CN210692654U

CN210692654U - Lithium ion battery composite diaphragm

Info

Publication number: CN210692654U
Application number: CN201921925847.5U
Authority: CN
Inventors: 李军
Original assignee: Shishi Shentai New Material Technology Co Ltd
Current assignee: Shishi Shentai New Material Technology Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-06-05
Anticipated expiration: 2029-11-08

Abstract

The utility model relates to a battery diaphragm, in particular to a lithium ion battery composite diaphragm, which mainly solves the problem of high manufacturing cost of the composite diaphragm in the prior art, and comprises a frame body and a composite diaphragm body, wherein the frame body comprises a base and a fixed part, a clamping strip is arranged on one side surface surrounding the base, the free end of the clamping strip is provided with a clamping part, the cross section of the clamping part is of a spherical structure, the base is provided with a plurality of first through holes, the first through holes are provided with spherical grooves, the opening diameter of the spherical grooves is larger than that of the first through holes, the fixed part is provided with buckles, the fixed part is provided with second through holes, threaded rods are penetrated through the first through holes and the second through holes, one end of the threaded rod close to the spherical grooves is provided with a top block, the threaded rod is sleeved with a connecting ring, the periphery of the connecting ring is, the free end of the arc-shaped part is abutted against the inner surface of the spherical groove, and a nut is connected to one end of the threaded rod, which is close to the second through hole, through threads.

Description

Lithium ion battery composite diaphragm

Technical Field

The utility model relates to a battery diaphragm especially relates to a compound diaphragm of lithium ion battery.

Background

At present, lithium ion batteries are widely applied in daily life, and a diaphragm is one of important components of the lithium ion batteries because the diaphragm is positioned between a positive electrode and a negative electrode and mainly has the main function of separating positive and negative active substances, preventing the two electrodes from being disconnected due to contact and enabling electrolyte ions to smoothly pass through, so that the lithium ion battery diaphragm has a vital influence on the performance of the battery. Therefore, the battery is short-circuited, and the installation and fixation of the diaphragm are important, so that the stability must be ensured, and the normal operation of the lithium ion battery is influenced.

Chinese patent application No.: 201721060990.3 discloses a lithium battery composite diaphragm, which comprises a diaphragm fixing piece, wherein the front end of the inner cavity of the diaphragm fixing piece is provided with a socket, the upper end of the left side of the socket is provided with a slot, the inside of the slot is inserted with a composite diaphragm, the composite diaphragm penetrates through the socket to the slot, the center of the bottom of the inner cavity of the diaphragm fixing piece is provided with a square pressing groove, the square pressing groove is communicated with the slot, and a pressing device is fixedly arranged inside the square pressing groove; the composite diaphragm comprises an inorganic ceramic porous membrane, a first filtering interface is fixedly arranged on the upper surface of the inorganic ceramic porous membrane, a second filtering interface is fixedly arranged on the lower surface of the inorganic ceramic porous membrane, a first gelled microporous polymer membrane is fixedly arranged on the upper surface of the first filtering interface, a second gelled microporous polymer membrane is fixedly arranged on the lower surface of the second filtering interface, a first reinforcing layer is arranged on the upper surface of the first gelled microporous polymer membrane, and a second reinforcing layer is arranged on the lower surface of the second gelled microporous polymer membrane; the pressing device comprises a servo motor, a cavity is fixedly mounted at the top end of the servo motor, a lead screw is fixedly mounted at the output end of the servo motor and penetrates through the cavity, a lead screw nut is screwed on the outer side of the lead screw, the outer side wall of the lead screw nut is fixedly mounted on the inner side wall of the cavity, a square pressing block is fixedly mounted at the top end of the lead screw, the servo motor is electrically connected with an external signal controller, and the external signal controller is electrically connected with a position sensor. The utility model can further increase the mechanical strength of the composite diaphragm by adding the first reinforcing layer and the second reinforcing layer, and the reinforcing ribs and the reinforcing plates are arranged in the reinforcing layers, so that the composite diaphragm of the lithium battery is more pressure-resistant and bending-resistant; however, through the relationship between the pressing device of the pressing cavity and the position sensor, the external signal controller switch controls the servo motor to work, then the servo motor controls the screw rod to do linear motion, and further drives the square pressing block to move upwards to fix the composite diaphragm, and the manufacturing cost is high.

SUMMERY OF THE UTILITY MODEL

Therefore, to foretell problem, the utility model provides a compound diaphragm of lithium ion battery, it has mainly solved the problem that manufacturing cost is high of compound diaphragm among the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a lithium ion battery composite diaphragm comprises a frame body and a composite diaphragm body arranged on the frame body, wherein the frame body comprises a base and a fixing part, the base is formed by sequentially connecting four frame strips end to form an integral body, the fixing part is respectively buckled with the frame strips on the base and is used for fixing the composite diaphragm body, the middle part of the base is provided with a through groove for placing the composite diaphragm body, a clamping strip is arranged on one side surface of the base, which is close to the through groove, the free end of the clamping strip is provided with a clamping part, the cross section of the clamping part is of a spherical structure, a plurality of first through holes are arranged on the base at intervals along the length direction of the frame strips, a spherical groove is arranged at the position of the first through holes, which is positioned on the base and is opposite to the clamping strip, the diameter of the opening of the spherical groove is larger than that of the first through, the fixing part is provided with a first through hole, the first through hole is communicated with the second through hole through a threaded rod, a top block is arranged at one end, close to the spherical groove, of the threaded rod, a connecting ring is sleeved on the threaded rod, at least three arc-shaped parts are arranged on the periphery of the connecting ring in an extending mode along the axial direction of the threaded rod, the free ends of the arc-shaped parts are abutted to the inner surface of the spherical groove, and a nut is connected to one end, close to the second through hole, of the threaded rod.

Furthermore, the horizontal both sides of joint portion go up to extend along the length direction of frame strip and are provided with two sand grips.

Furthermore, a sealing groove is formed in the spherical groove close to the first through hole, and a sealing ring is arranged in the sealing groove.

Furthermore, a positioning rod is arranged on the base, and a positioning hole is arranged on the fixing part and corresponds to the positioning rod.

By adopting the technical scheme, the beneficial effects of the utility model are that: the lithium ion battery composite diaphragm is simple in structure and easy and convenient to operate, and greatly reduces the manufacturing and using costs; furthermore, the raised lines arranged on the clamping parts enable the clamping parts and the buckles to be connected firmly, so that the composite diaphragm body is well fixed; further, the sealing washer that sets up in the spherical groove supports through the fixed of arc portion and leans on for the leakproofness of base and fixed part is good.

Drawings

Fig. 1 is a schematic top view of an embodiment of the present invention;

fig. 2 is a schematic top view of the base in the embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken at A-A in FIG. 1;

fig. 4 is a partially enlarged view at B in fig. 3.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings and detailed description.

The embodiment of the utility model provides a do:

referring to fig. 1 to 4, a lithium ion battery composite separator comprises a frame 1 and a composite separator body 2 arranged on the frame 1, wherein the frame 1 comprises a base 3 formed by four frame strips connected end to end in sequence and a fixing part 4 respectively buckled with the frame strips on the base 3 for fixing the composite separator body 2, the middle part of the base 3 is provided with a through groove 5 for placing the composite separator body 2, a clamping strip 6 is arranged on one side surface of the base 3 near the through groove 5, the free end of the clamping strip 6 is provided with a clamping part 7, the cross section of the clamping part 7 is of a spherical structure, two convex strips 8 are arranged on two transverse sides of the clamping part 7 in an extending manner along the length direction of the frame strips, first through holes 9 are arranged on the base 3 at intervals along the length direction of the frame strips, the first through holes 9 are arranged on the base 3 and are provided with spherical grooves 10 on the surface opposite to the clamping strip 6, the diameter of the opening of the spherical groove 10 is greater than the diameter of the first through hole 9, a sealing groove 11 is arranged in the spherical groove 10 close to the first through hole 9, a sealing ring 12 is arranged in the sealing groove 11, a buckle 13 for buckling the clamping portion 7 is arranged at a position corresponding to the clamping strip 6 on the fixing portion 4, a second through hole 14 is arranged at a position corresponding to the first through hole 9 on the fixing portion 4, a threaded rod 15 is penetrated through the first through hole 9 and the second through hole 14, a top block 16 is arranged at one end of the threaded rod 15 close to the spherical groove 10, a connecting ring 17 is sleeved on the threaded rod 15, four arc-shaped portions 18 are arranged on the periphery of the connecting ring 17 along the axial direction of the threaded rod 15 in an extending manner, the free ends of the arc-shaped portions 18 are abutted against the sealing ring 12, and a nut 19 is connected to one end of the threaded rod, the base 3 is provided with a positioning rod 20, and the fixing portion 4 is provided with a positioning hole (not shown) corresponding to the positioning rod 20.

The utility model discloses a working method is: the lithium ion battery composite diaphragm is characterized in that a composite diaphragm body 2 is placed at a through groove 5 of a base 3, the periphery of the composite diaphragm body 2 is abutted against a clamping part 7, a fixing part 4 is matched with a frame strip on the base 3, a buckle 13 on the fixing part 4 is buckled into the clamping part 7, so that the composite diaphragm body 2 is clamped and fixed between the buckle 13 and the clamping part 7, meanwhile, a threaded rod 15 sequentially penetrates through a first through hole 9 and a second through hole 14 from a spherical groove 10, the threaded rod 15 moves upwards through a rotary nut 19, a connecting ring 17 and an arc part 18 which are sleeved on the threaded rod 15 are jacked into the spherical groove 10 under the action of a jacking block 16 of the threaded rod 15, the arc part 18 is deformed, the base 3 is firmly connected with the fixing part 4, and the composite diaphragm body 2 is well fixed, the structure is simple, the operation is simple and convenient, and the manufacturing and using cost is greatly reduced; the convex strips 9 arranged on the clamping part 7 ensure that the firmness of the connection between the clamping part 7 and the buckle 13 is good, so that the composite diaphragm body 2 is well fixed; the sealing ring 11 arranged in the spherical groove 10 is abutted by the arc part 18, so that the base 3 and the fixing part 4 have good sealing performance.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A lithium ion battery composite diaphragm is characterized in that: the composite diaphragm body comprises a frame body and a composite diaphragm body arranged on the frame body, wherein the frame body comprises a base and a fixing part, the base is formed by sequentially connecting four frame strips end to end into a whole, the fixing part is respectively buckled with the frame strips on the base to fix the composite diaphragm body, a through groove for placing the composite diaphragm body is arranged in the middle of the base, a clamping strip is arranged on one side surface surrounding the base and close to the through groove, the free end of the clamping strip is provided with a clamping part, the cross section of the clamping part is of a spherical structure, a plurality of first through holes are arranged on the base at intervals along the length direction of the frame strips, a spherical groove is arranged at the position, opposite to the clamping strip, of the first through holes on the base, the opening diameter of the spherical groove is larger than that of the first through holes, buckles for buckling the clamping part are arranged at the positions, corresponding to the clamping strips, of the fixing part, threaded rods penetrate through the first through holes and the second through holes, a top block is arranged at one end, close to the spherical groove, of each threaded rod, a connecting ring is sleeved on each threaded rod, at least three arc-shaped portions are arranged on the peripheries of the connecting rings in an extending mode along the axial direction of the threaded rods, the free ends of the arc-shaped portions abut against the inner surface of the spherical groove, and a nut is connected to one end, close to the second through hole, of each threaded rod in a threaded mode.

2. The lithium ion battery composite separator according to claim 1, wherein: two convex strips are arranged on the two transverse sides of the clamping portion in an extending mode along the length direction of the frame strips.

3. The lithium ion battery composite separator according to claim 2, wherein: a sealing groove is formed in the spherical groove close to the first through hole, and a sealing ring is arranged in the sealing groove.

4. The lithium ion battery composite separator according to claim 3, wherein: the base is provided with a positioning rod, and the fixing part is provided with a positioning hole corresponding to the positioning rod.