A high-strength lithium battery separator

Abstract

The utility model discloses a high-strength lithium battery diaphragm, comprising a diaphragm and a shell, wherein a pleated section is provided on the diaphragm, strength-upgraded patches are symmetrically installed on both sides of the pleated section, two ends of the strength-upgraded patch are respectively fixedly bonded to the diaphragm, a plurality of groups of equally-spaced connecting sheets are provided between the strength-upgraded patch and the pleated section, three groups of equally-spaced telescopic connecting membranes are provided between the connecting sheets, the longitudinal tensile strength of the diaphragm is enhanced by arranging the pleated section and the strength-upgraded patch on the diaphragm, the expansion strength of the diaphragm is enhanced by arranging the connecting sheet and the telescopic connecting membrane on the strength-upgraded patch and the pleated section, and the telescopic connecting membrane and the pleated section are both diaphragms made of the same material, but are made to have certain corrugations in physical form, and the diaphragm has a certain buffer strength when it expands along the thickness direction or has a certain stress inside during use, so that the diaphragm is not easy to rupture.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a high-strength lithium battery separator. Background Art

[0002] Among all secondary batteries, lithium-ion batteries have the characteristics of high specific energy, high specific power, long cycle life and excellent high and low temperature performance, and have been widely used in various fields. The lithium battery separator is one of the key inner components in the lithium battery structure. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through.

[0003] In the prior art, when a lithium-ion battery is in long-term charge and discharge use, the diaphragm will expand in the thickness direction, causing a certain internal stress in the diaphragm. The heat generated inside the battery forms burrs on the pole piece, which will puncture the diaphragm. The rupture of the diaphragm causes the positive and negative poles inside the battery to be directly connected, which in turn causes a large-area short circuit in the battery, causing danger to the use of the battery. Utility Model Content

[0004] The purpose of the utility model is to provide a high-strength lithium battery separator to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-strength lithium battery diaphragm, comprising a diaphragm and an outer shell, the diaphragm is provided with a pleated section, strength-upgraded patches are symmetrically installed on both sides of the pleated section, the two ends of the strength-upgraded patch are respectively fixedly bonded to the diaphragm, a plurality of groups of equidistantly distributed connecting sheets are provided between the strength-upgraded patches and the pleated sections, three groups of equidistantly distributed telescopic connecting membranes are provided between the connecting sheets, and a first winding rod and a second winding rod are provided in the outer shell.

[0006] As a further preferred embodiment of the present technical solution, the connecting pieces are respectively fixedly connected to the corresponding strength upgrading patches or pleated segments, and both ends of the telescopic connecting membrane are respectively fixedly connected to the corresponding connecting pieces.

[0007] As a further preferred embodiment of the present technical solution, both ends of the first reel and the second reel are rotatably connected to the outer shell, both ends of the diaphragm are respectively wound around the first reel and the second reel, both ends of the first reel and the second reel are sleeved with disc springs, and the inner and outer ends of the disc spring are respectively fixedly connected to the corresponding first reel or the second reel and the outer shell.

[0008] As a further preferred embodiment of the technical solution, the upper ends of the first rolling rod and the second rolling rod are both sleeved with a first gear, the outer shell is provided with a second gear, the second gear is rotatably connected to the outer shell through a handle, a ratchet is sleeved on the handle, a pawl is provided in the outer shell, and the pawl is rotatably connected to the outer shell through a mounting rod.

[0009] As a further preferred embodiment of the present technical solution, two groups of the first gears are distributed on both sides of the second gear, and the second gear is respectively meshed and connected with the two groups of the first gears.

[0010] As a further preferred embodiment of the present technical solution, the pawl is meshedly connected with the ratchet wheel, a torsion spring is sleeved on the mounting rod, and two ends of the torsion spring are respectively fixedly connected to the mounting rod and the housing.

[0011] The utility model provides a high-strength lithium battery separator, which has the following beneficial effects:

[0012] (1) The utility model enhances the longitudinal tensile strength of the diaphragm by arranging a pleated section and a strength-upgraded patch on the diaphragm, and enhances the expansion strength of the diaphragm by arranging a connecting piece and a telescopic connecting film on the strength-upgraded patch and the pleated section. The telescopic connecting film and the pleated section are both made of the same material as the diaphragm, but have certain corrugations in physical form. When the diaphragm expands along the thickness direction or has certain stress inside during use, it has a certain buffer strength, so that the diaphragm is not easy to rupture and thus cause the positive and negative poles of the battery to be directly connected.

[0013] (2) The utility model rolls up part of the diaphragm by setting a first rolling rod and a second rolling rod, so that a section of the diaphragm can be replaced during the use of the battery, thereby extending the overall service life of the diaphragm and the service life of the battery; when the diaphragm expands during use, the pleated section is first stretched to a certain extent. After the pleated section is stretched to a certain extent, the handle is turned to drive the second gear to rotate, and the second gear drives the two groups of first gears to rotate respectively, thereby causing the first rolling rod and the second rolling rod to rotate, respectively rolling up and relaxing the two ends of the diaphragm, thereby realizing the replacement of the used section of the diaphragm. The newly replaced diaphragm has better ductility and strength, and can better avoid rupture. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the pleated section of the utility model;

[0016] Figure 3 For the utility model Figure 2 -A magnified view of the structure;

[0017] Figure 4 It is a schematic diagram of the structure of the housing of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the first rolling rod of the utility model;

[0019] Figure 6 It is a structural schematic diagram of the first gear of the utility model;

[0020] In the figure: 1. diaphragm; 2. pleated section; 3. strength upgrade patch; 4. connecting piece; 5. telescopic connecting membrane; 6. outer shell; 7. first winding rod; 8. second winding rod; 9. coil spring; 10. first gear; 11. handle; 12. second gear; 13. ratchet; 14. pawl; 15. mounting rod; 16. torsion spring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] The utility model provides a technical solution: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, a high-strength lithium battery diaphragm includes a diaphragm 1 and a shell 6, a pleated section 2 is provided on the diaphragm 1, and strength upgrading patches 3 are symmetrically installed on both sides of the pleated section 2, and the two ends of the strength upgrading patch are respectively fixedly bonded to the diaphragm 1, and multiple groups of equidistantly distributed connecting sheets 4 are provided between the strength upgrading patch 3 and the pleated section 2, and three groups of equidistantly distributed telescopic connecting membranes 5 are provided between the connecting sheets 4. A first winding rod 7 and a second winding rod 8 are provided in the shell 6, and the connecting sheets 4 are respectively fixedly connected to the corresponding strength upgrading patches 3 or the pleated sections 2, and the two ends of the telescopic connecting membrane 5 are respectively fixedly connected to the corresponding connecting sheets 4, and the two ends of the first winding rod 7 and the second winding rod 8 are rotatably connected to the shell 6, and the two ends of the diaphragm 1 are respectively wound around the first winding rod 7 and the second winding rod 8, and the two ends of the first winding rod 7 and the second winding rod 8 are both sleeved with coil springs 9, and the inner and outer ends of the coil spring 9 are respectively fixedly connected to the corresponding first winding rod 7 or the second winding rod 8 and the shell 6.

[0023] The longitudinal tensile strength of the diaphragm 1 is enhanced by arranging a pleated section 2 and a strength upgrading patch 3 on the diaphragm 1, and the expansion strength of the diaphragm 1 is improved by arranging a connecting piece 4 and a telescopic connecting membrane 5 on the strength upgrading patch 3 and the pleated section 2. The telescopic connecting membrane 5 and the pleated section 2 both use the diaphragm 1 of the same material, but have certain corrugations in physical form. When the diaphragm 1 expands along the thickness direction or has certain stress inside during use, it has a certain buffer strength, so that the diaphragm 1 is not easy to rupture and thus cause the positive and negative poles of the battery to be directly connected.

[0024] like Figure 5 and Figure 6 As shown, the upper ends of the first rolling rod 7 and the second rolling rod 8 are both sleeved with a first gear 10, a second gear 12 is provided in the outer shell 6, the second gear 12 is rotatably connected to the outer shell 6 through a handle 11, a ratchet 13 is sleeved on the handle 11, a pawl 14 is provided in the outer shell 6, the pawl 14 is rotatably connected to the outer shell 6 through a mounting rod 15, two groups of first gears 10 are distributed on both sides of the second gear 12, the second gear 12 is respectively meshed with the two groups of first gears 10, the pawl 14 is meshed with the ratchet 13, a torsion spring 16 is sleeved on the mounting rod 15, and both ends of the torsion spring 16 are respectively fixedly connected to the mounting rod 15 and the outer shell 6.

[0025] By setting the first winding rod 7 and the second winding rod 8, part of the diaphragm 1 is rolled up, and then a section of the diaphragm 1 can be replaced during the use of the battery, thereby extending the overall service life of the diaphragm 1 and the service life of the battery; when the diaphragm 1 expands during use, the pleated section 2 is first stretched to a certain extent. After the pleated section 2 is stretched to a certain extent, the handle 11 is turned to drive the second gear 12 to rotate, and the second gear 12 drives the two groups of first gears 10 to rotate respectively, thereby causing the first winding rod 7 and the second winding rod 8 to rotate, respectively rolling up and relaxing the two ends of the diaphragm 1, thereby realizing the replacement of the used section of the diaphragm 1. The newly replaced diaphragm 1 has better ductility and strength, and can better avoid rupture.

[0026] The utility model provides a high-strength lithium battery diaphragm, and the specific working principle is as follows: the longitudinal tensile strength of the diaphragm 1 is enhanced by arranging a pleated section 2 and a strength upgrading patch 3 on the diaphragm 1, and the expansion strength of the diaphragm 1 is improved by arranging a connecting piece 4 and a telescopic connecting film 5 on the strength upgrading patch 3 and the pleated section 2, and the telescopic connecting film 5 and the pleated section 2 are both made of the same material as the diaphragm 1, but are made to have certain corrugations in physical form, and the diaphragm 1 has a certain buffer strength when it expands along the thickness direction or has a certain stress inside during use, so that the diaphragm 1 is not easy to break and thus leads to the direct connection of the positive and negative electrodes of the battery, and when the diaphragm 1 expands during use, the pleated section 2 is first stretched to a certain extent, and after the pleated section 2 is stretched to a certain extent, the handle 11 is turned to drive the second gear 12 to rotate, and the second gear 12 drives the two groups of first gears 10 to rotate respectively, thereby causing the first winding rod 7 and the second winding rod 8 to rotate, and the two ends of the diaphragm 1 are respectively rolled up and relaxed, so as to realize the replacement of the used section diaphragm 1, and the newly replaced diaphragm 1 has better ductility and strength, and can better avoid rupture.

[0027] 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. A high-strength lithium battery separator, comprising a separator (1) and a housing (6), characterized in that: The diaphragm (1) is provided with a pleated section (2), and strength-upgraded patches (3) are symmetrically mounted on both sides of the pleated section (2). The two ends of the strength-upgraded patches are respectively fixedly bonded to the diaphragm (1), and a plurality of groups of equally spaced connecting sheets (4) are provided between the strength-upgraded patches (3) and the pleated section (2). Three groups of equally spaced telescopic connecting membranes (5) are provided between the connecting sheets (4), and a first rolling rod (7) and a second rolling rod (8) are provided in the housing (6).

2. A high-strength lithium battery separator according to claim 1, characterized in that: The connecting pieces (4) are respectively fixedly connected to the corresponding strength upgrading patches (3) or pleated sections (2), and the two ends of the telescopic connecting membrane (5) are respectively fixedly connected to the corresponding connecting pieces (4).

3. A high-strength lithium battery separator according to claim 1, characterized in that: Both ends of the first reel (7) and the second reel (8) are rotatably connected to the outer shell (6); both ends of the diaphragm (1) are respectively wound around the first reel (7) and the second reel (8); both ends of the first reel (7) and the second reel (8) are sleeved with a coil spring (9); the inner and outer ends of the coil spring (9) are respectively fixedly connected to the corresponding first reel (7) or second reel (8) and the outer shell (6).

4. A high-strength lithium battery separator according to claim 1, characterized in that: The upper ends of the first rolling rod (7) and the second rolling rod (8) are both sleeved with a first gear (10); a second gear (12) is provided in the housing (6); the second gear (12) is rotatably connected to the housing (6) via a handle (11); a ratchet (13) is sleeved on the handle (11); a ratchet pawl (14) is provided in the housing (6); the ratchet pawl (14) is rotatably connected to the housing (6) via a mounting rod (15).

5. A high-strength lithium battery separator according to claim 4, characterized in that: The two groups of the first gears (10) are distributed on both sides of the second gear (12), and the second gear (12) is meshedly connected with the two groups of the first gears (10) respectively.

6. A high-strength lithium battery separator according to claim 4, characterized in that: The pawl (14) is meshedly connected to the ratchet wheel (13); a torsion spring (16) is sleeved on the mounting rod (15); and two ends of the torsion spring (16) are respectively fixedly connected to the mounting rod (15) and the housing (6).

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