Pre-pressing mechanism for improving wrinkles of wound diaphragm

Abstract

The utility model discloses a prepressing mechanism for improving wrinkles of a winding diaphragm, which comprises a base, a side support, an upper side plate, a lower pressing plate, an upper pressing plate, an upper pressing plate driving mechanism, a front heating mechanism and a rear heating mechanism, the upper side plate is horizontally arranged above the base and is fixedly connected with the base through the side support, the lower pressing plate is fixed on the base, and the lower pressing plate is fixed on the base. The upper pressing plate is arranged above the lower pressing plate and driven by the upper pressing plate driving mechanism to ascend and descend in the vertical direction, the front heating mechanism is arranged on the front side of the lower pressing plate to heat the front end of a lithium battery roll core on the lower pressing plate, and the rear heating mechanism is arranged on the rear side of the lower pressing plate to heat the rear end of the lithium battery roll core on the lower pressing plate. The heating mechanisms are respectively arranged on the front side and the rear side of the pre-pressing mechanism of the lithium battery roll core to heat the front end and the rear end of the lithium battery roll core, and a diaphragm is heated to be preliminarily bonded with a pole piece, so that the inner ring diaphragm of the lithium battery roll core is prevented from collapsing due to no tension in the pre-pressing process to cause diaphragm wrinkling.

Description

Technical Field

[0001] The utility model relates to a pre-pressing mechanism, in particular to a pre-pressing mechanism for improving the wrinkles of a winding diaphragm, and belongs to the technical field of lithium battery processing. Background Art

[0002] Winding is a very important process in the manufacture of lithium batteries. In order to increase the energy density per unit volume of lithium batteries, thinner diaphragms are usually used for winding, thereby reducing the volume ratio of the diaphragm to the entire lithium battery. Since the diaphragm is very thin and the material is soft, the diaphragm located on the inner circle of the core is easy to collapse after the lithium battery core is unloaded, causing the diaphragm on the inner circle of the core to wrinkle. The wrinkles will cause the positive and negative electrodes to contact and cause the lithium battery to short-circuit and be scrapped. Although we can minimize the occurrence of this situation by adjusting the pre-pressing method, no matter what method is used for pre-pressing, the occurrence of diaphragm wrinkles cannot be completely eliminated because the lithium battery core is under pressure for a short time. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pre-pressing mechanism for improving the wrinkles of a winding diaphragm, so as to solve the problem of wrinkles of a lithium battery winding core diaphragm.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A pre-pressing mechanism for improving the wrinkles of a wound diaphragm comprises a base, a side bracket, an upper side plate, a lower pressure plate, an upper pressure plate, an upper pressure plate driving mechanism, a front heating mechanism and a rear heating mechanism, wherein the upper side plate is horizontally arranged above the base and fixedly connected to the base through the side bracket, the lower pressure plate is fixed on the base, the upper pressure plate is arranged above the lower pressure plate and is driven by the upper pressure plate driving mechanism to rise and fall in the vertical direction, the front heating mechanism is arranged on the front side of the lower pressure plate to heat the front end of a lithium battery roll core on the lower pressure plate, and the rear heating mechanism is arranged on the rear side of the lower pressure plate to heat the rear end of the lithium battery roll core on the lower pressure plate.

[0006] Furthermore, the front heating mechanism and the rear heating mechanism respectively include a heating mechanism shell, a fan module, an electric heating tube and a heat sink. A fan module mounting hole is opened on one side of the heating mechanism shell close to the lithium battery core. The fan module is arranged in the fan module mounting hole of the heating mechanism shell. An air inlet is arranged on the other side of the heating mechanism shell. The electric heating tube is vertically fixed in the heating mechanism shell, and multiple heat sinks are distributed on the electric heating tube.

[0007] Furthermore, the fan module is composed of two fans arranged in parallel, and the fans draw air toward the outside of the heating mechanism housing.

[0008] Furthermore, the electric heating tube is coiled in an S-shape in the heating mechanism housing.

[0009] Furthermore, the heat sink is provided with through holes matching the electric heating tube, the heat sink is sleeved on the outside of the electric heating tube and fixedly connected to the electric heating tube, and multiple heat sinks are evenly distributed on the electric heating tube from top to bottom.

[0010] Furthermore, the heat sink is an elongated heat sink, the side of the heat sink includes a middle horizontal portion and V-shaped portions on both sides, the through hole of the heat sink is opened on the middle horizontal portion, and the V-shaped portions on both sides are symmetrically arranged on both sides of the middle horizontal portion.

[0011] Furthermore, the air inlet is composed of a plurality of air inlet holes, and the plurality of air inlet holes are distributed on the other side of the heating mechanism housing in a rectangular array or a circular array.

[0012] Furthermore, the upper pressure plate driving mechanism includes a driving cylinder, a first vertical slide rod and a second vertical slide rod. The driving cylinder is vertically fixed on the upper side of the upper side plate. The telescopic rod end of the driving cylinder passes through the upper side plate and is connected to the upper pressure plate and drives the upper pressure plate to rise and fall in the vertical direction. The lower ends of the first vertical slide rod and the second vertical slide rod are fixedly connected to the upper pressure plate. The upper side plate is provided with through holes that match the first vertical slide rod and the second vertical slide rod respectively. The upper ends of the first vertical slide rod and the second vertical slide rod are slidably set in the through holes of the upper side plate.

[0013] Compared with the prior art, the utility model has the following advantages and effects: the utility model arranges heating mechanisms on the front and rear sides of the pre-pressing mechanism of the lithium battery core to heat the front and rear ends of the lithium battery core, and the diaphragm is heated to initially bond with the electrode piece, thereby avoiding the inner ring diaphragm of the lithium battery core from sagging due to the lack of tension during the pre-pressing process, causing the diaphragm to wrinkle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a pre-stressing mechanism for improving the folds of a wound diaphragm according to the utility model.

[0015] Figure 2 It is a schematic diagram of the front heating mechanism and the rear heating mechanism of the utility model.

[0016] Figure 3 It is a side view of the front heating mechanism and the rear heating mechanism of the utility model.

[0017] Figure 4 It is an internal schematic diagram of the front heating mechanism and the rear heating mechanism of the utility model. DETAILED DESCRIPTION

[0018] In order to elaborate on the technical scheme adopted by the utility model to achieve the predetermined technical purpose, the technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a partial embodiment of the utility model, not all of the embodiments, and the technical means or technical features in the embodiment of the utility model can be replaced without paying creative labor. The utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0019] like Figure 1 As shown, the utility model is a pre-pressing mechanism for improving the folds of a wound diaphragm, comprising a base 1, a side bracket 2, an upper side plate 3, a lower pressure plate 4, an upper pressure plate 5, an upper pressure plate driving mechanism, a front heating mechanism 6 and a rear heating mechanism 7. The upper side plate 3 is horizontally arranged above the base 1 and is fixedly connected to the base 1 through the side bracket 2, the lower pressure plate 4 is fixed on the base 1, the upper pressure plate 5 is arranged above the lower pressure plate 4 and is driven by the upper pressure plate driving mechanism to rise and fall in the vertical direction, the front heating mechanism 6 is arranged on the front side of the lower pressure plate 4 to heat the front end of the lithium battery core 8 on the lower pressure plate 4, and the rear heating mechanism 7 is arranged on the rear side of the lower pressure plate 4 to heat the rear end of the lithium battery core 8 on the lower pressure plate 4. When the lithium battery core is pre-pressed, the front heating mechanism 6 and the rear heating mechanism 7 are first turned on to heat the front and rear ends of the lithium battery core, so that the side surfaces of the two ends of the diaphragm are heated and melted, thereby forming a preliminary bond between the diaphragm and the electrode piece. At this time, the upper pressure plate 5 is driven by the upper pressure plate driving mechanism to pre-press the lithium battery core downward. Since the diaphragm and the electrode piece are already bonded, the inner circle diaphragm will not sag due to the tension-free state during the pre-pressing process, effectively avoiding the problem of diaphragm wrinkling during the pre-pressing process.

[0020] like Figure 2 As shown, the front heating mechanism 6 and the rear heating mechanism 7 respectively include a heating mechanism shell 9, a fan module 10, an electric heating tube 11 and a heat sink 12. A fan module mounting hole is opened on the side of the heating mechanism shell 9 close to the lithium battery core 8. The fan module 10 is arranged in the fan module mounting hole of the heating mechanism shell 9. An air inlet is arranged on the other side of the heating mechanism shell 9. The electric heating tube 11 is vertically fixed in the heating mechanism shell 9, and a plurality of heat sinks 12 are distributed on the electric heating tube 11.

[0021] like Figure 3 As shown, the fan module 10 is composed of two fans arranged in parallel, and the fans draw air toward the outside of the heating mechanism housing 9.

[0022] like Figure 4As shown, the electric heating tube 11 is coiled in an S shape in the heating mechanism housing 9. The heat sink 12 is provided with a through hole matching the electric heating tube 11, the heat sink 12 is sleeved on the outside of the electric heating tube 11 and is fixedly connected to the electric heating tube 11, and multiple heat sinks 12 are evenly distributed on the electric heating tube 11 from top to bottom.

[0023] The heat sink 12 is a long strip heat sink, and the side of the heat sink 12 includes a middle horizontal portion and V-shaped portions on both sides. The through hole of the heat sink 12 is opened on the middle horizontal portion, and the V-shaped portions on both sides are symmetrically arranged on both sides of the middle horizontal portion. In this way, the V-shaped portions of the upper and lower heat sinks 12 are stacked up and down to form a V-shaped air duct, which increases the air flow path, thereby extending the contact time between the air and the heat sink, and ensuring the heat of the blown air. In addition, the V-shaped air duct can reduce the wind speed to prevent the diaphragm from being blown by the wind due to excessive wind speed.

[0024] The air inlet is composed of a plurality of air inlet holes, and the plurality of air inlet holes are distributed on the other side of the heating mechanism housing 9 in a rectangular array or a circular array.

[0025] The upper pressure plate driving mechanism includes a driving cylinder 13, a first vertical slide rod 14 and a second vertical slide rod 15. The driving cylinder 13 is vertically fixed on the upper side of the upper side plate 3. The telescopic rod end of the driving cylinder 13 passes through the upper side plate 3 and is connected to the upper pressure plate 5 and drives the upper pressure plate 5 to rise and fall in the vertical direction. The lower ends of the first vertical slide rod 14 and the second vertical slide rod 15 are fixedly connected to the upper pressure plate 5. The upper side plate 3 is provided with through holes that match the first vertical slide rod 14 and the second vertical slide rod 15 respectively. The upper ends of the first vertical slide rod 14 and the second vertical slide rod 15 are slidably set in the through holes of the upper side plate 3.

[0026] The utility model arranges heating mechanisms on the front and rear sides of the pre-pressing mechanism of the lithium battery core to heat the front and rear ends of the lithium battery core. The diaphragm is heated and initially adheres to the pole piece, thereby avoiding the inner ring diaphragm of the lithium battery core from sagging due to tensionlessness during the pre-pressing process, causing diaphragm wrinkles.

[0027] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm, characterized in that: It includes a base, a side bracket, an upper side plate, a lower pressure plate, an upper pressure plate, an upper pressure plate driving mechanism, a front heating mechanism and a rear heating mechanism. The upper side plate is horizontally arranged above the base and is fixedly connected to the base through the side bracket. The lower pressure plate is fixed on the base. The upper pressure plate is arranged above the lower pressure plate and is driven to rise and fall in the vertical direction by the upper pressure plate driving mechanism. The front heating mechanism is arranged on the front side of the lower pressure plate to heat the front end of the lithium battery roll core on the lower pressure plate. The rear heating mechanism is arranged on the rear side of the lower pressure plate to heat the rear end of the lithium battery roll core on the lower pressure plate.

2. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 1, characterized in that: The front heating mechanism and the rear heating mechanism respectively include a heating mechanism shell, a fan module, an electric heating tube and a heat sink. A fan module mounting hole is opened on the side of the heating mechanism shell close to the lithium battery core. The fan module is arranged in the fan module mounting hole of the heating mechanism shell. An air inlet is arranged on the other side of the heating mechanism shell. The electric heating tube is vertically fixed in the heating mechanism shell, and multiple heat sinks are distributed on the electric heating tube.

3. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 2, characterized in that: The fan module is composed of two fans arranged in parallel, and the fans draw air toward the outside of the heating mechanism housing.

4. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 2, characterized in that: The electric heating tube is coiled in an S-shape in the heating mechanism housing.

5. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 4, characterized in that: The heat sink is provided with through holes matching the electric heating tube, the heat sink is sleeved on the outside of the electric heating tube and is fixedly connected to the electric heating tube, and a plurality of heat sinks are evenly distributed on the electric heating tube from top to bottom.

6. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 4, characterized in that: The heat sink is an elongated heat sink, the side of which includes a middle horizontal portion and V-shaped portions on both sides, the through hole of the heat sink is opened on the middle horizontal portion, and the V-shaped portions on both sides are symmetrically arranged on both sides of the middle horizontal portion.

7. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 2, characterized in that: The air inlet is composed of a plurality of air inlet holes, and the plurality of air inlet holes are distributed on the other side of the heating mechanism housing in a rectangular array or a circular array.

8. A pre-stressing mechanism for improving the wrinkles of a wound diaphragm according to claim 1, characterized in that: The upper pressure plate driving mechanism includes a driving cylinder, a first vertical slide rod and a second vertical slide rod. The driving cylinder is vertically fixed on the upper side of the upper side plate. The telescopic rod end of the driving cylinder passes through the upper side plate and is connected to the upper pressure plate and drives the upper pressure plate to rise and fall in the vertical direction. The lower ends of the first vertical slide rod and the second vertical slide rod are fixedly connected to the upper pressure plate. The upper side plate is provided with through holes that match the first vertical slide rod and the second vertical slide rod respectively. The upper ends of the first vertical slide rod and the second vertical slide rod are slidably arranged in the through holes of the upper side plate.

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