CN112768787A - Battery cell winding equipment and preparation method of battery cell - Google Patents

Abstract

The invention relates to a battery cell winding device and a preparation method of a battery cell, wherein the battery cell winding device comprises a first discharging device, a second discharging device and a winding device, the first discharging device is used for outputting a first composite pole piece, the first composite pole piece is a composite piece which is formed into an integral structure by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression, the second discharging device is used for outputting a second composite pole piece, the second composite pole piece is a composite piece which is formed into an integral structure by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot compression, the winding device is arranged at the downstream of the first discharging device and the second discharging device, and the winding device is used for winding the first composite pole piece and the second composite pole piece to manufacture the battery cell. The blanking belt path of the battery cell winding equipment is reduced, so that the use number of parts is reduced, the integral structure of the equipment is simplified, and meanwhile, the winding work efficiency is improved.

Description

Battery cell winding equipment and preparation method of battery cell

Technical Field

The invention relates to the technical field of lithium ion battery production, in particular to a battery cell winding device and a preparation method of a battery cell.

Background

With the continuous development of science and technology, new energy automobiles are increasingly widely used as environmentally friendly vehicles. The power source of the new energy automobile is mainly a power battery. In power battery processing equipment, a winding machine winds a battery core forming a power battery, so that the winding machine becomes an important equipment for producing the power battery.

However, in the preparation of the lithium battery in the related art, the winding machine basically adopts the positive plate, the separator, the negative plate and the separator to be wound on the winding needle at the same time, that is, the cell winding is wound into the cell by 4 tape paths (respectively, the separator, the positive plate, the separator and the negative plate are combined), and 4 layers of materials are added for each winding of the winding needle. The winding machine of the type has more discharging belt paths, so that more auxiliary mechanisms (such as a deviation correcting mechanism, a winding auxiliary mechanism and the like) are required to assist the positive plate, the negative plate and the diaphragm to smoothly wind, the equipment structure of the winding machine is complicated, and the improvement of the working efficiency of the winding machine is limited.

Disclosure of Invention

The invention aims to provide a battery cell winding device and a battery cell manufacturing method, which are high in working efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

provided is a cell winding apparatus including:

the first discharging device is used for outputting a first composite pole piece, and the first composite pole piece is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression;

the second discharging device is used for outputting a second composite pole piece, and the second composite pole piece is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot compression;

and the winding device is arranged at the downstream of the first discharging device and the second discharging device and is used for winding the first composite pole piece and the second composite pole piece to manufacture the battery cell.

Furthermore, the first discharging device and the second discharging device are symmetrically arranged on two sides of the winding device.

Further, the winding device comprises a winding needle, and the winding device rotates through the winding needle to wind the first composite pole piece and the second composite pole piece.

Furthermore, the winding device comprises a first winding guide roller group and a second winding guide roller group, the first winding guide roller group and the second winding guide roller group are arranged at the upstream of the winding needle, the first winding guide roller group is used for conveying the first composite pole piece to the winding needle, and the second winding guide roller group is used for conveying the second composite pole piece to the winding needle.

Furthermore, the first roll-in guide roller group and the second roll-in guide roller group are symmetrically arranged on two sides of the winding needle.

Further, the cell winding equipment comprises a first sensor, a second sensor, a prompting device and a control device, wherein the control device is electrically connected with the first sensor, the second sensor, the prompting device and the control device;

the first sensor is arranged on the first emptying device, the second sensor is arranged on the second emptying device, the first sensor is used for detecting the material condition of the first emptying device, the second sensor is used for detecting the material condition of the second emptying device, and the control device is used for controlling the working state of the prompting device according to the detection result of the first sensor and/or the second sensor.

Further, the battery core winding equipment comprises a first composite pole piece cutter mechanism and a second composite pole piece cutter mechanism, the first composite pole piece cutter mechanism is arranged at the downstream of the first discharging device, the first composite pole piece cutter mechanism is located between the first discharging device and the winding device, the second composite pole piece cutter mechanism is arranged at the downstream of the second discharging device, the second composite pole piece cutter mechanism is located between the second discharging device and the winding device, the first composite pole piece cutter mechanism is used for cutting off the first composite pole piece, and the second composite pole piece cutter mechanism is used for cutting off the second composite pole piece.

Further, the cell winding equipment comprises a first tension adjusting mechanism and a second tension adjusting mechanism, the first tension adjusting mechanism is arranged between the first discharging device and the winding device, the second tension adjusting mechanism is arranged between the second discharging device and the winding device, the first tension adjusting mechanism is used for adjusting the tension of the first composite pole piece, and the second tension adjusting mechanism is used for adjusting the tension of the second composite pole piece.

Further, the cell winding device comprises a clamping mechanism, the clamping mechanism is arranged at the upstream of the winding device, the clamping mechanism is located between the first discharging device and the winding device, the clamping mechanism is located between the second discharging device and the winding device, and the clamping mechanism is used for clamping the first composite pole piece and the second composite pole piece.

There is also provided a cell winding apparatus including:

the first discharging device is used for outputting a first composite pole piece, and the first composite pole piece is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression;

the second discharging device is used for outputting a second composite pole piece, and the second composite pole piece is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot compression;

the third discharging device is used for outputting a third composite pole piece, and the third composite pole piece is a composite piece of an integrated structure formed by a fifth diaphragm, a third positive pole piece, a sixth diaphragm and a third negative pole piece through hot compression;

and the winding device is arranged at the downstream of the first discharging device, the second discharging device and the third discharging device and is used for winding the first composite pole piece, the second composite pole piece and the third composite pole piece to manufacture a battery cell.

The preparation method of the battery cell comprises the following steps:

providing a first composite pole piece, wherein the first composite pole piece is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression;

providing a second composite pole piece, wherein the second composite pole piece is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination;

and winding the first composite pole piece and the second composite pole piece to manufacture the battery core.

Compared with the prior art, the invention has the beneficial effects that:

according to the cell winding equipment and the cell manufacturing method, the first discharging device outputs the first composite pole piece, the second discharging device outputs the second composite pole piece, the third discharging device outputs the third composite pole piece, and the first composite pole piece, the second composite pole piece and the third composite pole piece are respectively conveyed to the winding station of the winding device to complete the winding work. Compared with the processing mode that the positive plate, the diaphragm, the negative plate and the diaphragm independently enter the winding process, the blanking belt path of the battery cell winding equipment is reduced, so that the use number of parts is reduced, the overall structure of the equipment is simplified, and meanwhile, the winding work efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of a cell winding apparatus according to an embodiment of the present invention;

fig. 2 is another schematic structural diagram of a cell winding apparatus according to an embodiment of the present invention;

fig. 3 is a schematic view of another structure of a cell winding apparatus according to an embodiment of the present invention;

fig. 4 is a block diagram of a cell winding apparatus according to an embodiment of the present invention;

fig. 5 is another block diagram of a cell winding apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another cell winding apparatus according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of another cell winding apparatus according to an embodiment of the present invention.

In the figure:

100. battery cell winding equipment;

101. a first composite pole piece; 102. a second composite pole piece;

10. a first discharging device; 20. a second discharging device; 30. a winding device; 32. a first roll-in guide roller set; 34. a second reeling guide roller set; 40. a detection device; 50. a deviation correcting device; 60. a control device; 71. a first sensor; 72. a second sensor; 73. a prompting device; 80. a first composite pole piece cutter mechanism; 81. a second composite pole piece cutter mechanism; 90. a first tension adjustment mechanism; 91. a second tension adjustment mechanism; 92. a clamping mechanism; 921. a first pinch roller; 922. a second pinch roller;

200. battery cell winding equipment;

101a, a first composite pole piece; 102a and a second composite pole piece; 103a, a third composite pole piece; 210. a first discharging device; 220. a second discharging device 221 and a third discharging device; 230. a winding device;

300. battery cell winding equipment;

101b, a first composite pole piece; 102b, a second composite pole piece; 103b, a third composite pole piece; 104b, a fourth composite pole piece; 310. a first discharging device; 320. a second discharging device; 321. a third discharging device; 322. a fourth discharging device; 330. and (4) a winding device.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

Referring to fig. 1 to fig. 5, a first method for manufacturing a battery cell according to the present invention can be applied to the first battery cell winding apparatus 100. The preparation method of the battery cell comprises the following steps:

providing a first composite pole piece 101, wherein the first composite pole piece 101 is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot lamination;

providing a second composite pole piece 102, wherein the second composite pole piece 102 is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination;

and winding the first composite pole piece 101 and the second composite pole piece 102 to manufacture a battery core.

In the first composite pole piece 101, the first separator, the first negative pole piece, the second separator and the first positive pole piece are sequentially stacked; in the second composite pole piece 102, the third diaphragm, the second negative pole piece, the fourth diaphragm and the second positive pole piece are sequentially stacked. The possibility of the problems of folding the pole piece, winding dust and the like can be effectively reduced by adopting the winding mode of the composite pole piece.

The above-described first cell manufacturing method can be implemented by the cell winding apparatus 100. The cell winding device 100 includes a first discharging device 10, a second discharging device 20, and a winding device 30. The first discharging device 10 is used for outputting a first composite pole piece 101. The first composite pole piece 101 is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot lamination. The second discharging device 20 is used for outputting a second composite pole piece 102. The second composite pole piece 102 is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination. The winding device 30 is disposed downstream of the first discharging device 10 and the second discharging device 20. The winding device 30 is used for winding the first composite pole piece 101 and the second composite pole piece 102 to manufacture a battery core.

In summary, in the first battery cell winding apparatus 100 according to the embodiment of the present invention, the first discharging device 10 outputs the first composite pole piece 101, the second discharging device 20 outputs the second composite pole piece 102, and then the first composite pole piece 101 and the second composite pole piece 102 are respectively conveyed to the winding station of the winding device 30 to complete the winding operation. In this way, compared with a processing mode that the positive plate, the diaphragm, the negative plate and the diaphragm independently enter the winding process, the blanking belt path of the first battery cell winding device 100 according to the embodiment of the present invention is reduced, which is beneficial to reducing the number of parts used, simplifying the overall structure of the device, and simultaneously, improving the winding work efficiency.

In addition, the battery cell winding device 100 of the embodiment of the invention not only effectively reduces the total number of sheets entering the winding process, thereby reducing the alignment difficulty, improving the winding precision, but also effectively reducing the possibility of problems such as pole piece folding and winding dust, and further improving the yield and production efficiency of the battery cell. In addition, 8 layers of materials (each composite pole piece includes a negative pole piece, a positive pole piece, and two layers of diaphragms, that is, 4 layers of materials) can be added to each winding device 30 of the battery cell winding device 100 according to the embodiment of the present invention, so that the working efficiency of the battery cell winding device is improved.

It is understood that a buffering device (not shown) may be provided between the discharging device (including the first discharging device and the second discharging device) and the winding device 30. The buffer device can be used for buffering the composite pole pieces discharged by the composite discharging device.

In certain embodiments, the method of preparing the first cell comprises:

detecting the alignment degree between the first composite pole piece 101 and the second composite pole piece 102, determining whether the alignment degree between the first composite pole piece 101 and the second composite pole piece 102 meets a preset value, and adjusting the relative position between the first composite pole piece 101 and the second composite pole piece 102 under the condition that the alignment degree between the first composite pole piece 101 and the second composite pole piece 102 does not meet the preset value.

This can improve the winding accuracy. It should be noted that the preset value can be set according to specific situations. In some examples, when the alignment degree between the first composite pole piece 101 and the second composite pole piece 102 is smaller than a preset value, the relative position between the first composite pole piece 101 and the second composite pole piece 102 is adjusted.

In the example shown in fig. 4, the cell winding apparatus 100 includes a detection device 40, a deviation correction device 50, and a control device 60. The control device 60 is connected to the detecting device 40 and the deviation rectifying device 50. The detection device 40 is used for detecting the alignment degree between the first composite pole piece 101 and the second composite pole piece 102. The control device 60 is configured to control the deviation rectification device 50 to adjust the relative position between the first composite pole piece 101 and the second composite pole piece 102 under the condition that the alignment degree between the first composite pole piece 101 and the second composite pole piece 102 does not satisfy a preset value.

It will be appreciated that the detection device 40 may be arranged downstream of the winding device 30. The deviation rectifying device 50 may be disposed upstream of the winding device 30.

It should be noted that the detecting device 40 may include a sensor, and the deviation rectifying device may include one or more deviation rectifying rollers.

In certain embodiments, the method of preparing the first cell comprises:

after the first composite pole piece 101 and the second composite pole piece 102 are wound, the wound battery core is rubberized and subjected to blanking.

In the present embodiment, the first cell winding apparatus 100 includes a taping mechanism (not shown) and a blanking mechanism (not shown). After the winding device 30 finishes winding the first composite pole piece 101 and the second composite pole piece 102, the rubberizing mechanism rubberizes the wound battery cell, and the blanking mechanism blanks the rubberized battery cell.

In certain embodiments, the method for preparing the first cell further comprises:

detecting the material condition of the first emptying device 10 and detecting the material condition of the second emptying device 20;

whether prompt information is sent is determined according to the detection result of the material condition of the first emptying device 10 and/or the detection result of the material condition of the second emptying device 20.

For example, in some examples, when the material of the first emptying device 10 runs out (the first composite pole piece 101 runs out), a prompt message (which may be a sound alarm message) is sent out. In some examples, when the material of the second emptying device 10 is used up (the second composite pole piece 102 is used up), a prompt message (which may be a sound alarm message) is sent out. In some examples, when the material amount of any one of the first emptying device 10 and the second emptying device 20 is used up or is lower than a preset value, a prompt message (which may be a sound alarm message) is sent. In other examples, when the material amount of the first emptying device 10 and the material amount of the second emptying device 20 are both lower than a preset value, a prompt message (which may be a sound alarm message) is sent.

In the example illustrated in fig. 5, the cell winding apparatus 100 includes a first sensor 71, a second sensor 72, a prompting device 73 (which may be an audible alarm), and a control device 60. The control device 60 is electrically connected to the first sensor 71, the second sensor 72, the prompting device 73 and the control device 60. The first sensor 71 is disposed on the first discharging device 10. The second sensor 72 is disposed on the second discharging device 20. The first sensor 71 is used for detecting the material condition of the first emptying device 10. The second sensor 72 is used for detecting the material condition of the second emptying device 20. The control device 60 is configured to control the operating state of the prompting device 73 according to the detection result of the first sensor 71 and/or the second sensor 72. The above material condition may be the material amount of the composite pole piece.

The cell winding apparatus 100 according to the embodiment of the present invention will be further described below.

In certain embodiments, the winding device 30 includes a winding needle. The winding device 30 is rotated by a winding needle to wind the first composite pole piece 101 and the second composite pole piece 102.

In some embodiments, the first discharging device 10 and the second discharging device 20 are symmetrically disposed at both sides of the winding device 30. Therefore, the overall distribution of the mechanisms of the battery cell winding device 100 is more uniform, the overall structure can be more compact, and the possibility of mutual interference during the blanking of the first discharging device 10 and the second discharging device 20 can also be reduced.

In certain embodiments, the winding device 30 includes a first in-roll guide-roller set 32 and a second in-roll guide-roller set 34. The first and second roll-in guide-roller sets 32, 34 are both disposed upstream of the winding needles. The first winding-in guide roller group 32 is used for conveying the first composite pole piece 101 to the winding needle. The second set of in-wind guide rollers 34 is used to transport the second composite pole piece 102 to the winding needle.

It will be appreciated that the first roll-in guide roller set 32 described above may include a plurality of roll-in guide rollers arranged at intervals. The second roll-in guide roller set 34 may include a plurality of roll-in guide rollers arranged at intervals.

In some embodiments, the first and second roll-in guide roller sets 32, 34 are symmetrically disposed on opposite sides of the winding needle.

In certain embodiments, the first cell winding apparatus 100 includes a first composite pole piece cutter mechanism 80 and a second composite pole piece cutter mechanism 81. The first composite pole piece cutter mechanism 80 is disposed at the downstream of the first discharging device 10. The first composite pole piece cutter mechanism 80 is positioned between the first discharging device 10 and the winding device 30. The second composite pole piece cutter mechanism 81 is arranged at the downstream of the second discharging device 20. The second composite pole piece cutter mechanism 81 is positioned between the second discharging device 20 and the winding device 30. The first composite pole piece cutter mechanism 80 is used for cutting off the first composite pole piece 101. The second composite pole piece cutter mechanism 81 is used for cutting off the second composite pole piece 102. This can improve the production efficiency.

In certain embodiments, the first cell winding apparatus 100 includes a first tension adjustment mechanism 90 and a second tension adjustment mechanism 91. The first tension adjusting mechanism 90 is disposed between the first discharging device 10 and the winding device 30. The second tension adjusting mechanism 91 is disposed between the second discharging device 20 and the winding device 30. The first tension adjustment mechanism 90 is used to adjust the tension of the first composite pole piece 101. The second tension adjusting mechanism 91 is used for adjusting the tension of the second composite pole piece 102. This can improve the stability of the operation of the first cell winding apparatus 100.

It is understood that the first tension adjustment mechanism 90 may include a plurality of tension rollers. The second tension adjusting mechanism 91 may include a plurality of tension rollers.

In certain embodiments, the first cell winding apparatus 100 includes a clamping mechanism 92. The clamping mechanism 92 is disposed upstream of the winding device 30. The clamping mechanism 92 is positioned between the first discharging device 10 and the winding device 30. The clamping mechanism 92 is positioned between the second discharging device 20 and the winding device 30. The clamping mechanism 92 is used to clamp the first composite pole piece 101 and the second composite pole piece 102. This can improve the production efficiency of the cell winding apparatus 100.

It is understood that the clamping mechanism 92 may include a first clamping roller 921 and a second clamping roller 922. The first composite pole piece 101 and the second composite pole piece 102 are located between a first pinch roller 921 and a second pinch roller 922. The first and second pinch rollers 921, 922 are movable relative to each other to pinch the first and second composite pole pieces 101, 102.

It is to be understood that the number of the first pinch rollers 921 may be plural, and the number of the second pinch rollers 922 may be plural. It will be appreciated that the plurality of first pinch rollers 921 may be located on the same side of the first composite pole piece 101 and the second composite pole piece 102. It will be appreciated that a plurality of second clamping rollers 922 may be located on the same side of the first composite pole piece 101 and the second composite pole piece 102.

In certain embodiments, the cell winding apparatus 100 includes two feeding robots (not shown). One of the two feeding manipulators is located between the first discharging device 10 and the winding device 30, and the other feeding manipulator is located between the second discharging device 20 and the winding device 30. One of the two feeding robots is used to feed the first composite pole piece 101 to the winding device 30. The other of the two feeder robots is used to transport the second composite pole piece 102 to the winding device 30.

Referring to fig. 6, a second method for manufacturing a battery cell according to the present invention can be applied to the battery cell winding apparatus 200. The preparation method of the second battery cell comprises the following steps:

providing a first composite pole piece 101a, wherein the first composite pole piece 101a is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot lamination;

providing a second composite pole piece 102a, wherein the second composite pole piece 102a is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination;

providing a third composite pole piece 103a, wherein the third composite pole piece 103a is a composite piece of an integrated structure formed by a fifth diaphragm, a third positive pole piece, a sixth diaphragm and a third negative pole piece through hot lamination;

and winding the first composite pole piece 101a, the second composite pole piece 102a and the third composite pole piece 103a to manufacture a battery core.

In the first composite pole piece 101a, the first separator, the first negative pole piece, the second separator and the first positive pole piece are sequentially stacked; in the second composite pole piece 102a, the third diaphragm, the second negative pole piece, the fourth diaphragm and the second positive pole piece are sequentially stacked; in the third composite electrode sheet 103a, the fifth separator, the third positive electrode sheet, the sixth separator, and the third negative electrode sheet are sequentially stacked. The possibility of the problems of folding the pole piece, winding dust and the like can be effectively reduced by adopting the winding mode of the composite pole piece.

The above-described second cell manufacturing method can be implemented by the cell winding apparatus 200. The cell winding device 200 includes a first discharging device 210, a second discharging device 220, a third discharging device 221, and a winding device 230. The first discharging device 210 is used for outputting the first composite pole piece 101 a. The first composite pole piece 101a is a composite piece formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot lamination in an integrated structure. The second discharging device 220 is used for outputting the second composite pole piece 102 a. The second composite pole piece 102a is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination. The third discharging device 221 is configured to output a third composite pole piece 103 a. The third composite pole piece 103a is a composite piece which is formed by hot-laminating a fifth diaphragm, a third positive pole piece, a sixth diaphragm and a third negative pole piece into an integral structure.

The winding device 230 is disposed downstream of the first discharging device 210, the second discharging device 220, and the third discharging device 221. The winding device 230 is used for winding the first composite pole piece 101a, the second composite pole piece 102a and the third composite pole piece 103a to manufacture a battery core.

To sum up, in the cell winding apparatus 200 according to the embodiment of the present invention, the first discharging device 210 outputs the first composite pole piece 101a, the second discharging device 220 outputs the second composite pole piece 102a, the third discharging device 221 outputs the third composite pole piece 103a, and then the first composite pole piece 101a, the second composite pole piece 102a, and the third composite pole piece 103a are respectively conveyed to the winding station of the winding device 230 to complete the winding operation. Compared with a processing mode that the positive plate, the diaphragm, the negative plate and the diaphragm independently enter the winding process, the blanking belt path of the battery cell winding equipment 200 provided by the embodiment of the invention is reduced, so that the use number of parts is reduced, the overall structure of the equipment is simplified, and the winding work efficiency is improved.

In addition, the battery cell winding device 200 of the embodiment of the invention not only effectively reduces the total number of sheets entering the winding process, thereby reducing the alignment difficulty, improving the winding precision, but also effectively reducing the possibility of problems such as pole piece folding and winding dust, and further improving the yield and production efficiency of the battery cell. In addition, 12 layers of materials (each composite pole piece includes a negative pole piece, a positive pole piece, and two layers of diaphragms, that is, 4 layers of materials) can be added to each winding device 230 of the battery cell winding apparatus 200 according to the embodiment of the present invention, so that the working efficiency of the battery cell winding apparatus is improved.

The method for detecting the alignment degree of the composite pole piece in the second method for manufacturing the electrical core of the present invention may refer to the method for manufacturing the first electrical core. In the method for detecting a material in a discharging device in the second method for manufacturing a battery cell of the present invention, reference may be made to the first method for manufacturing a battery cell.

A further structure of the above-described cell winding apparatus 200 of the present invention may refer to the above-described cell winding apparatus 100.

Referring to fig. 7, a third method for manufacturing a battery cell according to the present invention can be applied to a battery cell winding apparatus 300. The preparation method of the third battery cell comprises the following steps:

providing a first composite pole piece 101b, wherein the first composite pole piece 101b is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot lamination;

providing a second composite pole piece 102b, wherein the second composite pole piece 102b is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination;

providing a third composite pole piece 103b, wherein the third composite pole piece 103b is a composite piece of an integrated structure formed by a fifth diaphragm, a third positive pole piece, a sixth diaphragm and a third negative pole piece through hot lamination;

providing a fourth composite pole piece 104b, wherein the fourth composite pole piece 104b is a composite piece of an integrated structure formed by a seventh diaphragm, a fourth positive pole piece, an eighth diaphragm and a fourth negative pole piece through hot lamination;

and winding the first composite pole piece 101b, the second composite pole piece 102b, the third composite pole piece 103b and the fourth composite pole piece 104b to manufacture a battery core.

In the first composite pole piece 101b, the first separator, the first negative pole piece, the second separator and the first positive pole piece are sequentially stacked; in the second composite pole piece 102b, the third diaphragm, the second negative pole piece, the fourth diaphragm and the second positive pole piece are sequentially stacked; in the third composite electrode sheet 103b, the fifth separator, the third positive electrode sheet, the sixth separator, and the third negative electrode sheet are sequentially stacked. In the fourth composite pole piece 104b, the seventh separator, the fourth positive pole piece, the eighth separator, and the fourth negative pole piece are sequentially stacked. The possibility of the problems of folding the pole piece, winding dust and the like can be effectively reduced by adopting the winding mode of the composite pole piece.

The above-described third cell manufacturing method can be implemented by the cell winding apparatus 300. The cell winding device 300 includes a first discharging device 310, a second discharging device 320, a third discharging device 321, a fourth discharging device 322, and a winding device 330. The first discharging device 310 is used for outputting the first composite pole piece 101 b. The first composite pole piece 101b is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot lamination. The second discharging device 320 is used for outputting the second composite pole piece 102 b. The second composite pole piece 102b is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination. The third discharging device 321 is used for outputting the third composite pole piece 103 b. The third composite pole piece 103b is a composite piece of an integrated structure formed by hot lamination of a fifth diaphragm, a third positive pole piece, a sixth diaphragm and a third negative pole piece. The fourth discharging device 322 is used for outputting the fourth composite pole piece 104 b. The fourth composite pole piece 104b is a composite piece of an integrated structure formed by hot lamination of a seventh diaphragm, a fourth positive pole piece, an eighth diaphragm and a fourth negative pole piece.

The winding device 330 is disposed downstream of the first discharging device 310, the second discharging device 320, the third discharging device 321, and the fourth discharging device 322. The winding device 330 is used for winding the first composite pole piece 101b, the second composite pole piece 102b, the third composite pole piece 103b and the fourth composite pole piece 104b to manufacture a battery cell.

To sum up, in the cell winding apparatus 300 according to the embodiment of the present invention, the first discharging device 310 outputs the first composite pole piece 101b, the second discharging device 220 outputs the second composite pole piece 102b, the third discharging device 321 outputs the third composite pole piece 103b, the fourth discharging device 322 outputs the fourth composite pole piece 104b, and then the first composite pole piece 101b, the second composite pole piece 102b, the third composite pole piece 103b, and the fourth composite pole piece 104b are respectively conveyed to the winding station of the winding device 330 to complete the winding operation. In this way, compared with a processing mode in which the positive plate, the diaphragm, the negative plate and the diaphragm independently enter the winding process, 16 layers of materials can be added (each composite plate includes the negative plate, the positive plate and two layers of diaphragms, namely 4 layers of materials) in each winding turn of the winding device 330 of the battery cell winding device 300 according to the embodiment of the present invention, so that the working efficiency of the battery cell winding device is improved. And moreover, the possibility of the problems of pole piece folding, winding dust and the like can be effectively reduced by adopting a composite sheet body winding mode, and the yield and the production efficiency of the battery cell are further improved.

The method for detecting the alignment degree of the composite pole piece in the third method for manufacturing the battery cell of the present invention may refer to the method for manufacturing the first battery cell. In the third method for manufacturing a battery cell of the present invention, reference may be made to the first method for manufacturing a battery cell.

A further structure of the above-described cell winding apparatus 300 of the present invention may refer to the above-described cell winding apparatus 100.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (11)

1. A cell winding apparatus, comprising:

the first discharging device is used for outputting a first composite pole piece, and the first composite pole piece is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression;

the second discharging device is used for outputting a second composite pole piece, and the second composite pole piece is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot compression;

and the winding device is arranged at the downstream of the first discharging device and the second discharging device and is used for winding the first composite pole piece and the second composite pole piece to manufacture the battery cell.

2. The cell winding apparatus according to claim 1, wherein the first discharging device and the second discharging device are symmetrically disposed at two sides of the winding device.

3. The cell winding apparatus of claim 1, wherein the winding device comprises a winding pin, and the winding device is rotated by the winding pin to wind the first composite pole piece and the second composite pole piece.

4. The cell winding apparatus according to claim 3, wherein the winding device includes a first roll-in guide roller set and a second roll-in guide roller set, the first roll-in guide roller set and the second roll-in guide roller set are both disposed upstream of the winding needle, the first roll-in guide roller set is configured to convey the first composite pole piece to the winding needle, and the second roll-in guide roller set is configured to convey the second composite pole piece to the winding needle.

5. The cell winding device according to claim 4, wherein the first winding-in guide roller set and the second winding-in guide roller set are symmetrically arranged on two sides of the winding needle.

6. The cell winding apparatus of claim 1, wherein the cell winding apparatus comprises a first sensor, a second sensor, a prompting device, and a control device, and the control device is electrically connected to the first sensor, the second sensor, the prompting device, and the control device;

the first sensor is arranged on the first emptying device, the second sensor is arranged on the second emptying device, the first sensor is used for detecting the material condition of the first emptying device, the second sensor is used for detecting the material condition of the second emptying device, and the control device is used for controlling the working state of the prompting device according to the detection result of the first sensor and/or the second sensor.

7. The cell winding apparatus of claim 1, wherein the cell winding apparatus comprises a first composite pole piece cutter mechanism and a second composite pole piece cutter mechanism, the first composite pole piece cutter mechanism is disposed at a downstream of the first discharging device, the first composite pole piece cutter mechanism is located between the first discharging device and the winding device, the second composite pole piece cutter mechanism is disposed at a downstream of the second discharging device, the second composite pole piece cutter mechanism is located between the second discharging device and the winding device, the first composite pole piece cutter mechanism is configured to cut off the first composite pole piece, and the second composite pole piece cutter mechanism is configured to cut off the second composite pole piece.

8. The cell winding apparatus of claim 1, wherein the cell winding apparatus comprises a first tension adjustment mechanism and a second tension adjustment mechanism, the first tension adjustment mechanism is disposed between the first discharging device and the winding device, the second tension adjustment mechanism is disposed between the second discharging device and the winding device, the first tension adjustment mechanism is configured to adjust the tension of the first composite pole piece, and the second tension adjustment mechanism is configured to adjust the tension of the second composite pole piece.

9. The cell winding apparatus of claim 1, comprising a clamping mechanism disposed upstream of the winding device, the clamping mechanism being located between the first discharge device and the winding device, the clamping mechanism being located between the second discharge device and the winding device, the clamping mechanism being configured to clamp the first and second composite pole pieces.

10. A cell winding apparatus, comprising:

the first discharging device is used for outputting a first composite pole piece, and the first composite pole piece is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression;

the second discharging device is used for outputting a second composite pole piece, and the second composite pole piece is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot compression;

the third discharging device is used for outputting a third composite pole piece, and the third composite pole piece is a composite piece of an integrated structure formed by a fifth diaphragm, a third positive pole piece, a sixth diaphragm and a third negative pole piece through hot compression;

and the winding device is arranged at the downstream of the first discharging device, the second discharging device and the third discharging device and is used for winding the first composite pole piece, the second composite pole piece and the third composite pole piece to manufacture a battery cell.

11. The preparation method of the battery cell is characterized by comprising the following steps:

providing a first composite pole piece, wherein the first composite pole piece is a composite piece of an integrated structure formed by a first diaphragm, a first positive pole piece, a second diaphragm and a first negative pole piece through hot compression;

providing a second composite pole piece, wherein the second composite pole piece is a composite piece of an integrated structure formed by a third diaphragm, a second positive pole piece, a fourth diaphragm and a second negative pole piece through hot lamination;

and winding the first composite pole piece and the second composite pole piece to manufacture the battery core.

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