CN106711491B - Auxiliary discharging device for round winding needle, battery core winding equipment and battery core forming method - Google Patents
Auxiliary discharging device for round winding needle, battery core winding equipment and battery core forming method Download PDFInfo
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- CN106711491B CN106711491B CN201611257386.XA CN201611257386A CN106711491B CN 106711491 B CN106711491 B CN 106711491B CN 201611257386 A CN201611257386 A CN 201611257386A CN 106711491 B CN106711491 B CN 106711491B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides an auxiliary discharging device for a round winding needle, which comprises a lower positioning structure, a needle drawing stop block, a spreading mechanism, an upper pre-pressing plate and a pre-pressing driving mechanism, wherein the upper pre-pressing plate is used for being propped against the upper side of the outer side of a round cell, and the pre-pressing driving mechanism is used for enabling the upper pre-pressing plate and the lower positioning structure to perform relative opening and closing movement; when the round electric core on the round winding needle mechanism is arranged in the lower positioning structure and is clamped by the needle drawing stop block, and the opening mechanism is arranged on the inner side of the round electric core in an extending mode and is positioned on the inner side or pressed against the upper portion of the outer side of the round electric core by the upper pre-pressing plate, the round winding needle mechanism moves backwards along the axial direction of the round electric core to be separated from the round electric core, the separated round electric core is pre-pressed into an oval electric core under the cooperation of the opening mechanism, the lower positioning structure, the upper pre-pressing plate and the pre-pressing driving mechanism, so that the blanking problem after winding of the ring-shaped winding needle is solved, the problems of wrinkling and edge collapse of an inner ring diaphragm of the oval winding needle are solved, and the circular winding needle has a compact structure. In addition, the invention also discloses a battery core winding device and a battery core forming method.
Description
Technical Field
The invention relates to the field of battery core winding of batteries, in particular to an auxiliary discharging device for a ring-shaped winding needle, battery core winding equipment and a battery core forming method applied to the lithium battery industry.
Background
With the continuous development of economy and the continuous progress of society, various substance consumer products are provided for the production and the living of people, and an electronic product is one of the various substance consumer products.
For electronic products, such as mobile phones, computers, tablets, digital cameras, smart watches, etc., the use of lithium batteries is not separated, so that a good development platform is created for the development of the lithium battery industry.
At present, an elliptical winding needle is generally adopted by a winding machine in the lithium battery industry when a battery cell is wound, and the elliptical winding needle is convenient for prepressing and forming. However, the diameter of the elliptical winding needle at the feeding tangent point is continuously changed in the winding process, so that the winding fluctuation is large, and the linear speeds of the diaphragm and the pole piece are unstable, so that the tension and the alignment degree of the diaphragm and the pole piece are greatly affected in the winding process. Therefore, in order to ensure the product quality, the elliptical winding needle cannot be suitable for high-speed winding occasions, but the linear speed of a winding machine of the elliptical winding needle on the current market can only be below 1m/s, and the elliptical winding needle is difficult to break through.
The circular winding needle can overcome the problem that the elliptical winding needle can generate fluctuation when in winding, so that the winding is stable, the high-speed winding can be realized, and the linear speed can reach more than 1m/s when in winding, thereby improving the production efficiency. However, since the battery cell rolled by the round winding needle is round, the battery cell is stressed imbalancedly after needle extraction or rolls in the moving process, so that the subsequent treatment of the battery cell is affected.
Therefore, there is a strong need for an auxiliary discharging device for a loop winding needle, a cell winding device and a cell forming method to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide an auxiliary discharging device for a circular winding needle, which solves the discharging problem after the circular winding needle is wound, solves the problems of wrinkling and edge collapse of a diaphragm at the inner ring of the elliptical winding needle and has a compact structure.
The invention further aims to provide the battery core winding equipment which solves the blanking problem after the round winding needle is wound, solves the problems of wrinkling and edge collapse of the diaphragm of the inner ring of the elliptical winding needle and has a compact structure.
The invention further aims to provide a battery cell forming method which solves the blanking problem after the round winding needle is wound, solves the problems of wrinkling and edge collapse of the diaphragm of the inner ring of the oval winding needle and has a compact structure.
In order to achieve the above purpose, the auxiliary discharging device for the circular winding needle is used for discharging a circular electric core wound by the circular winding needle mechanism and prepressing the circular electric core into an elliptical electric core, and comprises a lower positioning structure for positioning the lower part of the outer side of the circular electric core, a needle drawing stop block for stopping the circular electric core from moving backwards along the axial direction of the circular electric core, a spreading mechanism for positioning the inner side of the circular electric core, an upper prepressing plate for propping against the upper part of the outer side of the circular electric core and a prepressing driving mechanism for enabling the upper prepressing plate and the lower positioning structure to perform relative opening and closing movement. When the round electric core on the round needle winding mechanism is arranged on the lower positioning structure and is clamped by the needle drawing stop block, and the opening mechanism is arranged on the inner side of the round electric core in an extending mode and is positioned with the inner side or the upper pre-pressing plate is pressed above the outer side of the round electric core in an abutting mode, the round needle winding mechanism moves backwards along the axial direction of the round electric core to be separated from the round electric core, and the separated round electric core is pre-pressed into the elliptical electric core under the cooperation of the opening mechanism, the lower positioning structure, the upper pre-pressing plate and the pre-pressing driving mechanism.
Preferably, in the process that the circular battery cell is pre-pressed into the elliptical battery cell, the opening mechanism opens the inner side of the circular battery cell outwards along the left-right direction of the circular battery cell.
Preferably, the lower positioning structure comprises a left positioning plate and a right positioning plate which are mutually unfolded, folded and pivoted, and the left positioning plate and the right positioning plate are switched between a first position and a second position; when the first position is reached, the left positioning plate and the right positioning plate enclose a V-shaped positioning groove for positioning the circular battery cell on the circular winding needle mechanism; when the left positioning plate and the right positioning plate are in the second position, the left positioning plate and the right positioning plate are mutually flattened to form a flat plate structure; and in the process that the round battery cell is pre-pressed into the elliptical battery cell, the left positioning plate and the right positioning plate are switched from the first position to the second position.
Preferably, the lower positioning structure further comprises a middle positioning plate positioned between the left positioning plate and the right positioning plate, wherein the left side of the middle positioning plate is hinged with the left positioning plate, and the right side of the middle positioning plate is hinged with the right positioning plate; when the left positioning plate is at the first position, the left positioning plate is inclined to the left and the upper sides relative to the middle positioning plate, and the right positioning plate is inclined to the right and the upper sides relative to the middle positioning plate; when the left positioning plate and the right positioning plate are in the second position, the left positioning plate and the right positioning plate are respectively flattened relative to the middle positioning plate, so that the left positioning plate, the middle positioning plate and the right positioning plate form a flat plate structure.
Preferably, the lower positioning structure comprises a movable flat plate, a left positioning block and a right positioning block, wherein the left positioning block is provided with a left inclined surface in interference fit with the left side of the outer side of the circular battery cell, the right positioning block is provided with a right inclined surface in interference fit with the right side of the outer side of the circular battery cell, and the movable flat plate is in interference fit with the lower side of the outer side of the circular battery cell and moves relative to the left positioning block and the right positioning block along the up-down direction; when the battery cell is at the first position, the left inclined plane and the right inclined plane extend out of the movable flat plate so that the outer side of the circular battery cell is positioned among the left inclined plane, the right inclined plane and the movable flat plate; and when the movable flat plate is at the second position, the movable flat plate moves upwards to enable the left inclined plane and the right inclined plane to be separated from and butted with the elliptical battery cell pre-pressed by the circular battery cell.
Preferably, the upper pre-pressing plate comprises a left pressing plate, a middle pressing plate and a right pressing plate, wherein the left side of the middle pressing plate is hinged with the left pressing plate, the right side of the middle pressing plate is hinged with the right pressing plate, the left pressing plate is inclined leftwards and downwards relative to the middle pressing plate, and the right pressing plate is inclined rightwards and downwards relative to the middle pressing plate; in the process that the circular battery cell is pre-pressed into the elliptical battery cell, the left pressing plate and the right pressing plate are respectively flattened relative to the middle pressing plate, so that the left pressing plate, the middle pressing plate and the right pressing plate form a flat plate structure.
In order to achieve the above purpose, the battery cell winding equipment comprises a round winding needle mechanism, a secondary pre-pressing mechanism and a hot press forming mechanism, wherein the round winding needle mechanism is used for winding a diaphragm and a pole piece out of a round battery cell. The secondary prepressing mechanism is used for secondarily prepressing the elliptical electric core, and the hot press forming mechanism is used for hot press forming the secondarily prepressed elliptical electric core into a shaped flat electric core.
Preferably, the circular winding needle mechanism comprises a circular outer winding needle, an inner winding needle and a winding needle driving assembly, wherein the inner winding needle is contained in the circular outer winding needle and forms a circular winding needle, and the winding needle driving assembly drives the circular winding needle to rotate and move along the axial direction of the circular winding needle.
Preferably, the secondary pre-pressing mechanism comprises a secondary pre-pressing upper plate, a secondary pre-pressing lower plate and a secondary pre-pressing driving assembly for driving the secondary pre-pressing upper plate and the secondary pre-pressing lower plate to be matched in an opening-closing manner; the hot-press forming mechanism comprises an upper hot-press plate, a lower hot-press plate, heating elements respectively assembled at the upper hot-press plate and the lower hot-press plate, and a hot-press driving assembly for driving the upper hot-press plate and the lower hot-press plate to be in open-close fit.
In order to achieve the above object, the method for forming a battery cell of the present invention comprises the steps of:
(1) The circular winding needle mechanism winds the diaphragm and the pole piece into a circular battery cell;
(2) The circular winding needle is used for assisting the circular winding needle mechanism to detach the circular battery core on the circular winding needle mechanism, and the detached circular battery core is pre-pressed into an elliptical battery core by the circular winding needle auxiliary discharging device, wherein in the process that the detached circular battery core is pre-pressed into the elliptical battery core, the pre-pressing driving mechanism drives the upper pre-pressing plate and the lower positioning structure to pre-press the circular battery core along the opposite direction, and the expanding mechanism also expands the inner side of the circular battery core outwards along the left-right direction of the circular battery core;
(3) The elliptic battery core is transmitted to a secondary prepressing mechanism, and the secondary prepressing mechanism performs secondary prepressing on the elliptic battery core; and
(4) And the oval battery core after secondary prepressing is transmitted to a hot-press forming mechanism, and the oval battery core after secondary prepressing is hot-pressed into a required flat battery core by the hot-press forming mechanism.
Compared with the prior art, the auxiliary discharging device for the circular winding needle comprises the lower positioning structure for positioning the lower side of the outer side of the circular battery core, the needle drawing stop block for blocking the circular battery core from moving backwards along the axial direction of the circular battery core, the opening mechanism for positioning the inner side of the circular battery core, the upper pre-pressing plate for pressing the upper side of the outer side of the circular battery core and the pre-pressing driving mechanism for enabling the upper pre-pressing plate and the lower positioning structure to do relative opening and closing movement, so that when the circular battery core on the circular winding needle mechanism is arranged in the lower positioning structure and clamped by the needle drawing stop block, and the opening mechanism is stretched to the inner side of the circular battery core and is positioned with the inner side or pressed on the upper pre-pressing plate to the upper side of the outer side of the circular battery core, the circular winding needle mechanism is moved backwards along the axial direction of the circular battery core at the moment to separate the circular winding needle mechanism from the circular battery core, and the discharging problem after the circular winding needle is solved. Meanwhile, the separated round battery cell is preloaded into an oval battery cell when the preloading driving mechanism drives the upper preloading plate and the lower positioning structure to move in opposite directions, and in the process that the round battery cell is preloaded into the oval battery cell, the opening mechanism opens the inner side of the round battery cell outwards along the left and right directions of the round battery cell, so that the problems of wrinkling and edge collapse of the coiled diaphragm in the oval winding needle are solved, and the quality of the battery cell is ensured.
Drawings
Fig. 1 is a schematic structural view of a cell winding apparatus of the present invention.
Fig. 2 is a schematic structural diagram of the battery core winding device shown in fig. 1 after hiding the secondary prepressing mechanism and the hot press forming mechanism.
Fig. 3 is a schematic plan view of a circular winding needle mechanism in the cell winding device of the present invention after winding out a circular cell.
Fig. 4 to 6 are flowcharts of the circular winding needle auxiliary discharging device in the cell winding apparatus of the present invention for assisting the circular winding needle mechanism in discharging the circular cell.
Fig. 7 to 8 are flowcharts of prepressing a circular battery cell into an elliptical battery cell by using an auxiliary discharging device for a circular winding pin in the battery cell winding device of the present invention.
Fig. 9 is a schematic diagram showing a state of the secondary pre-pressing mechanism in the cell winding device of the present invention after the elliptical cell is pre-pressed for the second time.
Fig. 10 is a schematic diagram of a state in which a hot press forming mechanism in the cell winding device of the present invention performs hot press forming on an oval cell after secondary pre-pressing to form a flat cell.
Fig. 11 to 12 are schematic structural views of another embodiment of the lower positioning structure in the auxiliary discharging device for a circular winding needle of the present invention.
Fig. 13 to 14 are schematic structural views of still another embodiment of the lower positioning structure in the auxiliary discharging device for a circular winding needle of the present invention.
Fig. 15 to 16 are schematic structural views of another embodiment of an upper pre-pressing plate in the auxiliary discharging device for a circular winding needle of the present invention.
Fig. 17 is a flow chart of the cell molding method of the present invention.
Detailed Description
In order to describe the technical content and constructional features of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, the battery cell winding apparatus 100 of the present invention includes an auxiliary discharging device 10 for a circular winding pin, a circular winding pin mechanism 20, a secondary pre-pressing mechanism 30 and a hot press forming mechanism 40. The circular winding needle mechanism 20 is used for winding the diaphragm and the pole piece out of the circular battery core 50 so as to overcome the problem that the elliptical winding needle fluctuates during winding, so that the circular battery core 50 can be wound stably at high speed, and the linear speed can reach more than 1m/s during winding, thereby improving the productivity; specifically, referring to fig. 3, in the present embodiment, the circular winding needle mechanism 20 includes a circular outer winding needle 21a, an inner winding needle 21b and a winding needle driving assembly 22, the inner winding needle 21b is accommodated in the circular outer winding needle 21a and forms a circular winding needle 21, the winding needle driving assembly 22 drives the circular winding needle 21 to rotate to wind the diaphragm and the pole piece out of the circular battery cell 50, and the winding needle driving assembly 22 also drives the circular winding needle 21 to move along the axial direction of the circular winding needle 21 so as to separate the circular battery cell 50 from the circular winding needle 21.
As shown in fig. 1 and 9, the secondary pre-pressing mechanism 30 performs secondary pre-pressing on the elliptical cell 60 pre-formed by the circular cell 50; specifically, in the present embodiment, the secondary pre-pressing mechanism 30 includes a secondary pre-pressing upper plate 31, a secondary pre-pressing plate 32, and a secondary pre-pressing driving assembly (not shown) for driving the secondary pre-pressing upper plate 31 and the secondary pre-pressing lower plate 32 to perform an opening-closing fit, so that when the secondary pre-pressing driving assembly drives the secondary pre-pressing upper plate 31 and the secondary pre-pressing lower plate 32 to perform a closing movement in opposite directions, the elliptical cell 60 disposed between the secondary pre-pressing upper plate 31 and the secondary pre-pressing plate 32 is pre-pressed secondarily, and the elliptical cell 60 is further flattened.
As shown in fig. 1 and 10, the hot press forming mechanism 40 hot presses the oval battery cell 60 after the secondary pre-pressing to form a shaped flat battery cell 70; specifically, in the present embodiment, the hot-press forming mechanism 40 includes an upper hot-press plate 41, a lower hot-press plate 42, heating elements 43 respectively assembled at the upper hot-press plate 41 and the lower hot-press plate 42, and a hot-press driving assembly (not shown) for driving the upper hot-press plate 41 and the lower hot-press plate 42 to perform a tension fit, so that when the hot-press driving assembly drives the upper hot-press plate 41 and the lower hot-press plate 42 to perform a closing motion in opposite directions, the oval battery cell 60 after the secondary pre-pressing is hot-pressed to form a desired flat battery cell 70, thereby simplifying the structure of the hot-press forming mechanism 40; for example, in the present embodiment, the heating element 43 is a heating rod, so as to facilitate the arrangement and placement of the heating rod in the upper platen 41 and the lower platen 42, but not limited thereto.
As shown in fig. 1 to 2 and fig. 4 to 8, the auxiliary discharging device 10 for a circular winding needle comprises a lower positioning structure 11 for positioning the lower side of the outer side of the circular cell 50, a needle drawing stop 12 for stopping the rearward movement of the circular cell 50 along the axial direction of the circular cell 50, a spreading mechanism 13 for positioning with the inner side of the circular cell 50, an upper pre-pressing plate 14 for pressing against the upper side of the outer side of the circular cell 50, and a pre-pressing driving mechanism (not shown) for relatively opening and closing both the upper pre-pressing plate 14 and the lower positioning structure 11. When the circular battery cell 50 on the circular winding needle mechanism 20 is placed on the lower positioning structure 11 and is blocked by the needle drawing stop block 12, and the stretching mechanism 13 is stretched on the inner side of the circular battery cell 50 and positioned with the inner side, the state can be seen in fig. 2 and 5, and then the circular winding needle mechanism 20 moves backwards along the axial direction of the circular battery cell 50 and is separated from the circular battery cell 50, and the state is seen in fig. 6; as shown in fig. 7 and 8, the separated circular cells 50 are preloaded into elliptical cells 60 by the cooperation of the spreader mechanism 13, the lower positioning structure 11, the upper preload plate 14 and the preload drive mechanism. Specifically, as shown in fig. 7 and 8, in the present embodiment, in the process of pre-pressing the circular battery cells 50 into the oval battery cells 60, the opening mechanism 13 opens the inner sides of the circular battery cells 50 outwards along the left-right direction of the circular battery cells 50, so as to effectively ensure that the circular battery cells 50 are pre-pressed into the oval battery cells 60, but not limited thereto. For example, as shown in fig. 4 to 8, in the present embodiment, the lower positioning structure 11 includes a left positioning plate 111 and a right positioning plate 112 that are pivotally engaged with each other, and the left positioning plate 111 and the right positioning plate 112 are switched between a first position shown in fig. 7 and a second position shown in fig. 8; in the process that the circular battery cell 50 is pre-pressed into the elliptical battery cell 60, the left positioning plate 111 and the right positioning plate 112 are switched from the first position to the second position; in the first position, the left positioning plate 111 and the right positioning plate 112 enclose a V-shaped positioning groove 113 for positioning the circular battery cell 50 on the circular winding needle mechanism 20, so that the circular battery cell 50 can have a good positioning effect in the rolling direction, and the positioning state of the V-shaped positioning groove 113 for the circular battery cell 50 is shown in fig. 4; in the second position, the left positioning plate 111 and the right positioning plate 112 are mutually flattened to form a flat plate structure, so as to ensure that the upper pre-pressing plate 14 and the lower positioning structure 11 can more reliably pre-press the circular cell 50 into the elliptical cell 60, but not limited thereto.
Referring to fig. 11 and 12, another embodiment of the lower positioning structure is shown. In fig. 11 and 12, the lower positioning structure 11' further includes a middle positioning plate 114 disposed between the left positioning plate 111 and the right positioning plate 112, wherein the left side of the middle positioning plate 114 is hinged to the left positioning plate 111, and the right side of the middle positioning plate 114 is hinged to the right positioning plate 112; therefore, in the first position, the left positioning plate 111 is inclined to the upper left with respect to the middle positioning plate 114, and the right positioning plate 112 is inclined to the upper right with respect to the middle positioning plate 114; in the second position, the left positioning plate 111 and the right positioning plate 112 are respectively flattened relative to the middle positioning plate 114, so that the left positioning plate 111, the middle positioning plate 114 and the right positioning plate 113 form a flat plate structure; in the lower positioning structure 11 shown in fig. 4 to 8, the lower positioning structure 11 includes a left positioning plate 111 and a right positioning plate 112 that are pivotally engaged with each other, and the left positioning plate 111 and the right positioning plate 112 are switched between a first position shown in fig. 7 and a second position shown in fig. 8; in the process that the circular battery cell 50 is pre-pressed into the elliptical battery cell 60, the left positioning plate 111 and the right positioning plate 112 are switched from the first position to the second position; in the first position, the left positioning plate 111 and the right positioning plate 112 enclose a V-shaped positioning slot 113 for positioning the circular battery cell 50 on the circular winding needle mechanism 20; in the second position, the left positioning plate 111 and the right positioning plate 112 are flattened to form a flat plate structure. Meanwhile, in fig. 11 and 12, the circular winding needle mechanism 20 is moved backward in the axial direction to draw the needle after the circular cell 50 is positioned by the upper pre-pressing plate 14 and the lower positioning structure 11'; in the lower positioning structure shown in fig. 4 to 8, the circular winding needle mechanism 20 is moved backward in the axial direction to draw the needle after the opening mechanism 13 and the lower positioning structure 11 position the circular cell 50.
Referring to fig. 13 and 14, yet another embodiment of the lower positioning structure is shown. In fig. 13 and 14, the lower positioning structure 11″ includes a movable plate 115, a left positioning block 116 and a right positioning block 117, the left positioning block 116 has a left inclined surface 1161 in interference fit with the left side of the outer side of the circular cell 50, the right positioning block 117 has a right inclined surface 1171 in interference fit with the right side of the outer side of the circular cell 50, and the movable plate 115 is in interference fit with the lower side of the outer side of the circular cell 50 and moves in the up-down direction relative to the left positioning block 116 and the right positioning block 117; therefore, in the first position, the left inclined surface 1161 and the right inclined surface 117 extend out of the movable plate 115, so that the outer side of the circular cell 50 is positioned between the left inclined surface 1161, the right inclined surface 1171 and the movable plate 115, and the state is shown in fig. 13; in the second position, the moving plate 115 moves upward to separate the left inclined plane 1161 and the right inclined plane 1171 from abutting against the oval cell 60 pre-pressed by the round cell 50, so as to effectively ensure that the round cell 50 is pre-pressed out of the oval cell 60. Meanwhile, as shown in fig. 13 and 14, the circular winding needle mechanism 20 is moved backward in the axial direction to withdraw the needle after the circular cell 50 is positioned by the upper pre-pressing plate 14 and the lower positioning structure 11″.
Referring to fig. 15 and 16, another embodiment of the upper platen is shown. In fig. 15 and 16, the upper pre-pressing plate 14' includes a left pressing plate 141, a middle pressing plate 143, and a right pressing plate 142, the left side of the middle pressing plate 143 is hinged with the left pressing plate 141, the right side of the middle pressing plate 143 is hinged with the right pressing plate 142, the left pressing plate 141 is inclined leftward and downward with respect to the middle pressing plate 143, and the right pressing plate 142 is inclined rightward and downward with respect to the middle pressing plate 142; therefore, in the process of pre-pressing the circular cell 50 into the elliptical cell 60, the left pressing plate 141 and the right pressing plate 142 are respectively flattened relative to the middle pressing plate 143, so that the left pressing plate 141, the middle pressing plate 143 and the right pressing plate 142 form a flat plate structure, and the circular cell 50 is reliably positioned between the upper pre-pressing plate 14 'and the lower positioning structure 11', and the state is shown in fig. 15. As further shown in fig. 15 and 16, the circular winding needle mechanism 20 is moved axially rearward to withdraw the needle after the circular cell 50 is positioned by the upper pre-pressing plate 14 'and the lower positioning structure 11'. While the upper pre-press plate 14 shown in fig. 4 to 14 is a flat plate structure. It will be appreciated that since there are three embodiments of the lower positioning structure and two embodiments of the upper pre-press plate, there are 6 combinations thereof, and fig. 7, 11, 13 and 15 show only four combinations of the lower positioning structure and the upper pre-press plate, but not limited thereto.
Referring to fig. 17, the method for forming a battery cell of the present invention includes the steps of: s001, winding the diaphragm and the pole piece into a circular cell 50 by the circular winding needle mechanism 20; s002, the auxiliary discharging device 10 for the round winding needle assists the round winding needle mechanism 20 to discharge the round battery cell 50 on the round winding needle mechanism 20, and the auxiliary discharging device 10 for the round winding needle also pre-presses the discharged round battery cell 50 into an elliptical battery cell 60, wherein in the process that the discharged round battery cell 50 is pre-pressed into the elliptical battery cell 60, the pre-pressing driving mechanism drives the upper pre-pressing plate 14 and the lower positioning structures 11, 11', 11″ to pre-press the round battery cell 50 along the opposite direction, and simultaneously, the expanding mechanism 13 also expands the inner side of the round battery cell 50 outwards along the left-right direction of the round battery cell 50; s003, the elliptical battery cell 60 is transmitted to the secondary prepressing mechanism 30, and the secondary prepressing mechanism 30 performs secondary prepressing on the elliptical battery cell 60; s004, the oval battery cell 60 after secondary prepressing is transmitted to the hot press forming mechanism 40, and the oval battery cell 60 after secondary prepressing is hot pressed into a required flat battery cell 70 by the hot press forming mechanism 40.
Compared with the prior art, the auxiliary discharging device 10 for the circular winding needle comprises the lower positioning structures 11, 11 'and 11″ for positioning the lower side of the circular electric core 50, the needle drawing stop block 12 for stopping the circular electric core 50 from moving backwards along the axial direction of the circular electric core 50, the expanding mechanism 13 for positioning the inner side of the circular electric core 50, the upper pre-pressing plates 14 and 14' for pressing the upper side of the outer side of the circular electric core 50 and the pre-pressing driving mechanism for relatively opening and closing the upper pre-pressing plates 14 and 14 'and the lower positioning structures 11, 11', so that when the circular electric core 50 on the circular winding needle mechanism 20 is placed on the lower positioning structures 11, 11 'and clamped by the needle drawing stop block 12, and the expanding mechanism 13 is placed on the inner side of the circular electric core 50 and is positioned with the inner side or the upper pre-pressing plates 14 and 14' pressed on the upper side of the circular electric core 50 at the moment, the circular winding needle mechanism 20 moves backwards along the axial direction of the circular electric core 50, and the circular electric core 50 is separated from the circular electric core 50, and the discharging device further has the advantage of compact winding needle winding mechanism. Meanwhile, the separated round electric core 50 is preloaded into an elliptical electric core 60 when the preloading driving mechanism drives the upper preloading plates 14 and 14 'and the lower positioning structures 11, 11' and 11″ to move oppositely, and in the process that the round electric core 50 is preloaded into the elliptical electric core 60, the expanding mechanism 13 expands the inner side of the round electric core 50 outwards along the left-right direction of the round electric core 50, so that the problem of wrinkling and edge collapsing of the inner rolling diaphragm of the elliptical rolling needle is solved, and the quality of the electric core is ensured.
The foregoing disclosure is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the claims herein, as equivalent variations on the claims herein will fall within the scope of the invention.
Claims (10)
1. The auxiliary discharging device for the circular winding needle is used for discharging a circular electric core wound by a circular winding needle mechanism and prepressing the circular electric core into an elliptical electric core and is characterized by comprising a lower positioning structure, a needle drawing stop block, a spreading mechanism, an upper prepressing plate and a prepressing driving mechanism, wherein the lower positioning structure is used for positioning the lower part of the outer side of the circular electric core, the needle drawing stop block is used for stopping the circular electric core from moving backwards along the axial direction of the circular electric core, the spreading mechanism is used for positioning the inner side of the circular electric core, the upper prepressing plate is used for pressing the upper part of the outer side of the circular electric core, and the prepressing driving mechanism is used for relatively opening and closing the upper prepressing plate and the lower positioning structure; when the round electric core on the round needle winding mechanism is arranged on the lower positioning structure and is clamped by the needle drawing stop block, and the opening mechanism is arranged on the inner side of the round electric core in an extending mode and is positioned with the inner side or the upper pre-pressing plate is pressed above the outer side of the round electric core in an abutting mode, the round needle winding mechanism moves backwards along the axial direction of the round electric core to be separated from the round electric core, and the separated round electric core is pre-pressed into the elliptical electric core under the cooperation of the opening mechanism, the lower positioning structure, the upper pre-pressing plate and the pre-pressing driving mechanism.
2. The auxiliary discharging device for the circular winding needle according to claim 1, wherein the opening mechanism opens the inner side of the circular battery cell outwards along the left-right direction of the circular battery cell in the process that the circular battery cell is pre-pressed into the elliptical battery cell.
3. The auxiliary discharging device for the circular winding needle according to claim 2, wherein the lower positioning structure comprises a left positioning plate and a right positioning plate which are mutually unfolded, folded and pivoted and matched, and the left positioning plate and the right positioning plate are switched between a first position and a second position; when the first position is reached, the left positioning plate and the right positioning plate enclose a V-shaped positioning groove for positioning the circular battery cell on the circular winding needle mechanism; when the left positioning plate and the right positioning plate are in the second position, the left positioning plate and the right positioning plate are mutually flattened to form a flat plate structure; and in the process that the round battery cell is pre-pressed into the elliptical battery cell, the left positioning plate and the right positioning plate are switched from the first position to the second position.
4. The auxiliary discharging device for the circular winding needle according to claim 3, wherein the lower positioning structure further comprises a middle positioning plate positioned between the left positioning plate and the right positioning plate, the left side of the middle positioning plate is hinged with the left positioning plate, and the right side of the middle positioning plate is hinged with the right positioning plate; when the left positioning plate is at the first position, the left positioning plate is inclined to the left and the upper sides relative to the middle positioning plate, and the right positioning plate is inclined to the right and the upper sides relative to the middle positioning plate; when the left positioning plate and the right positioning plate are in the second position, the left positioning plate and the right positioning plate are respectively flattened relative to the middle positioning plate, so that the left positioning plate, the middle positioning plate and the right positioning plate form a flat plate structure.
5. The auxiliary discharging device for the circular winding needle according to claim 1, wherein the lower positioning structure comprises a movable flat plate, a left positioning block and a right positioning block, the left positioning block is provided with a left inclined surface in interference fit with the left side of the outer side of the circular electric core, the right positioning block is provided with a right inclined surface in interference fit with the right side of the outer side of the circular electric core, and the movable flat plate is in interference fit with the lower side of the outer side of the circular electric core and moves relative to the left positioning block and the right positioning block along the up-down direction; when the battery cell is at the first position, the left inclined plane and the right inclined plane extend out of the movable flat plate so that the outer side of the round battery cell is positioned among the left inclined plane, the right inclined plane and the movable flat plate; and when the movable plate is at the second position, the movable plate moves upwards to enable the left inclined plane and the right inclined plane to be separated from and butted with the elliptical battery cell pre-pressed by the circular battery cell.
6. The auxiliary discharging device for the circular winding needle according to claim 1, wherein the upper pre-pressing plate comprises a left pressing plate, a middle pressing plate and a right pressing plate, the left side of the middle pressing plate is hinged with the left pressing plate, the right side of the middle pressing plate is hinged with the right pressing plate, the left pressing plate is inclined leftwards and downwards relative to the middle pressing plate, and the right pressing plate is inclined rightwards and downwards relative to the middle pressing plate; in the process that the circular battery cell is pre-pressed into the elliptical battery cell, the left pressing plate and the right pressing plate are respectively flattened relative to the middle pressing plate, so that the left pressing plate, the middle pressing plate and the right pressing plate form a flat plate structure.
7. The utility model provides a battery cell winding equipment, includes circular needle mechanism, secondary pre-compaction mechanism and hot briquetting mechanism, circular needle mechanism is used for rolling up diaphragm and pole piece out circular battery cell, its characterized in that, battery cell winding equipment still includes according to the circular supplementary discharge apparatus for the needle of rolling up of any one of claims 1 to 6, secondary pre-compaction mechanism is right oval battery cell carries out the secondary pre-compaction, hot briquetting mechanism hot briquetting the oval battery cell after the secondary pre-compaction out the flat battery cell of design.
8. The cell winding apparatus of claim 7, wherein the circular winding mechanism comprises a circular outer winding needle, an inner winding needle and a winding needle driving assembly, the inner winding needle is accommodated in the circular outer winding needle and forms a circular winding needle, and the winding needle driving assembly drives the circular winding needle to rotate and move along the axial direction of the circular winding needle.
9. The cell winding apparatus according to claim 7, wherein the secondary pre-pressing mechanism comprises a secondary pre-pressing plate, and a secondary pre-pressing driving assembly for driving the secondary pre-pressing plate and the secondary pre-pressing plate to be in open-close fit; the hot-press forming mechanism comprises an upper hot-press plate, a lower hot-press plate, heating elements respectively assembled at the upper hot-press plate and the lower hot-press plate, and a hot-press driving assembly for driving the upper hot-press plate and the lower hot-press plate to be in open-close fit.
10. A cell molding method using the cell winding apparatus of claim 7, comprising the steps of:
(1) The circular winding needle mechanism winds the diaphragm and the pole piece into a circular battery cell;
(2) The circular winding needle is used for assisting the circular winding needle mechanism to detach the circular battery core on the circular winding needle mechanism, and the detached circular battery core is pre-pressed into an elliptical battery core by the circular winding needle auxiliary discharging device, wherein in the process that the detached circular battery core is pre-pressed into the elliptical battery core, the pre-pressing driving mechanism drives the upper pre-pressing plate and the lower positioning structure to pre-press the circular battery core along the opposite direction, and the expanding mechanism also expands the inner side of the circular battery core outwards along the left-right direction of the circular battery core;
(3) The elliptic battery core is transmitted to a secondary prepressing mechanism, and the secondary prepressing mechanism performs secondary prepressing on the elliptic battery core; and
(4) And the oval battery core after secondary prepressing is transmitted to a hot-press forming mechanism, and the oval battery core after secondary prepressing is hot-pressed into a required flat battery core by the hot-press forming mechanism.
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