阅读说明：本技术 电池隔膜加工设备及其分层装置 (Battery diaphragm processing equipment and layering device thereof ) 是由 王珑 张金辉 安佳琳 焦令宽 王博 茹志斌 秦鹏 王丽芳 于 2018-07-19 设计创作，主要内容包括：本发明涉及电池隔膜加工设备及其分层装置,电池隔膜加工用分层装置包括用于设置在挤出机和模头之间的分层单元,所述分层单元包括至少两个供熔体进入以将熔体分割成多层的熔体通道,各熔体通道沿电池隔膜厚度方向布置,所述分层装置还包括对处于熔体通道内的熔体进行冷却的冷却装置,所述电池隔膜加工用分层装置还包括用于连通分层单元和模头并对流出分层单元的熔体进行加热熔融的出料单元。从微观结构上相当于在电池隔膜增加了多个纤维层,从而提高电池隔膜的综合性能。解决了现有技术中电池隔膜加工设备加工出的电池隔膜强度相对较低,难以满足电池高能量密度要求的问题。(The invention relates to battery diaphragm processing equipment and a layering device thereof, wherein the layering device for processing a battery diaphragm comprises a layering unit arranged between an extruder and a die head, the layering unit comprises at least two melt channels for melt to enter so as to divide the melt into multiple layers, each melt channel is arranged along the thickness direction of the battery diaphragm, the layering device further comprises a cooling device for cooling the melt in the melt channels, and the layering device for processing the battery diaphragm further comprises a discharging unit for communicating the layering unit with the die head and heating and melting the melt flowing out of the layering unit. The microstructure is equivalent to that a plurality of fiber layers are added on the battery separator, so that the comprehensive performance of the battery separator is improved. The problem of among the prior art battery diaphragm processing equipment processed battery diaphragm intensity relatively lower, be difficult to satisfy battery high energy density requirement is solved.)

1. The layering device for processing the battery diaphragm is characterized by comprising a layering unit arranged between an extruder and a die head, wherein the layering unit comprises at least two melt channels for melt to enter so as to divide the melt into multiple layers, each melt channel is arranged in the thickness direction of the battery diaphragm, and the layering device for processing the battery diaphragm further comprises a cooling device for cooling the melt in the melt channels.

2. The apparatus of claim 1, wherein the lamination unit comprises at least three detachably attachable lamination segments, and the melt passes through spaces between adjacent lamination segments.

3. The layering device for battery separator processing according to claim 2, wherein the layering dividing plate comprises two connecting sections and a layering section connecting the two connecting sections, the thickness of the layering section is smaller than that of the connecting sections, and adjacent layering dividing plates are connected in a layering mode through the connecting sections and form the melt channel between the layering sections.

4. The layering device for battery separator processing according to claim 3, wherein two of the layering division plates constituting the layering unit are outer layering division plates, the other layering division plates are inner layering division plates sandwiched between the two outer layering division plates, the thickness of the connection section of the outer layering division plate is larger than that of the connection section of the inner layering division plate, the thickness of the layering section of the outer layering division plate is also larger than that of the layering section of the inner layering division plate, the layering section of the outer layering division plate is disposed to be deviated to one side in the thickness direction of the outer layering division plate, and the layering section of the inner layering division plate is disposed in the middle in the thickness direction of the inner layering division plate.

5. The device for processing the battery diaphragm according to any one of the claims 1 to 4, wherein one lamination unit is provided, and the number of the melt channels on the lamination unit is equal to the set number of the battery diaphragm layers.

6. The layering device for battery separator processing according to any one of claims 1 to 4, wherein at least two layering units are provided, each layering unit is arranged along the direction from the extruder to the die head, and the melt channels on adjacent layering units are arranged in a staggered manner.

7. The battery separator processing lamination device according to any one of claims 1 to 4, wherein the cooling device comprises a cooling pipe for allowing a cooling fluid to enter around the outside of the lamination unit.

8. The battery separator processing layering device according to any one of claims 1 to 4, wherein the battery separator processing layering device further comprises a feeding unit arranged between the extruder and the layering unit, a heating device for heating the melt is arranged outside the feeding unit, a feeding through hole for the melt to pass through is arranged on the feeding unit, one end of the feeding through hole is opened as an inlet of the feeding unit, the other end of the feeding through hole is opened as an outlet of the feeding unit, the inlet of the feeding unit is adapted to the outlet of the die head adapter, the outlet of the feeding unit is adapted to the inlet of the layering unit, and the size of the feeding through hole in the arrangement direction of the melt channel of the layering unit gradually increases along the direction from the inlet to the outlet of the feeding unit.

9. The battery separator processing layering device according to any one of claims 1 to 4, wherein the battery separator processing layering device further comprises a discharging unit arranged between the layering unit and the die head, a heating device for heating the melt is arranged outside the discharging unit, a discharging through hole for the melt flowing out of the layering unit to pass through is arranged on the discharging unit, one end of the discharging through hole is opened as an inlet of the discharging unit, the other end of the discharging through hole is opened as an outlet of the discharging unit, the inlet of the discharging unit is matched with the outlet of the layering unit, the outlet of the discharging unit is matched with the inlet of the die head, and the size of the discharging through hole in the arrangement direction of the melt channel of the layering unit is gradually reduced along the direction from the inlet of the discharging unit to the outlet of the discharging unit.

10. The battery diaphragm processing equipment comprises an extruder for melting raw materials of the battery diaphragm and a die head for extruding the melt, and is characterized by further comprising a layering device arranged between the extruder and the die head, wherein the layering device is used for processing the battery diaphragm and is as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to battery diaphragm processing equipment and a layering device thereof.

Background

With the development of domestic electric automobile technology, more and more battery enterprises put forward higher requirements on the energy density and the volume density of batteries, so that the battery diaphragm has higher requirements on the strength and the puncture performance. The research shows that the battery manufactured by the battery diaphragm with higher strength has lower short circuit rate and better safety under the same thickness. As for the current, polyolefin battery separators are used as the main lithium battery separator material, and the strength improvement space of the material itself has met with a bottleneck. The existing battery diaphragm processing equipment comprises an extruder and a die head for extruding a melt, wherein a battery diaphragm raw material is melted and plasticized in the extruder to form the melt, the melt is extruded from the die head to obtain a battery diaphragm cast sheet, and then the battery diaphragm cast sheet is subjected to technological treatment such as stretching, extraction and the like to obtain the battery diaphragm. It is contemplated that improvements may be made to the battery separator processing equipment to provide the processed battery separator with improved structural strength.

Disclosure of Invention

The invention aims to provide battery diaphragm processing equipment, which aims to solve the problems that the battery diaphragm processed by the battery diaphragm processing equipment in the prior art has relatively low strength and is difficult to meet the requirement of high energy density of a battery; the invention also aims to provide a layering device for processing the battery diaphragm, which solves the problems.

The layering device for processing the battery diaphragm adopts the following technical scheme:

the battery diaphragm processing layering device comprises a layering unit arranged between an extruder and a die head, the layering unit comprises at least two melt channels for melt to enter so as to divide the melt into multiple layers, each melt channel is arranged along the thickness direction of the battery diaphragm, and the battery diaphragm processing layering device further comprises a cooling device for cooling the melt in the melt channels.

In order to facilitate the division of the melt, the layered unit in the scheme comprises at least three layered cutting plates which are detachably connected, and the melt passes through the interval between the adjacent layered cutting plates. The layered cutting plates can be detachably connected, and the number of the layered cutting plates can be conveniently increased or reduced according to needs so as to meet the requirements on the number of layers of different battery diaphragms.

For the processing of convenient layering baffle, in this scheme the layering cut board includes two linkage segments and the layering section of connecting two linkage segments, and the thickness of layering section is less than the thickness of linkage segment, and adjacent layering cut board passes through linkage segment stack connection and forms between the layering section the fuse-element passageway. Therefore, the layered units can only consist of the layered cutting plates which are connected with each other, and the structures of the layered cutting plates can be completely the same, thereby facilitating the processing design of the layered units.

For the equipment of convenient layering unit, wherein two layering division boards of constitution layering unit in this scheme are outer layering division board, other layering division boards are for pressing from both sides the interior layering division board of pressing from both sides between two outer layering division boards, the linkage segment thickness of outer layering division board is greater than the linkage segment thickness of interior layering division board, the layering segment thickness of outer layering division board also is greater than the layering segment thickness of interior layering division board, and the layering segment of outer layering division board is partial to one side setting of outer layering division board thickness direction, the middle part of layering division board thickness direction including the layering section setting of interior layering division board. Therefore, each inner layered partition plate can be designed into a symmetrical structure, and two sides of the inner plates of the layered partition plates are not required to be distinguished when the layered units are connected, so that the layered units are convenient to assemble.

In order to facilitate the installation of the layering units, one layering unit is arranged, and the number of the melt channels on the layering unit is equal to the set number of layers of the battery diaphragm. Therefore, the requirement of the number of layers of the battery diaphragm can be met by only installing one layering unit, and the layering unit is convenient to install.

In order to increase the structural strength of the battery diaphragm, the number of the layering units is at least two, each layering unit is arranged along the direction from the extruder to the die head, and the melt channels on the adjacent layering units are arranged in a staggered mode. The battery diaphragm is layered more than twice through the layering units, so that the interface structure of the battery diaphragm is increased, and the structural strength of the battery diaphragm is improved.

In order to conveniently cool the melt, the cooling device in the scheme comprises a cooling pipeline which is wound outside the layering unit and is used for cooling liquid to enter. Can cool off through pouring into the coolant liquid in cooling tube, cooling device is simple, convenient operation.

For the homogeneity of guaranteeing the battery diaphragm that the processing was processed, in this scheme the layering device is used in battery diaphragm processing still including being used for setting up the feed unit between extruder and layering unit, the feed unit outside is equipped with the heating device who heats the fuse-element, is equipped with the feed through hole that supplies the fuse-element to pass through on the feed unit, feed through hole's one end opening does feed unit's import, feed through hole's other end opening are feed unit's export, feed unit's import be used for with the export adaptation of die head adapter, feed unit's export and layering unit's import adaptation, and feed through hole arranges the size of direction at the fuse-element passageway of layering unit and increases to the export direction along feed unit's import gradually. Through the better and die head adapter adaptation of feed unit messenger's layering unit, guarantee that the flow of fuse-element is smooth and easy, avoid the fuse-element to pile up or layering unit internal fuse-element to cut off simultaneously, guaranteed battery separator's homogeneity.

For better messenger's layering unit and die head adaptation, in this scheme layering device is used in battery diaphragm processing still including being used for setting up the discharging unit between layering unit and die head, the discharging unit outside is equipped with the heating device who heats the fuse-element, is equipped with the discharging hole that the fuse-element that supplies the layering unit that flows out on the discharging unit passes through, discharging hole's one end opening does discharging unit's import, discharging hole's other end opening is discharging unit's export, discharging unit's import and layering unit's export adaptation, discharging unit's export be used for with the import adaptation of die head, and discharging hole reduces along discharging unit's import to export direction at the fuse-element passageway arrangement direction's of layering unit size gradually. The structure of the discharging unit can realize transitional connection between the layering unit and the die head, and the uniformity of the processed battery diaphragm is ensured.

The battery diaphragm processing equipment adopts the following technical scheme:

the battery diaphragm processing equipment comprises an extruder for melting raw materials of the battery diaphragm, a die head for extruding a melt, and a layering device arranged between the extruder and the die head, wherein the layering unit comprises at least two melt channels for the melt to enter so as to divide the melt into multiple layers, each melt channel is arranged along the thickness direction of the battery diaphragm, and the layering device further comprises a cooling device for cooling the melt in the melt channels.

In order to facilitate the division of the melt, the layered unit in the scheme comprises at least three layered cutting plates which are detachably connected, and the melt passes through the interval between the adjacent layered cutting plates. The layered cutting plates can be detachably connected, and the number of the layered cutting plates can be conveniently increased or reduced according to needs so as to meet the requirements on the number of layers of different battery diaphragms.

For the processing of convenient layering baffle, in this scheme the layering cut board includes two linkage segments and the layering section of connecting two linkage segments, and the thickness of layering section is less than the thickness of linkage segment, and adjacent layering cut board passes through linkage segment stack connection and forms between the layering section the fuse-element passageway. Therefore, the layered units can only consist of the layered cutting plates which are connected with each other, and the structures of the layered cutting plates can be completely the same, thereby facilitating the processing design of the layered units.

For the equipment of convenient layering unit, wherein two layering division boards of constitution layering unit in this scheme are outer layering division board, other layering division boards are for pressing from both sides the interior layering division board of pressing from both sides between two outer layering division boards, the linkage segment thickness of outer layering division board is greater than the linkage segment thickness of interior layering division board, the layering segment thickness of outer layering division board also is greater than the layering segment thickness of interior layering division board, and the layering segment of outer layering division board is partial to one side setting of outer layering division board thickness direction, the middle part of layering division board thickness direction including the layering section setting of interior layering division board. Therefore, each inner layered partition plate can be designed into a symmetrical structure, and two sides of the inner plates of the layered partition plates are not required to be distinguished when the layered units are connected, so that the layered units are convenient to assemble.

In order to facilitate the installation of the layering units, one layering unit is arranged, and the number of the melt channels on the layering unit is equal to the set number of layers of the battery diaphragm. Therefore, the requirement of the number of layers of the battery diaphragm can be met by only installing one layering unit, and the layering unit is convenient to install.

In order to increase the structural strength of the battery diaphragm, the number of the layering units is at least two, each layering unit is arranged along the direction from the extruder to the die head, and the melt channels on the adjacent layering units are arranged in a staggered mode. The battery diaphragm is layered more than twice through the layering units, so that the interface structure of the battery diaphragm is increased, and the structural strength of the battery diaphragm is improved.

In order to conveniently cool the melt, the cooling device in the scheme comprises a cooling pipeline which is wound outside the layering unit and is used for cooling liquid to enter. Can cool off through pouring into the coolant liquid in cooling tube, cooling device is simple, convenient operation.

For the homogeneity of guaranteeing the battery diaphragm who processes out, in this scheme the decker is still including setting up the feed unit between extruder and decker, the feed unit outside is equipped with the heating device who heats the fuse-element, is equipped with the feed through hole that supplies the fuse-element to pass through on the feed unit, feed through hole's one end opening does feed unit's import, feed through hole's other end opening are feed unit's export, feed unit's import and the export adaptation of die head adapter, feed unit's export and the import adaptation of decker, and feed through hole arranges the size of direction at the fuse-element passageway of decker and increases along feed unit's import to export direction gradually. Through the better and die head adapter adaptation of feed unit messenger's layering unit, avoid the junction between extruder, die head adapter and the layering unit etc. to appear the step, cause retentate, burnt yellow material, carbonization material etc. guarantee that the flow of fuse-element is smooth and easy to guarantee battery diaphragm's homogeneity.

For better messenger's layering unit and die head adaptation, in this scheme the layering device is still including setting up the discharging unit between layering unit and die head, the discharging unit outside is equipped with the heating device that heats the fuse-element, is equipped with the discharging hole that the fuse-element that supplies the layering unit that flows out passes through on the discharging unit, discharging hole's one end opening does discharging unit's import, discharging hole's other end opening are discharging unit's export, discharging unit's import and layering unit's export adaptation, discharging unit's export and the import adaptation of die head, and discharging hole arranges the size of direction and reduces along discharging unit's import to export direction at the fuse-element passageway of layering unit gradually. The discharging unit can realize transitional connection between the layering unit and the die head, so that the phenomenon that the layering unit, the discharging unit and the die head have steps to cause retentate, coke yellow material, carbonized material and the like is avoided, and smooth flowing of the melt is ensured, thereby ensuring the uniformity of the battery diaphragm.

The invention has the beneficial effects that: the layering unit is additionally arranged between the extruder and the die head, when a melt passes through the layering unit, the cooling device arranged outside the layering unit cools the melt, the melt is layered and cooled into a plurality of semi-solidified layers after passing through the layering unit, the semi-solidified layers flowing out of the layering unit are reheated and melted, and the interface layer is recombined. The battery diaphragm processed by the battery diaphragm processing equipment has weak interface layers, namely, polymer chains between adjacent interface layers are mutually crossed and connected to form an unobvious interface layer. The battery separator is added with a plurality of fiber layers in a microstructure manner, so that the stretching and puncturing performance of the battery separator can be obviously improved. Compared with a single-layer battery diaphragm, the strength of the battery diaphragm can be effectively improved by adding the interface layer on the battery diaphragm, so that the requirement of high energy density of a battery is met. The problem of among the prior art battery diaphragm processing equipment processed battery diaphragm intensity relatively lower, be difficult to satisfy battery high energy density requirement is solved.

Drawings

FIG. 1 is a cross-sectional view of a layering device for battery separator processing in an embodiment of the layering device for battery separator processing of the present invention;

FIG. 2 is a schematic view of the heating apparatus and the cooling apparatus of FIG. 1 with the heating apparatus and the cooling apparatus removed;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a partial cross-sectional view of FIG. 1 with the heating device and cooling device removed;

FIG. 5 is a schematic structural view of the inner segmented panel of FIG. 1;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is an enlarged view of a portion of FIG. 6 at B;

FIG. 8 is a left side view of FIG. 5;

in the figure: 1-feeding unit, 2-discharging unit, 3-layering unit, 4-bolt, 11-feeding heating plate, 12-feeding through hole, 13-adapter connecting hole, 21-discharging heating plate, 22-discharging through hole, 23-die head connecting hole, 31-outer layering cutting plate, 32-inner layering cutting plate, 33-cooling pipeline, 34-melt channel, 321-connecting hole, 322-connecting section and 323-layering section.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 to 4, the layering device for processing the battery separator comprises a feeding unit 1, a layering unit 3 and a discharging unit 2, wherein a feeding heating plate 11 and a discharging heating plate 21 for heating a melt are respectively arranged outside the feeding unit 1 and the discharging unit 2, a cooling pipeline 33 for allowing a cooling liquid to flow through and cooling the melt is arranged outside the layering unit 3, and the cooling liquid in the cooling pipeline 33 can be water or cooling oil. The feeding unit 1 and the discharging unit 2 are respectively provided with a feeding through hole 12 and a discharging through hole 22 for melt to pass through, the layering unit 3 comprises twelve layering cutting plates, two of the layering cutting plates are outer layering cutting plates 31, the rest are inner layering cutting plates 32 clamped between the outer layering cutting plates 31, and adjacent layering cutting plates form eleven melt channels 34 for melt to pass through. In other embodiments, a tube-in-tube radiator or a fin radiator or the like may be provided outside the layered unit to cool the layered unit; the heating plates on the feeding unit and the discharging unit can be replaced by built-in heating rods.

When the battery diaphragm is processed, the melt is extruded from the extruder and enters the feeding channel 12 of the feeding unit 1 through the die head adapter, and the melt is still in a molten state under the heating action of the feeding heating plate 11; then the melt enters the layering unit 3 from the feeding unit 1 and flows out from different melt channels 34 in a layering way under the action of a layering and cutting plate, the temperature in the layering unit 3 can be kept in a certain temperature range below the melting point temperature of the raw material of the battery diaphragm by a cooling pipeline 33 on the layering unit 3, the temperature of the cooling unit in the embodiment is 0-50 ℃ lower than the melting point temperature of polyolefin, for example, the raw material of the polyolefin of the battery diaphragm is polypropylene, and the temperature of the cooling unit is 0-50 ℃ lower than the melting point temperature of the polypropylene. Forming eleven semi-solidified layers through the layering unit 3; then the semi-solidified layers flow into the discharge through hole 22 of the discharge unit 2 from the layering unit 3, and the semi-solidified layers are re-melted and compounded under the heating action of the discharge heating plate 21 and extruded out from the die head. In other embodiments, the number of the layered plates on the layered unit can also be set as required to meet the requirements of different layers of the battery separator.

The battery diaphragm processed by the battery diaphragm processing equipment has weak interface layers, namely, polymer chains between adjacent interface layers are mutually crossed and connected to form an unobvious interface layer. The battery separator is added with a plurality of fiber layers in a microstructure manner, so that the stretching and puncturing performance of the battery separator can be obviously improved. Compared with a single-layer battery diaphragm, the strength of the battery diaphragm can be effectively improved by adding the interface layer on the battery diaphragm, so that the requirement of high energy density of a battery is met. The problem of among the prior art battery diaphragm processing equipment processed battery diaphragm intensity relatively lower, be difficult to satisfy battery high energy density requirement is solved.

It should be noted that smooth flow of the melt is ensured, so that uniformity of the battery diaphragm is ensured. In this embodiment, an opening at one end of the feed through hole 12 of the feed unit 1 is an inlet of the feed unit 1, an opening at the other end of the feed through hole 12 is an outlet of the feed unit 1, the inlet of the feed unit 1 is adapted to the outlet of the die adapter, the outlet of the feed unit 1 is adapted to the inlet of the lamination unit 3, and the size of the feed through hole 12 in the arrangement direction of the melt channel 34 of the lamination unit gradually increases along the direction from the inlet to the outlet of the feed unit 1. Similar to the feeding unit, in this embodiment, the one end opening of the discharging through hole 22 of the discharging unit 2 is the inlet of the discharging unit 2, the other end opening of the discharging through hole 22 is the outlet of the discharging unit 2, the inlet of the discharging unit 2 is matched with the outlet of the layering unit 3, the outlet of the discharging unit 2 is matched with the inlet of the die head, and the size of the discharging through hole 22 in the arrangement direction of the melt channel 34 of the layering unit 3 is gradually reduced along the inlet to the outlet direction of the discharging unit 2. Make the layering unit 3 better and die head adapter adaptation through feed unit 1, make layering unit 3 and die head adaptation through ejection of compact unit 2, avoid appearing the step between layering unit and extruder, the die head, cause retentate, burnt yellow material, carbonization material etc. and guarantee that the flow of fuse-element is smooth and easy to guarantee battery separator's homogeneity. In other embodiments, the feeding unit or the discharging unit may not be provided, and the layering unit is directly connected between the die adaptor and the die, and the inlet of the layering unit and the outlet of the layering unit are respectively processed into structures matched with the outlet of the die adaptor and the inlet of the die.

As shown in fig. 4, the feed unit 1 in this embodiment is provided with an adapter attaching hole 13 through which a bolt for connecting the die adapter with the feed unit 1 passes, and the discharge unit 2 is provided with a die attaching hole 23 through which a bolt for connecting the discharge unit 2 with the die passes. The feeding unit 1 and the discharging unit 2 are connected by bolts 4 and sandwich the layered unit between the feeding unit 1 and the discharging unit 2. The feeding unit 1 and the layering unit 3 are sealed through interference fit or a sealing element, and the discharging unit 2 and the layering unit 3 are sealed through interference fit or a sealing element; the sealing between the feeding unit 1 and the die head adapter and between the discharging unit 2 and the die head is ensured through corresponding structures. In other embodiments, the feeding unit, the layering unit and the discharging unit can be fixed by welding.

For the convenience to process the battery diaphragm of the different number of layers, different interlaminar thickness through battery diaphragm processing equipment, each layering of the layering unit cuts the equal releasable connection of board in this embodiment, and the fuse-element passes through from the interval between the adjacent layering cutting board. As shown in fig. 5 to 8, the inner layered partition plate 32 in this embodiment includes two connecting sections 322 and a layered section 323 connecting the two connecting sections 322, and the connecting sections 322 are provided with connecting holes 321 through which bolts connecting the layered partition plates pass. The thickness of the layered section 323 on the inner layered partition plate 32 is smaller than that of the connecting section 322, and the layered section 323 is located in the middle of the connecting section 322 in the thickness direction, so that a space for melt to pass through can be formed between the layered section 323 of the same inner layered partition plate and the layered sections 323 of the adjacent inner layered partition plates 32 on both sides. Similar to the structure of the inner divided plate 32, the outer divided plate 31 in this embodiment also includes two connecting sections and a divided section connecting the two connecting sections, and the thickness of the divided section is smaller than that of the connecting section. The difference from the inner divided plate 32 is that the layered section of the outer divided plate 31 is disposed to be offset to one side in the thickness direction of the connecting section.

In order to ensure the structural strength of the layered unit, the thicknesses of the connecting section and the layered section of the outer layered partition plate 31 in the present embodiment are respectively greater than the thicknesses of the connecting section and the layered section of the inner layered partition plate 32. Therefore, each inner layered partition plate 32 can be designed into a symmetrical structure, which is convenient for the design of the inner layered partition plate, and in addition, the two sides of the inner plates of the layered partition plates are not needed to be distinguished when the layered units are connected, thereby being convenient for the assembly of the layered units. In other embodiments, each of the layered split sheets may be secured by welding; the layered unit can also be a block structure, and a plurality of melt channels for melt to pass through are processed on the block structure; the layered sections on the layered cutting plates can also be arranged at one side deviated from the thickness direction of the connecting section, and a melt channel for a melt to pass through is arranged between the layered section of the same layer and the layered section of the adjacent layered cutting plate at one side and is in sealing fit with the layered section of the adjacent layered cutting plate at the other side; the structure of the outer layered cutting plate and the structure of the inner layered cutting plate can also be the same; the two outer layered cutting plates can be of a blocky structure, meanwhile, jacks for inserting the inner layered cutting plate are arranged on the outer layered cutting plates at intervals, and the inner layered cutting plate can be of a flat structure.

In other embodiments, more than two layered units can be arranged along the direction from the feeding device to the discharging device, and the melt channels on the adjacent layered units are arranged in a staggered manner. For example, two layering units can be provided, three melt channels for the melt to pass through are provided on the first layering unit adjacent to the feeding device, and six melt channels for the melt to pass through are provided on the second layering unit adjacent to the discharging device. The melt is now divided into three layers by the first layer-dividing unit and then into six layers by the second layer-dividing unit. Therefore, when the three layers of melts separated by the first layering unit pass through the second layering unit, the layers can be nested with each other, and the strength of the battery separator can be improved. In other embodiments, the number of layered units and the number of melt channels per layered unit may be set as desired.

The specific working process of the layering device for processing the battery diaphragm comprises the following steps: the inner layered cutting plate 32 and the outer layered cutting plate 31 are fastened through bolt connection to form a layered unit 3; the layering unit 3 is connected and fastened with the feeding unit 1 and the discharging unit 2 through bolts; the feeding unit 1 is connected with the die head adapter, so that an inlet of the feeding unit is matched with an outlet of the die head adapter, the discharging unit 2 is connected with the die head, so that an outlet of the discharging unit is matched with an inlet of the die head, and the installation of the layering device for processing the battery diaphragm is completed. The feeding unit and the discharging unit in the embodiment are basically symmetrical in structure. The melt flowing out of the extruder passes through the die head adapter, the feeding unit 1, the layering unit 3 and the discharging unit 2 in sequence, so that the melt forms an interface layer when passing through the layering device for battery separator processing. The method specifically comprises the following steps: when the melt passes through the feeding unit 1, the feeding heating plate 11 and the melt provide heat energy to ensure the fluidity of the melt; when the melt passes through the layering unit 3, the melt is cooled through the cooling pipeline 33, so that the melt forms a plurality of semi-solidified layers; and when the semi-solidified layer passes through the discharging unit 2, the melt is reheated by the heat energy provided by the discharging heating plate 21, and the melt with the interface layer is recombined together in the flowing process and extruded by the die head to obtain the battery diaphragm cast sheet. In the process of remelting and compounding semi-solidified layers, melt rolls between adjacent semi-solidified layers to enable polymer chains of polymers to be mutually cross-connected, which is equivalent to that a plurality of fiber layers are added on a battery diaphragm in terms of microstructure, so that the tensile and puncture properties of the battery diaphragm can be obviously improved.

In the specific embodiment of the battery diaphragm processing equipment, the battery diaphragm processing equipment comprises an extruder for melting raw materials of the battery diaphragm, a die head for extruding the melt, and a layering device arranged between the extruder and the die head, wherein the layering device has the same structure as the layering device for processing the battery diaphragm in the specific embodiment of the battery diaphragm processing layering device, and is not described in detail.