An impact-resistant lithium-ion battery separator assembly and its installation method

Abstract

The present invention relates to the technical field of electrical components, and specifically to an impact-resistant lithium-ion battery separator assembly and its installation method. The assembly includes a lithium-ion battery separator and a storage assembly for winding and storing the lithium-ion battery separator. The storage assembly includes a winding core tube for winding the lithium-ion battery separator. One end of the winding core tube is inserted with a plug ring. The inner ring surface of the plug ring is inserted with a support block, and the inner ring opening of the plug ring is inserted with a limiting push ring. The limiting push ring squeezes the support block against the inner wall of the winding core tube to limit the plug ring in the winding core tube. The beneficial effect is that the impact-resistant lithium-ion battery separator assembly and its installation method proposed by the present invention realize the convenient installation and disassembly of the flexible protective cover inside the winding core tube through the design of structures such as the plug ring, the support block, and the limiting push ring. Users only need simple pushing and pulling operations to fix the flexible protective cover inside the winding core tube or pull it out for use, greatly improving the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical components, and particularly to an impact-resistant lithium-ion battery separator assembly and an installation method thereof. Background Art

[0002] During the production process of lithium-ion batteries, the lithium-ion battery separator is one of the key components. It is responsible for isolating the positive and negative electrodes of the battery to prevent direct contact from causing a short circuit, and at the same time allowing ions in the electrolyte to pass through to achieve the charge and discharge functions of the battery. In order to improve the performance and safety of lithium-ion batteries, various coating treatments are usually carried out on the separator, such as impact-resistant coatings, heat-resistant coatings, etc. However, these high-performance coated separators are prone to damage during storage and transportation, such as scratching, tearing, etc., which will affect the overall performance of the battery.

[0003] To solve this problem, the industry usually sets protective measures on the winding core tube for winding and storing lithium-ion battery separators. Traditional protective measures include wrapping a hard protective shell outside the winding core tube or using special packaging materials, but these methods have many inconveniences. The hard protective shell increases the volume and weight of the winding core tube, which is not conducive to storage and transportation; while special packaging materials require additional costs and need to handle waste after use, which is not conducive to environmental protection. Summary of the Invention

[0004] The purpose of the present invention is to provide an impact-resistant lithium-ion battery separator assembly and an installation method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An impact-resistant lithium-ion battery separator assembly includes a lithium-ion battery separator and a storage assembly for winding and storing the lithium-ion battery separator. The battery separator body is composed of a base film, a polymer coating coated on one side of the base film, and an inorganic particle coating coated on the other side of the base film. The polymer coating includes an aramid coating and a PBT coating. The aramid coating is provided on one side of the base film, and the PBT coating is provided on the side of the aramid coating away from the PBT coating;

[0006] The storage assembly includes a winding core tube for winding the lithium-ion battery separator. One end of the winding core tube is inserted with a plug ring. The inner ring surface of the plug ring is inserted with a support block, and a limiting push ring is inserted into the inner ring opening of the plug ring. The limiting push ring squeezes the support block against the inner wall of the winding core tube to limit the plug ring in the winding core tube. One end of the plug ring extending into the winding core tube is fixed with an inner partition tube. A flexible protective cover is provided between the inner partition tube and the winding core tube. One end of the flexible protective cover is fixed to one end of the plug ring, and the other end of the flexible protective cover is fixed with a rubber ring. After the flexible protective cover is pulled out and turned over, it is sleeved on the lithium-ion battery separator. At this time, the rubber ring is sleeved outside the retaining ring, and the retaining ring is fixed to the other end of the plug ring.

[0007] Preferably, the plug ring is in the structure of an annular plate with an "L"-shaped cross-section, and the retaining ring is an annular plate. A first clamping groove is formed on the outer ring surface of the retaining ring. The first clamping groove is an annular groove for limiting the rubber ring at the end of the unfolded flexible protective cover.

[0008] Preferably, an embedding groove is formed on the outer ring surface of the plug ring. The embedding groove is an annular groove, and a first through hole is formed on the surface of the embedding groove. There are multiple first through holes, and the multiple first through holes are circumferentially distributed with the plug ring as the central axis. The supporting block is movably inserted into the first through hole. The plate length of the supporting block is greater than the depth of the first through hole. One end of the first through hole extending into the embedding groove is fixed to the inner ring surface of the elastic band. The elastic band is in an annular structure, and both ends of the elastic band are respectively fixed to two parallel side walls of the embedding groove.

[0009] Preferably, the other end of the supporting block is provided with an inclined surface facing the retaining ring. An avoidance groove is formed on the outer ring surface of the limiting push ring away from the retaining ring. The avoidance groove is an annular groove, and the depth of the avoidance groove is equal to the length of the plate of the supporting block minus the depth of the first through hole.

[0010] Preferably, an introduction ring is fixed to the end of the limiting push ring away from the retaining ring. The introduction ring is an annular plate. After the limiting push ring squeezes the supporting block against the inner ring surface of the winding core tube, one end of the introduction ring is inserted into the second clamping groove. The second clamping groove is an annular groove with a spherical fracture. A rubber sleeve ring is sleeved on one end of the introduction ring. The rubber sleeve ring is in the structure of an annular plate with a spherical cross-section, and the rubber sleeve ring is elastically deformed when clamped between the second clamping groove and the introduction ring.

[0011] Preferably, a picking groove is formed on the inner ring surface of the limiting push ring. The picking groove is an annular groove. A retaining piece is fixed to the inner ring surface of the plug ring. The retaining piece is in the structure of an annular plate, and the retaining piece is used for limiting the limiting push ring to prevent the limiting push ring from being completely pulled out from the picking groove.

[0012] Preferably, the tube length of the inner partition tube is less than the tube length of the winding core tube. An annular storage groove is formed between the outer ring surface of the inner partition tube and the inner ring surface of the winding core tube for storing the flexible protective cover. A limiting ring is fixed to the end of the inner partition tube away from the plug ring. The limiting ring is in the structure of an annular plate with an "L"-shaped cross-section. After the flexible protective cover is folded and stuffed into the annular storage groove, the rubber ring is sleeved on the limiting ring.

[0013] Preferably, two second through holes are formed on the inner ring surface of the inner partition tube. The two second through holes are symmetrically distributed with respect to the tube orifice of the inner partition tube. A clamping block is inserted into the second through hole. The plate length of the clamping block is greater than the distance between the outer ring surface of the inner partition tube and the inner ring surface of the winding core tube. One end of the clamping block extending into the inner part of the tube orifice of the inner partition tube is provided with a third through hole. An elastic piece is fixed to the surface of the third through hole. Both ends of the elastic piece are fixed to the inner ring surface of the inner partition tube, and both ends of the elastic piece are respectively distributed on both sides of the second through hole.

[0014] Preferably, a limiting groove is formed on the inner ring surface of the winding core tube. The limiting groove is an annular groove. When the elastic piece is in the initial state, one end of the clamping block extends into the limiting groove, and a part of the flexible protective cover is clamped in the limiting groove by the clamping block, so as to prevent the flexible protective cover between the clamping block and the plug ring from being pulled.

[0015] An installation method of an impact-resistant lithium-ion battery separator, which applies an impact-resistant lithium-ion battery separator assembly, the method comprising the following steps:

[0016] Placing the negative electrode case: Place the battery negative electrode metal case flat on the operating table;

[0017] Inserting the components: Insert a metal spring piece, a metal gasket and a metal lithium piece into the negative electrode case in sequence, ensuring that the central positions of these components coincide;

[0018] Dropping the electrolyte: Use a pipette or a dropper to suck an appropriate amount of electrolyte, 1 mol / L LiPF6 dissolved in a 1:1 mixture of ethylene carbonate and dimethyl carbonate, and add 5% fluoroethylene carbonate, and drop it onto the center of the lithium piece to ensure that the electrolyte wets the lithium piece;

[0019] Placing the separator: Use insulating tweezers to pick up the cut lithium-ion battery separator and place it on top of the lithium piece. The central position of the lithium-ion battery separator should coincide with that of the lithium piece. The main function of the lithium-ion battery separator is to prevent the positive and negative electrodes from directly contacting and causing a short circuit, and to allow ions in the electrolyte to pass through;

[0020] Dropping the electrolyte again: Drop an appropriate amount of electrolyte on the lithium-ion battery separator again to ensure that the lithium-ion battery separator is fully wetted;

[0021] Placing the electrode plate: Place the electrode plate on top of the lithium-ion battery separator, ensuring that the central position of the electrode plate coincides with that of the lithium-ion battery separator;

[0022] Assembling the positive electrode case: Cover the positive electrode case on top of the electrode plate, and insert a steel sheet and a spring piece assembly in sequence, ensuring that all components are tightly combined;

[0023] Encapsulating the battery: Place the entire button battery on the encapsulator for encapsulation. The encapsulation pressure should be adjusted according to the specific battery model and the requirements of the encapsulator to ensure the stability of the internal physical and chemical environment of the battery;

[0024] Letting the battery stand: After encapsulation, take out the battery and let it stand for 10 - 12 hours to ensure that the electrolyte is fully wetted with the positive and negative electrode materials of the battery, so as to carry out subsequent electrochemical performance tests.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The proposed impact-resistant lithium-ion battery separator assembly and its installation method realize the convenient installation and disassembly of the flexible protective cover inside the winding core tube by designing structures such as the plug ring, support block, and limit push ring. Users only need simple pushing and pulling operations to fix the flexible protective cover inside the winding core tube or pull it out for use, greatly improving the operation efficiency.

[0027] Through structures such as rubber rings and card slots, the flexible protective cover can be firmly sleeved on the lithium-ion battery separator, effectively preventing the separator from being scratched, torn, etc. during storage and transportation. At the same time, the material and design of the flexible protective cover also ensure its stability and durability in different environments.

[0028] Since the flexible protective cover can be hidden inside the winding core tube when not needed, it does not increase additional storage space. This is a significant advantage for the storage and transportation of lithium-ion batteries, especially in situations where space is limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the present invention;

[0030] Figure 2 is a side view of the structure of the present invention;

[0031] Figure 3 is Figure 2 a sectional view of the structure at A-A in

[0032] Figure 4 is Figure 3 an enlarged schematic diagram of the structure at A in

[0033] Figure 5 is Figure 3 an enlarged schematic diagram of the structure at B in

[0034] Figure 6 is a schematic diagram of the connection structure of the plug ring and the inner spacer tube of the present invention;

[0035] Figure 7 is a schematic diagram of the limit push ring structure of the present invention;

[0036] Figure 8 is a schematic diagram of the clip block structure of the present invention;

[0037] Figure 9 is a schematic diagram of the structure after the flexible protective cover of the present invention covers the outside of the lithium-ion battery separator;

[0038] Figure 10 is Figure 9 a side view of the structure in

[0039] Figure 11 is Figure 10 a sectional view of the structure at B-B in

[0040] Figure 12 is Figure 11 The enlarged schematic diagram of the structure at position C in

[0041] Figure 13 is the schematic diagram of the structure of the lithium-ion battery separator of the present invention;

[0042] Figure 14 is Figure 13 The top view of the structure in

[0043] Figure 15 is Figure 14 The sectional view of the structure at C-C in

[0044] Figure 16 is Figure 15 The enlarged schematic diagram of the structure at position D in

[0045] In the figure: PBT coating 1, aramid coating 2, base film 3, inorganic particle coating 4, lithium-ion battery separator 5, winding core tube 6, plug ring 7, retaining ring 8, first card slot 9, embedding slot 10, first through hole 11, elastic band 12, support block 13, inclined surface 14, limiting push ring 15, avoidance groove 16, picking groove 17, guiding ring 18, second card slot 19, rubber sleeve ring 20, retaining piece 21, inner partition tube 22, limiting ring 23, second through hole 24, clamping block 25, limiting groove 26, third through hole 27, elastic piece 28, flexible protective cover 29, rubber ring 30. Specific embodiments

[0046] In order to clearly and completely describe the purpose, technical solution of the present invention, and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0047] Embodiment 1, please refer to Figures 13 to 16 , the present invention provides a technical solution: an impact-resistant lithium-ion battery separator assembly, including a lithium-ion battery separator 5 and a storage assembly for winding and storing the lithium-ion battery separator 5. The battery separator body is composed of a base film 3, a polymer coating applied to one side of the base film 3, and an inorganic particle coating 4 applied to the other side of the base film 3. The polymer coating includes an aramid coating 2 and a PBT coating 1. The aramid coating 2 is provided on one side of the base film 3, and the PBT coating 1 is provided on the side of the aramid coating 2 away from the PBT coating 1.

[0048] The polymer coating is composed of an aramid coating 2 coated on a base film 3 and a PBT coating 1 coated on the aramid coating 2, and the thickness of the polymer coating is 0.3 - 5 μm. The aramid coating 2 in the polymer coating is obtained by coating, soaking in water, and drying the aramid coating solution, and the thickness of the aramid coating 2 is 0.2 - 3 μm; the PBT coating 1 in the polymer coating is obtained by coating and drying the PBT coating solution, and the thickness of the PBT coating 1 is 0.1 - 2 μm. The aramid coating solution is composed of the following substances in parts by mass: 3 - 10 parts of aramid fiber, 60 - 87 parts of solvent, 3 - 5 parts of co-solvent, 0.5 - 1 part of dispersant, 0.5 - 2 parts of emulsifier, and 1 - 2 parts of polymer binder. The inorganic particle coating 4 is composed of inorganic particles with different particle sizes and a binder, and the thickness of the inorganic particle coating 4 is 0.5 - 5 μm. The inorganic particle coating 4 is obtained by coating and drying the inorganic particle coating solution.

[0049] Due to the existence of the aramid coating 2, the roughness increases, so that the adhesion between the aramid coating 2 and the PBT coating 1 and between the polymer coating and the base film 3 is tighter and not easy to fall off. Moreover, due to the existence of the PBT coating 1, the base film 3 has better impact resistance and improves the safety of the battery; the inorganic particles with different particle sizes are arranged more closely with each other, adhere more tightly to the base film 3, the inorganic particle coating 4 is not easy to fall off, and adheres more tightly to the electrode sheet. In addition to the good heat resistance and mechanical properties of the aramid coating 2, the composite separator also has the good electrochemical properties of the PBT coating 1. In addition, the inorganic particles with different particle sizes can form a tighter bond and are not easy to fall off. The surface coating formed by the inorganic particles absorbs more electrolyte by capillary action and stores it in the separator, which is beneficial to improving the stability of the lithium-ion battery separator 5 during high-rate charge and discharge and the rate performance of the battery. At the same time, due to the excellent heat resistance of the inorganic particle coating and its certain hardness, it can prevent the perforation and damage of the separator during the growth of lithium dendrites.

[0050] Example 2, referring to the appendix Figures 1 to 12, on the basis of the first embodiment, it is further proposed that the storage component includes a winding core tube 6 for winding the lithium-ion battery separator 5. One end of the winding core tube 6 is inserted with a plug ring 7. The inner ring surface of the plug ring 7 is inserted with a support block 13, and the inner ring opening of the plug ring 7 is inserted with a limiting push ring 15. The limiting push ring 15 squeezes and pushes the support block 13 against the inner wall of the winding core tube 6 to limit the plug ring 7 in the winding core tube 6; the plug ring 7 has a circular ring plate structure with an "L"-shaped cross-section, and the retaining ring 8 is a circular ring plate. The outer ring surface of the retaining ring 8 is provided with a first card slot 9, and the first card slot 9 is an annular groove for limiting the rubber ring 30 at the end of the unfolded flexible protective cover 29; the outer ring surface of the plug ring 7 is provided with an embedding groove 10, and the embedding groove 10 is an annular groove. The surface of the embedding groove 10 is provided with a first through hole 11. There are multiple first through holes 11, and the multiple first through holes 11 are circumferentially distributed with the plug ring 7 as the central axis. The support block 13 is movably inserted into the first through hole 11. The plate length of the support block 13 is greater than the depth of the first through hole 11. One end of the first through hole 11 extending into the embedding groove 10 is fixed to the inner ring surface of the elastic band 12. The elastic band 12 has an annular structure, and both ends of the elastic band 12 are respectively fixed to two parallel side walls of the embedding groove 10; the other end of the support block 13 is provided with an inclined surface 14 facing the retaining ring 8. The outer ring surface of the limiting push ring 15 away from the retaining ring 8 is provided with an avoidance groove 16, and the avoidance groove 16 is an annular groove. The depth of the avoidance groove 16 is equal to the length of the plate of the support block 13 minus the depth of the first through hole 11.

[0051] During use, the structures inserted into the inner side of the winding core tube 6 are all detachable and selectable structures; during installation, the plug ring 7 is inserted into the winding core tube 6. At this time, the retaining ring 8 is blocked at the end of the winding core tube 6, and the inner spacer tube 22 follows the plug ring 7 and is inserted into the winding core tube 6. In order to prevent the plug ring 7 from falling off the winding core tube 6, the limiting push ring 15 is pushed to squeeze the support block 13. When the support block 13 moves, it stretches the elastic band 12 to generate elastic deformation, and the support block 13 presses the elastic band 12 against the inner ring surface of the winding core tube 6 to increase the friction between the support block 13 and the winding core tube 6, and the support block 13 tightly presses against the inner ring side of the winding core tube 6, thereby braking the plug ring 7 in the winding core tube 6 and preventing the plug ring 7 from sliding out of the winding core tube 6; when it is necessary to remove the plug ring 7 from the winding core tube 6, the finger reaches into the picking groove 17 and stretches the limiting push ring 15 to move towards the retaining ring 8 until the avoidance groove 16 corresponds to the first through hole 11. Since a step is formed between the avoidance groove 16 and the outer ring surface of the limiting push ring 15, the elastic band 12 rebounds and pulls the support block 13 to move towards the avoidance groove 16. At this time, the support block 13 no longer presses against the inner ring side of the winding core tube 6, that is, the plug ring 7 is no longer braked, and the plug ring 7 can be pulled out of the winding core tube 6. The reason for installing the retaining piece 21 at the inner ring opening of the plug ring 7 is to prevent the limiting push ring 15 from being completely pulled out of the plug ring 7.

[0052] One end of the limit push ring 15 away from the retaining ring 8 is fixed with an introduction ring 18. The introduction ring 18 is an annular plate. After the limit push ring 15 squeezes the support block 13 against the inner ring surface of the winding core tube 6, one end of the introduction ring 18 is inserted into the second card slot 19. The second card slot 19 is a circular ring groove with a spherical fracture. One end of the introduction ring 18 is sleeved with a rubber sleeve ring 20. The rubber sleeve ring 20 is a ring plate structure with a spherical cross-section. The rubber sleeve ring 20 is clamped between the second card slot 19 and the introduction ring 18 and generates elastic deformation; an extraction groove 17 is formed on the inner ring surface of the limit push ring 15. The extraction groove 17 is an annular groove. A retaining piece 21 is fixed on the inner ring surface of the plug ring 7. The retaining piece 21 is an annular plate structure. The retaining piece 21 is used to limit the limit push ring 15 and prevent the limit push ring 15 from being completely pulled out from the extraction groove 17.

[0053] During use, the reason for installing the introduction ring 18 at the end of the limit push ring 15 is that when the limit push ring 15 squeezes and limits the support block 13, the introduction ring 18 pushes the rubber sleeve ring 20 into the second card slot 19, that is, the limit push ring 15 will not slide randomly at this time, so as to ensure that the limit push ring 15 stably limits the support block 13.

[0054] One end of the plug ring 7 extending into the winding core tube 6 is fixed with an inner partition tube 22. A flexible protective cover 29 is arranged between the inner partition tube 22 and the winding core tube 6. One end of the flexible protective cover 29 is fixed at one end of the plug ring 7. The other end of the flexible protective cover 29 is fixed with a rubber ring 30. After the flexible protective cover 29 is pulled out and turned over, it is sleeved on the lithium-ion battery separator 5. At this time, the rubber ring 30 is sleeved on the outside of the retaining ring 8. The retaining ring 8 is fixed at the other end of the plug ring 7; the tube length of the inner partition tube 22 is less than the tube length of the winding core tube 6. An annular storage groove is formed between the outer ring surface of the inner partition tube 22 and the inner ring surface of the winding core tube 6 for storing the flexible protective cover 29. One end of the inner partition tube 22 away from the plug ring 7 is fixed with a limit ring 23. The limit ring 23 is a circular ring plate structure with an "L" - shaped cross-section. After the flexible protective cover 29 is folded and stuffed into the annular storage groove, the rubber ring 30 is sleeved on the limit ring 23; two through holes 24 are formed on the inner ring surface of the inner partition tube 22. The two through holes 24 are symmetrically distributed about the pipe orifice of the inner partition tube 22. A clamping block 25 is inserted into the inside of the through hole 24. The plate length of the clamping block 25 is greater than the distance between the outer ring surface of the inner partition tube 22 and the inner ring surface of the winding core tube 6. One end of the clamping block 25 extending into the inside of the pipe orifice of the inner partition tube 22 is provided with a through hole 27. A elastic sheet 28 is fixed on the surface of the through hole 27. Both ends of the elastic sheet 28 are fixed on the inner ring surface of the inner partition tube 22, and both ends of the elastic sheet 28 are respectively distributed on both sides of the through hole 24; a limit groove 26 is formed on the inner ring surface of the winding core tube 6. The limit groove 26 is an annular groove. When the elastic sheet 28 is in the initial state, one end of the clamping block 25 extends into the limit groove 26, and a part of the flexible protective cover 29 is clamped by the clamping block 25 in the limit groove 26, so as to prevent the flexible protective cover 29 between the clamping block 25 and the plug ring 7 from being pulled.

[0055] During use, the flexible protective cover 29 is installed to, after the lithium-ion battery separator 5 is wound around the winding core tube 6, pull out the flexible protective cover 29 from between the inner spacer tube 22 and the winding core tube 6, then fold the pulled-out flexible protective cover 29 and sleeved it on the lithium-ion battery separator 5. The pulling distance of the flexible protective cover 29 is such that after the flexible protective cover 29 is folded and sleeved on the lithium-ion battery separator 5, the rubber ring 30 can be sleeved in the first clamping groove 9. At this time, the flexible protective cover 29 wraps and protects the lithium-ion battery separator 5, preventing the lithium-ion battery separator 5 from being scratched after exposure, and there is no need to specially prepare other protective structures, that is, the flexible protective cover 29 hidden and stored inside the winding core tube 6 can be used.

[0056] It should be noted that when pulling the flexible protective cover 29 outwards from between the inner spacer tube 22 and the winding core tube 6, two fingers are respectively inserted into the through holes three 27 on the surfaces of the two clamping blocks 25, the two fingers are closed, and the tensioned clamping blocks 25 move along the corresponding through holes two 24 into the inner spacer tube 22. One end of the clamping block 25 is pulled out from the limiting groove 26, and the clamping block 25 tensions the elastic piece 28 to generate elastic deformation. After the clamping block 25 is pulled out from the limiting groove 26, the flexible protective cover 29 is no longer clamped and limited, and the flexible protective cover 29 can be pulled. When the pulled length of the flexible protective cover 29 meets the requirements, release the clamping block 25, and the elastic piece 28 rebounds to pull the clamping block 25 back. One end of the clamping block 25 extends into the limiting groove 26, and at this time, a part of the flexible protective cover 29 is clamped by the clamping block 25 in the limiting groove 26, preventing the flexible protective cover 29 from being pulled outwards continuously, that is, preventing the un-pulled flexible protective cover 29 between the clamping block 25 and the plug ring 7 from being pulled.

[0057] Embodiment 3, based on Embodiment 2, proposes an installation method for an impact-resistant lithium-ion battery separator, and an impact-resistant lithium-ion battery separator assembly is applied. The method includes the following steps:

[0058] Placing the negative electrode case: Place the battery negative electrode metal case flat on the operating table;

[0059] Inserting the components: Sequentially insert a metal spring sheet, a metal gasket, and a metal lithium sheet into the negative electrode case, ensuring that the central positions of these components coincide;

[0060] Dropping the electrolyte: Use a pipette or a dropper to suck an appropriate amount of electrolyte, 1 mol / L LiPF6 dissolved in a 1:1 mixture of ethylene carbonate and dimethyl carbonate, and add 5% fluoroethylene carbonate, and drop it onto the center of the lithium sheet to ensure that the electrolyte wets the lithium sheet;

[0061] Placing the separator: Use insulating tweezers to pick up the cut lithium-ion battery separator 5 and place it on top of the lithium sheet. The center position of the lithium-ion battery separator 5 should coincide with the lithium sheet. The main function of the lithium-ion battery separator 5 is to prevent direct contact between the positive and negative electrodes from causing a short circuit and to allow ions in the electrolyte to pass through;

[0062] Adding electrolyte again: Drop an appropriate amount of electrolyte on the lithium-ion battery separator 5 again to ensure that the lithium-ion battery separator 5 is fully wetted;

[0063] Placing the electrode plate: Place the electrode plate on top of the lithium-ion battery separator 5 to ensure that the center position of the electrode plate coincides with the lithium-ion battery separator 5;

[0064] Assembling the positive electrode case: Cover the positive electrode case on the electrode plate and sequentially place the steel sheet and the shrapnel assembly to ensure that all components are tightly combined;

[0065] Encapsulating the battery: Place the entire button battery on the encapsulator for encapsulation. The encapsulation pressure should be adjusted according to the specific battery model and the requirements of the encapsulator to ensure the stability of the physical and chemical environment inside the battery;

[0066] Letting the battery stand: After encapsulation, take out the battery and let it stand for 10 - 12 hours to ensure that the electrolyte is fully wetted with the positive and negative electrode materials of the battery, so as to conduct subsequent electrochemical performance tests.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An impact-resistant lithium-ion battery separator assembly, comprising a lithium-ion battery separator and a storage assembly for winding and storing the lithium-ion battery separator, characterized in that: The battery separator body comprises a base film, a polymer coating coated on one side of the base film, and an inorganic particle coating coated on the other side of the base film, wherein the polymer coating comprises an aramid coating and a PBT coating, wherein the aramid coating is disposed on one side of the base film, and the PBT coating is disposed on a side of the aramid coating away from the PBT coating; The storage component includes a winding core tube for winding the lithium-ion battery diaphragm, a plug ring is inserted at one end of the winding core tube, a support block is inserted at the inner ring surface of the plug ring, and a limited push ring is inserted at the inner ring opening of the plug ring, the limited push ring pushes the support block against the inner wall of the winding core tube, and is used to limit the plug ring in the winding core tube, an inner spacer tube is fixed at one end of the plug ring extending into the winding core tube, a flexible protective cover is provided between the inner spacer tube and the winding core tube, one end of the flexible protective cover is fixed to one end of the plug ring, and a rubber ring is fixed to the other end of the flexible protective cover, the flexible protective cover is pulled out and turned over and sleeved on the lithium-ion battery diaphragm, at this time the rubber ring is sleeved on the outside of the retaining ring, and the retaining ring is fixed to the other end of the plug ring; The plug ring is a circular plate structure with an "L"-shaped cross section, the retaining ring is a circular plate, and a clamping groove 1 is provided on the outer ring surface of the retaining ring. The clamping groove 1 is an annular groove and is used to limit the rubber ring at the end of the flexible protective cover after the expansion; an introduction ring is fixed on the end of the limiting push ring away from the retaining ring. The introduction ring is an annular plate. After the limiting push ring pushes the support block against the inner ring surface of the winding core tube, one end of the introduction ring is inserted into the clamping groove 2. The clamping groove 2 is a circular ring groove with a spherical cross section. A rubber ring is sleeved on one end of the introduction ring. The rubber ring is a ring plate structure with a spherical cross section. The rubber ring is clamped between the clamping groove 2 and the introduction ring to produce elastic deformation.

2. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The outer ring surface of the plug ring is provided with an embedding groove in the form of an annular groove, and the surface of the embedding groove is provided with a through-opening one, and there are multiple through-openings one, and the multiple through-openings one are distributed in a circle with the plug ring as the central axis. The support block is movably inserted in the through-opening one, and the plate length of the support block is greater than the depth of the through-opening one. One end of the through-opening one extending into the embedding groove is fixed on the inner ring surface of the elastic band. The elastic band is in an annular structure, and the two ends of the elastic band are respectively fixed on two parallel side walls of the embedding groove.

3. The impact-resistant lithium-ion battery separator assembly according to claim 2, characterized in that: The other end of the support block is provided with an inclined surface, which faces the retaining ring. An avoidance groove is provided on the outer ring surface of the end of the limit push ring away from the retaining ring. The avoidance groove is an annular groove, and the depth of the avoidance groove is equal to the length of the support block plate minus the length of the penetration depth.

4. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The inner ring surface of the limit push ring is provided with a pick-up groove, which is an annular groove. The inner ring surface of the plug ring is fixed with a baffle, which is an annular plate structure. The baffle is used to limit the limit push ring and prevent the limit push ring from being completely withdrawn from the pick-up groove.

5. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The length of the inner spacer tube is smaller than that of the winding core tube; an annular receiving groove is formed between the outer ring surface of the inner spacer tube and the inner ring surface of the winding core tube for receiving the flexible protective cover; a limiting ring is fixed at one end of the inner spacer tube away from the plug ring; the limiting ring is a circular ring plate structure with an "L"-shaped cross section; after the flexible protective cover is folded and plugged into the annular receiving groove, the rubber ring is sleeved on the limiting ring.

6. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The inner annular surface of the inner spacer tube is provided with a second through-hole, and there are two second through-holes, which are symmetrically distributed about the tube mouth of the inner spacer tube. A clamping block is inserted into the inside of the second through-hole, and the plate length of the clamping block is greater than the distance from the outer annular surface of the inner spacer tube to the inner annular surface of the winding core tube. A third through-hole is provided at one end of the clamping block extending into the tube mouth of the inner spacer tube, and an elastic sheet is fixed on the surface of the third through-hole, and both ends of the elastic sheet are fixed on the inner annular surface of the inner spacer tube, and the two ends of the elastic sheet are respectively distributed on both sides of the second through-hole.

7. The impact-resistant lithium-ion battery separator assembly according to claim 6, characterized in that: A limiting groove is provided on the inner ring surface of the winding core tube, and the limiting groove is an annular groove. When the elastic sheet is in the initial state, one end of the clamping block extends into the limiting groove, and a part of the flexible protective cover is clamped in the limiting groove by the clamping block to prevent the flexible protective cover from being pulled when it is between the clamping block and the plug ring.

8. A method for installing an impact-resistant lithium-ion battery separator, using the impact-resistant lithium-ion battery separator assembly according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: Negative electrode shell placement: Place the negative electrode metal shell of the battery flat on the operating table; Insert components: Place metal shrapnel, metal gasket and metal lithium sheet into the negative electrode shell in sequence, making sure the center positions of these components coincide; Add electrolyte: Use a pipette or a rubber-tipped dropper to absorb an appropriate amount of electrolyte. Dissolve 1 mol / L LiPF6 in 1:1 ethylene carbonate and dimethyl carbonate, and add 5% fluoroethylene carbonate. Add it to the center of the lithium sheet to ensure that the electrolyte soaks the lithium sheet. Place the separator: Use insulated tweezers to pick up the cut lithium-ion battery separator and place it on the lithium sheet. The center of the lithium-ion battery separator should coincide with the lithium sheet. The main function of the lithium-ion battery separator is to prevent the positive and negative electrodes from directly contacting each other and causing a short circuit, and to allow the ions in the electrolyte to pass through. Add electrolyte again: Add an appropriate amount of electrolyte to the lithium-ion battery separator again to ensure that the lithium-ion battery separator is fully infiltrated; Placing the electrode sheet: Place the electrode sheet on the lithium-ion battery separator, ensuring that the center position of the electrode sheet coincides with the lithium-ion battery separator; Assemble the positive electrode shell: Cover the positive electrode shell on the electrode sheet, and put the steel sheet and spring assembly in turn to ensure that all components are tightly combined; Packaging battery: Place the entire button battery on the packaging machine for packaging. The packaging pressure should be adjusted according to the specific battery model and the requirements of the packaging machine to ensure the stability of the physical and chemical environment inside the battery. Let the battery sit: After packaging, take out the battery and let it sit for 10-12 hours to ensure that the electrolyte and the positive and negative electrode materials of the battery are completely infiltrated, so as to carry out subsequent electrochemical performance tests.

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