Battery separator processing apparatus and its delamination device

Abstract

This invention relates to battery separator processing equipment and its layering apparatus. The layering apparatus for battery separator processing includes a layering unit disposed between an extruder and a die. The layering unit includes at least two melt channels for entering the melt and dividing it into multiple layers. Each melt channel is arranged along the thickness direction of the battery separator. The layering apparatus also includes a cooling device for cooling the melt within the melt channels. Furthermore, the apparatus includes a discharge unit for connecting the layering unit and the die and heating and melting the melt flowing out of the layering unit. Microstructurally, this is equivalent to adding multiple fiber layers to the battery separator, thereby improving the overall performance of the battery separator. This solves the problem that battery separators processed by existing battery separator processing equipment have relatively low strength, making it difficult to meet the high energy density requirements of batteries.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery separator processing equipment and a layering device thereof. BACKGROUND

[0002] With the development of domestic electric vehicle technology, more and more battery enterprises have higher requirements for the energy density and volume density of the battery, so there are higher requirements for the strength and puncture performance of the battery separator. Research has found that, under the same thickness, the battery made of a battery separator with higher strength has a lower short circuit rate and better safety. At present, polyolefin battery separators are the main lithium battery separator materials, and the strength of the material itself has encountered a bottleneck in improving. The existing battery separator processing equipment includes an extruder and a die for extruding the melt. The battery separator raw material is melted and plasticized in the extruder to form a melt, and the melt is extruded from the die to obtain a battery separator cast sheet. The battery separator cast sheet is then subjected to stretching, extraction and other process treatments to obtain a battery separator. It can be considered to improve the battery separator processing equipment so that the processed battery separator has better structural strength. SUMMARY

[0003] The purpose of the present application is to provide a battery separator processing equipment to solve the problem that the battery separator processed by the battery separator processing equipment in the prior art has relatively low strength and is difficult to meet the high energy density requirements of the battery. The purpose of the present application is also to provide a layering device for battery separator processing to solve the above problems.

[0004] The layering device for battery separator processing of the present application adopts the following technical scheme:

[0005] The layering device for battery separator processing includes a layering unit arranged between the extruder and the die. The layering unit includes at least two melt channels for the melt to enter and a cooling device for cooling the melt in the melt channel. Each melt channel is arranged along the thickness direction of the battery separator. The cooling device cools the melt as it passes through the layering unit. After passing through the layering unit, the melt is layered and cooled into multiple semi-solid layers.

[0006] To facilitate the division of the melt, the layering unit in this scheme includes at least three layering cutting plates that can be detachably connected. The melt passes through the space between adjacent layering cutting plates. The layering cutting plates can be detachably connected, and the number of layering cutting plates can be easily increased or reduced as needed to adapt to the requirements of different battery separator layers.

[0007] In order to facilitate the processing of the layered partition, the layered partition in the scheme comprises two connecting sections and a layered section connecting the two connecting sections, and the thickness of the layered section is less than the thickness of the connecting section, and adjacent layered partitions are connected by the connecting section and form the melt channel between the layered sections. In this way, the layered unit can only consist of interconnected layered partitions, and the structure of each layered partition can be completely the same, facilitating the processing design of the layered unit.

[0008] In order to facilitate the assembly of the layered unit, two of the layered partitions constituting the layered unit are outer layered partitions, and the other layered partitions are inner layered partitions clamped between the two outer layered partitions. The thickness of the connecting section of the outer layered partition is greater than the thickness of the connecting section of the inner layered partition, and the thickness of the layered section of the outer layered partition is also greater than the thickness of the layered section of the inner layered partition. The layered section of the outer layered partition is arranged on one side of the thickness direction of the outer layered partition, and the layered section of the inner layered partition is arranged in the middle of the thickness direction of the inner layered partition. In this way, each inner layered partition can be designed as a symmetrical structure, and there is no need to distinguish the two sides of the inner plate of the layered partition when connecting the layered unit, facilitating the assembly of the layered unit.

[0009] In order to facilitate the installation of the layered unit, the layered unit is provided in the scheme, and the number of melt channels on the layered unit is equal to the number of battery membrane layers set. In this way, only one layered unit needs to be installed to meet the requirements of the number of battery membrane layers, and the installation of the layered unit is convenient.

[0010] In order to increase the structural strength of the battery membrane, at least two layered units are provided in the scheme, each layered unit is arranged along the direction from the extruder to the die, and the melt channels on adjacent layered units are arranged staggered. By using multiple layered units to layer the battery membrane more than twice, the interface structure of the battery membrane is increased, which is beneficial to the improvement of the structural strength of the battery membrane.

[0011] In order to facilitate the cooling of the melt, the cooling device in the scheme comprises a cooling pipeline arranged outside the layered unit for entering the cooling liquid. The cooling can be carried out by filling the cooling liquid in the cooling pipeline, and the cooling device is simple and convenient to operate.

[0012] To ensure the uniformity of the processed battery separator, the layered device for battery separator processing in the scheme further comprises a feeding unit arranged between the extruder and the layered unit, the outer side of the feeding unit is provided with a heating device for heating the melt, the feeding unit is provided with a feeding through hole for the melt to pass through, one end of the feeding through hole is the inlet of the feeding unit, the other end of the feeding through hole is the outlet of the feeding unit, the inlet of the feeding unit is adapted to the outlet of the die adapter, the outlet of the feeding unit is adapted to the inlet of the layered unit, and the size of the feeding through hole in the arrangement direction of the melt channel of the layered unit gradually increases in the direction from the inlet to the outlet of the feeding unit. The layered unit is better adapted to the die adapter through the feeding unit, the flow of the melt is smooth, the accumulation of the melt or the flow interruption of the melt in the layered unit is avoided, and the uniformity of the battery separator is ensured.

[0013] To better adapt the layered unit to the die, the layered device for battery separator processing in the scheme further comprises a discharging unit arranged between the layered unit and the die, the outer side of the discharging unit is provided with a heating device for heating the melt, the discharging unit is provided with a discharging through hole for the melt discharged from the layered unit to pass through, one end of the discharging through hole is the inlet of the discharging unit, the other end of the discharging through hole is the outlet of the discharging unit, the inlet of the discharging unit is adapted to the outlet of the layered unit, the outlet of the discharging unit is adapted to the inlet of the die, and the size of the discharging through hole in the arrangement direction of the melt channel of the layered unit gradually decreases in the direction from the inlet to the outlet of the discharging unit. The structure of the discharging unit can realize the transition connection between the layered unit and the die, and ensure the uniformity of the processed battery separator.

[0014] The battery separator processing equipment adopts the following technical scheme:

[0015] The battery separator processing equipment comprises an extruder for melting battery separator raw materials and a die for extruding the melt, and further comprises a layered device arranged between the extruder and the die, the layered device comprises a layered unit arranged between the extruder and the die, the layered unit comprises at least two melt channels for the melt to enter and a cooling device for cooling the melt in the melt channels, each melt channel is arranged in the thickness direction of the battery separator, the cooling device cools the melt when the melt passes through the layered unit, and the melt is divided into multiple layers after passing through the layered unit and being cooled to form multiple semi-solid layers. The layered device for battery separator processing further comprises a cooling device for cooling the melt in the melt channels.

[0016] In order to conveniently divide the melt, the layered unit comprises at least three layered cutting plates which are detachably connected, and the melt passes through the space between adjacent layered cutting plates. The layered cutting plates are detachably connected, and the number of layered cutting plates can be conveniently increased or reduced according to requirements to adapt to the requirements of different numbers of battery separator layers.

[0017] In order to conveniently process the layered separator, the layered cutting plate comprises two connecting sections and a layered section connecting the two connecting sections, and the thickness of the layered section is smaller than the thickness of the connecting section. Adjacent layered cutting plates are connected in layers through the connecting sections and form the melt channel between the layered sections. In this way, the layered unit can only consist of layered cutting plates connected to each other, and the structure of each layered cutting plate can be completely the same, which facilitates the processing and design of the layered unit.

[0018] In order to conveniently assemble the layered unit, two of the layered cutting plates constituting the layered unit are outer layered cutting plates, and the other layered cutting plates are inner layered cutting plates clamped between the two outer layered cutting plates. The thickness of the connecting section of the outer layered cutting plate is greater than the thickness of the connecting section of the inner layered cutting plate, and the thickness of the layered section of the outer layered cutting plate is also greater than the thickness of the layered section of the inner layered cutting plate. The layered section of the outer layered cutting plate is arranged on one side of the thickness direction of the outer layered cutting plate, and the layered section of the inner layered cutting plate is arranged in the middle of the thickness direction of the inner layered cutting plate. In this way, each inner layered cutting plate can be designed as a symmetrical structure, and there is no need to distinguish the two sides of the inner plate of the layered cutting plate when connecting the layered unit, which facilitates the assembly of the layered unit.

[0019] In order to conveniently install the layered unit, the layered unit is provided with one, and the number of melt channels on the layered unit is equal to the set number of battery separator layers. In this way, only one layered unit needs to be installed to meet the requirements of the number of battery separator layers, and the installation of the layered unit is convenient.

[0020] In order to increase the structural strength of the battery separator, the layered unit is provided with at least two, each layered unit is arranged along the direction from the extruder to the die, and the melt channels on adjacent layered units are arranged staggered. The battery separator is divided by the multiple layered units for more than twice, which increases the interface structure of the battery separator and is beneficial to the improvement of the structural strength of the battery separator.

[0021] In order to conveniently cool the melt, the cooling device comprises a cooling pipeline arranged outside the layered unit for the cooling liquid to enter. The cooling can be carried out by pouring the cooling liquid into the cooling pipeline, and the cooling device is simple and convenient to operate.

[0022] To ensure the uniformity of the processed battery separator, the layering device further comprises a feeding unit arranged between the extruder and the layering unit, the feeding unit is externally provided with a heating device for heating the melt, the feeding unit is provided with a feeding through hole for the melt to pass through, one end of the feeding through hole is the inlet of the feeding unit, the other end of the feeding through hole is the outlet of the feeding unit, the inlet of the feeding unit is matched with the outlet of the die adapter, the outlet of the feeding unit is matched with 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 in the direction from the inlet to the outlet of the feeding unit. The feeding unit better matches the layering unit with the die adapter, avoids steps between the extruder, the die adapter and the layering unit, causes residues, yellowing materials, carbonized materials and the like, ensures smooth flow of the melt, and thus ensures the uniformity of the battery separator.

[0023] To better match the layering unit with the die, the layering device further comprises a discharging unit arranged between the layering unit and the die, the discharging unit is externally provided with a heating device for heating the melt, the discharging unit is provided with a discharging through hole for the melt discharged from the layering unit to pass through, one end of the discharging through hole is the inlet of the discharging unit, the other end of the discharging through hole is the 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, and the size of the discharging through hole in the arrangement direction of the melt channel of the layering unit gradually decreases in the direction from the inlet to the outlet of the discharging unit. The discharging unit can realize the transition connection between the layering unit and the die, avoid steps between the layering unit, the discharging unit and the die, cause residues, yellowing materials, carbonized materials and the like, ensure smooth flow of the melt, and thus ensure the uniformity of the battery separator.

[0024] The battery separator processing equipment has the advantages that: the layering unit is arranged between the extruder and the die, the cooling device arranged outside the layering unit cools the melt when the melt passes through the layering unit, the melt is layered and cooled into a plurality of semi-solid layers after passing through the layering unit, the semi-solid layers discharged from the layering unit are reheated and melted, and the interface layers are recombined. The battery separator processed by the battery separator processing equipment has weak interface layers, that is, the polymer chains between adjacent interface layers are crosslinked and connected to each other to form unobvious interface layers. From the microstructure, a plurality of fiber layers are added to the battery separator, so that the tensile and puncture properties of the battery separator can be significantly improved. Compared with the single-layer battery separator, the strength of the battery separator can be effectively improved by adding the interface layers to the battery separator, so as to adapt to the requirement of high energy density of the battery. The problem that the strength of the battery separator processed by the battery separator processing equipment in the prior art is relatively low and is difficult to meet the requirement of high energy density of the battery is solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1A sectional view of the battery separator processing layering device in the embodiment of the battery separator processing layering device of the present application;

[0026] Figure 2 For Figure 1 Structure diagram without heating device and cooling device;

[0027] Figure 3 For Figure 2 Partial enlarged view at A in the middle;

[0028] Figure 4 For Figure 1 Partial sectional view without heating device and cooling device;

[0029] Figure 5 For Figure 1 Structure diagram of the inner layering cutting plate in the middle;

[0030] Figure 6 For Figure 5 Top view of the middle;

[0031] Figure 7 For Figure 6 Partial enlarged view at B in the middle;

[0032] Figure 8 For Figure 5 Left view of the middle;

[0033] 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 connecting hole, 31-outer layering cutting plate, 32-inner layering cutting plate, 33-cooling pipeline, 34-melt passage, 321-connecting hole, 322-connecting section, 323-layering section. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0035] The embodiment of the battery separator processing layering device of the present application, such as Figures 1 to 4As shown, the layered device for battery separator processing includes a feeding unit 1, a layered unit 3 and a discharging unit 2, the feeding unit 1 and the discharging unit 2 are respectively provided with a feeding heating plate 11 and a discharging heating plate 21 outside for heating the melt, and the layered unit 3 is provided with a cooling pipeline 33 outside for flowing cooling liquid to cool the melt, 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 the melt to pass through, and the layered unit 3 includes twelve layered cutting plates, two of which are outer layered cutting plates 31, and the rest are inner layered cutting plates 32 clamped between the outer layered cutting plates 31, and adjacent layered cutting plates form eleven melt channels 34 for the melt to pass through. In other embodiments, a pipe belt radiator or finned radiator can be provided outside the layered unit to cool the layered unit; the heating plates on the feeding unit and the discharging unit can also be replaced by built-in heating rods.

[0036] In the process of battery separator processing, the melt is extruded from the extruder and enters the feeding channel 12 of the feeding unit 1 through the die 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 layered unit 3 from the feeding unit 1 and is layered by the layered cutting plates to flow out from different melt channels 34, and the cooling pipeline 33 on the layered unit 3 can keep the temperature in the layered unit 3 within a certain temperature range at the melting point temperature of the battery separator raw material, and in this embodiment, the temperature of the cooling unit is 0-50℃ lower than the melting point temperature of the polyolefin, for example, if the polyolefin raw material of the battery separator is polypropylene, the temperature of the cooling unit is 0-50℃ lower than the melting point temperature of the polypropylene. Eleven semi-solid layers are formed through the layered unit 3; then the semi-solid layers flow into the discharging through hole 22 of the discharging unit 2 from the layered unit 3, and each layer of semi-solid layer is re-melted and compounded under the heating action of the discharging heating plate 21 and is extruded from the die. In other embodiments, the number of layered cutting plates on the layered unit can also be set according to the requirements to meet the requirements of different layers of battery separators.

[0037] The battery separator processed by the above battery separator processing equipment has a weak interface layer, that is, the polymer chains between adjacent interface layers are connected to each other, forming an unobvious interface layer. From the microstructure, it is equivalent to adding multiple fiber layers to the battery separator, thereby significantly improving the tensile and puncture performance of the battery separator. Compared with a single-layer battery separator, the strength of the battery separator can be effectively improved by adding an interface layer to the battery separator, thereby meeting the requirements of high energy density of the battery. The problem that the battery separator processed by the battery separator processing equipment in the prior art has relatively low strength and is difficult to meet the requirements of high energy density of the battery is solved.

[0038] It should be noted that the flow of the melt is smooth, thereby ensuring the uniformity of the battery separator. In this embodiment, the end of the feeding passage hole 12 of the feeding unit 1 is the inlet of the feeding unit 1, and the other end of the feeding passage hole 12 is the outlet of the feeding unit 1. The inlet of the feeding unit 1 is adapted to the outlet of the die adapter, the outlet of the feeding unit 1 is adapted to the inlet of the layering unit 3, and the size of the feeding passage hole 12 in the arrangement direction of the melt passage 34 of the layering unit gradually increases from the inlet to the outlet of the feeding unit 1. Similarly, in this embodiment, the end of the discharging passage hole 22 of the discharging unit 2 is the inlet of the discharging unit 2, and the other end of the discharging passage hole 22 is the outlet of the discharging unit 2. The inlet of the discharging unit 2 is adapted to the outlet of the layering unit 3, and the outlet of the discharging unit 2 is adapted to the inlet of the die. The size of the discharging passage hole 22 in the arrangement direction of the melt passage 34 of the layering unit 3 gradually decreases from the inlet to the outlet of the discharging unit 2. The layering unit 3 is better adapted to the die adapter through the feeding unit 1, and the layering unit 3 is adapted to the die through the discharging unit 2, thereby avoiding steps between the layering unit and the extruder and the die, causing stagnation, yellowing, carbonization, etc., and ensuring the smooth flow of the melt, thereby ensuring the uniformity of the battery separator. In other embodiments, the feeding unit or the discharging unit can not be provided, and the layering unit can be directly connected between the die adapter and the die, and the inlet of the layering unit and the outlet of the layering unit are respectively processed into structures adapted to the outlet of the die adapter and the inlet of the die.

[0039] As shown in Figure 4 The feeding unit 1 in this embodiment is provided with an adapter connecting hole 13 for the bolt connecting the die adapter and the feeding unit 1 to pass through, and the discharging unit 2 is provided with a die connecting hole 23 for the bolt connecting the discharging unit 2 and the die to pass through. The feeding unit 1 and the discharging unit 2 are connected by the bolt 4 and the layering unit is clamped between the feeding unit 1 and the discharging unit 2. It should be noted that the feeding unit 1 and the layering unit 3 are sealed by interference fit or sealing element, and the discharging unit 2 and the layering unit 3 are sealed by interference fit or sealing element. The feeding unit 1 and the die adapter, and the discharging unit 2 and the die also need to be sealed by corresponding structures. In other embodiments, the feeding unit, the layering unit and the discharging unit can be fixed by welding.

[0040] In order to facilitate the processing of battery separators with different layers and different layer thicknesses by the battery separator processing equipment, the layering cutting plates of the layering unit in this embodiment can be connected and disconnected, and the melt passes through the space between adjacent layering cutting plates. As shown in Figures 5 to 8As shown, the inner layered cutting plate 32 in the embodiment comprises two connecting sections 322 and a layered section 323 connecting the two connecting sections 322, and the connecting section 322 is provided with a connecting hole 321 for the bolt connecting the layered cutting plate to pass through. The thickness of the layered section 323 on the inner layered cutting plate 32 is smaller than the thickness of the connecting section 322, and the layered section 323 is in the middle of the thickness direction of the connecting section 322, so that the layered section 323 of the same inner layered cutting plate and the layered section 323 of the adjacent inner layered cutting plate 32 on both sides can form a gap for the melt to pass through. Similar to the structure of the inner layered cutting plate 32, the outer layered cutting plate 31 in the embodiment also comprises two connecting sections and a layered section connecting the two connecting sections, and the thickness of the layered section is smaller than the thickness of the connecting section. The difference from the inner layered cutting plate 32 is that the layered section of the outer layered cutting plate 31 is arranged on one side of the thickness direction of the connecting section.

[0041] In order to ensure the structural strength of the layered unit, the thickness of the connecting section and the layered section on the outer layered cutting plate 31 in the embodiment is greater than the thickness of the connecting section and the layered section on the inner layered cutting plate 32. In this way, each inner layered cutting plate 32 can be designed as a symmetrical structure, which is convenient for the design of the inner layered cutting plate, and in addition, when connecting the layered unit, it is not necessary to distinguish the two sides of the inner plate of the layered cutting plate, which is convenient for the assembly of the layered unit. In other embodiments, each layered cutting plate can be fixed by welding; the layered unit can also be a block structure, and a plurality of melt passages for the melt to pass through can be processed on the block structure; the layered section on the layered cutting plate can also be arranged on one side away from the thickness direction of the connecting section, at this time, the layered section of the same layer and the layered section of the layered cutting plate adjacent to one side have a melt passage for the melt to pass through, and the layered section of the layered cutting plate adjacent to the other side is sealed. The structure of the outer layered cutting plate can also be the same as that of the inner layered cutting plate; the two outer layered cutting plates can be a block structure, and a plurality of insertion holes for the inner layered cutting plate to be inserted are arranged on the outer layered cutting plate, at this time, the inner layered cutting plate can be designed as a flat plate structure.

[0042] In other embodiments, the layered unit can be arranged more than two along the direction from the feeding device to the discharging device, and the melt passages on the adjacent layered units are arranged staggered. For example, two layered units can be arranged, three melt passages for the melt to pass through are arranged on the first layered unit close to the feeding device, and six melt passages for the melt to pass through are arranged on the second layered unit close to the discharging device. At this time, the melt passing through the first layered unit is divided into three layers, and then is divided into six layers by the second layered unit. In this way, the three layers of melt divided by the first layered unit are beneficial to form mutual nesting when passing through the second layered unit, which is beneficial to the improvement of the strength of the battery separator. In other embodiments, the number of layered units and the number of melt passages on each layered unit can be arranged as needed.

[0043] The specific working process of the battery separator processing layering device of the application is as follows: the inner layering cutting plate 32 and the outer layering cutting plate 31 are fastened by bolt connection to form a layering unit 3; the layering unit 3 is fastened by bolt connection with the feeding unit 1 and the discharging unit 2; the feeding unit 1 is connected with the die adapter so that the inlet of the feeding unit is adapted to the outlet of the die adapter; the discharging unit 2 is connected with the die so that the outlet of the discharging unit is adapted to the inlet of the die, and the installation of the battery separator processing layering device is completed. The feeding unit and the discharging unit in the embodiment are basically symmetrical structures. The melt flowing out of the extruder passes through the die 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 battery separator processing layering device. Specifically, when the melt passes through the feeding unit 1, the feeding heating plate 11 and the melt itself provide heat energy to ensure the fluidity of the melt; when the melt passes through the layering unit 3, the melt is cooled by the cooling pipeline 33 to form multiple semi-solid layers; when the semi-solid 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 then is extruded by the die to obtain a battery separator cast piece. In the process of re-melting and re-combining of the semi-solid layer, the polymer polymerization chains of the melt rolling between adjacent semi-solid layers are cross-linked, which is equivalent to adding multiple fiber layers to the battery separator from the microstructure, thereby significantly improving the tensile and puncture performance of the battery separator.

[0044] The specific embodiment of the battery separator processing equipment of the application comprises an extruder for melting the battery separator raw material and a die for extruding the melt, and further comprises a layering device arranged between the extruder and the die, which has the same structure as the battery separator processing layering device in the specific embodiment of the battery separator processing layering device described above, and will not be described again.

Claims

1. A layering device for battery separator processing, characterized in that, It includes a layering unit disposed between an extruder and a die head. The layering unit includes at least two melt channels for melt to enter and a cooling device for cooling the melt in the melt channels. Each melt channel is arranged along the thickness direction of the battery separator. When the melt passes through the layering unit, the cooling device cools the melt. After passing through the layering unit, the melt is layered and cooled into multiple semi-solid layers.

2. The layering apparatus for battery separator processing according to claim 1, characterized in that, The layered unit includes at least three detachably connected layered cutting plates, through which the melt passes between adjacent layered cutting plates.

3. The layering apparatus for battery separator processing according to claim 2, characterized in that, The layered cutting plate includes two connecting sections and a layered section connecting the two connecting sections. The thickness of the layered section is less than the thickness of the connecting section. Adjacent layered cutting plates are connected by stacking the connecting sections and forming the melt channel between the layered sections.

4. The layering apparatus for battery separator processing according to claim 3, characterized in that, Two of the layered cutting plates that make up the layered unit are outer layered cutting plates, and the other layered cutting plates are inner layered cutting plates sandwiched between the two outer layered cutting plates. The thickness of the connecting section of the outer layered cutting plate is greater than the thickness of the connecting section of the inner layered cutting plate. The thickness of the layered section of the outer layered cutting plate is also greater than the thickness of the layered section of the inner layered cutting plate. The layered section of the outer layered cutting plate is set to one side in the thickness direction of the outer layered cutting plate, and the layered section of the inner layered cutting plate is set in the middle in the thickness direction of the inner layered cutting plate.

5. The layering apparatus for battery separator processing according to any one of claims 1-4, characterized in that, The layering unit is provided, and the number of melt channels on the layering unit is equal to the set number of battery separator layers.

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

7. The layering apparatus for battery separator processing according to any one of claims 1-4, characterized in that, The cooling device includes cooling pipes that are routed around the outside of the layered unit for coolant to enter.

8. The layering apparatus for battery separator processing according to any one of claims 1-4, characterized in that, The battery separator processing layering device further includes a feeding unit disposed between the extruder and the layering unit. The feeding unit is provided with a heating device for heating the melt on its outer side. The feeding unit is provided with a feeding through hole for the melt to pass through. One end of the feeding through hole is the inlet of the feeding unit, and the other end of the feeding through hole is the outlet of the feeding unit. The inlet of the feeding unit is adapted to the outlet of the die adapter, and the outlet of the feeding unit is adapted to the inlet of the layering unit. The size of the feeding through hole in the melt channel arrangement direction of the layering unit gradually increases from the inlet to the outlet of the feeding unit.

9. The layering apparatus for battery separator processing according to any one of claims 1-4, characterized in that, The layering device for battery separator processing also includes a discharge unit disposed between the layering unit and the die head. The discharge unit is provided with a heating device for heating the melt on its outer side. The discharge unit is provided with a discharge through hole for the melt flowing out of the layering unit to pass through. One end of the discharge through hole is the inlet of the discharge unit, and the other end of the discharge through hole is the outlet of the discharge unit. The inlet of the discharge unit is adapted to the outlet of the layering unit, and the outlet of the discharge unit is adapted to the inlet of the die head. The size of the discharge through hole in the melt channel arrangement direction of the layering unit gradually decreases from the inlet to the outlet of the discharge unit.

10. Battery separator processing equipment, comprising an extruder for melting battery separator raw materials and a die for extruding the melt, characterized in that, It also includes a layering device disposed between the extruder and the die head. The layering device includes a layering unit disposed between the extruder and the die head. The layering unit includes at least two melt channels for the melt to enter and a cooling device for cooling the melt in the melt channels. Each melt channel is arranged along the thickness direction of the battery separator. When the melt passes through the layering unit, the cooling device cools the melt. After passing through the layering unit, the melt is layered and cooled into multiple semi-solid layers.

11. The battery separator processing equipment according to claim 10, characterized in that, The layered unit includes at least three detachably connected layered cutting plates, through which the melt passes between adjacent layered cutting plates.

12. The battery separator processing equipment according to claim 11, characterized in that, The layered cutting plate includes two connecting sections and a layered section connecting the two connecting sections. The thickness of the layered section is less than the thickness of the connecting section. Adjacent layered cutting plates are connected by stacking the connecting sections and forming the melt channel between the layered sections.

13. The battery separator processing equipment according to claim 12, characterized in that, Two of the layered cutting plates that make up the layered unit are outer layered cutting plates, and the other layered cutting plates are inner layered cutting plates sandwiched between the two outer layered cutting plates. The thickness of the connecting section of the outer layered cutting plate is greater than the thickness of the connecting section of the inner layered cutting plate. The thickness of the layered section of the outer layered cutting plate is also greater than the thickness of the layered section of the inner layered cutting plate. The layered section of the outer layered cutting plate is set to one side in the thickness direction of the outer layered cutting plate, and the layered section of the inner layered cutting plate is set in the middle in the thickness direction of the inner layered cutting plate.

14. The battery separator processing equipment according to any one of claims 10-13, characterized in that, The layering unit is provided, and the number of melt channels on the layering unit is equal to the set number of battery separator layers.

15. The battery separator processing equipment according to any one of claims 10-13, characterized in that, The layering unit is provided in at least two, and each layering unit is arranged along the direction from the extruder to the die head, and the melt channels on adjacent layering units are staggered.

16. The battery separator processing equipment according to any one of claims 10-13, characterized in that, The cooling device includes cooling pipes that are routed around the outside of the layered unit for coolant to enter.

17. The battery separator processing equipment according to any one of claims 10-13, characterized in that, The battery separator processing layering device further includes a feeding unit disposed between the extruder and the layering unit. The feeding unit is provided with a heating device for heating the melt on its outer side. The feeding unit is provided with a feeding through hole for the melt to pass through. One end of the feeding through hole is the inlet of the feeding unit, and the other end of the feeding through hole is the outlet of the feeding unit. The inlet of the feeding unit is adapted to the outlet of the die adapter, and the outlet of the feeding unit is adapted to the inlet of the layering unit. The size of the feeding through hole in the melt channel arrangement direction of the layering unit gradually increases from the inlet to the outlet of the feeding unit.

18. The battery separator processing equipment according to any one of claims 10-13, characterized in that, The layering device for battery separator processing also includes a discharge unit disposed between the layering unit and the die head. The discharge unit is provided with a heating device for heating the melt on its outer side. The discharge unit is provided with a discharge through hole for the melt flowing out of the layering unit to pass through. One end of the discharge through hole is the inlet of the discharge unit, and the other end of the discharge through hole is the outlet of the discharge unit. The inlet of the discharge unit is adapted to the outlet of the layering unit, and the outlet of the discharge unit is adapted to the inlet of the die head. The size of the discharge through hole in the melt channel arrangement direction of the layering unit gradually decreases from the inlet to the outlet of the discharge unit.

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