A battery core structure with a supporting core and a winding device thereof

Abstract

The present invention discloses a battery cell structure with a support core and a winding device thereof, including a bare battery cell, wherein the bare battery cell includes a positive electrode sheet, a negative electrode sheet and a diaphragm for winding the positive and negative electrode sheets, wherein a support core is arranged at the inner center of the diaphragm, and the diaphragm and the support core are arranged as an integrated structure. The present invention completely eliminates the gap between the positive and negative electrode sheets formed by the lack of support in the inner ring of the wound battery cell, thereby avoiding the risk of lithium deposition and battery fire caused by the gap; completely solves the risk of the diaphragm falling out when the battery cell and the winding needle fall out and when the needle is pulled out; completely solves the problem of misalignment of the pole ear caused by the deviation of the winding needle diameter; avoids the problem of high equipment complexity caused by the use of the inner ring glue sticking process; the support core is easy to load; and it is simple to change the battery cell of different sizes.

Description

Technical Field

[0001] The invention relates to the field of automotive power lithium batteries, energy storage lithium batteries or sodium battery structures, and in particular to a battery core structure with a supporting core and a winding device thereof. Background Art

[0002] The structure of automotive power lithium battery cells is divided into stacked cells and wound cells according to different processing technologies. At present, wound cells are still the mainstream. There are two inherent defects in the current wound cells. One is that after the winding needle is pulled out after winding, after hot pressing or cold pressing, the positive and negative electrode sheets and diaphragms in the center will form a large gap at the corner of the cell due to the loss of support. The gap between the positive and negative electrode sheets will lead to the risk of lithium precipitation during charging. The gradual growth of lithium dendrites will lead to piercing the diaphragm, which will further lead to the risk of thermal runaway. There are two main solutions at present. One is to wind the negative electrode sheet one more time at the beginning, but it cannot form an effective support; the other method is to apply glue at the corner of the first circle of positive electrode sheets, but the glue makes the equipment complicated, and only forms the positive and negative electrode sheets isolation in the first layer, which cannot completely avoid the risk of gaps between the positive and negative electrode sheets. The second inherent defect of the wound cell is that when the winding needle is pulled out from the bare cell after winding, the inner circle of the diaphragm will be taken out with the winding needle, causing defects. In addition to the inherent defects of the current wound battery cells, the diaphragm must pass through the winding needle, and the winding needle must clamp the diaphragm while tensioning it outward. The entire winding needle design and the support mechanism at the end of the winding needle are relatively complicated, resulting in complex structure and control of the equipment. Summary of the invention

[0003] The main technical problem solved by the present invention is to provide a battery cell structure with a supported inner core and a winding device thereof, which completely eliminates the gap between the positive and negative electrode sheets formed due to the lack of support in the inner ring of the wound battery cell, thereby avoiding the risk of lithium deposition and battery fire caused by the gap; completely solves the risk of the battery cell and the winding needle coming out and the diaphragm coming out when the needle is pulled out; completely solves the problem of ear misalignment caused by the deviation of the winding needle diameter; avoids the problem of high equipment complexity caused by the use of the inner ring gluing process; the supporting inner core is easy to load; and it is simple to change to battery cells of different sizes.

[0004] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a battery cell structure with a supporting core, including a bare battery cell, the bare battery cell includes a positive electrode sheet, a negative electrode sheet and a diaphragm for winding the positive and negative electrode sheets, a supporting core is arranged at the center of the inner layer of the diaphragm, and the diaphragm and the supporting core are arranged as an integrated structure.

[0005] In a preferred embodiment of the present invention, the supporting core is arranged in a racetrack-shaped structure, has a thickness of 20-200 μm, and is made of PP, PE or PET.

[0006] In a preferred embodiment of the present invention, the diaphragm and the supporting core are formed into an integrated structure by hot melting or ultrasonic welding, preferably ultrasonic welding.

[0007] Provided is a winding device for a battery core structure with a supporting inner core, comprising a frame, a silo, a pushing mechanism, a feeding mechanism, a side shifting mechanism, a feeding mechanism, a lifting mechanism, an ultrasonic welding mechanism and a winding mechanism, wherein the silo is transversely arranged above the frame through a mounting seat, a longitudinally distributed feeding trough is arranged at the lower part of the feeding side of the silo, the pushing mechanism is arranged on the silo, the feeding mechanism is arranged on the feeding side of the silo, the side shifting mechanism is arranged on one side below the feeding mechanism, the feeding mechanism and the lifting mechanism are arranged on both sides of the side shifting mechanism opposite to each other, the winding mechanism is arranged above the lifting mechanism, and the ultrasonic welding mechanism is arranged on one side of the winding mechanism.

[0008] In a preferred embodiment of the present invention, the pushing mechanism is provided with two groups, including a first pushing mechanism and a second pushing mechanism, the first pushing mechanism includes a first servo module, a first rodless cylinder and a first pushing arm, the second pushing mechanism includes a second servo module, a second rodless cylinder and a second pushing arm, the first servo module and the second servo module are arranged in parallel at the top and bottom of the silo, the first rodless cylinder and the second rodless cylinder are arranged in parallel on the same side and are respectively arranged vertically on the first servo module and the second servo module, the first pushing arm is arranged at the driving end of the lower part of the first rodless cylinder and is located in the silo, and the second pushing arm is arranged at the driving end of the upper part of the second rodless cylinder and is located in the silo.

[0009] In a preferred embodiment of the present invention, the unloading mechanism includes a first unloading cylinder, a second unloading cylinder and a unloading rod, the first unloading cylinder is longitudinally fixed on one side of the silo, the second unloading cylinder is vertically arranged at the driving end of the first unloading cylinder, and the driving end of the second unloading cylinder is provided with a unloading rod facing the unloading trough.

[0010] In a preferred embodiment of the present invention, the side shift mechanism includes a feeding platform, a first screw module, a push plate and a baffle. The feeding platform is transversely fixed on a mounting seat below the feeding trough. Guide grooves that pass through the feeding platform in parallel are arranged vertically. The first screw module is transversely arranged below the feeding platform and parallel to the guide groove. A positioning plate that passes through the guide groove and is located above the feeding platform is provided at the driving end of the first screw module. A longitudinally distributed push plate is fixed on the positioning plate. A baffle parallel to the push plate is provided on the edge side of the feeding platform.

[0011] In a preferred embodiment of the present invention, the feeding mechanism is arranged on one side of the mounting base, and includes a second screw module and a push claw. The second screw module is distributed laterally and is arranged vertically with the first screw module. The driving end of the second screw module is laterally parallel to a push claw that moves in the same direction. The push claw is located above the unloading platform and is arranged corresponding to the inner side of the baffle.

[0012] In a preferred embodiment of the present invention, the lifting mechanism includes a positioning plate, a rotating positioning seat, a slide rail, a rubber suction nozzle, a positioning shaft, a servo motor and a shift fork. The positioning plate is distributed longitudinally and arranged parallel to the baffle. The center of the rotating positioning seat is arranged on the top corner of the positioning plate on one side of the baffle through a rotating shaft. The positioning plate is provided with a C-shaped track clockwise that is flush with the rotating positioning seat horizontally and vertically. The slide rail is slidably arranged on the rotating positioning seat and a rubber suction nozzle is arranged on one side of the baffle, and a positioning shaft located in the C-shaped track is vertically arranged on the other side. The servo motor is vertically arranged on the inner side of the C-shaped track of the positioning plate and a shift fork parallel to the positioning plate is arranged at the driving end through the positioning plate, and the recessed groove at the movable end of the shift fork corresponds to the positioning shaft.

[0013] The beneficial effects of the present invention are as follows: a battery cell structure with a supported inner core and a winding device thereof pointed out by the present invention completely eliminate the gap between the positive and negative electrode sheets formed due to the lack of support in the inner ring of the wound battery cell, thereby avoiding the risk of lithium deposition and battery fire caused by the gap; completely solve the risk of the battery cell and the winding needle coming out and the diaphragm coming out when the needle is pulled out; completely solve the problem of ear misalignment caused by the deviation of the winding needle diameter; avoid the problem of high equipment complexity caused by the use of the inner ring gluing process; the supporting inner core is easy to load; and it is simple to change to batteries of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0015] Figure 1 It is a schematic structural diagram of a separator and a supporting core of a preferred embodiment of a battery core structure with a supporting core and a winding device thereof according to the present invention;

[0016] Figure 2 It is a three-dimensional diagram of a winding device of a preferred embodiment of a battery core structure with a supporting core and a winding device thereof according to the present invention;

[0017] Figure 3 It is a three-dimensional diagram of the installation position of the feeding mechanism of a preferred embodiment of a battery core structure with a supporting core and a winding device thereof of the present invention;

[0018] Figure 4 yes Figure 3 A front view of

[0019] Figure 5 It is a three-dimensional diagram of a feeding mechanism of a preferred embodiment of a battery core structure with a supporting core and a winding device thereof according to the present invention;

[0020] Figure 6 It is a three-dimensional diagram of a lifting mechanism of a preferred embodiment of a battery core structure with a supporting core and a winding device thereof according to the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0022] See also Figure 1 As shown, the embodiment of the present invention includes:

[0023] A battery cell structure with a support core and its winding equipment, including a bare battery cell, the bare battery cell including a positive electrode sheet, a negative electrode sheet and a diaphragm 1 for winding the positive and negative electrode sheets, a support core 2 is arranged at the center of the inner layer of the diaphragm 1, and the diaphragm 1 and the support core 2 are ultrasonically welded to form an integrated structure, the support core 2 is arranged in a runway-shaped structure, the thickness is 20-200μm, and the material is PP, PE, PET or similar materials, so that after cold pressing or hot pressing, an effective support is formed for the diaphragm 1 and the positive and negative electrode sheets to avoid the gap formed in the inner circle of the positive and negative electrode sheets. In addition, when the bare battery cell is removed from the winding needle, since the diaphragm 1 is isolated by the support core 2 and the winding needle, the risk of the diaphragm 1 being taken out with the winding needle is avoided.

[0024] See also Figure 2-Figure 6 As shown, an embodiment of the present invention includes: a winding device applied to a battery core structure with a supporting core, including a frame 3, a hopper 4, a pushing mechanism, a unloading mechanism, a side shifting mechanism, a feeding mechanism, a lifting mechanism, an ultrasonic welding mechanism 5 and a winding mechanism 6.

[0025] The silo 4 is transversely arranged above the frame 3 through a mounting seat 7, and 100 supporting cores 2 are placed in the silo 4 at a time. A longitudinally distributed feeding trough 8 is arranged at the lower part of the feeding side of the silo 4 to realize the feeding of one supporting core 2.

[0026] The pushing mechanism (manipulator) is arranged on the silo 4 and is used to continuously push the supporting inner core 2 forward.

[0027] The pushing mechanism is provided with two groups, including a first pushing mechanism and a second pushing mechanism. The first pushing mechanism includes a first servo module 9, a first rodless cylinder 10 and a first pushing arm 11, and the second pushing mechanism includes a second servo module 12, a second rodless cylinder 13 and a second pushing arm 14.

[0028] The first servo module 9 and the second servo module 12 are arranged in parallel at the top and bottom of the silo 4, and are used to drive along the feeding direction of the silo 4. The first rodless cylinder 10 and the second rodless cylinder 13 are arranged in parallel on the same side and are respectively arranged vertically on the first servo module 9 and the second servo module 12, and are located on both sides of the silo 4. The first pusher arm 11 is arranged at the driving end of the lower part of the first rodless cylinder 10 and is located in the silo 4. The second pusher arm 14 is arranged at the driving end of the upper part of the second rodless cylinder 13 and is located in the silo 4. The first pusher arm 11 drives 100 supporting cores 2 forward, and the second pusher arm 14 returns to the end to wait for the next batch of supporting cores 2 to be placed.

[0029] The unloading mechanism is arranged at the unloading side of the silo 4 , and comprises a first unloading cylinder 15 , a second unloading cylinder 16 and a unloading rod 17 .

[0030] The first unloading cylinder 15 is longitudinally fixed to one side of the silo 4 for driving the longitudinal movement. The second unloading cylinder 16 is vertically arranged at the driving end of the first unloading cylinder 15. The driving end of the second unloading cylinder 16 is provided with an unloading rod 17 facing the unloading chute 8. The unloading rod 17 is driven by the second unloading cylinder 16 to be inserted into the unloading chute 8 and driven down by the first unloading cylinder 15 to unload a supporting core 2 from the unloading chute 8.

[0031] The side shift mechanism includes a material unloading platform 18 , a first screw module 19 , a push plate 20 and a baffle 21 .

[0032] The unloading platform 18 is transversely fixed on the mounting seat 7 below the unloading trough 8, and is used to receive the unloading support core 2. The unloading platform 18 is provided with a guide groove 22 that runs through the upper and lower parts in parallel, the first screw module 19 is transversely arranged below the unloading platform 18 and is arranged parallel to the guide groove 22, the driving end of the first screw module 19 is provided with a positioning plate 23 that passes through the guide groove 22 and is located above the unloading platform 18, the positioning plate 23 is fixed with a longitudinally distributed push plate 20, and the edge side of the unloading platform 18 is provided with a baffle plate 21 that is parallel to the push plate 20, and the first screw module 19 drives the push plate 20 to send the support core 2 to the side of the baffle plate 21.

[0033] The feeding mechanism and the lifting mechanism are arranged opposite to each other on both sides of the lateral movement mechanism, and the supporting core 2 is fed to one side of the lifting mechanism for adsorption and fixation through the feeding mechanism.

[0034] The feeding mechanism is arranged on one side of the mounting seat 7 , and includes a second screw module 24 and a push claw 25 .

[0035] The second screw module 24 is distributed laterally and is arranged vertically with the first screw module 19. The driving end of the second screw module 24 is laterally and parallelly provided with a push claw 25 that moves in the same direction. The push claw 25 is located above the unloading platform 18 and is arranged corresponding to the inner side of the baffle 21. The second screw module 24 drives the push claw 25 to send the support core 2 on the unloading platform 18 to the side of the lifting mechanism for easy adsorption and fixation.

[0036] The lifting mechanism includes a positioning plate 26 , a rotating positioning seat 27 , a slide rail 28 , a rubber suction nozzle 29 , a positioning shaft 30 , a servo motor 31 and a shift fork 32 .

[0037] The positioning plate 26 is longitudinally distributed and arranged parallel to the baffle 21. The center of the rotating positioning seat 27 is arranged on the top corner of the positioning plate 26 on one side of the baffle 21 through a rotating shaft, and can be rotated at any angle to achieve the function of changing direction positioning. The positioning plate 26 is provided with a C-shaped track 33 which is flush with the rotating positioning seat 27 in the horizontal direction and in the vertical direction in the clockwise direction. The slide rail 28 is slidably provided on the rotating positioning seat 27 and a rubber suction nozzle 29 is provided on one side of the baffle plate 21. The support core 2 is fixed by vacuum adsorption of the rubber suction nozzle 29. A positioning shaft 30 located in the C-shaped track 33 is vertically provided on the other side. The servo motor 31 is vertically provided on the inner side of the C-shaped track 33 of the positioning plate 26 and a fork 32 which is parallel to the positioning plate 26 is provided at the driving end through the positioning plate 26. The recessed groove 34 at the movable end of the fork 32 clamps the positioning shaft 30 correspondingly. The servo motor 31 drives the fork 32 to drive the positioning shaft 30 to move along the C-shaped track 33, and drives from the horizontal end to the longitudinal end, thereby driving the slide rail 28 from horizontal movement to longitudinal movement, and realizing the upward movement and lifting of the rubber suction nozzle 29 end of the slide rail 28.

[0038] The winding mechanism 6 (existing product) is arranged above the lifting mechanism. The winding needle of the winding mechanism adopts an inflatable structure inside. The diameter can be changed by an airbag, and the appropriate tensioning force on the supporting core can be adjusted by controlling the air pressure. By extending the winding needle, the winding needle uses appropriate tensioning force to fix the supporting core 2, and the diameter of the winding needle moves with the supporting core 2, which effectively avoids the problem of misalignment of the pole ear caused by the deterioration of the winding needle diameter.

[0039] The ultrasonic welding mechanism 5 (existing product) is arranged on one side of the winding mechanism 6, and ultrasonic waves are used to weld the diaphragm 1 and the supporting core 2 together, thereby avoiding a complicated winding needle and film clamping structure.

[0040] In summary, the present invention points out a battery cell structure with a supported inner core and its winding equipment, which completely eliminates the gap between the positive and negative pole pieces formed due to the lack of support in the inner ring of the wound battery cell, thereby avoiding the risk of lithium deposition and battery fire caused by the gap; completely solves the risk of the battery cell and the winding needle coming out and the diaphragm coming out when the needle is pulled out; completely solves the problem of ear misalignment caused by the deviation of the winding needle diameter; avoids the problem of high equipment complexity caused by the use of the inner ring gluing process; the supporting inner core is easy to load; and it is simple to change to different size battery cells.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A winding device for a battery cell structure with a supporting core, wherein the battery cell structure with a supporting core comprises a bare battery cell, wherein the bare battery cell comprises a positive electrode sheet, a negative electrode sheet and a separator for winding the positive and negative electrode sheets, wherein a supporting core is arranged at the center of the inner layer of the separator, and the separator and the supporting core are arranged as an integrated structure, characterized in that: The winding equipment includes a frame, a silo, a pushing mechanism, a unloading mechanism, a side shifting mechanism, a feeding mechanism, a lifting mechanism, an ultrasonic welding mechanism and a winding mechanism. The silo is horizontally arranged above the frame through a mounting seat, and a longitudinally distributed unloading trough is arranged at the lower part of the unloading side of the silo. The pushing mechanism is arranged on the silo, the unloading mechanism is arranged on the unloading side of the silo, the side shifting mechanism is arranged on one side below the unloading mechanism, the feeding mechanism and the lifting mechanism are arranged on both sides of the side shifting mechanism opposite to each other, the winding mechanism is arranged above the lifting mechanism, and the ultrasonic welding mechanism is arranged on one side of the winding mechanism.

2. The winding device of the battery core structure with a supporting core according to claim 1, characterized in that: The supporting core is arranged in a racetrack-shaped structure, has a thickness of 20-200 μm, and is made of PP, PE or PET.

3. The winding device of the battery core structure with a supporting core according to claim 1, characterized in that: The diaphragm and the supporting core are welded by hot melting or ultrasonic welding to form an integrated structure.

4. The winding device of the battery core structure with supporting core according to claim 1, characterized in that: The pushing mechanism is provided with two groups, including a first pushing mechanism and a second pushing mechanism, the first pushing mechanism includes a first servo module, a first rodless cylinder and a first pushing arm, the second pushing mechanism includes a second servo module, a second rodless cylinder and a second pushing arm, the first servo module and the second servo module are arranged in parallel at the top and bottom of the silo, the first rodless cylinder and the second rodless cylinder are arranged in parallel on the same side and are respectively arranged vertically on the first servo module and the second servo module, the first pushing arm is arranged at the driving end of the lower part of the first rodless cylinder and is located in the silo, and the second pushing arm is arranged at the driving end of the upper part of the second rodless cylinder and is located in the silo.

5. The winding device of the battery core structure with supporting core according to claim 1, characterized in that: The unloading mechanism includes a first unloading cylinder, a second unloading cylinder and a unloading rod. The first unloading cylinder is longitudinally fixed on one side of the silo, and the second unloading cylinder is vertically arranged at the driving end of the first unloading cylinder. The driving end of the second unloading cylinder is provided with a unloading rod facing the unloading trough.

6. The winding device of the battery core structure with supporting core according to claim 1, characterized in that: The side shift mechanism includes a feeding platform, a first screw module, a push plate and a baffle. The feeding platform is transversely fixed on a mounting seat below the feeding trough. Guide grooves that pass through the feeding platform in parallel are arranged vertically. The first screw module is transversely arranged below the feeding platform and parallel to the guide groove. A positioning plate that passes through the guide groove and is located above the feeding platform is provided at the driving end of the first screw module. A longitudinally distributed push plate is fixed on the positioning plate. A baffle parallel to the push plate is provided on the edge side of the feeding platform.

7. The winding device of the battery core structure with supporting core according to claim 1, characterized in that: The feeding mechanism is arranged on one side of the mounting seat, and includes a second screw module and a push claw. The second screw module is distributed laterally and arranged vertically with the first screw module. The driving end of the second screw module is laterally and parallelly provided with a push claw that moves in the same direction. The push claw is located above the unloading platform and is arranged corresponding to the inner side of the baffle.

8. The winding device of the battery core structure with supporting core according to claim 1, characterized in that: The lifting mechanism includes a positioning plate, a rotating positioning seat, a slide rail, a rubber suction nozzle, a positioning shaft, a servo motor and a shift fork. The positioning plate is distributed longitudinally and arranged parallel to the baffle. The center of the rotating positioning seat is arranged on the top corner of the positioning plate on one side of the baffle through a rotating shaft. The positioning plate is provided with a C-shaped track clockwise that is flush with the rotating positioning seat horizontally and vertically. The slide rail is slidably arranged on the rotating positioning seat and a rubber suction nozzle is arranged on one side of the baffle, and a positioning shaft located in the C-shaped track is vertically arranged on the other side. The servo motor is vertically arranged on the inner side of the C-shaped track of the positioning plate and a shift fork parallel to the positioning plate is arranged at the driving end through the positioning plate, and the recessed groove at the movable end of the shift fork corresponds to the positioning shaft.

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