CN110611070B

CN110611070B - Electrode diaphragm and pole piece sample preparation device and sample preparation method using same

Info

Publication number: CN110611070B
Application number: CN201910816584.2A
Authority: CN
Inventors: 王洪伟; 刘道淦; 刘丰; 侯远强
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2022-07-05
Anticipated expiration: 2039-08-30
Also published as: CN110611070A

Abstract

The invention relates to the technical field of battery manufacturing, and discloses a device for manufacturing a sample of an electrode diaphragm and a pole piece and a sample manufacturing method using the device, wherein the device comprises a rack (100), an upper pressing plate (110) and a lower pressing plate (120) which can move relatively and are pressed are correspondingly arranged on the rack, a hot pressing area (113) is arranged on the pressing surface of the upper pressing plate or the lower pressing plate, the device also comprises a temperature control module (111) and a pressure control module (112), and the temperature control module and the pressure control module are respectively connected with the hot pressing area. The invention provides a sample preparation device for an electrode diaphragm and a pole piece and a sample preparation method using the device, which can finish sample preparation of a plurality of samples by one-time operation, further shorten sample preparation time, improve production efficiency and further provide effective guarantee for the accuracy and consistency of subsequent diaphragm and pole piece peel strength tests.

Description

Electrode diaphragm and pole piece sample preparation device and sample preparation method using same

Technical Field

The invention relates to the technical field of battery manufacturing, in particular to an electrode diaphragm and pole piece sample preparation device and a sample preparation method using the device.

Background

In the manufacturing process of the battery, the peel strength between the pole piece and the diaphragm separating the positive pole piece and the negative pole piece needs to be evaluated, the poor peel strength between the diaphragm and the pole piece causes the separation of the diaphragm and the pole piece in the later period, the infiltration of the diaphragm on the pole piece is influenced, meanwhile, the separation of the diaphragm and the pole piece causes the lengthening of the lithium ion migration path, the interface of the battery is influenced, and the performances of the battery including circulation, internal resistance and the like in the later period are further influenced.

In prior art, need separate diaphragm and pole piece after disassembling to the book core after the hot pressing, promptly: the diaphragm and the pole piece need to be integrally disassembled, and then the peeling strength is measured on peeling test equipment. In the prior art, the winding core needs to be disassembled destructively, the integrity of the diaphragm and the pole piece cannot be ensured, and the stripping force cannot be measured because the disassembled diaphragm is separated from the pole piece; meanwhile, the core disassembling in the mode has high cost and wastes time and labor. Therefore, it is desired to develop a device capable of sampling the winding core after the thermal pressing of the separator and the pole piece so as to test the peeling strength of the separator and the pole piece.

Disclosure of Invention

The invention aims to overcome the problem that no special electrode diaphragm and pole piece sample preparation device exists in the prior art, and provides the electrode diaphragm and pole piece sample preparation device and the sample preparation method using the device.

In order to achieve the above object, the present invention provides, on one hand, an electrode membrane and pole piece sample preparation device, which includes a frame, an upper pressing plate and a lower pressing plate that are capable of moving relatively and press-fitting are correspondingly disposed on the frame, a hot pressing area is disposed on a press-fitting surface of the upper pressing plate or the lower pressing plate, the electrode membrane and pole piece sample preparation device further includes a temperature control module for adjusting a hot pressing temperature and a pressure control module for adjusting a pressure, and the temperature control module and the pressure control module are respectively connected to the hot pressing area.

Preferably, the upper pressure plate is telescopically fixed at the upper part of the frame through a plurality of lower pressure cylinders, and the lower pressure plate is correspondingly arranged at the lower part of the frame; and the rack is provided with a lower air cylinder control module for controlling the plurality of lower air cylinders to do telescopic motion.

Preferably, the upper press plate comprises a mounting groove and a hot press plate detachably inserted into the mounting groove, and the hot press plate is connected with the temperature control module and the pressure control module; the hot pressing area is arranged on the lower surface of the hot pressing plate; the electrode diaphragm and pole piece sample preparation device further comprises a cutter template detachably inserted into the mounting groove, and a die-cutting rule is arranged on the cutter template.

Preferably, a handle is arranged on the outer side of the hot pressing plate and/or the cutting die plate; all be equipped with between mounting groove and the hot pressboard and make between mounting groove and the cutting die board hot pressboard, cutting die board are in the locking portion of firm location in the mounting groove.

Preferably, a laser level probe for detecting the levelness of the upper pressure plate is arranged on the side wall of the rack; and/or a horizontal display is arranged in the center of the bottom of the rack, and horizontal adjusting blocks for adjusting the levelness of the rack are arranged on two sides of the rack.

Preferably, the lower pressing plate is provided with a sample positioning groove for accommodating the superposed or wound electrode diaphragm and the pole piece.

Preferably, the stacked or rolled electrode separator and the pole piece are multi-layered.

The invention provides a sample preparation method using the electrode diaphragm and the pole piece sample preparation device, which comprises the following steps:

step 100: and laminating the diaphragm and the corresponding pole piece or winding the diaphragm into a sample and then fixing the sample on the lower pressing plate, so that the upper pressing plate is attached to the lower pressing plate to hot-press the sample.

Preferably, the upper press plate comprises a mounting groove and a hot press plate detachably inserted into the mounting groove, and the hot press plate is connected with the temperature control module and the pressure control module; the hot pressing area is arranged on the lower surface of the hot pressing plate; the electrode diaphragm and pole piece sample preparation device also comprises a knife template which is detachably inserted into the mounting groove, and a die-cutting rule is arranged on the knife template;

step 100 is followed by step 200: and after the hot pressing plate is taken out of the mounting groove of the upper pressing plate, the cutter template is inserted into the mounting groove, so that the upper pressing plate is pressed downwards to be attached to the lower pressing plate, and the sample is cut to form a sample.

Preferably, the step 100 is further preceded by: and adjusting and ensuring that the electrode diaphragm and the pole piece sample preparation device are in a horizontal state, and the upper pressure plate is also in a horizontal state.

Through the technical scheme, the upper pressing plate and the lower pressing plate which can move relatively and are pressed are correspondingly arranged on the rack, the hot pressing area is arranged on the pressing surface of the upper pressing plate or the lower pressing plate, the upper pressing plate and the lower pressing plate are pressed relatively at proper temperature and pressure, sample preparation can be completed through one-time operation, the sample preparation time is shortened, the production efficiency is improved, and further, the accuracy and the consistency of the subsequent testing of the peeling strength of the diaphragm and the pole piece are effectively guaranteed.

Drawings

FIG. 1 is a schematic view of an overall structure of an embodiment of an electrode separator and a sample preparation device for a pole piece according to the present invention;

FIG. 2 is a schematic view of a hot press plate inserted into the mounting groove of the upper press plate in FIG. 1;

FIG. 3 is a schematic structural view of a knife plate inserted into the mounting groove of the upper platen in FIG. 1;

FIG. 4 is a schematic cross-sectional structure of a sample prepared from an electrode separator and a pole piece.

Description of the reference numerals

100 chassis 101 panel 102 pressure display

103 temperature display 104 adjusting panel 105 level adjusting block

106 horizontal display 107 laser level gauge probe 110 upper platen

111 temperature control module 112 pressure control module 113 hot pressing area

114 push-down cylinder 115 push-down cylinder control module 116 mounting groove

1161 handle 1162 locking part 117 hot press plate

119-knife template 1191 die-cutting knife 120 lower pressing plate

121 sample constant head tank 200 electrode diaphragm 300 pole piece

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.

As shown in fig. 1, the present invention provides an electrode membrane and pole piece sample preparation device, which includes a machine frame 100, wherein an upper pressing plate 110 and a lower pressing plate 120 which can move relatively and are pressed are correspondingly arranged on the machine frame 100, a hot pressing area 113 is arranged on a pressing surface of the upper pressing plate 110 or the lower pressing plate 120, the electrode membrane and pole piece sample preparation device further includes a temperature control module 111 for adjusting a hot pressing temperature and a pressure control module 112 for adjusting a pressure, and the temperature control module 111 and the pressure control module 112 are respectively connected to the hot pressing area 113. That is, the upper platen 110 and the lower platen 120 which can move relatively and are pressed together are correspondingly arranged on the frame 100, and the hot pressing area 113 is arranged on the pressing surface of the upper platen 110 or the lower platen 120, so that the upper platen 110 and the lower platen 120 are pressed together relatively at a proper temperature and pressure, sample preparation can be completed by one-time operation, the sample preparation time is shortened, the production efficiency is improved, and further, the accuracy and the consistency of the subsequent membrane and pole piece peeling strength test are effectively guaranteed.

Furthermore, in the embodiment shown in fig. 1, the frame 100 is a rectangular frame surrounded by four frames, namely, an upper frame, a lower frame, a left frame and a right frame, the upper platen 110 is telescopically fixed on the upper portion of the frame 100 by a plurality of lower air cylinders 114, the temperature control module 111, the pressure control module 112 and the plurality of lower air cylinders 114 are respectively arranged on the upper side and the lower side of the frame on the upper portion of the frame 100, and the frame 100 is provided with a lower air cylinder control module 115. The lower pressing plate 120 is correspondingly disposed on the frame of the lower portion of the frame 100. The frame 100 is further provided with a panel 101 at one side, and in order to ensure that the upper pressure plate 110 and the lower pressure plate 120 are pressed against each other at a proper temperature and pressure, a pressure display 102 and a temperature display 103, and a pressure and temperature adjustment panel 104 are provided on the panel 101. During the operation of the device, the user can observe the pressure displayed on the pressure display 102 and the temperature displayed on the temperature display 103 through monitoring, and can adjust the pressure and the temperature of the device through adjusting knobs on the adjusting panels of the pressure and the temperature according to requirements. Since the control and adjustment of the pressure and the temperature do not belong to the key content in the technical scheme of the present invention, a person skilled in the art can select, install and adjust the control module according to actual needs, and specific contents are not described herein again. It should be noted that the electrode diaphragm and pole piece sample preparation device provided by the present invention includes, in addition to the above-mentioned device structure and components, auxiliary components and structures such as a pipe for cylinder control, a lead-in hole for a heating wire, and a receiving hole, which are not described herein again.

Further, in order to simultaneously press and cut the diaphragm and the pole piece by the upper press plate, as shown in fig. 2 and fig. 3, the upper press plate 110 includes an installation groove 116 and a hot press plate 117 detachably inserted into the installation groove 116, as described above, in order to realize hot pressing of the diaphragm and the pole piece, the hot press plate 117 is provided with a temperature control module for adjusting a hot press temperature and a pressure control module for adjusting a pressure, and a hot press area 113 respectively connected to the temperature control module and the pressure control module is disposed at a lower portion of the hot press plate 117. Furthermore, the hot-pressing area 113 should have a layer of PET film with a thickness of about 1mm, and a layer of silicone oil paper should be added between the PET film and the sample during the hot-pressing process, so as to ensure that the surface of the sample is not damaged while ensuring the hot-pressing quality, thereby further ensuring the accuracy and stability of the test result obtained during the subsequent performance test. Meanwhile, the electrode diaphragm and pole piece sample preparation device further comprises a cutter template 119 which is detachably inserted into the mounting groove 116, and a die-cutting knife 1191 is arranged on the cutter template 119. In the embodiment shown in fig. 3, the number of the die-cutting tools 1191 is three, the sample preparation samples of the diaphragm and the pole piece which are pressed together by hot pressing can be equally divided into three sections, and the three sections can be respectively used for testing different parameters and performances in subsequent processes. Of course, in actual practice, the number of the cutting bars 1191 may be set as required, and is not limited to three in the present embodiment. In addition, in order to facilitate the extraction and insertion of the hot pressing plate 117 and the cutting die plate 119 in the mounting groove 116, a handle 1161 is further provided on the outer side of the hot pressing plate 117 and/or the cutting die plate 119. Referring to fig. 1, in order to prevent the hot press plate 117 and the cutting die plate 119 from slipping out after being inserted into the mounting groove 116 and affecting the working efficiency, a locking portion 1162 is disposed between the mounting groove 116 and the hot press plate 117 and between the mounting groove 116 and the cutting die plate 119 to stably position the hot press plate 117 and the cutting die plate 119 in the mounting groove 116. The specific structure of the locking portion 1162 can be realized by various means that are conventional in the art, such as a baffle plate and a positioning pin, and those skilled in the art can select and set the locking portion as needed in practical application, which is not described herein again.

In order to ensure the surface flatness of the membrane and the pole pieces which are hot-pressed together, the upper pressing plate is driven by the air cylinder to press towards the lower pressing plate, so that the levelness of the device frame 100 in the setting environment must be ensured. As shown in fig. 1, a laser level probe 107 for detecting the levelness of the upper platen 110 is disposed on a side wall of the rack 100, a horizontal display 106 is disposed at the center of the bottom of the rack 100, and horizontal adjusting blocks 105 for adjusting the levelness of the rack 100 are disposed on two sides of the rack 100. Before the device starts to work, firstly, the horizontal adjusting block 105 is adjusted, and the horizontal display 106 is observed at the same time, so that the machine frame 100 of the device is ensured to be in a horizontal state; secondly, the laser level probe 107 is utilized to detect the horizontal state of the upper press plate 110, and the telescopic degree of the plurality of lower press cylinders 114 can be adjusted to meet the horizontal requirement, so that the hot press plate 117 and the cutting die plate 119 can meet the horizontal requirement before corresponding operation is performed, and after the adjustment is completed, the next operation procedure can be performed.

In order to prevent the membrane and the pole piece from being dislocated in the hot pressing process, a sample positioning groove 121 for accommodating the stacked or wound electrode membrane and the pole piece is arranged on the lower pressing plate 120. In order to ensure a good hot-pressing effect while positioning, the sample positioning slot 121 is composed of four frames, the four frames are configured to be retractable with respect to the upper surface of the lower platen 120, and elastic retractable structures such as elastic pieces or springs are arranged at the positions of the four frames on the lower platen 120 for embedding the sample positioning slot 121, so as to achieve the retractable property of the sample positioning slot 121. When the upper platen 110 is not pressed down, the sample positioning groove 121 plays a role in positioning and limiting the stacked or wound electrode diaphragm and the wound electrode sheet, and after the upper platen 110 is pressed down, because the frame of the sample positioning groove 121 can be stretched, the sample positioning groove is compressed under the pressure action of the upper platen 110, at this time, the hot pressing area 113 in the middle of the upper platen 110 is directly attached to the stacked or wound electrode diaphragm and the wound electrode sheet, and the electrode diaphragm and the wound electrode sheet are hot-pressed and molded under a proper pressure and temperature to prepare a sample preparation sample, wherein the cross-sectional structures of the electrode diaphragm and the pole sheet sample preparation sample can be single-layer or multi-layer. In the embodiment shown in fig. 4, the membrane is a multi-layer structure comprising three layers of membrane and two layers of pole pieces.

The sample preparation method of the electrode separator and the electrode sheet sample preparation device provided by the present invention is described in detail below with reference to fig. 1 to 4. In particular, the present invention relates to a method for producing,

firstly, the horizontal adjusting block 105 needs to be adjusted, and the horizontal display 106 needs to be observed at the same time, so that the rack 100 of the device is ensured to be in a horizontal state; secondly, the upper pressure plate 110 is detected and adjusted by using the laser level meter probe 107 to meet the level requirement, so that the hot press plate 117 and the knife die plate 119 meet the level requirement before corresponding operation is executed; then, after the diaphragm and the corresponding pole piece are laminated or wound into a product to be hot-pressed, the product to be hot-pressed is placed in a sample positioning groove 121 of a lower pressing plate; and the hot press plate 117 is inserted into the mounting groove 116; under the condition of ensuring that the compressed air is sufficient, the corresponding hot-pressing pressure and temperature are adjusted to the process requirement value through the pressure adjusting module and the temperature adjusting module, and the process requirement value needs to ensure the same pressure and temperature for hot-pressing of the winding core in the electric core. Under the prerequisite of guaranteeing safety, trigger control button, top board 110 pushes down and pushes down the sample constant head tank 121 back of pressing down the clamp plate 120 and impress clamp plate 120, will treat that the hot pressing becomes the sample.

After the sample hot-pressing process is completed, the locking part 1162 is opened, the hot-pressing plate 117 is taken out of the mounting groove 116 through the handle 1161, the knife template 119 is inserted into the mounting groove 116, and the knife template 119 is fixed by the locking part 1162; adjusting the corresponding die cutting pressure to a process required value through a pressure adjusting module; under the premise of ensuring safety, a control button is triggered, the upper pressure plate 110 drives the cutter template 119 to press downwards, the sample positioning groove 121 is pressed into the lower pressure plate 120 after the cutter template is attached to the lower pressure plate 120, and sample die cutting is completed, namely sample preparation.

After the two steps, the sample after the hot-pressing die-cutting is shown in fig. 4, and the sample is placed on a peel strength testing instrument by using a corresponding clamp for a peel force test.

In summary, the method for preparing the sample of the electrode diaphragm and the electrode sheet sample preparation device provided by the invention mainly comprises the following steps:

step 100: and laminating the diaphragm and the corresponding pole piece or winding the diaphragm and the corresponding pole piece into a product to be hot-pressed and then fixing the product on the lower pressing plate, so that the upper pressing plate is attached to the lower pressing plate, and the product to be hot-pressed is hot-pressed to form a sample.

Further, the step 100 is followed by the step 200: and after the hot pressing plate is taken out from the mounting groove of the upper pressing plate, inserting a cutter template into the mounting groove, pressing the upper pressing plate down to be attached to the lower pressing plate, and cutting the sample to form a sample.

Still further, step 100 is preceded by: and adjusting and ensuring that the electrode diaphragm and the pole piece sample preparation device are in a horizontal state, and the upper pressure plate is also in a horizontal state.

In summary, the invention provides an electrode diaphragm and pole piece sample preparation device and a sample preparation method using the device, which can complete sample preparation of a plurality of samples by one-time operation, shorten sample preparation time, improve production efficiency, and further provide effective guarantee for the accuracy and consistency of subsequent diaphragm and pole piece peel strength tests.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the present invention, various simple modifications can be made to the technical solution of the present invention, for example, three cutting dies arranged on a cutting die plate can be changed into four or more cutting dies, and sample preparation of more samples can be completed in one run, thereby improving efficiency. In addition, in the embodiment of the invention, the upper pressing plate moves downwards to be pressed with the lower pressing plate under the action of the lower pressing cylinder, and in practical application, the lower pressing plate can also move upwards to be pressed with the upper pressing plate or the upper pressing plate and the lower pressing plate move relatively to each other according to actual requirements and are pressed with each other at a position between the original positions of the upper pressing plate and the lower pressing plate. Meanwhile, the hot pressing area and the die-cutting rule can be arranged on any one of the upper pressing plate and the lower pressing plate, and the technical effect of the invention can be realized. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should also be considered as disclosed in the present invention, and all such modifications and combinations are intended to be included within the scope of the present invention.

Claims

1. An electrode diaphragm and pole piece sample preparation device comprises a frame (100) and is characterized in that, an upper pressing plate (110) and a lower pressing plate (120) which can move relatively and are pressed are correspondingly arranged on the frame (100), a hot pressing area (113) is arranged on the pressing surface of the upper pressing plate (110) or the lower pressing plate (120), the electrode diaphragm and pole piece sample preparation device also comprises a temperature control module (111) for adjusting the hot-pressing temperature and a pressure control module (112) for adjusting the pressure, the temperature control module (111) and the pressure control module (112) are each connected to the hot nip (113), the upper press plate (110) comprises a mounting groove (116) and a hot press plate (117) which is detachably inserted into the mounting groove (116), the hot pressing plate (117) is connected with the temperature control module (111) and the pressure control module (112); the hot nip (113) is disposed on a lower surface of the hot platen (117);

the electrode diaphragm and pole piece sample preparation device further comprises a cutter template (119) which is detachably inserted into the mounting groove (116), and a die-cutting rule (1191) is arranged on the cutter template (119).

2. The electrode diaphragm and pole piece sample preparation device according to claim 1, wherein the upper pressing plate (110) is telescopically fixed on the upper part of the machine frame (100) through a plurality of lower pressing air cylinders (114), and the lower pressing plate (120) is correspondingly arranged on the lower part of the machine frame (100); and a lower air cylinder control module (115) for controlling the telescopic motion of the lower air cylinders (114) is arranged on the frame (100).

3. The electrode separator and pole piece sampling device according to claim 1, wherein a handle (1161) is arranged on the outer side of the hot pressing plate (117) and/or the knife die plate (119);

all be equipped with between mounting groove (116) and hot pressing board (117) between mounting groove (116) and cutting die board (119) and make hot pressing board (117), cutting die board (119) are in locking portion (1162) of firm location in mounting groove (116).

4. The electrode diaphragm and pole piece sampling device according to claim 1, wherein a laser level probe (107) for detecting the levelness of the upper pressure plate (110) is arranged on the side wall of the machine frame (100); and/or a horizontal display (106) is arranged in the center of the bottom of the rack (100), and horizontal adjusting blocks (105) for adjusting the levelness of the rack (100) are arranged on two sides of the rack.

5. The electrode membrane and pole piece sampling device according to claim 1, wherein the lower pressing plate (120) is provided with a sample positioning groove (121) for accommodating the stacked or wound electrode membrane (200) and pole piece (300).

6. The electrode separator and pole piece sampling device according to claim 5, wherein the stacked or rolled electrode separator (200) and pole piece (300) are multi-layered.

7. A method for preparing a sample by using the electrode diaphragm and pole piece preparing device according to any one of claims 1, 2 and 4-6, which comprises the following steps:

8. The method for preparing a sample according to claim 7, wherein the upper platen (110) comprises a mounting groove (116) and a hot platen (117) detachably inserted into the mounting groove (116), the hot platen (117) being connected to the temperature control module (111) and the pressure control module (112); the hot nip (113) is disposed on a lower surface of the hot platen (117);

the electrode diaphragm and pole piece sample preparation device also comprises a cutter template (119) which is detachably inserted into the mounting groove (116), and a die-cutting rule (1191) is arranged on the cutter template (119);

step 100 is followed by step 200: and after the hot pressing plate (117) is taken out of the mounting groove (116) of the upper pressing plate (110), inserting the knife template (119) into the mounting groove (116), and pressing down the upper pressing plate (110) to be attached to the lower pressing plate (120) so as to cut the sample to form the sample preparation.

9. The method for preparing a sample according to claim 7, wherein the step 100 is further preceded by: and adjusting and ensuring that the electrode diaphragm and the pole piece sample preparation device are in a horizontal state, and the upper pressure plate (110) is also in a horizontal state.