Marking device, marking process and lithium ion battery production system

Abstract

The embodiment of the invention provides a marking device, a marking process and a lithium ion battery production system, and relates to the field of new energy batteries. The marking device comprises a rubber coating roller, a movable roller, a sealing cutter, a first driving part, a second driving part and a detection part, the rubber coating roller is in transmission connection with the first driving part, the movable roller is in transmission connection with the second driving part, the movable roller and the rubber coating roller are used for being arranged on the two sides of a material belt respectively, the detection part is used for outputting position information expressing blank spaces on the material belt and communicating with the second driving part, and the sealing cutter is arranged on the movable roller in a protruding mode and used for periodically extruding the blank spaces. The first driving part drives the rubber coating roller to rotate to be used for conveying a material belt, the detection part is used for detecting the position of a blank on the material belt and sending an electric signal to the second driving part, so that the second driving part drives the movable roller to rotate, the sealing cutter rotates synchronously, and the blank is extruded to manufacture an indentation. Therefore, the defects of gaps at the bending part, inward folding and wrinkling of the diaphragm and the like are avoided, and the poor battery cell is avoided.

Description

Technical Field

[0001] The present invention relates to the field of new energy batteries, and in particular to a marking device, a marking process and a lithium ion battery production system. Background Art

[0002] In the production process of lithium-ion batteries, the battery cells need to be produced through multiple processes, including cutting the roll into single pieces, undergoing thermal compounding, size calibration, short circuit detection, waste sheet removal, and stacking into battery cells.

[0003] For the stacking method of producing battery cells, indentations will not be made at the bends in advance, but continuous material strips will be stacked directly, which can easily cause defects such as gaps at the bends and inward wrinkles of the diaphragm, thus leading to defective battery cells. Summary of the invention

[0004] The present invention provides a marking device, a marking process and a lithium-ion battery production system, which can make indentations at the bends in advance, thereby avoiding defects such as gaps, inward wrinkles of the diaphragm and the like at the bends, and avoiding defective batteries.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a marking device, which includes:

[0007] Rubber-coated roller, movable roller, sealing knife, first driving member, second driving member and detection member;

[0008] Among them, the rubber-coated roller is transmission-connected to the first driving member, the movable roller is transmission-connected to the second driving member, the movable roller and the rubber-coated roller are respectively used to be arranged on both sides of the material belt, the detection member is used to output position information representing the blank space on the material belt and communicate with the second driving member, and the sealing knife convex is arranged on the movable roller and is used to periodically squeeze the blank space.

[0009] Optionally, the number of the sealing knives is at least two, and at least two of the sealing knives are symmetrically arranged about the axis of the movable roller.

[0010] Optionally, the circumference of the rotation track of the cutting edge of the sealing knife is C, the number of the sealing knives is N, and the interval of the blank space is W, wherein C=N*W.

[0011] Optionally, the marking device further comprises a pressing member, the movable roller is connected to the pressing member, and the pressing member is used to drive the movable roller to approach or move away from the rubber-coated roller.

[0012] Optionally, the marking device further comprises a heating element, and the heating element is connected to the sealing knife.

[0013] Optionally, the heating element includes a heating tube and a temperature sensor, the heating tube is connected to the sealing knife and is used for generating heat, and the temperature sensor is used for outputting temperature information representing the sealing knife.

[0014] Optionally, the marking device further comprises a heat insulating member, and the heat insulating member is arranged between the sealing knife and the movable roller.

[0015] The embodiment of the present invention further provides a marking process, which is implemented by the marking device, and the marking process includes:

[0016] Controlling the detection element to obtain the position information of the blank space;

[0017] The first driving member is controlled to drive the rubber-coated roller to rotate, and the second driving member is controlled to drive the movable roller to rotate, so that the sealing knife periodically squeezes the blank.

[0018] Optionally, the step of controlling the second driving member to drive the movable roller to rotate includes:

[0019] Obtaining the circumference C of the rotation trajectory of the cutting edge of the sealing knife;

[0020] Obtain the number N of the sealing knives;

[0021] Obtaining the interval W between adjacent blank spaces;

[0022] When C>N*W, the second driving member is controlled to run at a constant speed first, then decelerate, then accelerate, and then run at a constant speed;

[0023] When C<N*W, the second driving member is controlled to run at a uniform speed first, then accelerate, then decelerate, and then run at a uniform speed.

[0024] An embodiment of the present invention further provides a lithium-ion battery production system, comprising the above-mentioned marking device, and used for implementing the above-mentioned marking process.

[0025] The beneficial effects of the marking device, marking process and lithium-ion battery production system of the embodiments of the present invention include, for example:

[0026] The marking device includes a rubber-coated roller, a movable roller, a sealing knife, a first driving member, a second driving member, and a detection member; wherein the rubber-coated roller is connected to the first driving member by transmission, the movable roller is connected to the second driving member by transmission, the movable roller and the rubber-coated roller are respectively used to be arranged on both sides of the material belt, the detection member is used to output the position information of the blank space on the material belt and communicate with the second driving member, and the sealing knife is convexly arranged on the movable roller and is used to periodically squeeze the blank space. During operation, the first driving member drives the rubber-coated roller to rotate to transmit the material belt, the detection member is used to detect the position of the blank space on the material belt, and sends an electrical signal to the second driving member, so that the second driving member drives the movable roller to rotate, so that the sealing knife rotates synchronously, and squeezes the blank space to make an indentation, thereby avoiding defects such as gaps at the bends, inward wrinkles of the diaphragm, and avoiding defective batteries.

[0027] The lithium-ion battery production system comprises a marking device, which has all the functions of a marking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic structural diagram of a marking device provided in an embodiment of the present invention at a first viewing angle;

[0030] Figure 2 It is a schematic structural diagram of the marking device provided in an embodiment of the present invention at a second viewing angle;

[0031] Figure 3 A schematic diagram of a cutting edge rotation trajectory provided in an embodiment of the present invention;

[0032] Figure 4 A motion planning diagram when C>N*W provided in an embodiment of the present invention;

[0033] Figure 5 A motion planning diagram when C<N*W is provided in an embodiment of the present invention.

[0034] Icons: 100-marking device; 110-rubber-coated roller; 120-active roller; 130-sealing knife; 135-blade rotation trajectory; 140-first driving member; 150-second driving member; 160-detection member; 165-light source; 170-pressing member; 180-heating member; 181-heating tube; 182-temperature sensor; 190-thermal insulation member; 200-material strip; 210-blank space. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0040] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0041] Unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0043] Please refer to Figure 1 and Figure 2 The marking device 100, the marking process and the lithium-ion battery production system provided in the embodiments of the present invention can solve the above problems, which will be described in detail below.

[0044] The marking device 100 is used in a lithium battery production system, and includes a rubber-coated roller 110, a movable roller 120, a sealing knife 130, a first driving member 140, a second driving member 150, and a detection member 160;

[0045] Among them, the rubber-coated roller 110 is transmission-connected to the first driving member 140, the movable roller 120 is transmission-connected to the second driving member 150, the movable roller 120 and the rubber-coated roller 110 are respectively used to be arranged on both sides of the material belt 200, the detection member 160 is used to output the position information of the blank space 210 on the material belt 200 and communicate with the second driving member 150, and the sealing knife 130 is protruded from the movable roller 120 and is used to periodically squeeze the blank space 210.

[0046] During operation, the first driving member 140 drives the rubber-coated roller 110 to rotate to transmit the material strip 200. The detecting member 160 is used to detect the position of the blank space 210 on the material strip 200 and send an electrical signal to the second driving member 150, so that the second driving member 150 drives the movable roller 120 to rotate, so that the sealing knife 130 rotates synchronously and squeezes the blank space 210 to create an indentation, thereby avoiding defects such as gaps at the bends, inward wrinkles of the diaphragm, and poor battery cells, and achieving the effect of high-precision operation.

[0047] It should be noted that the rubber-coated roller 110 and the movable roller 120 are actually located at the upper side and the lower side of the material belt 200 respectively, and can play a certain supporting role on the material belt 200 while transmitting the material belt 200.

[0048] Furthermore, in order to make the position detection of the detection member 160 more accurate, a light source 165 may be provided on the side of the material strip 200 away from the detection member 160 . The light source 165 is used to generate illumination to increase the detection accuracy obtained by the detection member 160 .

[0049] It is worth noting that when the detection member 160 obtains the position of the blank 210 (that is, the blank 210 passes the detection position of the detection member 160), a signal can be transmitted to other components, and the controller can fine-tune the rotation speed of the movable roller 120 driven by the first driving member 140 according to the received position of the blank 210, so as to ensure the accuracy of the sealing knife 130 in squeezing the blank 210 to avoid damaging the material strip 200.

[0050] Specifically, it is necessary to ensure that the signal time satisfies: total time = transmission time + algorithm time + communication time + response time < the moving time of the blank 210 from the detection position to the contact position with the sealing knife 130 .

[0051] It should be noted that the controller can be a PLC or a STM-32 series single-chip microcomputer, which is used to communicate with each component to realize the intelligent execution of the overall marking process.

[0052] refer to Figure 1 In order to adjust the distance between the movable roller 120 and the rubber-coated roller 110 and enable the sealing knife 130 to adjust the depth of the indentation of the blank 210, the marking device 100 may further include a pressing member 170, and the movable roller 120 is connected to the pressing member 170, and the pressing member 170 is used to drive the movable roller 120 to approach or move away from the rubber-coated roller 110.

[0053] refer to Figure 1 The marking device 100 further includes a heating element 180 , and the heating element 180 is connected to the sealing knife 130 .

[0054] Specifically, the heating element 180 includes a heating tube 181 and a temperature sensor 182 . The heating tube 181 is connected to the sealing knife 130 and is used for generating heat. The temperature sensor 182 is used for outputting temperature information representing the sealing knife 130 .

[0055] During the operation of the sealing knife 130 , the heating tube 181 can generate heat to increase the temperature of the sealing knife 130 , thereby making it easier for the sealing knife 130 to contact and squeeze the blank 210 to form an indentation. The temperature sensor 182 is used to detect the temperature information of the sealing knife 130 to prevent the sealing knife 130 from overheating.

[0056] At the same time, in order to avoid heat conduction to other components, the marking device 100 may also include a heat insulation member 190, which is arranged between the sealing knife 130 and the movable roller 120, that is, the heat insulation member 190 can block the heat on the sealing knife 130 from being conducted toward the movable roller 120.

[0057] refer to Figure 2 and Figure 3 The number of the sealing knives 130 is at least two, and the at least two sealing knives 130 are symmetrically arranged about the axis of the movable roller 120.

[0058] In the present embodiment, the number of sealing knives 130 is two sealing knives 130, and the included angle of the central angle formed by the two sealing knives 130 is 180°; of course, in other embodiments of the present invention, the number of sealing knives 130 can also be one, three, five, eight, etc., and there is no limitation on the specific number of sealing knives 130.

[0059] refer to Figure 2 and Figure 3 , the circumference of the edge rotation track 135 of the sealing knife 130 can be C, the number of sealing knives 130 is N, and the interval of the blank 210 is W, wherein C=N*W. It should be noted that the premise of this formula is that the movable roller 120 rotates at a uniform speed.

[0060] It is worth noting that the interval between the blank spaces 210 refers to the distance between two adjacent blank spaces 210 , which can also be understood as the width of a single pole piece, rather than the width of a single blank space 210 .

[0061] In theory, when designing the sealing blade 130 structure, the number of selected sealing blades 130 and the length of the cutting edge of the sealing blade 130 protruding from the movable roller 120 can be determined in order according to the interval of the blank 210. It should be noted that the interval of the blank 210 can be understood as the width of a single sheet of stacked cells.

[0062] In actual conditions, the width of a single piece is usually a range value, not a fixed value. That is, it can be understood that there are range end values ​​Wmax and Wmin, and N*Wmin<C<N*Wmax. In other words, in reality, there may be a situation where C>N*W or C<N*W, so under different size conditions, the energy consumption generated by the second driving member 150 will also be different.

[0063] refer to Figure 4 and Figure 5 In order to reduce the working energy consumption of the second driving member 150, it is necessary to plan the motion curve of the second driving member 150 or the movable roller 120 so as to reduce the driving energy consumption.

[0064] In addition, during the design phase, reasonable motion curve planning can reduce the configuration requirements for the drive components, such as motor power; conversely, if the drive component configuration remains unchanged, reasonable motion curve planning can adapt it to a higher operating speed, which will significantly improve production efficiency.

[0065] Specifically, when C>N*W, the first driving member 140 is controlled to run at a constant speed first, then decelerate, then accelerate, and then run at a constant speed; and when C<N*W, the first driving member 140 is controlled to run at a constant speed first, then accelerate, then decelerate, and then run at a constant speed. In the above two operating modes, the peak acceleration of the second driving member 150 can be reduced, thereby reducing the driving energy consumption.

[0066] In addition, during the working process, the blank 210 usually has a two-layer diaphragm structure, and the thickness of a single-layer diaphragm is 5um to 20um, so it is necessary to control the contact distance between the sealing knife 130 and the rubber-coated roller 110. If it is just in contact, that is, when the distance is 0, the actual marking effect is very poor, because the processing errors between the various parts will accumulate. Therefore, it is necessary to make a certain amount of interference when the sealing knife 130 contacts the rubber-coated roller 110 according to the amount of processing error. Specifically, the interference can be 0.5mm, which can neutralize the processing error within the normal range, ensure the marking effect of the blank 210, and will not damage the diaphragm.

[0067] In addition, since the width of the blank 210 is usually 1 mm to 2 mm, in order to prevent the sealing knife 130 from deviating from the blank 210 range and pressing the electrode, the sealing accuracy of the sealing knife 130 needs to be considered. The sealing accuracy can specifically include mechanical accuracy and control accuracy. The mechanical accuracy can be understood as the indentation width, and the control accuracy can be divided into detection accuracy and correction accuracy. That is, it needs to meet the following conditions: sealing accuracy = indentation accuracy + detection accuracy + correction accuracy < blank 210 width, so as to avoid extrusion damage to the material strip 200 as much as possible.

[0068] The embodiment of the present invention further provides a marking process, which is implemented by a marking device 100, and the marking process includes:

[0069] Step S100: controlling the detection element 160 to obtain the position information of the blank space 210;

[0070] Step S200 : controlling the first driving member 140 to drive the rubber coating roller 110 to rotate, and controlling the second driving member 150 to drive the movable roller 120 to rotate, so that the sealing knife 130 periodically squeezes the blank 210 .

[0071] Optionally, step S200 includes:

[0072] Step S210: obtaining the circumference C of the cutting edge rotation trajectory 135 of the sealing knife 130;

[0073] Step S220: obtaining the number N of sealing knives 130;

[0074] Step S230: obtaining the interval W between adjacent blank spaces 210;

[0075] Step S240: when C>N*W, the second driving member 150 is controlled to run at a constant speed, then decelerate, then accelerate, and then run at a constant speed;

[0076] When C<N*W, the second driving member 150 is controlled to run at a constant speed first, then accelerate, then decelerate, and then run at a constant speed again.

[0077] The embodiment of the present invention further provides a lithium-ion battery production system, including a marking device 100 and a power device, wherein the power device is used to provide power, and the marking device 100 is used to produce an indentation on the blank 210, thereby performing a marking process.

[0078] In summary, the marking device, marking process and lithium-ion battery production system provided by the embodiments of the present invention have at least the following advantages:

[0079] (1) It can detect the position of the blank space on the material strip through the detection member 160 and send an electrical signal to the second driving member, so that the second driving member drives the movable roller to rotate, so that the sealing knife rotates synchronously and squeezes the blank space to create an indentation, thereby avoiding defects such as gaps at the bends, inward wrinkles of the diaphragm, etc., avoiding defective batteries, and achieving the effect of high-precision operation.

[0080] (2) It determines the size relationship between the product of the number N of the sealing blades 130 and the interval W between the adjacent blanks 210 and the circumference C of the blade edge rotation trajectory 135, and when C>N*W, it limits the second driving member 150 to run in a manner of first uniform speed, then deceleration, then acceleration, and then uniform speed; when C<N*W, it limits the second driving member 150 to run in a manner of first uniform speed, then acceleration, then deceleration, and then uniform speed, thereby reducing the peak acceleration of the second driving member 150 and further reducing the driving energy consumption.

[0081] (3) Through reasonable motion curve planning, it can reduce the configuration requirements of the drive components, such as motor power; conversely, if the configuration of the drive components remains unchanged, reasonable motion curve planning can enable it to adapt to a higher operating speed, which has a significant improvement in production efficiency.

[0082] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A marking device, characterized in that: include: A rubber-coated roller (110), a movable roller (120), a sealing knife (130), a first driving member (140), a second driving member (150), and a detection member (160); The rubber-coated roller (110) is connected to the first driving member (140) by transmission, the movable roller (120) is connected to the second driving member (150) by transmission, the movable roller (120) and the rubber-coated roller (110) are respectively arranged on two sides of the material belt (200), the detection member (160) is used to output position information representing the blank space (210) on the material belt (200) and communicate with the second driving member (150), and the sealing knife (130) is protruding from the movable roller (120) and is used to periodically squeeze the blank space (210).

2. The marking device according to claim 1, characterized in that: The number of the sealing knives (130) is at least two, and the at least two sealing knives (130) are symmetrically arranged about the axis of the movable roller (120).

3. The marking device according to claim 2, characterized in that: The circumference of the blade rotation track (135) of the sealing knife (130) is C, the number of the sealing knives (130) is N, and the interval of the blank space (210) is W, wherein C=N*W.

4. The marking device according to claim 1, characterized in that: The marking device further comprises a pressing member (170), the movable roller (120) is connected to the pressing member (170), and the pressing member (170) is used to drive the movable roller (120) to approach or move away from the rubber-coated roller (110).

5. The marking device according to claim 1, characterized in that: The marking device further comprises a heating element (180), and the heating element (180) is connected to the sealing knife (130).

6. The marking device according to claim 5, characterized in that: The heating element (180) comprises a heating tube (181) and a temperature sensor (182); the heating tube (181) is connected to the sealing knife (130) and is used for generating heat; and the temperature sensor (182) is used for outputting temperature information representing the sealing knife (130).

7. The marking device according to claim 1, characterized in that: The marking device further comprises a heat insulating member (190), wherein the heat insulating member (190) is arranged between the sealing knife (130) and the movable roller (120).

8. A scar making process, characterized in that: The marking device according to any one of claims 1 to 7 is used, and the marking process includes: controlling the detection element (160) to obtain position information of the blank space (210); The first driving member (140) is controlled to drive the rubber-coated roller (110) to rotate, and the second driving member (150) is controlled to drive the movable roller (120) to rotate, so that the sealing knife (130) periodically squeezes the blank (210).

9. The scar making process according to claim 8, characterized in that: The step of controlling the second driving member (150) to drive the movable roller (120) to rotate comprises: Obtaining the circumference C of the rotation trajectory (135) of the cutting edge of the sealing knife (130); Obtaining the number N of the sealing knives (130); Obtaining the interval W between adjacent blank spaces (210); When C>N*W, the second driving member (150) is controlled to run at a constant speed, then decelerate, then accelerate, and then run at a constant speed; When C<N*W, the second driving member (150) is controlled to run at a constant speed first, then accelerate, then decelerate, and then run at a constant speed again.

10. A lithium-ion battery production system, characterized in that: The invention comprises the marking device described in any one of claims 1 to 7, and is used to implement the marking process described in claim 8 or 9.

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