Impact-resistant lithium ion battery diaphragm assembly and mounting method thereof

Abstract

The invention relates to the technical field of electrical components, in particular to an impact-resistant lithium ion battery diaphragm assembly and an installation method thereof.The impact-resistant lithium ion battery diaphragm assembly comprises a lithium ion battery diaphragm and a storage assembly used for winding and storing the lithium ion battery diaphragm, the storage assembly comprises a winding core pipe used for winding the lithium ion battery diaphragm, and a plug ring is inserted into one end of the winding core pipe; a supporting block is inserted into the inner ring face of the plug ring, a limiting push ring is inserted into an inner ring opening of the plug ring, and the limiting push ring pushes the supporting block to abut against the inner wall of the winding core pipe and is used for limiting the plug ring in the winding core pipe. The impact-resistant lithium ion battery diaphragm assembly and the mounting method thereof have the beneficial effects that by designing the structures such as the plug ring, the supporting block and the limiting push ring, the flexible protective cover can be conveniently mounted and dismounted in the winding core tube. And a user can fix the flexible protective cover in the winding core tube or pull the flexible protective cover out for use only through simple pushing and pulling operation, so that the operation efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical components, in particular to an impact-resistant lithium-ion battery diaphragm assembly and a mounting method thereof. Background Art

[0002] In 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 short circuits caused by direct contact, while allowing ions in the electrolyte to pass through to achieve the battery's charging and discharging functions. In order to improve the performance and safety of lithium-ion batteries, the separator is usually subjected to a variety of coating treatments, such as impact-resistant coatings, heat-resistant coatings, etc. However, these high-performance coated separators are easily damaged during storage and transportation, such as scratches and tears, which in turn affects the overall performance of the battery.

[0003] To solve this problem, the industry usually sets up protective measures on the winding core tube that winds and stores lithium-ion battery separators. Traditional protective measures include wrapping the outside of the winding core tube with a hard protective shell 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 be disposed of after use, which is not conducive to environmental protection. Summary of the invention

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

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: 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, wherein the battery separator body comprises a base film and 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, one end of the winding core tube is plugged with a plug ring, the inner ring surface of the plug ring is plugged with a support block, and the inner ring mouth of the plug ring is plugged with a limiting push ring, the limiting 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, one end of the plug ring extending into the winding core tube is fixed with an inner spacer 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 the other end of the flexible protective cover is fixed with a rubber ring, the flexible protective cover is pulled out and turned over and then 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.

[0006] Preferably, the plug ring is an annular plate structure with an "L"-shaped cross section, the retaining ring is an annular plate, and the outer ring surface of the retaining ring is provided with a groove 1, which is an annular groove and is used to limit the rubber ring at the end of the flexible protective cover after it is unfolded.

[0007] Preferably, an embedding groove is provided on the outer ring surface of the plug ring, and the embedding groove is an annular groove. A through-opening is provided on the surface of the embedding groove. There are multiple through-openings, and the multiple through-openings are distributed in a circle with the plug ring as the central axis. The support block is movably inserted in the through-opening, and the plate length of the support block is greater than the depth of the through-opening. One end of the through-opening extending into the embedding groove is fixed on the inner ring surface of the elastic band. The elastic band has an annular structure, and the two ends of the elastic band are respectively fixed on two parallel side walls of the embedding groove.

[0008] Preferably, the other end of the support block is provided with a slope facing the retaining ring, and an avoidance groove is provided on the outer ring surface of the end 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 support block plate minus the length of the penetration depth.

[0009] Preferably, an introduction ring is fixed to the end of the limit push ring away from the retaining ring, and the introduction ring is a ring-shaped plate. After the limit 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 second groove, and the second groove is a circular ring groove with a spherical cross-section. A rubber ring is sleeved on one end of the introduction ring, and the rubber ring is a ring plate structure with a spherical cross-section. The rubber ring is clamped between the second groove and the introduction ring to produce elastic deformation.

[0010] Preferably, the inner ring surface of the limit push ring is provided with a pick-out groove in the form of an annular groove, and a baffle is fixed to the inner ring surface of the plug ring in the form of an annular plate structure, which is used to limit the limit push ring and prevent the limit push ring from being completely withdrawn from the pick-out groove.

[0011] Preferably, the length of the inner spacer tube is smaller than the length of the winding core tube, and 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, and 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.

[0012] Preferably, 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.

[0013] Preferably, 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, thereby preventing the flexible protective cover from being pulled when it is between the clamping block and the plug ring.

[0014] A method for installing an impact-resistant lithium-ion battery separator, using an impact-resistant lithium-ion battery separator assembly, the method comprising 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.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The impact-resistant lithium-ion battery diaphragm assembly and the installation method thereof proposed by the present invention realize the convenient installation and removal of the flexible protective cover inside the winding core tube by designing the plug ring, the support block, the limit push ring and other structures. The user only needs to simply push and pull the flexible protective cover to fix it inside the winding core tube or pull it out for use, which greatly improves the operating efficiency.

[0016] The flexible protective cover can be firmly mounted on the lithium-ion battery diaphragm through structures such as rubber rings and slots, effectively preventing the diaphragm 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.

[0017] Since the flexible protective cover can be hidden inside the winding core tube when not needed, no additional storage space is required. This is a significant advantage for the storage and transportation of lithium-ion batteries, especially in places where space is limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a side view of the structure of the present invention; Figure 3 for Figure 2 Structural cross-section view at AA in the middle; Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5 for Figure 3 A magnified schematic diagram of the structure at B in the middle; Figure 6 This is a schematic diagram of the connection structure between the plug ring and the inner spacer tube of the present invention; Figure 7 This is a schematic diagram of the limit push ring structure of the present invention; Figure 8 This is a schematic diagram of the clamping block structure of the present invention; Fig. 9 This is a schematic diagram of the structure of the flexible protective cover of the present invention after it is covered on the outside of the lithium-ion battery separator; Fig.10 for Fig. 9 Side view of the middle structure; Fig.11 for Fig.10 Structural cross-section view at the middle BB; Fig.12 for Fig.11 A magnified schematic diagram of the structure at C in the middle; Fig.13 This is a schematic diagram of the structure of the lithium-ion battery separator of the present invention; Fig.14 for Fig.13 Top view of the structure; Fig.15 for Fig.14 Structural cross-section view at CC; Fig.16 for Fig.15 Enlarged schematic diagram of the structure at point D in the middle.

[0019] 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, slot one 9, embedding slot 10, hole one 11, elastic band 12, support block 13, inclined surface 14, limit push ring 15, avoidance groove 16, pick-up groove 17, introduction ring 18, slot two 19, rubber sleeve 20, retaining piece 21, inner spacer 22, limit ring 23, hole two 24, clamping block 25, limit groove 26, hole three 27, elastic sheet 28, flexible protective cover 29, rubber ring 30. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail 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, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] For example, see Figures 13 to 16 The present invention provides a technical solution: an impact-resistant lithium-ion battery separator assembly, comprising a lithium-ion battery separator 5 and a storage assembly for winding and storing the lithium-ion battery separator 5, wherein the battery separator body comprises a base film 3 and a polymer coating coated on one side of the base film 3 and an inorganic particle coating 4 coated on the other side of the base film 3, wherein the polymer coating comprises an aramid coating 2 and a PBT coating 1, wherein the aramid coating 2 is disposed on one side of the base film 3, and the PBT coating 1 is disposed on a side of the aramid coating 2 away from the PBT coating 1.

[0022] 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 and drying the aramid coating liquid, 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 liquid, and the thickness of the PBT coating 1 is 0.1-2 μm. The aramid coating liquid 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 cosolvent, 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 of different particle sizes and a binder, and the thickness of the inorganic particle coating is 0.5-5 μm. The inorganic particle coating 4 is obtained by coating and drying the inorganic particle coating liquid.

[0023] Because the presence of the aramid coating 2 increases the roughness, the bonding 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. In addition, due to the presence of the PBT coating 1, the base film 3 has better impact resistance, which improves the safety of the battery. The inorganic particles of different particle sizes are arranged more closely to each other, and the bonding with the base film 3 is tighter, the inorganic particle coating 4 is not easy to fall off, and the bonding with the electrode sheet is tighter. The composite diaphragm has the good heat resistance and mechanical properties of the aramid coating 2, and the good electrochemical properties of the PBT coating 1. In addition, the inorganic particles of 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 is stored in the diaphragm, which is beneficial to improve the stability of the lithium ion battery diaphragm 5 during high rate charge and discharge and the rate performance of the battery. At the same time, because the inorganic particle coating has excellent heat resistance and a certain hardness, it can play a role in preventing the perforation and destruction of the diaphragm when lithium dendrites grow.

[0024] Embodiment 2, refer to the attached Figures 1 to 12 On the basis of the first embodiment, it is further proposed that the storage assembly includes a winding core tube 6 for winding the lithium-ion battery separator 5, a plug ring 7 is inserted at one end of the winding core tube 6, a support block 13 is inserted at the inner ring surface of the plug ring 7, and a limiting push ring 15 is inserted at the inner ring mouth of the plug ring 7, the limiting push ring 15 pushes the support block 13 against the inner wall of the winding core tube 6, and is used to limit the plug ring 7 in the winding core tube 6; the plug ring 7 is a circular ring plate structure with an "L"-shaped cross section, the retaining ring 8 is a circular ring plate, and a card groove 9 is provided on the outer ring surface of the retaining ring 8, and the card groove 9 is an annular groove for limiting the rubber ring 30 at the end of the flexible protective cover 29 after the expansion; 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, and the embedding groove 10 is A through opening 11 is provided on the surface, and there are multiple through openings 11. The multiple through openings 11 are distributed in a circle with the plug ring 7 as the central axis. A support block 13 is movably inserted in the through opening 11. The plate length of the support block 13 is greater than the depth of the through opening 11. One end of the through opening 11 extending into the embedded groove 10 is fixed on the inner ring surface of the elastic band 12. The elastic band 12 is an annular structure, and the two ends of the elastic band 12 are respectively fixed on two parallel side walls of the embedded groove 10; the other end of the support block 13 is provided with an inclined surface 14, and the inclined surface 14 faces the retaining ring 8. An avoidance groove 16 is provided on the outer ring surface of one end of the limiting push ring 15 away from the retaining ring 8. The avoidance groove 16 is an annular groove, and the depth of the avoidance groove 16 is equal to the plate length of the support block 13 minus the length of the depth of the through opening 11.

[0025] When in use, the structures inserted into the inner side of the winding core tube 6 are all detachable optional structures; when installing, 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 to be inserted into the winding core tube 6. In order to prevent the plug ring 7 from falling off the winding core tube 6, the limit push ring 15 is pushed to squeeze the support block 13. When the support block 13 moves, the tensioned elastic band 12 produces elastic deformation, and the support block 13 presses the elastic band 12 against the inner ring surface of the winding core tube 6, increasing 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 on the winding core Tube 6 to prevent the plug ring 7 from slipping 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 is inserted into the pick-up groove 17 to tension the limit push ring 15 to move toward the retaining ring 8 until the avoidance groove 16 and the through-opening 11 correspond. Since a step is formed between the avoidance groove 16 and the outer ring surface of the limit push ring 15, the elastic band 12 rebounds and pulls the support block 13 to move toward the avoidance groove 16. At this time, the support block 13 no longer rests on 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 why the baffle 21 is installed at the inner ring mouth of the plug ring 7 is to prevent the limit push ring 15 from being completely pulled out of the plug ring 7.

[0026] An introduction ring 18 is fixed to the end of the limiting push ring 15 away from the retaining ring 8. The introduction ring 18 is an annular plate. After the limiting push ring 15 pushes 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 groove 19. The second card groove 19 is a circular annular groove with a spherical fracture. One end of the introduction ring 18 is sleeved with a rubber ring 20. The rubber ring 20 is a ring plate structure with a spherical cross section. The rubber ring 20 is clamped between the second card groove 19 and the introduction ring 18 to produce elastic deformation; the inner ring surface of the limiting push ring 15 is provided with a pick-up groove 17, and the pick-up groove 17 is an annular groove. A baffle 21 is fixed to the inner ring surface of the plug ring 7. The baffle 21 is an annular plate structure. The baffle 21 is used to limit the limiting push ring 15 and prevent the limiting push ring 15 from being completely withdrawn from the pick-up groove 17.

[0027] When in use, the reason why the guide ring 18 is installed at the end of the limit push ring 15 is that when the limit push ring 15 pushes the support block 13 to limit the position, the guide ring 18 pushes the rubber ring 20 into the second groove 19, that is, the limit push ring 15 will not slide at will at this time, thereby ensuring that the limit push ring 15 stably limits the support block 13.

[0028] An inner spacer tube 22 is fixed to one end of the plug ring 7 extending into the winding core tube 6, and a flexible protective cover 29 is provided between the inner spacer tube 22 and the winding core tube 6, one end of the flexible protective cover 29 is fixed to one end of the plug ring 7, and an elastic ring 30 is fixed to the other end of the flexible protective cover 29. After the flexible protective cover 29 is pulled out and turned over, it is sleeved on the lithium-ion battery diaphragm 5. At this time, the elastic ring 30 is sleeved on the outer side of the retaining ring 8, and the retaining ring 8 is fixed to the other end of the plug ring 7; the tube length of the inner spacer tube 22 is less than the tube length of the winding core tube 6, and an annular receiving groove is formed between the outer ring surface of the inner spacer tube 22 and the inner ring surface of the winding core tube 6 for receiving the flexible protective cover 29, and a limiting ring 23 is fixed to the end of the inner spacer tube 22 away from the plug ring 7, and the limiting ring 23 is a circular ring plate structure with an "L"-shaped cross section. After the flexible protective cover 29 is folded and inserted into the annular receiving groove, the elastic ring 30 is sleeved on the limiting ring 23; the inner ring surface of the inner spacer tube 22 is provided with a through hole The second through-opening 24 is provided with two through-openings 24, and the two through-openings 24 are symmetrically distributed about the tube opening of the inner spacer tube 22. A clamping block 25 is inserted into the inside of the through-opening 24, and the plate length of the clamping block 25 is greater than the distance from the outer annular surface of the inner spacer tube 22 to the inner annular surface of the winding core tube 6. A through-opening 3 27 is provided at one end of the clamping block 25 extending to the inside of the tube opening of the inner spacer tube 22, and an elastic sheet 28 is fixed on the surface of the through-opening 3 27, and both ends of the elastic sheet 28 are fixed to the inner spacer tube 2 2, and the two ends of the elastic sheet 28 are respectively distributed on both sides of the through-opening 24; a limiting groove 26 is provided on the inner ring surface of the winding core tube 6, and the limiting 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 limiting groove 26, and a part of the flexible protective cover 29 is clamped in the limiting groove 26 by the clamping block 25, so as to prevent the flexible protective cover 29 from being pulled when it is between the clamping block 25 and the plug ring 7.

[0029] When in use, the flexible protective cover 29 is installed so that after the lithium-ion battery diaphragm 5 is wound on the winding core tube 6, the flexible protective cover 29 is pulled out from between the inner separator tube 22 and the winding core tube 6, and then the pulled out flexible protective cover 29 is folded and sleeved on the lithium-ion battery diaphragm 5. The distance that the flexible protective cover 29 is pulled out is sufficient for the flexible protective cover 29 to be folded and sleeved on the lithium-ion battery diaphragm 5, and the rubber ring 30 can be sleeved in the card slot 9. At this time, the flexible protective cover 29 wraps and protects the lithium-ion battery diaphragm 5 to prevent the lithium-ion battery diaphragm 5 from being scratched after being exposed, 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. It should be noted that when the flexible protective cover 29 is pulled outward from between the inner spacer tube 22 and the winding core tube 6, two fingers are respectively inserted into the through-holes 27 on the surfaces of the two clamping blocks 25, and the two fingers are closed to pull the clamping block 25 to move along the corresponding through-holes 24 into the inner spacer tube 22, and one end of the clamping block 25 is pulled out from the limiting groove 26, and the clamping block 25 pulls the elastic sheet 28 to produce elastic deformation. After the clamping block 25 is pulled out from the limiting groove 26, the flexible protective cover 29 is no longer The flexible protective cover 29 can be pulled out by being clamped and limited. When the length of the flexible protective cover 29 pulled out meets the requirement, the clamp block 25 is released, the elastic sheet 28 rebounds and pulls the clamp block 25 back, and one end of the clamp block 25 extends into the limiting groove 26. At this time, part of the flexible protective cover 29 is clamped in the limiting groove 26 by the clamp block 25 to prevent the flexible protective cover 29 from being pulled out further, that is, to prevent the flexible protective cover 29 between the clamp block 25 and the plug ring 7 from being pulled out.

[0030] Embodiment 3, based on embodiment 2, proposes a method for installing an impact-resistant lithium-ion battery diaphragm, using an impact-resistant lithium-ion battery diaphragm assembly, and 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. Placing the separator: Use insulating tweezers to pick up the cut lithium-ion battery separator 5 and place it on the lithium sheet. The center 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 the positive and negative electrodes from directly contacting each other and causing a short circuit, and to allow ions in the electrolyte to pass through. Adding electrolyte again: Add an appropriate amount of electrolyte again on the lithium-ion battery separator 5 to ensure that the lithium-ion battery separator 5 is fully infiltrated; Placing the electrode sheet: placing the electrode sheet on the lithium-ion battery separator 5, ensuring that the center position of the electrode sheet coincides with the lithium-ion battery separator 5; 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.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 (5) and a storage assembly for winding and storing the lithium-ion battery separator (5), characterized in that: The battery separator body comprises a base film (3), a polymer coating coated on one side of the base film (3), and an inorganic particle coating (4) coated on the other side of the base film (3), wherein the polymer coating comprises an aramid coating (2) and a PBT coating (1), wherein the aramid coating (2) is disposed on one side of the base film (3), and the PBT coating (1) is disposed on a side of the aramid coating (2) away from the PBT coating (1); The storage assembly comprises a winding core tube (6) for winding a lithium-ion battery separator (5), one end of the winding core tube (6) is plugged with a plug ring (7), the inner ring surface of the plug ring (7) is plugged with a support block (13), and the inner ring opening of the plug ring (7) is plugged with a limiting push ring (15), the limiting push ring (15) pushes the support block (13) against the inner wall of the winding core tube (6), and is used to limit the plug ring (7) in the winding core tube (6), and the plug ring (7) extends into one end of the winding core tube (6). An inner spacer tube (22) is fixed thereto, a flexible protective cover (29) is provided between the inner spacer tube (22) and the winding core tube (6), one end of the flexible protective cover (29) is fixed to one end of the plug ring (7), a rubber ring (30) is fixed to the other end of the flexible protective cover (29), the flexible protective cover (29) is pulled out and turned over and sleeved on the lithium-ion battery diaphragm (5), at which time the rubber ring (30) is sleeved on the outside of the retaining ring (8), and the retaining ring (8) is fixed to the other end of the plug ring (7).

2. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The plug ring (7) is in the form of an L-shaped circular plate structure in cross section, the retaining ring (8) is in the form of a circular plate, and a retaining groove (9) is provided on the outer ring surface of the retaining ring (8). The retaining groove (9) is in the form of an annular groove and is used to limit the position of the rubber ring (30) at the end of the flexible protective cover (29) after it is deployed.

3. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The outer ring surface of the plug ring (7) is provided with an embedding groove (10), the embedding groove (10) is an annular groove, the surface of the embedding groove (10) is provided with a through opening (11), there are a plurality of through openings (11), the plurality of through openings (11) are distributed in a circle with the plug ring (7) as the central axis, a support block (13) is movably inserted in the through opening (11), the plate length of the support block (13) is greater than the depth of the through opening (11), one end of the through opening (11) extending into the embedding groove (10) is fixed on the inner ring surface of the elastic band (12), the elastic band (12) is annular in structure, and the two ends of the elastic band (12) are respectively fixed on two parallel side walls of the embedding groove (10).

4. The impact-resistant lithium-ion battery separator assembly according to claim 3, characterized in that: The other end of the support block (13) is provided with an inclined surface (14), the inclined surface (14) faces the retaining ring (8), and an avoidance groove (16) is provided on the outer ring surface of one end of the limit push ring (15) away from the retaining ring (8). The avoidance groove (16) is an annular groove, and the depth of the avoidance groove (16) is equal to the length of the support block (13) plate minus the length of the depth of the hole (11).

5. The impact-resistant lithium-ion battery separator assembly according to claim 2, characterized in that: An introduction ring (18) is fixed to one end of the limit push ring (15) away from the retaining ring (8), and the introduction ring (18) is an annular plate. After the limit push ring (15) pushes the support block (13) against the inner annular surface of the winding core tube (6), one end of the introduction ring (18) is inserted into the second clamping groove (19), and the second clamping groove (19) is a circular annular groove with a spherical fracture. A rubber sleeve (20) is sleeved on one end of the introduction ring (18), and the rubber sleeve (20) is an annular plate structure with a spherical cross section. The rubber sleeve (20) is clamped between the second clamping groove (19) and the introduction ring (18) to generate elastic deformation.

6. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The inner ring surface of the limit push ring (15) is provided with a pick-out groove (17) in the form of an annular groove. A baffle (21) is fixed to the inner ring surface of the plug ring (7) in the form of an annular plate structure. The baffle (21) is used to limit the position of the limit push ring (15) and prevent the limit push ring (15) from being completely withdrawn from the pick-out groove (17).

7. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The length of the inner spacer tube (22) is less than the length of the winding core tube (6); an annular receiving groove is formed between the outer annular surface of the inner spacer tube (22) and the inner annular surface of the winding core tube (6) for receiving the flexible protective cover (29); a limiting ring (23) is fixed to the end of the inner spacer tube (22) away from the plug ring (7); the limiting ring (23) is a circular ring plate structure with an "L"-shaped cross section; after the flexible protective cover (29) is folded and inserted into the annular receiving groove, the rubber ring (30) is sleeved on the limiting ring (23).

8. The impact-resistant lithium-ion battery separator assembly according to claim 1, characterized in that: The inner annular surface of the inner spacer tube (22) is provided with a second through-opening (24), and the second through-opening (24) is provided with two. The two second through-openings (24) are symmetrically distributed about the tube mouth of the inner spacer tube (22). A clamping block (25) is inserted into the inside of the second through-opening (24), and the plate length of the clamping block (25) is greater than the distance from the outer annular surface of the inner spacer tube (22) to the inner annular surface of the winding core tube (6). A third through-opening (27) is provided at one end of the clamping block (25) extending into the tube mouth of the inner spacer tube (22), and an elastic sheet (28) is fixed on the surface of the third through-opening (27), and both ends of the elastic sheet (28) are fixed to the inner annular surface of the inner spacer tube (22), and the two ends of the elastic sheet (28) are respectively distributed on both sides of the second through-opening (24).

9. The impact-resistant lithium-ion battery separator assembly according to claim 8, characterized in that: The inner annular surface of the winding core tube (6) is provided with a limiting groove (26), which is an annular groove. When the elastic sheet (28) is in an initial state, one end of the clamping block (25) extends into the limiting groove (26), and a part of the flexible protective cover (29) is clamped in the limiting groove (26) by the clamping block (25), thereby preventing the flexible protective cover (29) from being pulled when it is located between the clamping block (25) and the plug ring (7).

10. 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 9, 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. Placing the separator: using insulating tweezers to pick up the cut lithium-ion battery separator (5), and placing it on the lithium sheet. The center of the lithium-ion battery separator (5) should overlap with the lithium sheet. The main function of the lithium-ion battery separator (5) is to prevent the positive and negative electrodes from directly contacting each other and causing a short circuit, and to allow ions in the electrolyte to pass through. Adding electrolyte again: Adding an appropriate amount of electrolyte again on the lithium-ion battery separator (5) to ensure that the lithium-ion battery separator (5) is fully soaked; Placing the electrode sheet: placing the electrode sheet on the lithium-ion battery separator (5), ensuring that the center position of the electrode sheet coincides with the lithium-ion battery separator (5); 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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