CN115799592B - Battery cell blanking equipment and method - Google Patents
Battery cell blanking equipment and method Download PDFInfo
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- CN115799592B CN115799592B CN202211251449.6A CN202211251449A CN115799592B CN 115799592 B CN115799592 B CN 115799592B CN 202211251449 A CN202211251449 A CN 202211251449A CN 115799592 B CN115799592 B CN 115799592B
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Classifications
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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
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application relates to a battery cell blanking device. The battery core blanking equipment is used for blanking a battery core wound by a winding needle and comprises a spreading assembly, wherein the spreading assembly is used for spreading the battery core from an initial form to a final form, the spreading assembly comprises a spreading driving piece and two clamping jaws, the two clamping jaws are oppositely arranged along the spreading direction of the battery core, the spreading driving piece is configured to provide spreading driving force for the two clamping jaws, and the spreading assembly is provided with a controller; each clamping jaw comprises an inner clamping needle and an outer clamping needle which are respectively clamped on the inner ring and the outer ring of the battery cell; defining that the inner clamping needle is positioned at an initial position when the battery cell is positioned at an initial state; when the battery cell is in the final supporting state, the inner clamping needle is positioned at the final supporting position; when the inner clamping needle moves to the final supporting position, the controller controls the two clamping jaws to stop the supporting movement, and the battery cell is in the final supporting form. The final position of the inner clamping needle is set, the position of the inner clamping needle is more accurate, and the situation that the pole piece of the battery cell is cracked by external force due to overlarge supporting distance of the inner clamping needle is avoided.
Description
Technical Field
The application relates to the technical field of battery manufacturing, in particular to a battery core blanking device and a battery core blanking method.
Background
Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, power battery technology is an important factor in the development of the electric vehicles.
At present, in the production and manufacturing process of the battery, positive and negative pole pieces and a separation film are wound by a winding machine to form a battery core, and after the battery core is wound on a winding needle, a clamping mechanism is used for blanking. The prior blanking clamping mechanism generally comprises two clamping jaws, each clamping jaw comprises an inner clamping needle and an outer clamping needle, after the electric core is clamped by the inner clamping needle and the outer clamping needle, the electric core is supported by the two clamping jaws for a distance, the electric core is deformed into an oval shape with a final supporting shape by a circle with an initial shape, then the electric core is pre-pressed and shaped, the electric core after pre-pressing and shaping is in a flat structure, and the winding needle is drawn back to realize blanking.
In the blanking process of the battery cell, the distance that the clamping jaw stretches the battery cell is generally judged by virtue of experience of workers, the stretching distance is not accurate enough, the pole piece is easily cracked by external force, and the blanking quality of the battery cell is affected.
Disclosure of Invention
In view of the above problems, the application provides a battery cell blanking device and method, which can relieve the problem that a pole piece is easy to crack due to external force in the blanking process of the battery cell.
In a first aspect, the present application provides a battery cell blanking apparatus, configured to blanking a battery cell wound by a winding pin, including:
the cell expanding device comprises an initial form, an expanding assembly and a supporting assembly, wherein the expanding assembly is used for expanding a cell from the initial form to a final form, the expanding assembly comprises an expanding driving piece and two clamping jaws, the two clamping jaws are oppositely arranged along the expanding direction of the cell, the expanding driving piece is configured to provide expanding driving force for the two clamping jaws, the expanding assembly is provided with a controller, and the controller is connected with the expanding driving piece;
each clamping jaw comprises an inner clamping needle and an outer clamping needle which are respectively clamped on the inner ring and the outer ring of the battery cell; defining that the inner clamping needle is positioned at an initial position when the electric core is positioned at the initial state; when the battery cell is in the final supporting form, the inner clamping needle is positioned at the final supporting position;
when the inner clamping needle moves to the final supporting position, the controller controls the two clamping jaws to stop the opening movement, and the battery cell is in the final supporting form.
According to the technical scheme, the two clamping jaws can clamp the battery core, the expanding driving piece can drive the clamping jaws to be far away from each other to expand the battery core, when the inner clamping needle moves to the expanding final position in the process of expanding the battery core, the controller stops expanding movement of the clamping jaws, and the battery core is in the expanding final state.
In some embodiments, the distance between the initial position and the final position is D, the circumference of the tuck needle is a, the diameter of the inner clip needle is B, the circumference of the inner clip needle is C, the c=pi B, the D satisfies: d=a/2-C/2-B. Through defining and designing the distance D that the inner clamping needle moves when the battery cell is propped up, the situation that the pole piece of the battery cell is cracked by external force caused by overlarge propping up distance is avoided, especially the cracking situation at the corner of the battery cell is improved, meanwhile, too small propping up distance is avoided, the gap between the pole pieces of the inner ring of the battery cell caused by too large propping up distance is avoided, and the quality of the battery cell after being propped up is improved. When producing the electric core of different size models to and/or adopt the needle of rolling up of different size models, when interior needle that presss from both sides, can be according to the electric core of specific production, the needle of rolling up of specific use and interior needle that presss from both sides, define and calculate accurate initial position and prop the distance between the final position and be D, make electric core unloading equipment prop open the distance more accurate, further reduce prop open the too big circumstances that causes the pole piece of electric core to receive external force fracture and produce, promote the unloading quality of electric core, simultaneously, can produce the electric core of different size models, also can use the production facility of different size models, make electric core unloading equipment have higher suitability.
In some embodiments, a deceleration position is provided between the initial position and the final position, the distance between the deceleration position and the initial position being H, the H satisfying: h=d-1 mm, and the movement speed of the inner clip is reduced after the inner clip is driven to move to the speed reducing position by the opening driving member. Therefore, in the process that the inner clamping needle moves from the initial position to the speed-down position, the battery cell is gradually spread, the battery cell deforms from the circular shape to the oval shape in the initial shape, and after the battery cell reaches the speed-down position, most of the deformation of the battery cell is finished at the moment, the moving speed of the inner clamping needle is reduced, the situation that the moving speed of the inner clamping needle is too high in the subsequent moving process is avoided, and the pole piece of the battery cell is spread.
In some embodiments, the inner clip needle is provided with a torque sensor, the torque sensor collects a torque signal between the inner clip needle and the inner ring pole piece of the battery cell to be E, the opening driving piece is connected with the controller, the torque sensor is connected with the controller in a signal transmission manner, the controller is provided with a preset torque F, and the F satisfies the following conditions: and E is more than or equal to F, the controller controls the opening driving piece to drive the clamping jaw to stop moving. The torque sensor collects the torque of the inner clamping needle, when the torque signal E is larger than the preset torque F, the opening driving piece is stopped, the movement of the inner clamping needle is stopped, and the inner clamping needle is prevented from opening the pole piece of the battery cell.
In some embodiments, after the inner needle is moved to the reduced speed position, the torque sensor begins to transmit the torque signal E to the controller. After the inner needle reaches the speed-down position, the torque sensor starts to transmit the torque signal E, so that the torque sensor does not need to be started all the time.
In some embodiments, the cell blanking apparatus further includes a pre-pressing device, where the pre-pressing device is configured to pre-press the cells in the final state. The prepressing device prepresses in the battery cell winding and discharging process, can facilitate the use of the next production and manufacturing process, does not need to independently set up prepressing equipment, reduces the feeding and discharging work of one-time prepressing, and improves the production efficiency.
In some embodiments, the pre-pressing means comprises:
the lower pre-pressing plate is used for placing the battery cell;
the upper pre-pressing plate is connected with a pre-pressing driving piece, and the pre-pressing driving piece is configured to drive the lower pre-pressing plate to be close to the lower pre-pressing plate along the direction perpendicular to the opening direction. The lower pre-pressing plate is used for bearing the battery cell, and the upper pre-pressing plate is driven by the pre-pressing driving piece to gradually approach the lower pre-pressing plate, so that the battery cell is pre-pressed in the approaching process.
In some embodiments, at least a portion of the surface of the lower pre-press plate facing the cell is configured as planar; the surface of the upper pre-pressing plate facing the battery cell is at least partially configured to be planar. So for lower pre-compaction board has better pre-compaction effect to the electric core, makes the pre-compaction board have better pre-compaction effect to the electric core, promotes the pre-compaction effect of pre-compaction device and the pre-compaction quality after the electric core is pre-compaction.
In some embodiments, a follower drive is connected to the spreader assembly and is configured to drive the spreader assembly to approach the lower pre-press plate in a direction perpendicular to the spreading direction. So, at the in-process of pre-compaction, strut the subassembly and can follow the pushing down motion of lower pre-pressing board and move together, at the stage that the pre-compaction subassembly just begins to the pre-compaction of electric core, strut the subassembly and have certain locate action to the electric core, improve the pre-compaction quality of electric core.
In some embodiments, a needle extraction driver is connected to the spreader assembly and is configured to drive the spreader assembly to be extracted from the cell along the cell axis. In the pre-pressing process, the upper pre-pressing plate and the lower pre-pressing plate also have clamping effect on the battery cell, and after the battery cell is clamped by the upper pre-pressing plate and the lower pre-pressing plate, the inner clamping needle is conveniently pulled out of the battery cell, and the needle pulling work of the inner clamping needle is completed.
In a second aspect, the application provides a method for blanking a battery cell, which comprises the following steps:
s1, clamping an inner ring and an outer ring of a battery cell by at least two clamping jaws in an expanding assembly;
s2, needle retracting of the winding needle;
s3, setting the final supporting position of the inner clip needle;
s4, the two clamping jaws prop open the electric core, and when the inner clamping needle moves to the propping final position, the two clamping jaws are controlled to stop the prop-open movement. The two clamping jaws can clamp the battery core, the expanding driving piece can drive the clamping jaws to be far away from each other to expand the battery core, in the process of expanding the battery core, when the inner clamping needle moves to the expanding final position, the controller stops expanding the clamping jaws, and the battery core is in an expanding final state.
In some embodiments, the step S3 specifically includes:
s31, defining that the inner clamping needle is positioned at an initial position when the battery cell is in the initial state; when the battery cell is in the final supporting form, the inner clamping needle is positioned at the final supporting position;
s32, the distance between the initial position and the final supporting position is D, the circumference of the winding needle is A, the diameter of the inner clamping needle is B, the circumference of the inner clamping needle is C, C=pi B, and D satisfies the following conditions: d=a/2-C/2-B. Through defining and designing the distance D that the inner clamping needle moves when the battery cell is propped up, the situation that the pole piece of the battery cell is cracked by external force caused by overlarge propping up distance is avoided, especially the cracking situation at the corner of the battery cell is improved, meanwhile, too small propping up distance is avoided, the gap between the pole pieces of the inner ring of the battery cell caused by too large propping up distance is avoided, and the quality of the battery cell after being propped up is improved. When producing the battery core of different size models to and/or adopt the needle of rolling up of different size models, when interior needle that presss from both sides, can be according to the battery core of specific production, the needle of rolling up of specific use and interior needle that presss from both sides, define and calculate the distance between accurate initial position and the final position and be D, make the distance of propping up more accurate, further reduction prop up the too big condition that causes the pole piece of battery core to receive the external force fracture of distance and produce, promote the unloading quality of battery core, simultaneously, can produce the battery core of different size models, also can use the production facility of different size models.
In some embodiments, the step S4 specifically includes:
s41, the inner clamping needle is provided with a moment sensor, and the moment sensor acquires a moment signal E between the inner clamping needle and the inner ring pole piece of the battery cell;
s42, setting a preset moment F of the inner clip needle;
s43, the F meets the following conditions: and when E is more than or equal to F, controlling the two clamping jaws to stop the opening movement. The torque sensor collects the torque of the inner clamping needle, when the torque signal E is larger than the preset torque F, the opening driving piece is stopped, the movement of the inner clamping needle is stopped, and the inner clamping needle is prevented from opening the pole piece of the battery cell.
In some embodiments, the method further comprises step S5, where S5 specifically includes pre-pressing the battery cell. The battery cell blanking in-process is prepressed, can be convenient for the use of next manufacturing process, need not set up the pre-compaction equipment alone, reduces the material loading and the unloading work of a pre-compaction, promotes production efficiency.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:
FIG. 1 is a schematic diagram of an exploded structure of a battery according to some embodiments of the present application;
fig. 2 is a schematic exploded view of a battery cell according to some embodiments of the present application;
fig. 3 is a schematic structural diagram of a battery cell blanking apparatus according to some embodiments of the present application;
fig. 4 is a schematic structural diagram of an inner clip needle in a battery cell blanking apparatus according to some embodiments of the present application when the inner clip needle is located at an initial position;
fig. 5 is a schematic structural view of an inner clip needle in a cell blanking apparatus in accordance with some embodiments of the present application in a final supporting position;
fig. 6 is a schematic structural diagram of a prepressing device in a battery cell blanking apparatus according to some embodiments of the present application;
fig. 7 is a schematic diagram of H embodied in a cell blanking apparatus according to some embodiments of the present application;
fig. 8 is a schematic structural diagram of a prepressing device in a die-cutting apparatus according to some embodiments of the present application.
Reference numerals in the specific embodiments are as follows:
100. a battery; 10. a case; 11. a first portion; 12. a second portion; 20. a battery cell; 21. an end cap; 21a, electrode terminals; 22. a housing; 23. a battery cell; 23a, pole lugs;
200. the battery cell blanking equipment; 210. a spreader assembly; 211. a clamping jaw; 2111. an inner clip needle; 2112. an outer clip needle; 220. a torque sensor; 230. a pre-pressing device; 231. a lower pre-pressing plate; 232. an upper pre-pressing plate;
300. a winding needle; 310. and (5) winding grooves.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.
The inventor notes that in the production and manufacturing process of the battery, the positive and negative electrode plates and the isolating film are mainly wound by a winding machine to form an electric core, and after the electric core is wound on the winding needle, the electric core is usually fed by a clamping mechanism. The prior blanking clamping mechanism generally comprises two clamping jaws, each clamping jaw comprises an inner clamping needle and an outer clamping needle, after the electric core is clamped by the inner clamping needle and the outer clamping needle, the electric core is supported by the two clamping jaws for a distance, the electric core is deformed into an oval shape with a final supporting shape by a circle with an initial shape, then the electric core is pre-pressed and shaped, the electric core after pre-pressing and shaping is in a flat structure, and the winding needle is drawn back to realize blanking. In the blanking process of the battery cell, the final position of the inner clamping needle is judged by virtue of experience of workers when the clamping jaw stretches the battery cell, the final position of the inner clamping needle is set, and the position of the inner clamping needle is controlled by the controller, so that the battery cell blanking device is more accurate.
Based on the above consideration, through intensive research, a battery core blanking device is designed, and when the battery core is in an initial form, the inner clamping needle is positioned at an initial position; when the battery cell is in the final supporting form, the inner clamping needle is located at the final supporting position, and when the inner clamping needle moves to the final supporting position, the controller controls the two clamping jaws to stop the opening movement, and the battery cell is in the final supporting form.
In such electric core unloading equipment, through defining and design the end position that props of interior clip needle, compare in relying on artifical experience to judge, avoid propping up the too big pole piece that causes the electric core and receive the circumstances of external force fracture and produce, simultaneously, also avoid propping up the too little problem of clearance between the electric core inner circle pole piece that causes, improve the production quality of electric core.
The battery core blanking equipment disclosed by the embodiment of the application can be applied to the manufacturing process of the battery, the manufactured battery core is manufactured to manufacture the battery, the manufactured battery can be used in power utilization devices such as vehicles, ships or aircrafts, and the like, and the battery manufactured by the battery core blanking equipment disclosed by the application can be used for forming a power supply system of the power utilization device. Thus, the problem that the pole piece of the battery core is cracked by external force is solved, the production quality of the battery core is improved, and the stability of the battery performance and the service life of the battery are improved.
The power utilization device provided by the embodiment of the application can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like. In some embodiments of the present application, the battery may be used not only as an operating power source of the power consumption device, but also as a driving power source of the power consumption device to provide driving power for the power consumption device.
The following examples are given by way of example of a battery according to embodiments of the present application for convenience of explanation.
Referring to fig. 1, fig. 1 is an exploded view of a battery 100 according to some embodiments of the present application; the battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide an accommodating space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 being overlapped with each other, the first portion 11 and the second portion 12 together defining an accommodating space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end opened, the first portion 11 may be a plate-shaped structure, and the first portion 11 covers the opening side of the second portion 12, so that the first portion 11 and the second portion 12 together define a containing space; the first portion 11 and the second portion 12 may be hollow structures each having an opening at one side, and the opening side of the first portion 11 is engaged with the opening side of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.
In the battery 100, the plurality of battery cells 20 may be connected in series, parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.
Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.
Referring to fig. 2, fig. 2 is an exploded view of a battery cell 20 according to some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 20 includes an end cap 21, a housing 22, a cell 23, and other functional components.
The end cap 21 refers to a member that is covered at the opening of the case 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 may be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cover 21 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the end cover 21 is not easy to deform when being extruded and collided, so that the battery cell 20 can have higher structural strength, and the safety performance can be improved. The end cap 21 may be provided with a functional member such as an electrode terminal 21 a. The electrode terminal 21a may be used to be electrically connected with the electric cell 23 for outputting or inputting electric energy of the battery cell 20. In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end cap 21, which may be used to isolate electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.
The housing 22 is an assembly for mating with the end cap 21 to form the internal environment of the battery cell 20, where the internal environment may be formed to house the cell 23, electrolyte, and other components. The case 22 and the end cap 21 may be separate members, and an opening may be provided in the case 22, and the interior of the battery cell 20 may be formed by covering the opening with the end cap 21 at the opening. It is also possible to integrate the end cap 21 and the housing 22, but specifically, the end cap 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then put into place with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 may be determined according to the specific shape and size of the battery cell 23. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.
The cell 23 is a member in which electrochemical reactions occur in the battery cell 100. One or more electrical cells 23 may be contained within the housing 22. In the conventional art, the battery cell 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The battery cell is mainly formed by winding a positive plate and a negative plate, and a diaphragm is usually arranged between the positive plate and the negative plate. The portions of the positive electrode sheet and the negative electrode sheet having the active material constitute the main body portion of the battery cell, and the portions of the positive electrode sheet and the negative electrode sheet having no active material constitute the tab 23a, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a is connected to the electrode terminal to form a current loop.
According to some embodiments of the present application, reference is made to fig. 3, and further reference is made to fig. 4 to 8, fig. 3 is a schematic structural diagram of a battery cell blanking apparatus according to some embodiments of the present application, fig. 4 is a schematic structural diagram of an inner clamping needle in the battery cell blanking apparatus according to some embodiments of the present application when the inner clamping needle in the battery cell blanking apparatus is in an initial position, fig. 5 is a schematic structural diagram of a prepressing device in the battery cell blanking apparatus according to some embodiments of the present application when the inner clamping needle in the battery cell blanking apparatus is in a final position, fig. 6 is a schematic structural diagram of a prepressing device in the battery cell blanking apparatus according to some embodiments of the present application when the prepressing device in the battery cell blanking apparatus works, fig. 7 is a schematic structural diagram of a prepressing device in the battery cell blanking apparatus according to some embodiments of the present application.
The application provides a battery cell blanking device which is used for blanking a battery cell 23 wound by a winding needle 300 and comprises a spreading component 210 used for spreading the battery cell 23 from an initial form to a final form. The spreading assembly 210 includes a spreading driving member and two clamping jaws 211, the two clamping jaws 211 are oppositely arranged along the spreading direction of the battery cell 23, and the spreading driving member is configured to provide driving force when the two clamping jaws 211 perform spreading movement. The opening assembly is provided with a controller which is connected with the opening driving piece.
Specifically, the clamping jaw 211 includes an inner clamping needle 2111, an outer clamping needle 2112, and a clamping driver, the inner clamping needle 2111 being used for abutting against an inner ring of the cell 23, the outer clamping needle 2112 being used for abutting against an outer ring of the cell 23, the clamping driver being configured to drive the inner clamping needle 2111 and the outer clamping needle 2112 to approach each other to clamp the cell 23.
When the battery cell 23 is in the initial state, the inner clip needle 2111 is located at the initial position; when the cell 23 is in the final state, the inner clamp needle 2111 is located in the final state. When the inner clamp needle 2111 moves to the final propped position, the controller controls the two clamping jaws 211 to stop the propping movement, and the battery cell 23 is in the final propped state.
As shown in fig. 3 and 4, the X direction in the drawing is the expanding direction of the battery cell 23; the Y direction is the pre-pressing direction of the battery cell 23; the Z direction is the axial direction of the cell 23. Wherein, X direction, Y direction and Z direction are mutually perpendicular two by two.
Wherein, the winding needle 300 is configured to wind the positive and negative electrode sheets and the separator, which is an insulator, between the positive and negative electrode sheets. The positive and negative electrode sheets and the separator are wound on the winding needle 300 to form the battery cell 23, and the battery cell 23 immediately after the winding is in an initial form. The battery cell blanking equipment 200 can take down the battery cells 23 on the winding needle 300 to finish the blanking of the battery cells 23. The inner clamping needle 2111 stretches the cell 23 so that the pole piece and the isolation diaphragm are in a compound connection, and the isolation diaphragm is no longer in a free state but is constrained by the pole piece. After the battery cell blanking equipment 200 is used for blanking, the isolating film is restrained and is not easy to retract, so that the possibility that the isolating film retracts to drive the pole pieces to move to cause overlarge gaps between the pole pieces of the battery cell 23, which are close to the inner ring part, is reduced, and the possibility that lithium precipitation is caused is further reduced.
In some embodiments, the opening driving member and the clamping driving member are respectively configured as air cylinders, and other driving members may be used, which will not be described herein. The cross sections of the inner clamping needle 2111 and the outer clamping needle 2112 are circular, and the inner clamping needle 2111 and the outer clamping needle 2112 with circular cross sections reduce the possibility of damaging the battery cell 23 in the process of contacting the battery cell 23. It is understood that the cross-sections of the inner clamp needle 2111 and the outer clamp needle 2112 may be configured in other shapes such as rectangular, oval, etc.
In the technical scheme of the embodiment of the application, the inner clamping needle 2111 stretches into the winding groove 310 of the winding needle 300, the two clamping jaws 211 can clamp the battery cell 23, the expanding driving member can drive the two clamping jaws 211 to be far away from each other so as to expand the battery cell 23, in the process of expanding the battery cell 23, when the inner clamping needle 2111 moves to the expanding final position, the controller stops expanding movement of the clamping jaws 211, and the battery cell 23 is in the expanding final state, compared with the prior art, the distance of expanding the battery cell 23 by the clamping jaws 211 is judged by virtue of the experience of workers, the expanding distance of the application is controlled by the controller, is more accurate, the situation that the pole pieces of the battery cell 23 are cracked by external force caused by overlarge expanding distance is avoided, the cracking situation at the corners of the battery cell 23 is particularly improved, meanwhile, too large gaps between the pole pieces of the inner ring of the battery cell 23 caused by overlarge expanding distance are avoided, and the blanking quality of the battery cell 23 is improved
In some embodiments, the distance between the initial position and the final position is D, the circumference of the winding needle 300 is a, the diameter of the inner clamp needle 2111 is B, the circumference of the inner clamp needle 2111 is C, c=pi B, D satisfies: d=a/2-C/2-B.
By defining and designing the distance D of the inner clamping needle 2111 moving when the battery cell 23 is propped, the situation that the pole piece of the battery cell 23 is cracked by external force due to overlarge propping distance is avoided, the cracking situation of the corner of the battery cell 23 is improved, meanwhile, too small propping distance is avoided, the gap between the pole pieces of the inner ring of the battery cell 23 is too large, and the quality of the battery cell 23 after being propped is improved. When producing the electric core 23 with different sizes and/or adopting the winding needle 300 and the inner clamping needle 2111 with different sizes, the distance between the accurate initial position and the supporting final position can be defined and calculated as D according to the specific produced electric core 23, the specific used winding needle 300 and the specific used inner clamping needle 2111, so that the supporting distance of the discharging equipment of the electric core 23 is more accurate, the situation that the pole piece of the electric core 23 is cracked by external force due to overlarge supporting distance is further reduced, the discharging quality of the electric core 23 is improved, meanwhile, the electric core 23 with different sizes can be produced, and production equipment with different sizes can be used, so that the discharging equipment of the electric core 23 has higher applicability.
In some embodiments, a deceleration position is provided between the initial position and the final position, the distance between the deceleration position and the initial position being H, H satisfying: h=d-1 mm, and after the spreader driver drives the inner clip 2111 to move to the speed-down position, the movement speed of the inner clip 2111 decreases.
In the process of moving the inner clamping needle 2111 from the initial position to the speed-down position, the battery cell 23 is gradually expanded, the battery cell 23 deforms from the circular shape to the oval shape in the initial shape, and after the battery cell 23 reaches the speed-down position, most of the deformation is completed, so that the moving speed of the inner clamping needle 2111 is reduced, the situation that the moving speed of the inner clamping needle 2111 is too high in the subsequent moving process and the pole piece of the battery cell 23 is cracked is avoided.
In some embodiments, the inner clamping needle 2111 is provided with a torque sensor 220, the torque sensor collects a torque signal E between the inner clamping needle 2111 and the inner ring pole piece of the battery cell 23, the opening driving member is connected with a controller, the torque sensor 220 is in signal transmission connection with the controller, and the controller is provided with a preset torque F, wherein F satisfies: and E is greater than or equal to F, the controller controls the opening driving piece to drive the clamping jaw 211 to stop moving.
The torque sensor 220 collects the torque of the inner clamping needle 2111, when the torque signal E is larger than the preset torque F, the opening driving piece is stopped, the movement of the inner clamping needle 2111 is stopped, and the inner clamping needle 2111 is prevented from continuously moving to open the pole piece of the battery cell 23 through a displacement and torque blanking mode.
In some embodiments, after inner clamp needle 2111 is moved to the reduced speed position, torque sensor 220 begins transmitting torque signal E to the controller. After inner clamp needle 2111 reaches the reduced speed position, torque sensor 220 begins to transmit torque signal E such that torque sensor 220 does not always activate.
In some embodiments, the cell blanking apparatus 200 is provided with a PLC control panel, which is connected to the controller.
The PLC control panel is convenient for an operator to operate, the opening distance D and the preset moment F are set or changed for the battery cells 23 of different models, and the intellectualization and operability of the battery cell blanking equipment 200 are improved.
In some embodiments, the cell blanking apparatus 200 further includes a pre-pressing device 230, where the pre-pressing device 230 is configured to pre-press the cells 23 in the final state.
The fully pre-pressed battery 100 after the winding of the battery core 23 improves the constant current charge capacity and discharge capacity under the high-rate test condition, compared with the non-pre-pressed or the unilateral pre-pressed of the positive and negative electrode plates. The pre-pressing improves the interface between the electrode and the diaphragm, is favorable for forming a stable SEI film, and an alternating current impedance test shows that the interface resistance of the fully pre-pressed battery 100 and the integral internal resistance bucket of the battery 100 are smaller, the cycle performance is more stable, the pre-pressing of the battery core 23 is favorable for improving the interface between the electrode plate and the diaphragm, and the performance of the battery 100 is improved.
The pre-pressing device 230 pre-presses the battery cell 23 in the winding and discharging process, so that the next manufacturing process can be conveniently used, pre-pressing equipment does not need to be independently arranged, the feeding and discharging work of one-time pre-pressing is reduced, and the production efficiency is improved.
In some embodiments, the pre-pressing device 230 includes an upper pre-pressing plate 232 and a lower pre-pressing plate 231, the lower pre-pressing plate 231 is used for placing the battery cell 23, the upper pre-pressing plate 232 is connected with a pre-pressing driving member, and the pre-pressing driving member is configured to drive the lower pre-pressing plate 231 to approach the lower pre-pressing plate 231 along a direction perpendicular to the expanding direction, and the second direction is parallel to the other radial direction of the battery cell 23 and perpendicular to the first direction.
The direction perpendicular to the opening direction is the pre-pressing direction of the battery cell 23. The lower pre-pressing plate 231 is used for receiving the battery cell 23, and the upper pre-pressing plate 232 is driven by the pre-pressing driving piece to gradually approach the lower pre-pressing plate 231 along the pre-pressing direction, so that the battery cell 23 is pre-pressed in the approaching process.
In some embodiments, at least a portion of the surface of lower pre-press 231 facing cell 23 is configured to be planar, and at least a portion of the surface of upper pre-press 232 facing cell 23 is configured to be planar.
The surface that lower pre-compaction board 231 contacted with electric core 23 when carrying out the pre-compaction to electric core 23 is the plane at least for lower pre-compaction board 231 has better pre-compaction effect to electric core 23, and the surface that goes up pre-compaction board 232 contacted with electric core 23 when carrying out the pre-compaction to electric core 23 is the plane at least, makes to go up pre-compaction board 232 to electric core 23 have better pre-compaction effect, goes up pre-compaction board 232 and the pre-compaction quality after pre-compaction device 230 and electric core 23 are carried out to the structure of lower pre-compaction board 231 promotion pre-compaction effect.
In some embodiments, a follower drive is coupled to the spreader assembly 210 and is configured to drive the spreader assembly 210 in a second direction proximate the lower pre-compression plate 231. The following driving member may be configured as a cylinder, and the cylinder is disposed in the second direction, and it is understood that other power driving sources may be selected for the following driving member.
In the pre-pressing process, when the lower pre-pressing plate 231 pre-presses the battery cells 23, the battery cells 23 are pressed from a final state to a flat state, the opening assembly 210 can move along with the pressing movement of the lower pre-pressing plate 231, and in the stage that the pre-pressing assembly just starts pre-pressing the battery cells 23, the opening assembly 210 has a certain positioning effect on the battery cells 23, so that random movement of the battery cells 23 in the pre-pressing process is avoided, the stability of pre-pressing work is improved, and the pre-pressing quality of the battery cells 23 is improved.
In some embodiments, a withdrawal needle driver is connected to the spreader assembly 210 and is configured to drive the spreader assembly 210 axially along the cell 23 out of the cell 23. The following needle pulling driving piece can be configured as an air cylinder, and the air cylinder is arranged in the second direction, and it can be understood that other power driving sources can be selected by the needle pulling driving piece.
In the pre-pressing process, the upper pre-pressing plate 232 and the lower pre-pressing plate 231 also have clamping effect on the battery cell 23, and after the battery cell 23 is clamped by the upper pre-pressing plate 232 and the lower pre-pressing plate, the inner clamping needle 2111 is conveniently pulled out of the battery cell 23, and the needle pulling work of the inner clamping needle 2111 is completed.
In some embodiments, the application provides a method for blanking a battery cell, which comprises the following steps:
s1, clamping an inner ring and an outer ring of an electric core 23 by adopting at least two clamping jaws 211 in a stretching assembly 210;
s2, withdrawing the winding needle 300;
s3, setting the final supporting position of the inner clamp needle 2111;
and S4, the two clamping jaws 211 prop open the battery cell 23, and when the inner clamping needle 2111 moves to the propping end position, the two clamping jaws 211 are controlled to stop the prop-open movement.
The two clamping jaws 211 can clamp the battery cell 23, the expanding driving piece can drive the clamping jaws 211 to be far away from each other to expand the battery cell 23, when the inner clamping needle 2111 moves to the expanding final position in the process of expanding the battery cell 23, the controller stops expanding the clamping jaws 211, and the battery cell 23 is in the expanding final state.
In some embodiments, step S3 specifically includes:
s31, defining that when the battery cell 23 is in an initial state, the inner clamp needle 2111 is positioned at an initial position; when the cell 23 is in the final state, the inner clamping needle 2111 is positioned at the final position;
s32, the distance between the initial position and the final position is D, the circumference of the winding needle 300 is a, the diameter of the inner clamping needle 2111 is B, the circumference of the inner clamping needle 2111 is C, c=pi B, and D satisfies: d=a/2-C/2-B.
By defining and designing the distance D of the inner clamping needle 2111 moving when the battery cell 23 is propped, the situation that the pole piece of the battery cell 23 is cracked by external force due to overlarge propping distance is avoided, the cracking situation of the corner of the battery cell 23 is improved, meanwhile, too small propping distance is avoided, the gap between the pole pieces of the inner ring of the battery cell 23 is too large, and the quality of the battery cell 23 after being propped is improved. When producing the battery cell 23 of different size models, and/or adopting the rolling needle 300, the inner clamping needle 2111 of different size models, the distance between the accurate initial position and the supporting final position can be defined and calculated as D according to the battery cell 23, the rolling needle 300 and the inner clamping needle 2111 which are specifically produced, so that the supporting distance is more accurate, the situation that the pole piece of the battery cell 23 is cracked by external force due to overlarge supporting distance is further reduced, the blanking quality of the battery cell 23 is improved, meanwhile, the battery cell 23 of different size models can be produced, and production equipment of different size models can be used.
In some embodiments, step S4 specifically includes:
s41, the inner clamping needle 2111 is provided with a moment sensor 220, and the moment sensor collects a moment signal E between the inner clamping needle 2111 and an inner ring pole piece of the battery cell 23;
s42, setting a preset moment F of the inner clamp needle 2111;
s43, F satisfies: E.gtoreq.F, the two clamping jaws 211 are controlled to stop the opening movement.
Through the specific arrangement in the above step S4, the torque sensor 220 collects the torque of the inner clamping needle 2111, and when the torque signal E is greater than the preset torque F, the opening driving member is stopped, the movement of the inner clamping needle 2111 is stopped, and the inner clamping needle 2111 is prevented from opening the pole piece of the battery cell 23.
In some embodiments, step S5 is further included, and step S5 specifically includes pre-pressing the battery cell 23.
Through above-mentioned step S5, the electric core 23 unloading in-process is prepressed, can be convenient for the use of next manufacturing process, need not set up the pre-compaction equipment alone, reduces the material loading and the unloading work of a pre-compaction, promotes production efficiency.
According to some embodiments of the present application, referring to fig. 3 to 8, the present application provides a battery cell blanking apparatus 200, which includes a spreader assembly 210, wherein the spreader assembly 210 is used for spreading a battery cell 23 from an initial configuration to a final configuration, and the spreader assembly 210 is connected with a following driving member and a needle pulling driving member. The expanding assembly 210 comprises an expanding driving member and two clamping jaws 211, the expanding driving member is configured to drive the two clamping jaws 211 to be away from each other, the clamping jaws 211 comprise an inner clamping needle 2111, an outer clamping needle 2112 and a clamping driving member, the inner clamping needle 2111 is used for being abutted with the inner ring of the electric core 23, the outer clamping needle 2112 is used for being abutted with the outer ring of the electric core 23, and the clamping driving member is configured to drive the inner clamping needle 2111 and the outer clamping needle 2112 to be close to each other along the expanding direction so as to clamp the electric core 23; when the cell 23 is in the initial state, the inner clamping needle 2111 is located at the initial position, when the cell 23 is in the final state, the inner clamping needle 2111 is located at the final position, the distance between the initial position and the final position is defined as D, the circumference of the winding needle 300 is a, the diameter of the inner clamping needle 2111 is B, the circumference of the inner clamping needle 2111 is C, c=pi B, and D satisfies: d=a/2-C/2-B.
A deceleration position is arranged between the initial position and the supporting final position, the distance between the deceleration position and the initial position is H, and H meets the following conditions: h=d-1 mm, and after the spreader driver drives the inner clip 2111 to move to the speed-down position, the movement speed of the inner clip 2111 decreases. The inner clamping needle 2111 is provided with a torque sensor 220, a torque signal between the torque sensor collected by the inner clamping needle 2111 and the inner ring pole piece of the battery cell 23 is E, the opening driving piece is connected with a controller, the torque sensor 220 is in signal transmission connection with the controller, the controller is provided with a preset torque F, and the torque F meets the following requirements: and E is greater than or equal to F, the controller controls the opening driving piece to drive the clamping jaw 211 to stop moving. After inner clamp needle 2111 moves to the reduced speed position, torque sensor 220 begins transmitting torque signal E to the controller. The cell blanking apparatus 200 further includes a pre-pressing device 230.
After the winding of the battery cell 23 on the winding needle 300 is completed, the inner clamping jaw 211 stretches into the battery cell 23 to clamp the battery cell 23, when the clamping jaw 211 clamps the winding battery cell 23 in a centering manner, after the winding needle 300 withdraws from the needle, the maximum distance D of the movement of the clamping needle and the upper limit F of the moment between the clamping needle and the pole piece are calculated according to the circumference A of the winding needle 300, the diameter of the inner clamping needle 2111 and the circumference C of the inner clamping needle 2111, and are set in a PLC control panel;
The inner clamping needle 2111 is gradually outwards opened by using horizontal displacement to form a gradually outwards opened electric core 23, the electric core 23 is flattened by a round shape in an initial form, when the opening distance reaches H, the opening speed of the inner clamping needle 2111 is rapidly reduced, as the inner clamping needle 2111 is slowly unfolded, the moment between the inner needle and a pole piece is gradually increased, the opening speed of the inner clamping needle 2111 is rapidly reduced, the moment sensor 220 starts to transmit moment data between the blanking clamping needle and the pole piece to the controller, and when the moment between the inner needle and the pole piece reaches a preset moment F, the inner clamping needle 2111 stops moving, and the pole piece can be prevented from being broken by excessively large opening force of the inner clamping needle 2111;
the electric core 23 is placed on the lower pre-pressing plate 231, the lower pre-pressing plate 231 provides support at the moment, the upper pre-pressing plate 232 gradually moves until the upper pre-pressing plate 232 is abutted against the electric core 23 under the premise that the inner clamping needle 2111 does not withdraw after the electric core 23 is placed stably, the electric core 23 starts to be extruded, the clamping jaw 211 is synchronously driven by the driving piece to move downwards from top to bottom for a certain distance, then the inner clamping needle 2111 and the outer clamping needle 2112 of the expanding assembly 210 are pulled out by the needle pulling driving piece, the upper pre-pressing plate 232 continues to press downwards, finally, the positive pole piece and the negative pole piece of the electric core 23 are compounded and adhered together, the inner ring is partially compounded in the blanking pre-shaping process of the electric core 23, namely, as shown in fig. 8, the blanking work of the electric core 23 is completed, and the pre-pressing work is completed. The expanding distance D of the inner clamping needle is defined, a displacement blanking mode or a displacement and moment blanking mode is set, the situation that the pole pieces of the battery cell 23 are cracked by external force due to the fact that the expanding distance is too large is avoided, meanwhile, the fact that gaps between the pole pieces of the inner ring of the battery cell 23 are too large due to the fact that the expanding distance is too small is avoided, and the quality of the battery cell 23 after being expanded is improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (12)
1. The utility model provides a battery core unloading equipment for with the battery core unloading of rolling up needle coiling, its characterized in that includes:
the cell expanding device comprises an initial form, an expanding assembly and a supporting assembly, wherein the expanding assembly is used for expanding a cell from the initial form to a final form, the expanding assembly comprises an expanding driving piece and two clamping jaws, the two clamping jaws are oppositely arranged along the expanding direction of the cell, the expanding driving piece is configured to provide expanding driving force for the two clamping jaws, the expanding assembly is provided with a controller, and the controller is connected with the expanding driving piece;
Each clamping jaw comprises an inner clamping needle and an outer clamping needle which are respectively clamped on the inner ring and the outer ring of the battery cell; defining that the inner clamping needle is positioned at an initial position when the electric core is positioned at the initial state; when the battery cell is in the final supporting form, the inner clamping needle is positioned at the final supporting position;
when the inner clamping needle moves to the final supporting position, the controller controls the two clamping jaws to stop the supporting movement, and the battery cell is in the final supporting form;
the distance between the initial position and the final supporting position is D, the circumference of the winding needle is A, the diameter of the inner clamping needle is B, the circumference of the inner clamping needle is C, C=pi B, and D satisfies the following conditions: d=a/2-C/2-B.
2. The cell blanking apparatus of claim 1, wherein a deceleration position is provided between the initial position and the final position, a distance between the deceleration position and the initial position is H, and the H satisfies: h=d-1 mm, and the movement speed of the inner clip is reduced after the inner clip is driven to move to the speed reducing position by the opening driving member.
3. The battery cell blanking device of claim 2, wherein the inner clamping needle is provided with a torque sensor, the torque sensor collects a torque signal between the inner clamping needle and the battery cell inner ring pole piece to be E, the torque sensor is in signal transmission connection with the controller, the controller is provided with a preset torque F, and the F satisfies: and E is more than or equal to F, the controller controls the opening driving piece to drive the clamping jaw to stop moving.
4. The cell blanking apparatus of claim 3 wherein said torque sensor begins to transmit said torque signal E to said controller after said inner clamp needle is moved to said deceleration position.
5. The cell blanking apparatus of any of claims 1-4, further comprising a pre-compression device for pre-compressing the cells in the final form.
6. The cell blanking apparatus of claim 5, wherein the pre-pressing means includes:
the lower pre-pressing plate is used for placing the battery cell;
the upper pre-pressing plate is connected with a pre-pressing driving piece, and the pre-pressing driving piece is configured to drive the lower pre-pressing plate to be close to the lower pre-pressing plate along the direction perpendicular to the opening direction.
7. The cell blanking apparatus of claim 6 wherein at least a portion of a surface of the lower pre-press plate facing the cell is configured to be planar;
the surface of the upper pre-pressing plate facing the battery cell is at least partially configured to be planar.
8. The cell blanking apparatus of claim 6, wherein the spreader assembly is connected with a follower drive configured to drive the spreader assembly to approach the lower pre-press plate in a direction perpendicular to the spreading direction.
9. The cell blanking apparatus of any of claims 1-4, wherein the spreader assembly is coupled with a pin extraction driver configured to drive the spreader assembly to be extracted from the cell along the cell axis.
10. A method for blanking a battery cell, characterized in that it is used in a battery cell blanking apparatus according to any of claims 1-9, said method comprising the steps of:
s1, clamping an inner ring and an outer ring of a battery cell by at least two clamping jaws in an expanding assembly;
s2, needle retracting of the winding needle;
s3, setting a final supporting position of an inner clamping needle, wherein the inner clamping needle is positioned at an initial position when the battery cell is defined to be in the initial state; when the battery cell is in the final supporting form, the inner clamping needle is positioned at the final supporting position; the distance between the initial position and the final supporting position is D, the circumference of the winding needle is A, the diameter of the inner clamping needle is B, the circumference of the inner clamping needle is C, C=pi B, and D satisfies the following conditions: d=a/2-C/2-B;
s4, the two clamping jaws prop open the electric core, and when the inner clamping needle moves to the propping final position, the two clamping jaws are controlled to stop the prop-open movement.
11. The method of battery cell blanking according to claim 10, wherein the step S4 specifically includes:
s41, the inner clamping needle is provided with a moment sensor, and the moment sensor acquires a moment signal E between the inner clamping needle and the inner ring pole piece of the battery cell;
s42, setting a preset moment F of the inner clip needle;
s43, the F meets the following conditions: and when E is more than or equal to F, controlling the two clamping jaws to stop the opening movement.
12. The method according to any one of claims 10-11, further comprising step S5, wherein S5 specifically comprises pre-pressing the cells.
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| CN116213500B (en) * | 2023-05-09 | 2023-08-04 | 宁德时代新能源科技股份有限公司 | Tab shaping device, tab shaping method and battery production device |
| CN117644310B (en) * | 2024-01-29 | 2024-06-18 | 宁德时代新能源科技股份有限公司 | Battery top cover welding method and system |
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