some examples of the present application, the folding a plurality of the lamination units to form a set of cell pole groups further includes: arranging the first cell between two adjacent groups of the cell pole groups A step of cutting a diaphragm and the second diaphragm.

In some examples of the present application, the folding a plurality of the lamination units to form a set of battery cell pole groups further includes: performing diaphragm tail winding and glueing the cut out of the battery cell pole group A step of.

Compared with the prior art, the lamination method described in this application has the following advantages:

1) According to the lamination method of the present application, two diaphragms can be laminated at the same time, which shortens the manufacturing time of the cell pole group, improves the manufacturing efficiency of the cell pole group, and thereby improves the cell manufacturing efficiency.

Another purpose of this application is to provide a battery cell electrode assembly manufacturing equipment, including: a positive electrode plate conveying device, a first negative electrode plate conveying device, a second negative electrode plate conveying device, a first diaphragm conveying device, and a second diaphragm A conveying device, the first diaphragm conveying device and the second diaphragm conveying device are arranged oppositely, the positive electrode plate conveying device is sandwiched between the first diaphragm conveying device and the second diaphragm conveying device, so The first negative electrode plate conveying device is located on the side of the first diaphragm conveying device away from the second diaphragm conveying device, and the second negative electrode plate conveying device is located on the second diaphragm conveying device away from the first One side of the diaphragm conveying device, the first negative electrode plate conveying device and the second negative electrode plate conveying device are used to alternately be on the side of the first diaphragm facing away from the second diaphragm and on the second diaphragm. A negative electrode sheet is arranged on the side of the diaphragm away from the first diaphragm.

In some examples of the present application, the first diaphragm conveying device and the second diaphragm conveying device both include: a diaphragm unwinding roller, and the positive electrode plate conveying device includes: a positive electrode plate unwinding roller and a positive electrode plate A cutting piece, the positive electrode plate cutting piece is used to cut the positive electrode sheet into the positive electrode sheet before the positive electrode sheet discharged from the positive electrode sheet is unrolled and rolled into the first separator and the second separator , Each of the first negative electrode plate conveying device and the second negative electrode plate conveying device includes: a negative plate material unwinding roller and a negative electrode plate cutting piece, and the negative plate material cutting piece is used for Cutting the negative electrode sheet discharged from the negative electrode sheet into the negative electrode sheet.

In some examples of the present application, the cell electrode assembly manufacturing equipment further includes: a thermal lamination mechanism, the thermal lamination mechanism includes: two pressure rollers and a heating part, the two pressure rollers are suitable for jointly The first separator, the second separator, the positive electrode sheet, and the negative electrode sheet are compressed, and the heating part is adapted to heat the first separator and the second separator to heat the first separator The separator, the second separator, the positive electrode sheet, and the negative electrode sheet are thermally bonded and fixed.

In some examples of the present application, the cell electrode assembly manufacturing equipment further includes: a device for pre-folding the first diaphragm and the second diaphragm at a position between two adjacent lamination units. The pre-crease mechanism includes a plurality of crease members, and the plurality of crease members are alternately arranged on the side of the first diaphragm facing away from the second diaphragm and on the second diaphragm. The side of the diaphragm facing away from the first diaphragm.

Compared with the prior art, the battery cell electrode assembly manufacturing equipment described in this application has the following advantages:

1) According to the battery cell electrode group manufacturing equipment of the present application, two diaphragms can be laminated at the same time, which shortens the manufacturing time of the battery cell electrode group, improves the manufacturing efficiency of the battery cell electrode group, and thereby improves the battery cell manufacturing efficiency .

The additional aspects and advantages of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

FIG. 1 is a schematic diagram of using the cell electrode assembly manufacturing equipment according to an embodiment of the present application for lamination;

FIG. 2 is a schematic diagram of the structure of multiple lamination units according to an embodiment of the application.

Detailed ways

It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict.

Hereinafter, the present application will be described in detail with reference to the drawings and in conjunction with embodiments.

The following describes the lamination method of the embodiment of the present application with reference to FIGS. 1 to 2 in conjunction with the embodiments.

As shown in FIGS. 1-2, the lamination method may include installing the positive electrode sheet 231, the negative electrode sheet 232, the first separator 221, and the second separator 222 into a laminated unit 210, and folding and fabricating a plurality of laminated units 210 A battery cell pole group 200 is formed, in which the positive electrode sheet 231, the negative electrode sheet 232, the first diaphragm 221 and the second diaphragm 222 are assembled into the laminated unit 210, including: the first diaphragm 221 and the second diaphragm 222 are arranged oppositely , Insert the positive electrode sheets 231 one by one between the first separator 221 and the second separator 222, and arrange the negative electrode on the side of the first separator 221 away from the second separator 222 and the side of the second separator 222 away from the first separator 221. Sheet 232, that is, after a negative electrode sheet 232 opposite to a positive electrode sheet 231 is arranged on the side of the first separator 221 away from the second separator 222, at the adjacent positive electrode sheet 231, the second separator 222 faces away from the first separator 221 A negative plate 232 is provided on one side of the battery. Therefore, the lamination method of the present application can simultaneously laminate two diaphragms, and simultaneously fold the lamination unit 210 at a time in the subsequent steps. The multiple of each pole group shortens the manufacturing time of the cell pole group 200, The manufacturing efficiency of the battery cell pole group 200 is improved, thereby improving the manufacturing efficiency of the battery cell.

Specifically, as shown in FIG. 1, the positive electrode sheet 231, the negative electrode sheet 232, the first separator 221, and the second separator 222 are assembled into the laminated unit 210, which further includes: the first separator 221, the second separator 222, and the positive electrode sheet. 231. The negative electrode plate 232 performs a fixing step. This can facilitate subsequent folding of the laminated unit 210 as a whole to form the cell pole group 200.

Specifically, as shown in FIGS. 1-2, folding a plurality of lamination units 210 into a set of cell pole groups 200 includes: arranging a preset position between two adjacent lamination units 210 Crease 240 steps. Therefore, the subsequent two lamination units 210 can be laminated through the pre-fold 240 to form the cell pole group 200, and the manufacture of the cell pole group 200 is accurate and convenient.

Specifically, as shown in FIG. 1, folding a plurality of lamination units 210 into a set of battery cell pole groups 200 also includes: folding and clamping the plurality of lamination units 210 through a pre-fold 240 to form a set of battery cells. Steps of the core group 200 (for example, clamping by the clamping robot 6). Therefore, the space occupied by the cell pole group 200 can be reduced.

For example, the clamping robot 6 can clamp multiple lamination units 210 to compress the multiple lamination units 210 close to each other, and fold them along the pre-fold 240, so that multiple lamination units 210 can be folded at a time. Improve stacking efficiency.

Specifically, as shown in FIG. 1, folding a plurality of lamination units 210 into a set of cell pole groups 200 further includes: arranging a first diaphragm 221 and a first diaphragm 221 between adjacent two sets of cell pole groups 200 In the step of cutting the second diaphragm 222, for example, the first diaphragm 221 and the second diaphragm 222 can be cut by a tool such as a blade to form a single set of battery cells.

Specifically, as shown in FIG. 1, folding a plurality of lamination units 210 into a set of cell pole groups 200 also includes the steps of performing diaphragm tail winding and glueing on the cut cell pole groups 200 . That is, the remaining first diaphragm 221 and the second diaphragm 222 that are cut on each group of cell pole groups 200 are wound around the outside of the group of cell pole groups 200, and each group of cell pole groups 200 are attached by gluing or the like. The cut remaining first diaphragm 221 and second diaphragm 222 are fixed on the outside of the cell pole group 200, so that the cell pole group 200 occupies a small space, and the diaphragm wound on the outside of the cell pole group 200 can be The lamination unit 210 inside the battery cell pole group 200 is protected.

The following describes the cell electrode assembly manufacturing equipment 100 of the embodiment of the present application.

As shown in FIG. 1, the cell electrode assembly manufacturing equipment 100 of the embodiment of the present application includes: a positive electrode plate conveying device for conveying a positive electrode plate 231 1, a first negative electrode plate conveying device for conveying a negative electrode plate 232 21 and the second negative electrode plate conveying device 22, the first diaphragm conveying device 31 for conveying the first diaphragm 221, the second diaphragm conveying device 32 for conveying the second diaphragm 222, the first diaphragm conveying device 31 and the second separator The separator conveying device 32 is arranged oppositely, and the positive electrode plate conveying device 1 is sandwiched between the first separator conveying device 31 and the second separator conveying device 32, so that the positive electrode plate 231 can be inserted between the first separator 221 and the second separator 222. Meanwhile, the first negative electrode plate conveying device 21 is located on the side of the first diaphragm conveying device 31 away from the second diaphragm conveying device 32, and the second negative electrode plate conveying device 22 is located on the second diaphragm conveying device 32 away from the first diaphragm conveying device 31. The first negative electrode plate conveying device 21 and the second negative electrode plate conveying device 22 are used to stagger the side of the first diaphragm 221 away from the second diaphragm 222 and the side of the second diaphragm 222 away from the first diaphragm 221. A negative plate 232 is provided on the side.

According to the cell pole group manufacturing equipment 100 of the embodiment of the present application, two diaphragms can be laminated at the same time, and the laminated unit 210 can be subsequently folded at a time. The multiple of each pole group shortens the cell pole group 200 The manufacturing time is improved, and the manufacturing efficiency of the cell pole group 200 is improved, thereby improving the manufacturing efficiency of the cell.

Specifically, as shown in FIG. 1, the first diaphragm conveying device 31 and the second diaphragm conveying device 32 both include: a diaphragm unwinding drum 30 for winding and unwinding a diaphragm, and the positive electrode plate conveying device 1 includes: a positive plate material unwinding The drum 11 and the positive electrode plate cutting piece, the positive electrode plate cutting piece (such as a blade) is used to cut the positive electrode plate discharged from the positive electrode plate into the first separator 221 and the second separator 222 before cutting into Each of the positive electrode sheet 231, the first negative electrode plate conveying device 21 and the second negative electrode plate conveying device 22 includes: a negative plate material unwinding drum 20 and a negative electrode plate cutting piece (such as a blade), and a negative electrode plate The cutting piece is used to cut the negative electrode sheet discharged from the negative electrode sheet into a negative electrode sheet 232. Therefore, there is no need to arrange mechanical claws to clamp and transport the positive electrode sheet 231 or the negative electrode sheet 232, and the lamination unit 210 can be installed, which saves the occupied space of the cell electrode assembly manufacturing equipment 100 and reduces the manufacturing cost.

Specifically, as shown in FIG. 1, the cell electrode assembly manufacturing equipment 100 further includes: a thermal cladding mechanism 4, the thermal cladding mechanism 4 includes: two pressing rollers 41 and a heating part, the two pressing rollers 41 are suitable for jointly The first separator 221, the second separator 222, the positive electrode sheet 231, and the negative electrode sheet 232 are compressed, and the heating part is adapted to heat the first separator 221 and the second separator 222, so that the surface of the first separator 221 and the second separator 222 increases in viscosity. Large, to thermally bond and fix the first separator 221, the second separator 222, the positive electrode sheet 231, and the negative electrode sheet 232. In this way, it can be ensured that the various components of the laminated monomer are firmly connected. Specifically, the heating part may be an electric heating wire, and the electric heating wire may be wound or fixed on at least one pressing roller 41.

Specifically, as shown in FIG. 1, the cell electrode group manufacturing equipment 100 further includes: a first diaphragm 221 and a second diaphragm 222 for setting a pre-crease at a position between two adjacent laminated units 210 240 pre-crease mechanism 5, the pre-crease mechanism 5 includes a plurality of crease members 51, the plurality of crease members 51 are alternately arranged on the side of the first diaphragm 221 away from the second diaphragm 222 and on the second diaphragm 222 away from the first One side of the diaphragm 221. In this way, the force on both sides of the first diaphragm 221 and the second diaphragm 222 during the pre-folding 240 can be uniform. The crease member 51 may be a cylindrical steel body (for example, an iron block) without a pointed end.

The above are only preferred embodiments of this application, and are not intended to limit this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application within.

Claims

A lamination method for battery cell manufacturing, characterized in that it comprises: installing a positive electrode sheet, a negative electrode sheet, a first separator and a second separator into a laminated unit, and folding and manufacturing a plurality of the laminated units Into a group of cell pole groups;

Wherein, the assembling the positive electrode sheet, the negative electrode sheet, the first diaphragm and the second diaphragm into a laminated unit includes: arranging the first diaphragm and the second diaphragm opposite to each other, and inserting the positive electrode sheets into the first diaphragm and the second diaphragm one by one. Between the second diaphragms, negative electrodes are arranged alternately on the side of the first diaphragm facing away from the second diaphragm and on the side of the second diaphragm facing away from the first diaphragm.
The lamination method for battery cell manufacturing according to claim 1, wherein the mounting the positive electrode sheet, the negative electrode sheet, the first separator, and the second separator into a laminated unit further comprises: A step of fixing a diaphragm, the second diaphragm, the positive electrode sheet, and the negative electrode sheet.
The lamination method for cell manufacturing according to claim 1 or 2, wherein the folding a plurality of the lamination units to form a set of cell pole groups includes: combining adjacent A step of arranging a pre-crease at a position between the two lamination units.
The lamination method for battery cell manufacturing according to claim 3, wherein said folding a plurality of said lamination units into a set of battery cell pole groups further comprises: The step of folding and clamping the laminated unit into a group of cell pole groups through the pre-fold.
The lamination method for battery cell manufacturing according to claim 4, wherein said folding a plurality of said lamination units to form a set of battery cell pole groups further comprises: arranging two adjacent The step of cutting the first diaphragm and the second diaphragm between the cell electrode groups.
The lamination method for cell manufacturing according to claim 5, wherein said folding a plurality of said lamination units to form a set of cell pole groups further comprises: cutting all the cells The steps of carrying out the diaphragm tail winding and applying glue to the cell electrode group are described.
A battery cell electrode assembly manufacturing equipment, which is characterized by comprising: a positive electrode plate conveying device, a first negative electrode plate conveying device, a second negative electrode plate conveying device, a first diaphragm conveying device, and a second diaphragm conveying device. The first diaphragm conveying device and the second diaphragm conveying device are arranged oppositely, the positive electrode plate conveying device is sandwiched between the first diaphragm conveying device and the second diaphragm conveying device, and the first negative electrode The electrode plate conveying device is located on the side of the first diaphragm conveying device away from the second diaphragm conveying device, and the second negative electrode plate conveying device is located on the side of the second diaphragm conveying device away from the first diaphragm conveying device. On one side, the first negative electrode plate conveying device and the second negative electrode plate conveying device are used to alternate on the side of the first diaphragm facing away from the second diaphragm and when the second diaphragm facing away from the A negative electrode sheet is provided on one side of the first separator.
7. The cell electrode assembly manufacturing equipment according to claim 7, wherein the first diaphragm conveying device and the second diaphragm conveying device both comprise: a diaphragm unwinding roller, and the positive electrode plate conveying device comprises: A positive electrode sheet material unwinding roller and a positive electrode sheet cutting part, the positive electrode sheet material cutting part is used to feed the positive electrode sheet discharged from the positive electrode sheet material into the first separator and the second separator Before cutting into the positive electrode sheet, each of the first negative electrode plate conveying device and the second negative electrode plate conveying device includes: a negative electrode sheet material unwinding roller and a negative electrode sheet material cutting piece The negative electrode sheet cutting member is used to cut the negative electrode sheet discharged from the negative electrode sheet into the negative electrode sheet.
The battery cell electrode assembly manufacturing equipment according to claim 7 or 8, further comprising: a thermal cladding mechanism, the thermal cladding mechanism comprising: two pressing rollers and a heating part, the two pressing rollers Is suitable for compressing the first diaphragm, the second diaphragm, the positive electrode sheet, and the negative electrode sheet together, and the heating part is suitable for heating the first diaphragm and the second diaphragm to heat The first separator, the second separator, the positive electrode sheet, and the negative electrode sheet are thermally bonded and fixed.
The battery cell electrode assembly manufacturing equipment according to any one of claims 7-9, further comprising: two adjacent lamination units for positioning the first diaphragm and the second diaphragm A pre-crease pre-crease mechanism is provided at a position in between, the pre-crease mechanism includes a plurality of crease members, and a plurality of the crease members are staggeredly arranged on the first diaphragm away from the second diaphragm On one side and on the side of the second diaphragm facing away from the first diaphragm.