阅读说明：本技术 一种湿法锂电池隔膜横拉收缩定型装置 (Wet process lithium battery diaphragm violently draws shrink setting device ) 是由 周阳 刘杲珺 白耀宗 董浩宇 翟萌萌 韩超 孟祥凎 邱广凯 魏明 于 2020-12-22 设计创作，主要内容包括：本发明提供一种湿法锂电池隔膜横拉收缩定型装置。该湿法锂电池隔膜横拉收缩定型装置,包括入口链轮,膜夹闭夹器,膜夹开夹器,出口链轮,链条,夹子,收缩调节系统,风箱,空气循环风机,加热系统,冷却系统。本发明可通过收缩调节系统,改变隔膜横向纵向收缩率,降低隔膜使用时的热收缩率,避免发生正负极连接短路现象,提高电池安全性能。(The invention provides a transverse drawing shrinkage shaping device for a wet lithium battery diaphragm. This wet process lithium battery diaphragm violently draws shrink setting device, including the entry sprocket, the clamp is closed to the membrane clamp, and the clamp is opened to the membrane clamp, export sprocket, chain, clip, shrink governing system, bellows, air cycle fan, heating system, cooling system. According to the invention, the transverse and longitudinal shrinkage rate of the diaphragm can be changed through the shrinkage adjusting system, the thermal shrinkage rate of the diaphragm in use is reduced, the phenomenon of short circuit of the connection of the positive electrode and the negative electrode is avoided, and the safety performance of the battery is improved.)

1. The wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device is characterized by comprising an inlet chain wheel (1), a chain (3), a clamp (4), an air box (5), an air circulating fan (6), a heating system (7), a cooling system (8), a track (10) and an outlet chain wheel (12), wherein the inlet chain wheel (1) and the outlet chain wheel (12) are respectively placed at two ends of the device to drive the chain (3) to move, the chain (3) is provided with the clamp (4) and is installed on the track (10), and two groups of chains (3), the track (10), the inlet chain wheel (1) and the outlet chain wheel (12) are respectively arranged at two sides of the device; a diaphragm (13) is arranged between the two rails (10), air boxes (5) are arranged on the upper side and the lower side of the diaphragm (13), and the air boxes (5) are divided into a preheating area air box, a stretching area air box, a heat setting area air box, a contraction area air box, a transition area air box and a cooling area air box; the air circulating fan (6) is arranged in the center of the rails (10) at the two sides and is respectively connected with the heating system (7) and the cooling system (8).

2. The wet lithium battery diaphragm transverse drawing shrinkage sizing device as claimed in claim 1, wherein the inlet chain wheel (1) and the outlet chain wheel (12) drive the chain (3) to meet the transmission speed of 40-100 m/min.

3. The wet-process lithium battery diaphragm transverse pulling shrinkage sizing device is characterized by further comprising a diaphragm clamping closing clamp (2) arranged at the front end of the air box (5) and a diaphragm clamping opening clamp (11) arranged at the rear end of the air box (5); the film clamp closing and opening device (2) adopts a magnetic device, and the film clamp opening and closing device (11) is a magnetic and mechanical pre-opening device.

4. The wet lithium battery diaphragm transverse drawing shrinkage setting device is characterized in that the pitch of the clips (4) meets 30-50mm, and the clips are provided with oil splashing prevention covers.

5. The wet lithium battery diaphragm transverse drawing shrinkage sizing device according to claim 1, wherein the preheating zone bellows length is 4-8m, the stretching zone bellows length is 6-12m, the heat setting zone bellows length is 6-12m, the shrinking zone bellows length is 6-12m, the transition zone bellows length is 2-4m, and the cooling zone bellows length is 4-8 m.

6. The wet-process lithium battery diaphragm transverse-pulling shrinkage setting device according to claim 5, wherein the heating system (7) and the cooling system (8) provide a certain temperature for the bellows (5), wherein the temperatures of the preheating stage bellows, the transverse-stretching stage bellows, the heat-setting stage bellows, the transverse-longitudinal shrinkage stage bellows and the transition stage bellows satisfy 80-160 ℃ ± 0.5 ℃, and the temperature of the cooling stage bellows satisfies 20-30 ℃ ± 1 ℃.

7. The wet lithium battery diaphragm transverse pulling shrinkage sizing device is characterized by further comprising a shrinkage adjusting system (9), wherein the shrinkage adjusting system (9) is arranged on the rail (10); the contraction adjusting system (9) can adjust the transverse contraction amplitude of the diaphragm to be less than or equal to 20 percent and the longitudinal contraction amplitude to be less than or equal to 10 percent by adjusting the stretching angle and the retraction angle of the variable-direction path of the track (10).

8. The wet lithium battery diaphragm transverse pulling shrinkage shaping device according to claim 7, wherein the stretching angle of the rail (10) is less than or equal to 15 degrees and the retraction angle is less than or equal to 15 degrees during transverse stretching.

9. The wet lithium battery diaphragm transverse pulling shrinkage setting device as claimed in claim 1, wherein the hardness value of the rail (10) meets 600-750 HV.

Technical Field

The invention relates to the technical field of wet-process lithium battery diaphragm production, in particular to a wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device.

Background

The diaphragm plays a role in separating the anode and the cathode in the charge and discharge process of the lithium ion battery, preventing the two electrodes from contacting and short-circuiting, absorbing enough electrolyte, providing enough electrolyte lithium ion channels, having a micropore self-closing protection function and the like. The lithium ion conductivity of the separator is directly related to the overall performance of the lithium ion battery, and the performance of the separator determines the interface structure of the battery, the retentivity of electrolyte, the internal resistance of the battery and the like, so that the important characteristics of the battery, such as capacity, cycle performance, charge-discharge current density, safety and the like, are influenced.

Existing wet separator manufacturing methods generally include: batching and casting → bidirectional stretching → extraction → transverse stretching → rolling inspection. And (4) extracting and drying the oil film to obtain a microporous diaphragm, and transversely stretching the microporous diaphragm until rolling and inspecting. After extraction and drying, the diaphragm cannot completely release internal stress after being transversely stretched at a certain temperature, so that the high-temperature heat shrinkage rate is increased when the diaphragm is installed in a battery for use, the phenomenon of contact short circuit of a positive electrode and a negative electrode is caused, and the safety of the battery is reduced.

In view of this, it is especially important in the field of wet-process lithium battery diaphragm production to design a wet-process lithium battery diaphragm transversely-drawing shrinkage shaping device.

Disclosure of Invention

The invention aims to provide a transverse drawing shrinkage shaping device for a wet lithium battery diaphragm, which aims to solve the problem that in the prior art, the diaphragm cannot completely release internal stress, so that the high-temperature thermal shrinkage rate of the diaphragm is increased, and the short circuit of a positive electrode and a negative electrode is caused.

For solving above-mentioned technical problem, a wet process lithium cell diaphragm violently draws shrink setting device, its characterized in that, including the entry sprocket, the clamp is closed to the membrane clamp, the chain, the clip, bellows, air cycle fan, heating system, cooling system, shrink governing system, the track, the clamp is opened to the membrane clamp, export sprocket, the diaphragm, entry sprocket and export sprocket place respectively at the both ends of device, drive the chain motion, the chain on be equipped with the clip, and install on the track, the track in the middle of be equipped with the diaphragm, the upper and lower both sides of diaphragm place bellows, the front end and the rear end of bellows place the clamp respectively and close the clamp and the clamp is opened to the membrane clamp, air cycle fan place in both sides track center department, and connect heating system and cooling system respectively, the track on be equipped with shrink governing system.

Preferably, the inlet chain wheel and the outlet chain wheel drive the chain to meet the transmission speed of 40-100 m/min.

Preferably, the membrane clip closing device is a magnetic device and the membrane clip opening device is a magnetic and mechanical pre-opening device.

Preferably, the clip pitch is 30-50mm with an oil splash guard.

More preferably, the windbox of the apparatus is divided into a preheating zone windbox, a stretching zone windbox, a heat-setting zone windbox, a shrinking zone windbox, a transition zone windbox and a cooling zone windbox, wherein the preheating zone windbox has a length of 4 to 8m, the stretching zone windbox has a length of 6 to 12m, the heat-setting zone windbox has a length of 6 to 12m, the shrinking zone windbox has a length of 6 to 12m, the transition zone windbox has a length of 2 to 4m, and the cooling zone windbox has a length of 4 to 8 m.

Further, the heating system and the cooling system can provide a certain temperature for the bellows, wherein the temperature of the bellows in the preheating stage, the bellows in the transverse stretching stage, the bellows in the heat setting stage, the bellows in the transverse longitudinal contraction stage and the bellows in the transition stage can meet (80-160) ° C +/-0.5 ℃, and the temperature of the bellows in the cooling stage can meet (20-30) ° C +/-1 ℃.

Preferably, the contraction adjusting system can adjust the transverse contraction amplitude of the diaphragm to be less than or equal to 20% and the longitudinal contraction amplitude to be less than or equal to 10% by adjusting the stretching angle and the retracting angle of the track direction changing path.

Preferably, the stretching angle of the track is less than or equal to 15 degrees and the retraction angle is less than or equal to 15 degrees during transverse stretching.

Further, the hardness value of the track meets 600-750 HV.

Compared with the prior art, the invention has the beneficial effects that:

the diaphragm is accomplishing horizontal drawing shrink design in-process through the device, can be in proper order through preheating, tensile, heat setting, horizontal longitudinal shrinkage, transition and cooling, can release self inside residual stress completely, and high temperature thermal shrinkage rate becomes high when avoiding the later stage to use, arouses the phenomenon of positive negative pole connection short circuit, can promote battery security.

Drawings

FIG. 1 is a schematic diagram of a wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device according to the present invention;

FIG. 2 is a structural diagram of a wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device according to the present invention;

the reference numbers in the figures are: 1-inlet chain wheel, 2-membrane clamping and closing clamp, 3-chain, 4-clamp, 5-bellows, 6-air circulating fan, 7-heating system, 8-cooling system, 9-contraction adjusting system, 10-track, 11-membrane clamping and opening clamp, 12-outlet chain wheel and 13-diaphragm.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the wet-process lithium battery diaphragm transverse-pulling contraction shaping device comprises an inlet chain wheel 1, a film clamping and clamping device 2, a chain 3, a clamp 4, a bellows 5, an air circulation fan 6, a heating system 7, a cooling system 8, a contraction adjusting system 9, a track 10, a film clamping and clamping device 11, an outlet chain wheel 12, the inlet chain wheel 1 and the outlet chain wheel 12 are respectively arranged at two ends of the device to drive the chain 3 to move, the chain 3 is provided with a clamp 4, and is arranged on a track 10, a diaphragm 13 is arranged in the middle of the track 10, bellows 5 are arranged at the upper side and the lower side of the diaphragm 13, the front end and the rear end of the air box 5 are respectively provided with a film clamping and closing device 2 and a film clamping and opening device 11, the air circulating fan 6 is arranged at the center of the rails 10 at the two sides, and are respectively connected with a heating system 7 and a cooling system 8, and a contraction adjusting system 9 is arranged on the track 10.

It should be noted that the inlet sprocket 1 and the outlet sprocket 12 can drive the chain 3 to meet the transmission speed of 40-100 m/min.

According to the wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device, the diaphragm clamping and closing clamp 2 is a magnetic device, and the diaphragm clamping and opening clamp 11 is a magnetic and mechanical pre-opening device.

According to the wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device, the pitch of the clamps 4 meets 30-50mm, and the clamps are provided with the oil splashing prevention cover.

According to the wet-process lithium battery diaphragm transverse-pulling shrinkage setting device, a wind box 5 is divided into a preheating area wind box, a stretching area wind box, a heat setting area wind box, a shrinking area wind box, a transition area wind box and a cooling area wind box, wherein the length of the preheating area wind box is 4-8m, the length of the stretching area wind box is 6-12m, the length of the heat setting area wind box is 6-12m, the length of the shrinking area wind box is 6-12m, the length of the transition area wind box is 2-4m, and the length of the cooling area wind box is 4-8 m.

A wet-process lithium battery diaphragm transverse-pulling shrinkage setting device is characterized in that a heating system 7 and a cooling system 8 can provide a certain temperature for an air box 5, wherein the temperature of the air box in a preheating stage, the temperature of the air box in a transverse stretching stage, the temperature of the air box in a heat setting stage, the temperature of the air box in a transverse longitudinal shrinkage stage and the temperature of the air box in a transition stage meet (80-160) ° C +/-0.5 ℃, and the temperature of the air box in a cooling stage meet (20-30).

According to the wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device, the shrinkage adjusting system 9 adjusts the stretching angle and the retraction angle of the variable-direction path of the track 10, so that the transverse shrinkage amplitude of the diaphragm is adjustable to be less than or equal to 20%, and the longitudinal shrinkage amplitude of the diaphragm is adjustable to be less than or equal to 10%.

According to the wet-process lithium battery diaphragm transverse-pulling shrinkage shaping device, the stretching angle of a track 10 is not more than 15 degrees during transverse stretching

According to the wet-method lithium battery diaphragm transverse-pulling shrinkage shaping device, the hardness value of the track (10) meets 600-750 HV.

Example 1

(1) The rotating speed of the inlet chain wheel and the outlet chain wheel driving the chain is 40m/min

(2) Clip pitch 40mm

(3) The stretching angle and the retracting angle of the orbit in the transverse stretching stage are set to be 12 DEG

(4) The transverse contraction amplitude is set to be 15 percent, and the longitudinal contraction amplitude is set to be 5 percent

(5) The length of the bellows in the preheating zone was 6m, the length of the bellows in the transverse stretching zone was 9m, the length of the bellows in the heat-setting zone was 9m, the length of the bellows in the transverse longitudinal contraction zone was 9m, the length of the bellows in the transition zone was 3m, and the cooling stage time was 6m

(6) The temperature of the windbox in the preheating stage is set to be 160 +/-0.5 ℃, the temperature of the windbox in the transverse stretching stage is set to be 160 +/-0.5 ℃, the temperature of the windbox in the heat setting stage is set to be 160 +/-0.5 ℃, the temperature of the windbox in the transverse longitudinal contraction stage is set to be 160 +/-0.5 ℃, the temperature of the windbox in the transition stage is set to be 160 +/-0.5 ℃, and the temperature of the windbox in the cooling stage is set to be 30 +/-1 DEG C

(7) Hardness value of rail material is 600HV

Example 2

(1) The rotating speed of the inlet chain wheel and the outlet chain wheel driving the chain is 70m/min

(2) Clip pitch 40mm

(3) The stretching angle and the retracting angle of the track in the transverse stretching stage are set to be 15 DEG

(4) Setting the transverse contraction amplitude to be 20 percent and the longitudinal contraction amplitude to be 10 percent

(5) The length of the bellows in the preheating zone is 4m, the length of the bellows in the transverse stretching zone is 6m, the length of the bellows in the heat setting zone is 6m, the length of the bellows in the transverse and longitudinal contraction zone is 6m, the length of the bellows in the transition zone is 2m, and the cooling stage time is 4m

(6) The temperature of the bellows in the preheating stage is set to be 80 +/-0.5 ℃, the temperature of the bellows in the transverse stretching stage is set to be 80 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 80 +/-0.5 ℃, the temperature of the bellows in the transverse longitudinal contraction stage is set to be 80 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 80 +/-0.5 ℃, and the temperature of the bellows in the cooling stage is set to be 20 +/-1 DEG C

(7) Hardness value selection of material of rail 700HV

Example 3

(1) The rotating speed of the chain driven by the inlet chain wheel and the outlet chain wheel is 100m/min

(2) Clip pitch 40mm

(3) The stretching angle of the track during the transverse stretching phase is set to 10 degrees, and the retraction angle is set to 10 degrees

(4) The transverse contraction amplitude is set to be 15 percent, and the longitudinal contraction amplitude is set to be 8 percent

(5) The length of the bellows in the preheating zone is 8m, the length of the bellows in the transverse stretching zone is 12m, the length of the bellows in the heat setting zone is 12m, the length of the bellows in the transverse and longitudinal contraction zone is 12m, the length of the bellows in the transition zone is 4m, and the cooling stage time is 8m

(6) The temperature of the bellows in the preheating stage is set to be 132 +/-0.5 ℃, the temperature of the bellows in the transverse stretching stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 138 +/-0.5 ℃, the temperature of the bellows in the transverse longitudinal contraction stage is set to be 134 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 130 +/-0.5 ℃, and the temperature of the bellows in the cooling stage is set to be 22 +/-1 DEG C

(7) Hardness value selection of rail material 750HV

Comparative example 1

(1) The inlet chain wheel and the outlet chain wheel drive the chain to rotate at a speed of 50m/min

(2) Clip pitch 40mm

(3) The stretching angle and the retracting angle of the track in the transverse stretching stage are set to be 0 DEG

(4) Setting the transverse contraction amplitude of 0 percent and the longitudinal contraction amplitude of 0 percent

(5) The length of the bellows in the preheating zone is 4m, the length of the bellows in the transverse stretching zone is 6m, the length of the bellows in the heat setting zone is 6m, the length of the bellows in the transverse and longitudinal contraction zone is 6m, the length of the bellows in the transition zone is 2m, and the cooling stage time is 4m

(6) The temperature of the bellows in the preheating stage is set to 130 +/-0.5 ℃, the temperature of the bellows in the stretching stage is set to 133 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to 135 +/-0.5 ℃, the temperature of the bellows in the transverse and longitudinal shrinkage stage is set to 133 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to 130 +/-0.5 ℃, and the temperature of the bellows in the cooling stage is set to 25 +/-1 DEG C

(7) Hardness value of rail material is 600HV

Comparative example 2

(1) The rotating speed of the inlet chain wheel and the outlet chain wheel driving the chain is 70m/min

(2) Clip pitch 40mm

(3) The stretching angle and the retracting angle of the track in the transverse stretching stage are set to be 0 DEG

(4) Setting the transverse contraction amplitude of 0 percent and the longitudinal contraction amplitude of 0 percent

(5) The length of the bellows in the preheating zone was 6m, the length of the bellows in the transverse stretching zone was 9m, the length of the bellows in the heat-setting zone was 9m, the length of the bellows in the transverse longitudinal contraction zone was 9m, the length of the bellows in the transition zone was 3m, and the cooling stage time was 6m

(6) The temperature of the bellows in the preheating stage is set to be 132 +/-0.5 ℃, the temperature of the bellows in the stretching stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the heat setting stage is set to be 138 +/-0.5 ℃, the temperature of the bellows in the transverse and longitudinal shrinkage stage is set to be 135 +/-0.5 ℃, the temperature of the bellows in the transition stage is set to be 130 +/-0.5 ℃, and the temperature of the bellows in the cooling stage is set to be 25 +/-1 DEG C

(7) Hardness value selection of rail material 750HV

Table 1 results of performance testing

The transverse stretching and shrinking shaping process after the extraction of the wet lithium battery separator is described above for helping understanding of the present invention, but the embodiments of the present invention are not limited by the above examples, and any changes, modifications, substitutions, combinations, and simplifications that do not depart from the principle of the present invention shall be equivalent substitutions, and shall be included in the protection scope of the present invention.