WO2024239153A1 - 同步卷绕电极组件的装置及其方法、计算机存储介质 - Google Patents
同步卷绕电极组件的装置及其方法、计算机存储介质 Download PDFInfo
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- WO2024239153A1 WO2024239153A1 PCT/CN2023/095337 CN2023095337W WO2024239153A1 WO 2024239153 A1 WO2024239153 A1 WO 2024239153A1 CN 2023095337 W CN2023095337 W CN 2023095337W WO 2024239153 A1 WO2024239153 A1 WO 2024239153A1
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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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- the present application relates to the technical field of electrode assembly winding, and in particular to a device and method for synchronously winding an electrode assembly, and a computer storage medium.
- the embodiments of the present application provide a device and method for synchronously winding electrode assemblies, and a computer storage medium, which can reduce the adverse effects of unstable factors on synchronously winding electrode assemblies, reduce the probability of synchronous winding device downtime, and improve the production speed of electrode assemblies.
- a device for synchronously winding an electrode assembly comprising: a winding component, a cutting component and a cache component: wherein the cache component is located between the cutting component and the winding component; the winding component is used for synchronously winding a plurality of pole pieces; the cache component is used for caching a first target pole piece among the plurality of pole pieces, wherein the first target pole piece is a pole piece other than a reference pole piece among the plurality of pole pieces, and the reference pole piece is a pole piece having the longest detection length among the plurality of pole pieces; the cutting component is used for cutting the plurality of pole pieces when the first target pole piece is cached.
- excess electrode sheets in the electrode assembly corresponding to the first target electrode sheet are cached between the cutting component and the winding component through a cache component, so that the used lengths of electrode sheets from the same material roll in multiple electrode assemblies are closer, thereby reducing the impact of unstable factors on the synchronously wound electrode assembly, reducing the probability of shutdown of the synchronous winding device, and improving the production speed of the electrode assembly.
- the cache component is used to cache a pole segment of a first length of a first target pole piece, wherein the first length is a difference between a detection length of the first target pole piece and a detection length of a reference pole piece.
- the caching status of the first target pole piece by the cache component is determined by the difference between the detection length of the first target pole piece and the detection length of the reference pole piece, and the excess pole piece can be accurately compensated to the tail of the corresponding electrode assembly, thereby making the lengths of the pole pieces used by multiple electrode assemblies closer.
- the apparatus for synchronously winding an electrode assembly further includes: a tension adjustment component, which is used to adjust the tension of the plurality of pole pieces; wherein the tension adjustment component is located upstream of the cutting component. In this way, the transmission process of the plurality of pole pieces can be provided with corresponding tension, which is conducive to obtaining a better winding effect.
- the tension adjustment component includes a plurality of tension members corresponding to the plurality of pole pieces. Adjustment subcomponents, wherein each tension adjustment subcomponent is used to adjust the tension of a corresponding pole piece.
- each tension adjustment subcomponent can cache the pole segments of the corresponding pole piece while adjusting the tension of the corresponding pole piece, when the cache component does not cache the first target pole piece, the redundant pole pieces can be cached on the corresponding tension adjustment subcomponent, thereby further reducing the probability of pole piece accumulation during the transmission process, which is beneficial to the normal operation of the synchronously wound electrode assembly device.
- the cache component when the tension adjustment subcomponent corresponding to the first target pole piece is in a limited state, the cache component is used to cache a pole segment of a second length of the second target pole piece, and the second target pole piece is the pole piece corresponding to the tension adjustment subcomponent in a non-limited state.
- the length of the actual cache of the first target pole piece by the cache component is usually greater than the first length, which will cause the tension adjustment subcomponent to deviate from the normal state, and if the length of the cache component caches the first target pole piece for multiple times is greater than the first length, the corresponding tension adjustment subcomponent will deviate more and more from the normal state, thereby reaching the limit state.
- the pole segment of the second length of the second target pole piece can be cached. In this way, the adverse effects of mechanical errors on the device of the synchronously wound electrode assembly can be reduced.
- the second length is determined according to a variation range of the pole piece length corresponding to the tension adjustment subcomponent.
- the buffer error of the buffer component to the first target pole piece can be determined by the pole piece length variation range corresponding to the tension adjustment subcomponent. Therefore, by determining the second length by the pole piece length variation range, the corresponding mechanical error can be compensated according to the actual situation, and the mechanical error can be compensated well.
- the second length is one third to two thirds of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the tension adjustment component since the tension adjustment component is usually changed from a normal working state to a limited state, the change in the length of the pole piece corresponding to the tension adjustment component is usually one-third to two-thirds of the maximum pole piece length. In this way, not only most working conditions can be used, but also mechanical errors can be compensated more accurately to obtain a better winding effect.
- the second length is half of the maximum pole piece length change corresponding to the tension adjustment component.
- the tension adjustment component when the tension adjustment component is in the normal working condition, the corresponding pole piece length is half of the maximum pole piece length change. And, under normal circumstances, the tension adjustment component is basically in the normal working condition. That is to say, due to the existence of mechanical errors, the tension adjustment component will change from the normal working condition state to the limit state, and the change in the length of the pole piece corresponding to the tension adjustment component is usually half of the maximum pole piece length change corresponding to the tension adjustment component. Therefore, the mechanical error can be compensated more accurately to obtain a better winding effect.
- the second length is determined based on the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the tension adjusting sub-components corresponding to the plurality of first target pole pieces are all in the limit state, due to the different influences of the mechanical errors of the buffer components, the tension adjusting sub-components in the limit state Furthermore, the shorter the pole piece length corresponding to the tension adjustment subcomponent in the limited state is, the greater the impact of the mechanical error of the buffer component is. In order to better compensate for the mechanical error, the second length can be determined according to the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the cutting component is further used to: cut off the corresponding anode electrode piece based on the cut length of the anode electrode piece, and the cut length of the anode electrode piece is determined based on the buffer length of the cathode electrode piece corresponding to the tension adjustment sub-component in the limited state.
- the cut length of the anode electrode piece can be at least b longer than the cut length of the cathode electrode piece, which can improve the qualified rate of the electrode assembly.
- b is the difference between the length of the anode electrode piece and the length of the cathode electrode piece in the standard electrode assembly.
- the cut-off length of the anode electrode piece is determined by the buffer length of the second target electrode piece, the standard length of the anode electrode piece, and the difference between the detection lengths of different anode electrode pieces. In this way, when the electrode piece corresponding to the tension adjustment subcomponent in the limit state is the cathode electrode piece, and the detection lengths of the anode electrode pieces of multiple electrode assemblies are different, multiple electrode assemblies that meet the standards can be obtained, thereby improving the qualified rate of the electrode assemblies.
- the cut-off length of the anode electrode piece is equal to the sum of the buffer length of the second target electrode piece, the standard length of the anode electrode piece, and the difference between the detection lengths of N times different anode electrode pieces. In this way, the length of the anode electrode piece can be increased, the number of electrode assemblies that meet the standards can be further increased, and the qualified rate of the electrode assemblies can be further improved.
- the cache component includes multiple cache subcomponents corresponding to multiple pole pieces; wherein each cache subcomponent is used to cache the corresponding pole piece.
- each pole piece can be cached accordingly, which not only allows for more working scenarios, but also allows the pole pieces from the same material roll in multiple electrode assemblies to have closer lengths.
- each cache subcomponent includes a plurality of fixed rollers and a plurality of movable rollers, the plurality of fixed rollers and the plurality of movable rollers are respectively located on both sides of the pole piece, at least one of the plurality of movable rollers moves toward one side of the plurality of fixed rollers to cache the corresponding pole segments of the pole piece, and the number of the plurality of fixed rollers is greater than or equal to the number of the plurality of movable rollers. In this way, the pole segments of the pole piece can be cached simply, flexibly, and accurately.
- each buffer sub-component includes an embossing roller, which is used to set convex points on the corresponding pole piece to buffer the pole segment of the pole piece. In this way, the pole segment of the pole piece can be conveniently buffered.
- each tension adjustment subcomponent includes two fixed rollers and movable rollers located on both sides of the line connecting the two fixed rollers; wherein, when each tension subcomponent is in a limited position, the distance between the fixed roller and the movable roller is within a preset range along a direction perpendicular to the line.
- the movable roller and the fixed roller it is convenient to provide tension to the pole pieces in the plurality of electrode assemblies being wound; and according to the relative position of the movable roller and the fixed roller, it is convenient to determine the corresponding state of the tension adjustment component.
- the difference between the detection length of the first target pole piece and the detection length of the reference pole piece is greater than a preset value. In this way, the number of times the cache component caches the first target pole piece can be reduced to a certain extent, thereby improving the efficiency of the synchronously wound electrode assembly under the premise that the detection lengths of multiple pole pieces are substantially equal.
- the preset value is between 1 mm and 2 mm. In this way, a balance can be achieved between substantially equal detection lengths of multiple pole pieces and the efficiency of the synchronously wound electrode assembly.
- the cache component is also used to cache the first target pole piece when the detected length of the first target pole piece meets a preset length, wherein the preset length is determined based on standard lengths of multiple pole pieces.
- the detection length of the first target pole piece will also change in different regularities. Therefore, when the first target pole piece meets the preset length, that is, when the detection length of the first target pole piece is close to the standard length of multiple pole pieces, the first target pole piece can be cached. This can reduce the number of times the cache component caches the first target pole piece to a certain extent, thereby improving the efficiency of the synchronously wound electrode assembly.
- a method for synchronously winding an electrode assembly comprising: determining a first target pole piece among a plurality of synchronously wound pole pieces, the first target pole piece being a pole piece other than a reference pole piece among the plurality of pole pieces, the reference pole piece being a pole piece having the longest detection length among the plurality of pole pieces; caching the first target pole piece; and cutting off the plurality of pole pieces when the first target pole piece is cached.
- the detection length of the electrode sheets in the electrode assemblies other than the electrode assembly with the largest diameter can be increased, so that the use lengths of the electrode sheets from the same material roll in the multiple electrode assemblies are closer, thereby reducing the adverse effects of unstable factors on the synchronously wound electrode assemblies, reducing the probability of the synchronous winding device crashing, and improving the production speed of the electrode assemblies.
- caching the first target pole piece includes: caching a pole segment of a first length of the first target pole piece, wherein the difference between the detected length of the first target pole piece and the detected length of the reference pole piece.
- the method for synchronously winding an electrode assembly also includes: when a tension adjustment subcomponent corresponding to a first target pole piece is in a limited state, caching a pole segment of a second length of a second target pole piece among multiple pole pieces, wherein the tension adjustment subcomponent is used to adjust the tension of the corresponding pole piece; the second target pole piece is a pole piece corresponding to the tension adjustment subcomponent in a non-limited state; and when the second target pole piece is cached, cutting off multiple pole pieces.
- the second length is determined according to a variation range of the pole piece length corresponding to the tension adjustment subcomponent.
- the second length is one third to two thirds of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the second length is half of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the second length is determined based on the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the method further comprises: The buffer length of the cathode electrode piece determines the cut-off length of the corresponding anode electrode piece.
- the cut-off length of the anode pole piece is determined by the buffer length of the cathode pole piece, the standard length of the anode pole piece, and the difference between the detection lengths of different anode pole pieces.
- the cut-off length of the anode pole piece is equal to the sum of the buffer length of the cathode pole piece, the standard length of the anode pole piece and the difference between N times the detection lengths between different anode pole pieces.
- the difference between the detection length of the first target pole piece and the detection length of the reference pole piece is greater than a preset value.
- the preset value is between 1 mm and 2 mm.
- caching the first target pole piece includes: caching the first target pole piece when the detected length of the first target pole piece meets a preset length, wherein the preset length is determined based on standard lengths of multiple pole pieces.
- a device for synchronously winding an electrode assembly comprising a determination module, the determination module being used to determine a first target pole piece among a plurality of synchronously wound pole pieces, the first target pole piece being a pole piece other than a reference pole piece among the plurality of pole pieces, the reference pole piece being a pole piece having the longest detection length among the plurality of pole pieces; a cache module, the cache module being used to cache the first target pole piece; and a cutting module, the cutting module being used to cut off the plurality of pole pieces when the first target pole piece is cached.
- a computer-readable storage medium comprising a computer program, which, when executed on a computer, enables the computer to execute the method for synchronously winding an electrode assembly in the second aspect or any possible implementation of the second aspect.
- FIG1 shows a schematic structural diagram of a winding device provided in an embodiment of the present application
- FIG2 shows a partial schematic front view of a device for synchronously winding an electrode assembly provided in an embodiment of the present application
- FIG3 shows another partial schematic structural diagram of a synchronously wound electrode assembly device provided in an embodiment of the present application
- FIG4 shows a schematic structural diagram of a portion of the synchronously wound electrode assembly device shown in FIG3 , viewed from above;
- FIG5 shows a schematic diagram of the structure of an encoder according to an embodiment of the present application.
- FIG6 is a schematic structural diagram of a partial front view of another synchronously wound electrode assembly device provided in an embodiment of the present application.
- FIG7 shows a schematic structural diagram of a tension adjustment component provided in an embodiment of the present application.
- FIG8 is a schematic diagram showing a relationship between detection lengths of a plurality of pole pieces provided in an embodiment of the present application.
- FIG. 9 shows another schematic diagram of the relationship between the detection lengths of multiple pole pieces provided in an embodiment of the present application. picture
- FIG10 is a schematic diagram showing a relationship between detection lengths of a plurality of pole pieces provided in another embodiment of the present application.
- FIG11 is a schematic diagram showing the structure of a cache subcomponent provided in an embodiment of the present application.
- FIG12 is a schematic diagram showing the structure of another cache subcomponent provided in an embodiment of the present application.
- FIG13 is a schematic structural diagram of a tension adjustment subcomponent provided in an embodiment of the present application.
- FIG14 shows a schematic structural diagram of another tension adjustment subcomponent provided in an embodiment of the present application.
- FIG15 is a flow chart showing a method for synchronously winding an electrode assembly provided by an embodiment of the present application.
- FIG16 shows a block diagram of a device for synchronously winding an electrode assembly provided in an embodiment of the present application.
- the size of the serial number of each process does not mean the order of execution.
- the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
- the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator.
- the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, and the current collector not coated with the positive electrode active material layer serves as the positive electrode tab.
- the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.
- the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, and the current collector not coated with the negative electrode active material layer serves as the negative electrode tab.
- the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc.
- the material of the separator may be polypropylene (PP) or polyethylene (PE), etc.
- the electrode assembly may be a wound structure.
- the electrode assembly of the wound structure may be cylindrical as a whole, and the cylindrical electrode assembly is matched with a cylindrical housing to form a cylindrical battery cell as a whole.
- a winding device winds a group of positive electrode sheets, negative electrode sheets and separators to form an electrode assembly. After completing the battery assembly, the winding device continues to wind a group of positive electrode sheets, negative electrode sheets and separators to form the next battery assembly.
- the production efficiency of the battery assembly of this technical solution is low, which is not conducive to improving the production efficiency of battery cells and batteries.
- multiple electrode assemblies can be wound simultaneously to speed up the production of electrode assemblies.
- the electrode sheets of the same roll can be cut along the length direction to obtain multiple electrode sheets, such as the first electrode sheet and the second electrode sheet; the multiple electrode sheets are sent to the winding needle through multiple rollers for synchronous winding to obtain multiple electrode assemblies.
- the thickness of the separators in multiple electrode assemblies is different, where the thickness of the separators is usually in the range of 10 to 30um, and the thickness fluctuations of separators of different rolls and separators of the same roll generally show a fluctuation of ⁇ 1um.
- the change rules of the radius of multiple electrode assemblies will also be different.
- the lengths of the pole pieces on the incoming side of multiple electrode assemblies are basically equal, while the lengths of the pole pieces used in multiple electrode assemblies are different. This may cause some pole pieces to accumulate between multiple rollers or on the material belt, which will have an adverse effect on the synchronously wound electrode assembly.
- the amount of accumulated pole pieces is too much, it will also cause the synchronous winding device to shut down, reducing the production speed of the electrode assembly.
- an embodiment of the present application proposes a device for synchronously winding electrode assemblies, which caches excess electrode sheets in the electrode assembly corresponding to the first target electrode sheet between the cutting component and the winding component through a cache component, so that the used lengths of electrode sheets from the same material roll in multiple electrode assemblies are closer, thereby reducing the adverse effects of unstable factors on the synchronously wound electrode assemblies, reducing the probability of downtime of the synchronous winding device, and improving the production speed of the electrode assemblies.
- FIG1 shows a schematic structural diagram of a winding device provided in an embodiment of the present application.
- the first unwinding component 211 may be provided with a rotating shaft, on which a layer of pole pieces 201 (material roll) are wound.
- the pole pieces 201 wound on the shaft are output in a flat state, and the first unwinding component 211 completes the unwinding action.
- the pole piece 201 is a cathode pole piece or an anode pole piece.
- a conveying component may be provided downstream of the first unwinding component 211, for example, a plurality of roller structures as shown in FIG1 , or a conveyor belt, etc.
- the conveying component may pass through a plurality of processing components in the winding device 20 to realize the flow conveyance of the pole piece 201 in the winding device 20.
- the first cutting component 220 is disposed downstream of the first unwinding component 211 , and is used for receiving the pole piece 201 outputted from the first unwinding component 211 , and cutting the pole piece 201 along its length direction into a first pole piece 201 a and a second pole piece 201 b .
- the winding component 230 is disposed downstream of the first cutting component 220. After the first cutting component 220 cuts the pole piece 201 into the first pole piece 201a and the second pole piece 201b, the first pole piece 201a and the second pole piece 201b can be simultaneously transported by the conveying component and reach the winding component 230.
- the winding component 230 has a first winding part and a second winding part capable of simultaneous winding movement, and the first winding part and the second winding part are used to receive the first pole piece 201a and the second pole piece 201b respectively.
- the first winding part and the second winding part can simultaneously wind the first pole piece 201a, the second pole piece 201b and the isolation film to form the first electrode assembly and the second electrode assembly respectively.
- FIG2 shows a schematic structural diagram of a part of a synchronously wound electrode assembly provided in an embodiment of the present application, viewed from the front.
- FIG3 shows another schematic structural diagram of a part of a synchronously wound electrode assembly provided in an embodiment of the present application, viewed from the front.
- FIG4 shows another schematic structural diagram of a part of the synchronously wound electrode assembly shown in FIG3, viewed from the top.
- the device includes a winding component 230, a cutting component 240 and a cache component 250: wherein the cache component 250 is located between the cutting component 240 and the winding component 230; the winding component 230 is used to synchronously wind multiple pole pieces 201a-201b; the cache component 250 is used to cache the first target pole piece among the multiple pole pieces 201a-201b, wherein the first target pole piece is the pole piece other than the reference pole piece among the multiple pole pieces 201a-201b, and the reference pole piece is the pole piece with the longest detection length among the multiple pole pieces 201a-201b; the cutting component 240 is used to cut off the multiple pole pieces 201a-201b when the first target pole piece is cached.
- the winding component 230 can be driven by the same set of driving elements, preferably a servo motor, and the sum of the winding angles of the multiple electrode assemblies remains consistent. It should be understood that the winding component 230 is also used to wind the isolation film, that is, the winding component forms the electrode assembly by winding two pole pieces with different polarities and the isolation film.
- the cutting component 240 includes a fixed knife and a movable knife. When the cutting component 240 cuts off the multiple pole pieces 201a-201b, the fixed knife and the movable knife can cut off the multiple pole pieces 201a-201b by meshing when the multiple pole pieces 201a-201b are stationary.
- relative stillness can be that the multiple pole pieces 201a-201b stop, or that the multiple pole pieces 201a-201b are still moving, and the cutting component 240 accelerates along the moving direction of the multiple pole pieces 201a-201b so that the speed of the cutting component 240 is equal to the speed of the multiple pole pieces 201a-201b.
- the polarity of multiple pole pieces 201a-201b is the same.
- the detection length of multiple pole pieces 201a-201b can be determined by the encoder 260.
- the encoder 260 can be located upstream of the cutting component 240 and the cache component 250.
- the first target pole piece can be determined by the value on the encoder 260.
- the encoder 260 includes a counter 261, a pole piece pressure roller 262, an encoding roller 263 and an encoding roller mounting fixed end 264.
- the encoding roller 263 is installed on the equipment plate through the mounting fixed end 264.
- the pole piece When the pole piece passes by, it will drive the encoding roller 263 to rotate, and the encoding roller 263 drives the counter 261, that is, the product of the number of memory circles of the counter 261 and the circumference of the encoding roller 263 is the detection length of multiple pole pieces 201a-201b.
- the detection length of the plurality of pole pieces 201a-201b may also be the length of the pole pieces in the corresponding plurality of electrode assemblies.
- the length of the pole pieces in the electrode assembly may be calculated based on the value on the encoder 260, or the number of turns of the electrode assembly may be identified and determined based on the diameter of each turn.
- the buffer component 250 is used to buffer the electrode pieces that would not be wound into the electrode assembly with a smaller diameter between the cutting component 240 and the winding component 230. In other words, the buffer component 250 is used to buffer the excess electrode pieces in the electrode assembly with a smaller diameter between the cutting component 240 and the winding component 230.
- the buffer component 250 can increase the length of the first target electrode piece 201a in the buffer component 250 to achieve the buffering of the first target electrode piece 201a.
- the first target pole piece 201a applies a force perpendicular to the transmission direction of the first target pole piece 201a to change the transmission path of the first target pole piece 201a, or change the shape of the first target pole piece 201a.
- the cutting component 240 cuts off the plurality of pole pieces 201a-201b so that the lengths of pole pieces used by the plurality of electrode assemblies are closer.
- FIGS. 2 to 5 show the case where the number of the plurality of pole pieces is 2, but this number does not limit the number of the plurality of pole pieces, for example, the number of the plurality of pole pieces may be 3, 4, 5, etc. In other words, the number of the plurality of pole pieces is an integer greater than or equal to 2.
- the following will take the synchronous winding of two electrode assemblies as an example for explanation.
- the controller determines that the value of the encoder 260 on the first pole piece 201a is less than the value of the encoder 260 on the second pole piece 201b, that is, the diameter of the first electrode assembly is less than the diameter of the second electrode assembly.
- the controller controls the cache component 250 on the first pole piece 201a to cache the excess pole piece between the cutting component 240 and the winding component 230. As the excess pole piece is cached, the value of the encoder 260 on the first pole piece 201a increases, and the value of the encoder 260 on the first pole piece 201a is getting closer and closer to the value of the encoder 260 on the second pole piece 201b.
- the controller can control the cutting component 240 to cut off the first pole piece 201a and the second pole piece 201b at the same time when the cache component 250 on the first pole piece 201a caches the first pole piece 201a for a certain amount.
- the excess electrode sheets in the electrode assembly corresponding to the first target electrode sheet are cached between the cutting component 240 and the winding component 230 through the cache component 250, so that the used lengths of the electrode sheets from the same material roll in multiple electrode assemblies are closer, thereby reducing the adverse effects of unstable factors on the synchronously wound electrode assemblies, reducing the probability of downtime of the synchronous winding device, and improving the production speed of the electrode assemblies.
- the length of the first target electrode piece cached by the cache component 250 can be determined based on experimental values. For example, in the process of synchronously winding multiple electrode assemblies for multiple times, the detection lengths of multiple electrode pieces 201a-201b can be collected to obtain the difference in the detection lengths between the multiple electrode pieces 201a-201b, and the cache length of the first target electrode piece can be determined based on these differences. The length of the first target electrode piece cached by the cache component 250 can also be determined based on actual conditions.
- the cache component 250 is used to cache a pole segment of a first length of a first target pole piece, wherein the first length is a difference between a detection length of the first target pole piece and a detection length of a reference pole piece.
- the difference between the detected length of the first target pole piece and the detected length of the reference pole piece can be determined by the value on the corresponding encoder 260.
- the controller determines the first length based on the value of the encoder 260 on the first pole piece 201a and the value of the encoder 260 on the second pole piece 201b; the controller controls the cache component 250 to cache the pole segment of the first length of the first target pole piece between the cutting component 240 and the winding component 230; the controller controls the cutting component 240 to cut off the first pole piece 201a and the second pole piece 201b when the value of the encoder 260 on the first pole piece 201a and the value of the encoder 260 on the second pole piece 201b are equal or approximately equal, and the values of the two encoders 260 are greater than or equal to the standard length.
- the excess pole piece of the first length on the first pole piece 201 a can be wound to the tail of the first electrode assembly.
- the number of the plurality of pole pieces is greater than 2, the number of the first target pole pieces may be greater than or equal to 1. Furthermore, the first target pole pieces may be respectively measured according to the difference between the detection lengths of the first target pole pieces and the reference pole pieces. The first target pole piece performs corresponding caching.
- the caching status of the first target pole piece by the cache component 250 is determined by the difference between the detection length of the first target pole piece and the detection length of the reference pole piece, so that the excess pole piece can be accurately compensated to the tail of the corresponding electrode assembly, thereby making the lengths of the pole pieces used by multiple electrode assemblies closer.
- a tension adjusting component 270 is used to adjust the tension of the plurality of pole pieces 201a-201b, wherein the tension adjusting component 270 is located upstream of the cutting component 240. In this way, the transmission process of the plurality of pole pieces 201a-201b can be provided with corresponding tension, which is conducive to obtaining a better winding effect.
- the tension adjusting component 270 can adjust the tension of the plurality of pole pieces 201a-201b by controlling the transmission path of the plurality of pole pieces 201a-201b.
- the tension adjusting component 270 may include a movable roller, a coupling roller, a motor, and a movable roller hard limit.
- the movable roller in the tension adjusting component 270 pulls the redundant pole pieces in the plurality of pole pieces 201a-201b to apply a certain pressure to the plurality of pole pieces 201a-201b, so that the tape running process of the plurality of pole pieces 201a-201b has corresponding tension.
- the synchronous winding electrode assembly device further includes a clamping and feeding component 280 with a clamping and deviation correction capability, the clamping and feeding component 280 has a certain ability to move along the axis of the clamping rod and has the ability to actively roll the electrode sheet, wherein a clamping roller of the clamping and feeding component 280 has an active rotation capability.
- the tension adjustment component 270 may include at least one tension adjustment subcomponent. The number of tension adjustment subcomponents may be determined according to actual conditions.
- the tension adjustment component 270 includes a plurality of tension adjustment subcomponents 270a-270b corresponding to the plurality of pole pieces 201a-201b, wherein each tension adjustment subcomponent is used to adjust the tension of the corresponding pole piece.
- each tension adjustment subcomponent is used to adjust the tension of the corresponding pole piece.
- the tension adjusting component 270 includes a first tension adjusting subcomponent 270a and a second tension adjusting subcomponent 270b.
- the first tension adjusting subcomponent 270a is used to adjust the tension of the first pole piece 201a
- the second tension adjusting subcomponent 270b is used to adjust the tension of the second pole piece 201b.
- the initial states of the first tension adjusting subcomponent 270a and the second tension adjusting subcomponent 270b are substantially the same.
- the state of the corresponding tension adjusting subcomponent and the corresponding pole piece length also change accordingly. For example, when the detection length of the first pole piece 201a is less than the detection length of the second pole piece 201b, the state of the first tension adjusting subcomponent 270a is the initial state, and the pole piece length corresponding to the first tension adjusting subcomponent 270a is longer than the pole piece length corresponding to the second tension adjusting subcomponent 270b.
- the cache component 250 caches the first pole piece 201a.
- the length of the pole piece corresponding to the first tension adjusting subcomponent 270a gradually decreases and becomes closer and closer to the initial state.
- the actual buffering condition of the buffer component 250 for the first pole piece 201a deviates from the ideal buffering condition. If the actual buffering length of the buffer component 250 for the first pole piece 201a is greater than the ideal buffering length, the state of the first tension adjustment subcomponent 270a will deviate from the initial state and approach the ideal state. Limit status.
- the error accumulates accordingly, the state of the first tension adjustment subcomponent 270a deviates increasingly from the initial state, and the pole piece length corresponding to the first tension adjustment subcomponent 270a becomes shorter and shorter, and eventually the tension of the first pole piece 201a cannot be adjusted, and the first pole piece 201a may even be disconnected.
- the buffer component 250 buffers a first target pole piece that is too long, it is also possible that the plurality of tension adjustment subcomponents 270a-270b are unable to adjust the tension of the corresponding first target pole piece.
- the cache component 250 when the tension adjustment subcomponent corresponding to the first target pole piece is in a limited state, the cache component 250 is used to cache a pole segment of a second length of the second target pole piece, and the second target pole piece is the pole piece corresponding to the tension adjustment subcomponent in a non-limited state.
- the tension adjustment subcomponent being in the limited state indicates that the tension adjustment subcomponent has a poor ability to adjust the tension of the first target pole piece.
- the state of the tension adjustment subcomponent can be determined by a position sensor. If the value of the position sensor reaches a threshold, it is determined that the tension adjustment subcomponent is in the limited state, wherein the threshold can be determined according to actual conditions.
- the controller may identify the images of the first tension adjusting subcomponent 270a and the second tension adjusting subcomponent 270b to determine whether the first tension adjusting subcomponent 270a and the second tension adjusting subcomponent 270b are in a limited state. If the controller determines that the first tension adjusting subcomponent 270a or the second tension adjusting subcomponent 270b is in a limited state according to the recognition result, the cache component 250 is controlled to cache the second length of the second target electrode piece, and the detection length of the second target electrode piece becomes longer.
- the controller controls the cutting component 240 to cut off the first electrode piece 201a and the second electrode piece 201b.
- the controller controls the cutting component 240 to cut off the first electrode piece 201a and the second electrode piece 201b.
- the first tension adjusting subcomponent 270a and the second tension adjusting subcomponent 270b are independent of each other, that is, the state of the first tension adjusting subcomponent 270a does not affect the state of the second tension adjusting subcomponent 270b.
- the buffer component 250 is used to buffer the second length of the pole segment of the first pole piece 201a when the second tension adjustment subcomponent 270b is in a limited state; or, when the first tension adjustment subcomponent 270a is in a limited state, buffer the second length of the pole segment of the second pole piece 201b. In this way, the compensation effect of the mechanical error can be further improved.
- the sum of the lengths of the second electrode pieces 201b used in the C second electrode assemblies may be greater than the sum of the lengths of the first electrode pieces 201a used in the C first electrode assemblies.
- the first electrode assemblies are all wound on the first winding part
- the second electrode assemblies are all wound on the second winding part
- the second electrode pieces 201b in the C second electrode assemblies are all first target electrode pieces, and C>1.
- the value of C is affected by the mechanical accuracy and the model of the tension adjustment subcomponent, and is specifically determined by the actual situation.
- the buffer component 250 buffers the first pole piece 201a to increase the length of the first pole piece 201a to be wound in the C+1 first electrode assembly. In this way, the sum of the use lengths of the first electrode sheets 201a in C+1 first electrode assemblies can be close to the sum of the use lengths of the second electrode sheets 201b in C+1 second electrode assemblies.
- the above embodiment shows a case where two electrode assemblies are wound synchronously, in which case the first target electrode piece and the second target electrode piece are different electrode pieces.
- the second target electrode piece is another part of the electrode pieces in the multiple first target electrode pieces and the reference electrode piece.
- the tension adjustment sub-components corresponding to another part of the electrode pieces in the first target electrode piece are in a non-limited state.
- the change of the tension adjustment subcomponent from the normal state to the limit state is caused by the excessive length of the cache component for the first target pole piece.
- the actual cache length of the first target pole piece by the cache component is greater than the first length.
- the pole segment of the second length of the second target pole piece can be cached. In this way, the adverse effects of mechanical errors on the device of the synchronously wound electrode assembly can be reduced.
- the cache length of the cache component 250 for the second target pole piece can be determined based on empirical values or based on actual conditions.
- the second length is determined according to the variation range of the pole piece length corresponding to the tension adjustment subcomponent.
- the corresponding mechanical error can be compensated according to the actual situation, and the mechanical error can be compensated better.
- the pole piece length corresponding to the tension adjustment subcomponent is the length of the pole piece in the tension adjustment subcomponent
- the pole piece length variation range corresponding to the tension adjustment subcomponent represents: the variation range of the pole piece length in the tension adjustment subcomponent when the tension adjustment subcomponent changes from a normal state to a limited state.
- the change of the tension regulating subcomponent can be determined by a position sensor, and the corresponding pole piece length change range can be determined according to the change of the tension regulating subcomponent.
- the second length is one third to two thirds of the maximum pole piece length variation corresponding to the tension adjustment subcomponent. In this way, the mechanical error can be compensated more accurately to obtain a better winding effect.
- the change in the length of the pole piece corresponding to the tension adjustment subcomponent is usually from two-thirds of the maximum pole piece length to one-third of the maximum pole piece length.
- the maximum pole piece length is the longest transmission path that the tension adjustment subcomponent can provide for the corresponding pole piece.
- the second length is the error length generated by C second electrode assemblies, that is, the second length can be the change in the length of the pole piece corresponding to the change of the second tension adjustment subcomponent 210b from the normal state to the limit state.
- the second length is half of the maximum pole piece length variation corresponding to the tension adjustment subcomponent. In this way, mechanical errors can be compensated more accurately and better winding effects can be obtained.
- the normal working condition of the tension adjustment subcomponent is the condition where half of the maximum pole piece length change amount corresponding to the tension adjustment subcomponent is present. Moreover, under normal circumstances, the tension adjustment subcomponent is basically in the normal working condition. In other words, due to the existence of mechanical errors, the tension adjustment subcomponent will change from the normal working condition to the limit state. state, and the change in the pole piece length corresponding to the tension adjustment subcomponent is usually half of the maximum pole piece length corresponding to the tension adjustment subcomponent.
- the second length may be determined according to the pole piece length variation range corresponding to any tension adjustment subcomponent in a limited state, or the second length may be determined according to the pole piece length variation range corresponding to the tension adjustment subcomponent in a limited state that meets the requirements.
- the second length is determined based on the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the tension adjustment subcomponents corresponding to the multiple first target pole pieces are all in the limited state
- the pole piece lengths corresponding to different tension adjustment subcomponents in the limited state are different.
- the shorter the pole piece length corresponding to the tension adjustment subcomponent in the limited state is, the greater the influence of the mechanical error of the buffer component is.
- the second length can be determined according to the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the multiple electrode pieces 201a-201b may be cathode electrode pieces of different electrode assemblies in the multiple electrode assemblies, or may be anode electrode pieces of different electrode assemblies in the multiple electrode assemblies.
- the first target electrode piece may be a cathode electrode piece and/or an anode electrode piece
- the second target electrode piece may be a cathode electrode piece and/or an anode electrode piece.
- the cutting component 240 is further used to: cut off the corresponding anode electrode piece based on the cut length of the anode electrode piece, and the cut length of the anode electrode piece is determined based on the buffer length of the cathode electrode piece corresponding to the tension adjustment sub-component in the limited state.
- the cut length of the anode electrode piece can be at least b longer than the cut length of the cathode electrode piece, which can improve the qualified rate of the electrode assembly.
- the anode and cathode plates in a qualified electrode assembly should meet the preset condition: the difference between the winding length of the anode plate and the winding length of the cathode plate is b. Therefore, during the winding process of the electrode assembly, the length of the cathode plate will affect the length of the anode plate.
- the cut-off length of the anode plate can be increased based on the cache length of the second target plate, and the corresponding anode plate can be cut off.
- the increase in the anode plate can be equal to the cache length of the second target plate, or it can be greater than the cache length of the second target plate.
- the cut-off length of the anode electrode piece is determined by the buffer length of the cathode electrode piece, the standard length of the anode electrode piece, and the difference between the detection lengths of different anode electrode pieces.
- the electrode piece corresponding to the tension adjustment subcomponent in the limited state is the cathode electrode piece, and the detection lengths of the anode electrode pieces of the multiple electrode assemblies are different, multiple electrode assemblies that meet the standards can be obtained, thereby improving the qualified rate of the electrode assemblies.
- the use length of the cathode electrode piece in the first electrode assembly may be greater than the standard length of the cathode electrode piece, and in order to meet the aforementioned preset conditions, it is necessary to determine the cutting length of the anode electrode piece in the first electrode assembly based on the cache length of the cathode electrode piece in the first electrode assembly.
- the cut-off length of the anode pole piece is equal to the sum of the buffer length of the second target pole piece, the standard length of the anode pole piece and the difference between the detection lengths of N times different anode pole pieces.
- the second target electrode piece is a cathode electrode piece
- the first target electrode piece and the second target electrode piece are anode electrode pieces and/or cathode electrode pieces
- the detection lengths of the anode electrode pieces on the first electrode assembly and the second electrode assembly are different.
- the cut-off length of the anode electrode piece can be set to the sum of the difference between the cache length of the second target electrode piece, the standard length of the anode electrode piece, and the detection lengths between N times different anode electrode pieces. Where N ⁇ 0. In this way, the length of the anode electrode piece can be increased, and the electrode assembly that meets the standard can be further increased, further improving the qualified rate of the electrode assembly.
- the present application proposes the following embodiments to describe the relationship between the detection length of the cathode electrode piece and the detection length of the anode electrode piece in corresponding application scenarios.
- the first target pole piece is a cathode pole piece and an anode pole piece
- the plurality of tension adjustment subcomponents 270 a - 270 b are in a normal state.
- Step 810 The winding unit winds up a plurality of electrode assemblies synchronously, and the controller determines a first length according to the detected length of each cathode electrode piece.
- step 820 the controller determines the length of the wound cathode electrode sheets in each electrode assembly.
- Step 830 the controller determines the relationship between the detection lengths of the cathode electrodes:
- the detection length La of the cathode piece of the first electrode assembly, the detection length Lb of the cathode piece of the second electrode assembly, and the standard length L1 of the cathode piece are equal.
- the cache component 250 caches the cathode electrode piece of the second electrode assembly.
- Step 850 the controller determines the relationship between the detection lengths of the anode pieces:
- the detection length Lc of the anode electrode piece of the first electrode assembly, the detection length Ld of the anode electrode piece of the second electrode assembly, and the standard length L2 of the anode electrode piece are equal.
- the cache component 250 caches the anode electrode piece of the second electrode assembly.
- the cutting component 240 can cut off the cathode electrode piece and the anode electrode piece respectively in different time periods.
- Step 880 finishing the plurality of electrode assemblies.
- the above embodiment describes the situation where the multiple tension adjustment subcomponents 270a-270b are all in a non-limited state.
- Other embodiments of the present application describe the situation where at least one tension adjustment subcomponent among the multiple tension adjustment subcomponents 270a-270b is in a limited state.
- the second target electrode piece is a cathode electrode piece and the first target electrode piece includes
- the synchronously wound electrode assembly device can perform the following actions.
- step 900 the winding unit winds a plurality of electrode assemblies synchronously and determines whether a detection length La of a cathode electrode piece of a first electrode assembly is greater than a detection length Lb of a cathode electrode piece of a second electrode assembly.
- Z1 represents the length of the electrode piece cached by the cache component 250 on the cathode electrode piece of the second electrode assembly.
- the cathode electrode piece of the second electrode assembly is the second target electrode piece.
- Step 910 determining whether the detection length Lc of the anode electrode piece of the first electrode assembly is greater than the detection length Ld of the anode electrode piece of the second electrode assembly.
- Z3 represents the length of the electrode piece cached by the cache component 250 on the anode electrode piece of the second electrode assembly, and Z3 may be equal to Z2. That is, the anode electrode piece of the second electrode assembly is the first target electrode piece.
- Z4 represents the length of the electrode piece cached by the cache component 250 on the cathode electrode piece of the first electrode assembly, and Z4 may be equal to Z1. That is, the cathode electrode piece of the first electrode assembly is the second target electrode piece.
- Step 920 determining whether the detection length Lc of the anode electrode piece of the first electrode assembly is greater than the detection length Ld of the anode electrode piece of the second electrode assembly.
- the anode electrode piece of the first electrode assembly is the first target electrode piece.
- the anode electrode piece of the second electrode assembly is the second target electrode piece.
- Step 930 performing final control based on the detected lengths of the cathode electrode piece and the anode electrode piece of the first electrode assembly and the detected lengths of the cathode electrode piece and the anode electrode piece of the second electrode assembly.
- Step 940 finishing the first electrode assembly and the second electrode assembly.
- the cathode electrode piece of the first electrode assembly and the cathode electrode piece of the second electrode assembly are cut off; and the anode electrode piece of the first electrode assembly and the anode electrode piece of the second electrode assembly are cut off.
- the cut-off length of the anode electrode piece is determined based on the sum of the differences in the cache length of the second target electrode piece, the standard length of the anode electrode piece, and the detection lengths between N times different anode electrode pieces, thereby increasing the probability of a qualified electrode assembly among multiple electrode assemblies that meets production standards.
- the synchronously wound electrode assembly device can perform the following actions.
- a winding unit winds a plurality of electrode assemblies synchronously and determines whether a detection length La of a cathode electrode piece of a first electrode assembly is greater than a detection length Lb of a cathode electrode piece of a second electrode assembly.
- the cathode electrode piece of the second electrode assembly is the second target electrode piece.
- Step 110 determining whether the detection length Lc of the anode electrode piece of the first electrode assembly is greater than the detection length Ld of the anode electrode piece of the second electrode assembly.
- the anode electrode piece of the first electrode assembly is the first target electrode piece.
- the anode electrode of the second electrode assembly is the first target electrode.
- the cathode electrode piece of the first electrode assembly is the second target electrode piece.
- Step 120 determining whether the anode electrode piece Lc of the first electrode assembly is greater than the detection length Ld of the anode electrode piece of the second electrode assembly.
- the anode electrode piece of the first electrode assembly is the first target electrode piece.
- the anode electrode piece of the second electrode assembly is the second target electrode piece.
- Step 130 performing final control based on the detected lengths of the cathode electrode piece and the anode electrode piece of the first electrode assembly and the detected lengths of the cathode electrode piece and the anode electrode piece of the second electrode assembly.
- Step 140 finishing the first electrode assembly and the second electrode assembly.
- the cutting member 240 cuts off the cathode electrode piece of the first electrode assembly and the cathode electrode piece of the second electrode assembly; and cuts off the anode electrode piece of the first electrode assembly and the anode electrode piece of the second electrode assembly.
- pole pieces can be saved to a certain extent, thereby reducing the production cost of the electrode assembly.
- the buffer component 250 buffers the electrode pieces of the second length for the corresponding cathode electrode piece and anode electrode piece, respectively. Furthermore, when the detection length of the anode electrode piece is at least longer than the detection length of the cathode electrode piece by b, the cutting component 240 cuts off the cathode electrode piece and the anode electrode piece.
- the buffer component 250 includes a plurality of buffer subcomponents 250a-250b corresponding to the plurality of pole pieces 201a-201b; wherein each buffer subcomponent is used to buffer the corresponding pole piece.
- the plurality of pole pieces 201a-201b can be better buffered, so that the pole pieces from the same material roll in the plurality of electrode assemblies have closer lengths.
- the multiple cache sub-components 250a-250b can be the same cache mechanism or different cache mechanisms.
- each cache subcomponent includes a plurality of fixed rollers 251a and a plurality of movable rollers 252b, the plurality of fixed rollers 251a and the plurality of movable rollers 252b are respectively located on both sides of the pole piece, at least one movable roller 252b among the plurality of movable rollers 252b moves toward one side D1 of the plurality of fixed rollers 251a to cache the pole segments of the corresponding pole piece, and the number of the plurality of fixed rollers 251a is greater than or equal to the number of the plurality of movable rollers 252b. In this way, the pole segments of the corresponding pole piece can be cached simply, flexibly and accurately.
- the buffer component 250 includes a first buffer subcomponent 250a and a second buffer subcomponent 250b.
- the first buffer subcomponent 250a includes X1 fixed rollers 251a and N1 movable rollers 252b; at least one movable roller 252b of the N1 movable rollers 252b is used to move toward a side D1 of the X1 fixed rollers 251a to buffer a first length of the first pole piece 201a, X1>N1, X1 and N1 are positive integers.
- X1 and N1 may also be N1+1 ⁇ X1 ⁇ 2N1.
- the N1 movable rollers 252b moves toward one side D1 of the X1 fixed rollers 251a, which means that at least one of the N1 movable rollers 252b may exceed the X1 fixed rollers 251a, or may not exceed the X1 fixed rollers 251a, which needs to be determined according to actual conditions.
- the greater the distance that the movable roller 252b moves toward the side D1 of the X1 fixed rollers 251a the longer the length of the cached first pole piece 201a.
- the N1 movable rollers 252b can be connected as one and driven simultaneously, or can be driven separately, and a movable roller structure with a number less than two movable rollers is preferred.
- At least one of the N1 movable rollers 252b is further used to move toward the X1 fixed rollers 251a when the second tension adjustment subcomponent 270b is in a limited state, so as to cache the pole segment of the second length of the first pole piece 201a.
- the pole segment of the second length of the first pole piece 201a can be cached simply, flexibly and accurately.
- the second buffer subcomponent 250b includes X2 fixed rollers 251b and N2 movable rollers 252b; at least one movable roller 252b of the N2 movable rollers 252b is used to move toward the direction of the X2 fixed rollers 251b to buffer the first length of the pole segment of the second pole piece 201b, X2>N2, X2 and N2 are positive integers. In this way, the first length of the pole segment of the second pole piece 201b can be simply, flexibly and accurately buffered.
- the relationship between X2 and N2 can also be N2+1 ⁇ X2 ⁇ 2N2.
- the movement of at least one of the N2 movable rollers 252b toward one side D1 of the X2 fixed rollers 251b indicates that at least one of the N2 movable rollers 252b may exceed the X2 fixed rollers 251b, or may not exceed the X2 fixed rollers 251b, which needs to be determined according to actual conditions.
- the greater the distance that the movable roller 252b moves toward the direction of the X2 fixed rollers 251b the longer the length of the cached second pole piece 201b.
- the N2 movable rollers 252b can be connected as one and driven simultaneously, or can be driven separately, and a movable roller 252b structure with a number less than two movable rollers 252b is preferred.
- At least one of the N2 movable rollers 252b is further used to move toward the X2 fixed rollers 251b when the first tension adjustment subcomponent 270a is in a limited state, so as to cache the second length of the pole segment of the second pole piece 201b. In this way, the second length of the pole segment of the second pole piece 201b can be cached simply, flexibly and accurately.
- each buffer sub-component includes an embossing roller, and the embossing roller is used to set convex points on the corresponding pole piece to buffer the pole segment of the pole piece. In this way, the pole segment of the pole piece can be conveniently buffered.
- Each buffer subcomponent may include a rubber roller and an embossing roller, and the embossing roller may provide convex points on the corresponding pole piece to increase the thickness of the convex point area of the corresponding pole piece.
- the thickness of the convex point area is positively correlated with the first length, and the thickness of the convex point area is also positively correlated with the second length.
- the cache component 250 includes a first cache subcomponent 250a and a second cache subcomponent 250b as an example for explanation.
- the first cache subcomponent 250a includes a first rubber roller 254a and a first embossing roller 253a (also referred to as embossing roller 253a), and the first embossing roller 253a is used to set convex points on the first pole piece 201a to cache the first length of the pole segment of the first pole piece 201a.
- the first embossing roller 253a is also used to set convex points on the first pole piece 201a to cache the second length of the pole segment of the first pole piece 201a when the second tension adjustment subcomponent 270b is in a limited state. In this way, the second length of the pole segment of the first pole piece 201a can be conveniently cached.
- the height of the bumps set by the first embossing roller 253a on the first pole piece 201a is also different depending on the state of the first tension adjusting subcomponent 270a, and thus the thickness of the bump area of the first pole piece 201a is also different.
- the second buffer subcomponent 250b includes a second embossing roller 253b (also referred to as embossing roller 253b), which is used to set convex points on the second pole piece 201b to buffer the pole segment of the first length of the second pole piece 201b. In this way, the pole segment of the first length of the second pole piece 201b can be conveniently buffered.
- a second embossing roller 253b also referred to as embossing roller 253b
- the second buffer component 250 may include a second rubber roller 254b and a second embossing roller 253b, and the second embossing roller 253b may set convex points on the second pole piece 201b to increase the thickness of the convex point area of the second pole piece 201b.
- the thickness of the convex point area is positively correlated with the pole segment of the first length of the second pole piece 201b.
- the second embossing roller 253b is further used to set a convex point on the second pole piece 201b to cache the pole segment of the second length of the second pole piece 201b when the second tension adjusting subcomponent 270b is in a limited state. In this way, the pole segment of the second length of the second pole piece 201b can be conveniently cached.
- the height of the protrusions set by the second embossing roller 253b on the second pole piece 201b is also different depending on the state of the second tension adjusting subcomponent 270b, and thus the thickness of the protrusion area of the second pole piece 201b is also different.
- each tension adjustment sub-component includes two fixed rollers and movable rollers respectively located on both sides of a line M connecting the two fixed rollers, wherein when each tension sub-component is in a limited state, along a direction D2 perpendicular to the line M, the distance between the fixed roller and the movable roller is within a preset range P1.
- the preset range P1 is determined according to actual conditions. Moreover, by setting the preset range, the distance between the fixed roller and the movable roller can be controlled, thereby reducing the probability of damage to the tension adjustment subcomponent.
- the tension adjustment component 270 includes a first tension adjustment subcomponent 270a and a second tension adjustment subcomponent 270b.
- the first tension adjustment subcomponent 270a includes two fixed rollers and two movable rollers;
- the second tension adjustment subcomponent 270b includes two fixed rollers and two movable rollers;
- the first tension adjustment subcomponent 270a is in a limited state when the distance between the two fixed rollers and the two movable rollers is within a preset range P1;
- the second tension adjustment subcomponent 270b is in a limited state when the distance between a plurality of fixed rollers in the two fixed rollers and the two movable rollers is within a preset range P1.
- the length of the pole piece in the first tension adjusting subcomponent 270a and the second tension adjusting subcomponent 270b is the length of the pole piece between the fixed roller and the movable roller.
- the pole piece length between the first movable roller 272a and the first fixed roller 271a is the maximum pole piece length corresponding to the first tension adjusting subcomponent
- the difference between the pole piece length between the first movable roller 272a and the first fixed roller 271a and the pole piece length within the preset range P1 is the maximum pole piece length change corresponding to the first tension adjusting subcomponent 270a.
- the pole piece length between the second movable roller 272b and the second fixed roller 271b is the maximum pole piece length corresponding to the second tension adjusting subcomponent 270b
- the difference between the pole piece length between the second movable roller 272b and the second fixed roller 271b and the pole piece length within the preset range P1 is the maximum pole piece length variation corresponding to the second tension adjusting subcomponent 270b.
- the device for synchronously winding the electrode assembly is adjusted accordingly according to the description of the above embodiment.
- the first movable roller 272a is affected by the buffer component 250 and moves toward the direction D2 of the first fixed roller 271a.
- the second movable roller 272b is affected by the buffer component 250 and moves toward the direction D2 of the second fixed roller 271b.
- the first target pole piece may be any pole piece among the multiple pole pieces 210a-210b except the reference pole piece, or may be a pole piece that meets the requirements among the multiple pole pieces 210a-210b except the reference pole piece.
- the difference between the detection length of the first target electrode piece and the detection length of the reference electrode piece is greater than a preset value.
- the buffer component 250 can reduce the detection length of the first target electrode piece to a certain extent.
- the number of times the pole piece is cached can be increased, thereby improving the efficiency of the synchronously wound electrode assembly under the premise that the detection lengths of multiple pole pieces are basically equal.
- the preset value may be determined according to the accuracy of a length detection component (eg, encoder 260) for detecting the plurality of pole pieces 210a-210b.
- a length detection component eg, encoder 260
- the preset value is between 1 mm and 2 mm. In this way, a balance can be achieved between substantially equal detection lengths of multiple pole pieces and the efficiency of the synchronously wound electrode assembly.
- the cache component is also used to cache the first target pole piece when the detected length of the first target pole piece meets a preset length, wherein the preset length is determined based on standard lengths of multiple pole pieces.
- the preset length can be determined according to the standard lengths of the plurality of pole pieces and the maximum buffering capacity of the buffer component 250.
- the difference between the preset length and the standard lengths of the plurality of pole pieces can be any value between 10 mm and 15 m, for example, 10 mm, 20 mm, 1 m, 5 m, 10 m, 11 m, 12 m, 14 m, 15 m, etc.
- the maximum buffering capacity of the buffer component 250 can be determined according to the movable distance between the movable roller 252b and the fixed roller 251a.
- the detection length of the first target pole piece will also change in different regularities. Therefore, when the first target pole piece meets the preset length, that is, when the detection length of the first target pole piece is close to the standard length of multiple pole pieces, the first target pole piece can be cached. This can reduce the number of times the cache component caches the first target pole piece to a certain extent, thereby improving the efficiency of the synchronously wound electrode assembly.
- the cache component 250 can cache the first target electrode piece when the number of turns of the electrode piece in the synchronously wound electrode assembly is within a preset number of turns, wherein the preset number of turns is determined according to the number of turns of the qualified electrode assembly.
- the number of turns of the electrode assembly is related to the standard length of multiple pole pieces.
- FIG. 15 shows a flow chart of a method for synchronously winding an electrode assembly provided in an embodiment of the present application.
- the method 400 for synchronously winding an electrode assembly includes the following contents.
- Step 410 determining a first target pole piece among the multiple synchronously wound pole pieces 201a-201b, wherein the first target pole piece is a pole piece among the multiple pole pieces except a reference pole piece, and the reference pole piece is a pole piece having the longest detection length among the multiple pole pieces.
- Step 420 cache the first target pole piece.
- Step 430 when the first target pole piece is cached, cutting off the plurality of pole pieces 201 a - 201 b .
- the detected lengths of the plurality of pole pieces 201 a - 201 b represent the lengths of the pole pieces to be wound in the plurality of electrode assemblies.
- the first target electrode piece is the first electrode piece 201a; if the diameter of the second electrode assembly is smaller than the diameter of the second electrode assembly, the first target electrode piece is the first electrode piece 201a; The first target electrode piece is the second electrode piece 201b.
- the first target electrode piece is cached, for example, when the first electrode piece 201a is cached, the first electrode piece 201a and the second electrode piece 201b are cut off to obtain two electrode assemblies with similar electrode piece lengths, and the number of turns of the first electrode piece 201a of the first electrode assembly is greater than the number of turns of the second electrode piece 201b of the second electrode assembly.
- the embodiment of the present application proposes a method 400 for synchronously winding electrode assemblies, which caches a first target electrode piece other than the electrode piece with the longest detection length among multiple electrode pieces 201a-201b, and cuts off multiple electrode pieces 201a-201b when the first target electrode piece is cached.
- the detection length of the electrode pieces in the electrode assemblies other than the electrode assembly with the largest diameter can be increased, so that the use lengths of the electrode pieces from the same material roll in multiple electrode assemblies are closer, thereby reducing the adverse effects of unstable factors on the synchronously wound electrode assemblies, reducing the probability of downtime of the synchronous winding device, and improving the production speed of the electrode assemblies.
- caching the first target pole piece includes: caching a pole segment of a first length of the first target pole piece, wherein the difference between the detected length of the first target pole piece and the detected length of the reference pole piece.
- the method 400 for synchronously winding an electrode assembly further includes: when a tension adjustment subcomponent corresponding to a first target pole piece is in a limited state, caching a pole segment of a second length of a second target pole piece among a plurality of pole pieces 210a-210b, wherein the tension adjustment subcomponent is used to adjust the tension of the corresponding pole piece; the second target pole piece is a pole piece corresponding to the tension adjustment subcomponent in a non-limited state; and when the second target pole piece is cached, cutting off a plurality of pole pieces.
- the second length is determined according to a variation range of the pole piece length corresponding to the tension adjustment subcomponent.
- the second length is one third to two thirds of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the second length is half of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the second length is determined based on the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the method further includes: determining the cutting length of the corresponding anode pole piece based on the cache length of the cathode pole piece corresponding to the tension adjustment subcomponent in the limited state.
- the cut-off length of the anode pole piece is determined by the buffer length of the cathode pole piece, the standard length of the anode pole piece, and the difference between the detection lengths of different anode pole pieces.
- the cut-off length of the anode pole piece is equal to the sum of the buffer length of the cathode pole piece, the standard length of the anode pole piece and the difference between N times the detection lengths between different anode pole pieces.
- the difference between the detection length of the first target pole piece and the detection length of the reference pole piece is greater than a preset value.
- the preset value is between 1 mm and 2 mm.
- caching the first target pole piece includes: caching the first target pole piece when the detected length of the first target pole piece meets a preset length, wherein the preset length is determined based on standard lengths of multiple pole pieces.
- Fig. 16 shows a block diagram of another synchronously wound electrode assembly device provided by an embodiment of the present application.
- the synchronously wound electrode assembly device 600 includes: a determination module 610, the determination module 610 is used to determine the first target electrode piece among the multiple synchronously wound electrode pieces, the first target electrode piece is the electrode piece other than the reference electrode piece among the multiple electrode pieces, and the reference electrode piece is the electrode piece with the longest detection length among the multiple electrode pieces; a cache module 620, the cache module 620 is used to cache the first target electrode piece; and a cutting module 630, the cutting module 630 is used to cut off the multiple electrode pieces when the first target electrode piece is cached.
- the cache module 620 is also used to cache a pole segment of a first length of a first target pole piece, wherein the difference between the detected length of the first target pole piece and the detected length of the reference pole piece.
- the cache module 620 is also used to cache a pole segment of a second length of a second target pole piece among multiple pole pieces 210a-210b when the tension adjustment subcomponent corresponding to the first target pole piece is in a limited state, wherein the tension adjustment subcomponent is used to adjust the tension of the corresponding pole piece; the second target pole piece is a pole piece corresponding to the tension adjustment subcomponent in a non-limited state; and when the second target pole piece is cached, multiple pole pieces are cut off.
- the determination module 610 is further configured to determine the second length according to a range of variation of the pole piece length corresponding to the tension adjustment subcomponent.
- the determination module 610 is further configured to determine the second length according to one third to two thirds of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the determination module 610 is further configured to determine the second length according to half of the maximum pole piece length variation corresponding to the tension adjustment subcomponent.
- the second length is determined based on the minimum value of the pole piece lengths corresponding to the multiple tension adjustment subcomponents in the limited state.
- the determination module 610 is also used to determine the cutting length of the corresponding anode pole piece according to the cache length of the cathode pole piece corresponding to the tension adjustment subcomponent in the limited state, when the pole piece corresponding to the tension adjustment subcomponent in the limited state is the cathode pole piece.
- the determination module 610 is further used to determine the cut-off length of the anode pole piece based on the difference between the cache length of the cathode pole piece, the standard length of the anode pole piece and the detection lengths between different anode pole pieces.
- the cut-off length of the anode pole piece is equal to the sum of the buffer length of the cathode pole piece, the standard length of the anode pole piece and the difference between N times the detection lengths between different anode pole pieces.
- the difference between the detection length of the first target pole piece and the detection length of the reference pole piece is greater than a preset value.
- the preset value is between 1 mm and 2 mm.
- the cache module 620 is also used to cache the first target pole piece when the detection length of the first target pole piece meets a preset length, wherein the preset length is determined based on standard lengths of multiple pole pieces.
- An embodiment of the present application also provides a computer-readable storage medium, including a computer program, which, when executed on a computer, enables the computer to execute instructions for the steps in the above-mentioned method for synchronously winding an electrode assembly.
- the computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.
Landscapes
- Secondary Cells (AREA)
Abstract
Description
La=L1;Lb=L1+Z1;
Lc=L2+Z1+M1×Z2;Ld=L2+Z1+M2×Z2;
Ld=L2+Z1+M1×Z3;Lc=L2+Z1+M2×Z3;
Lb=L1;La=L1+Z4;
Lc=L2+Z1+M1×Z2;Ld=L2+Z1+M2×Z2;
Ld=L2+Z1+M1×Z3;Lc=L2+Z1+M2×Z3;
La=L1-Z1;Lb=L1;
Lc=L2+M1×Z2;Ld=L2+M2×Z2;
Ld=L2+M1×Z3;Lc=L2+M2×Z3;
Lb=L1-Z4;La=L1;
Lc=L2+M1×Z2;Ld=L2+M2×Z2;
Ld=L2+M1×Z3;Lc=L2+M2×Z3;
Claims (33)
- 一种同步卷绕电极组件的装置,其特征在于,所述装置包括卷绕部件、切断部件和缓存部件:其中,所述缓存部件位于所述切断部件和所述卷绕部件之间;所述卷绕部件用于同步卷绕多个极片;所述缓存部件用于对所述多个极片中的第一目标极片进行缓存,其中,所述第一目标极片为所述多个极片中除参考极片以外的极片,所述参考极片为所述多个极片中具有最长的检测长度的极片;所述切断部件用于在所述第一目标极片被缓存的情况下,切断所述多个极片。
- 根据权利要求1所述的装置,其特征在于,所述缓存部件用于缓存所述第一目标极片的第一长度的极片段,其中,所述第一长度为所述第一目标极片的检测长度与所述参考极片的检测长度的差值。
- 根据权利要求1或2所述的装置,其特征在于,所述装置还包括:张力调节部件,所述张力调节部件用于调节所述多个极片的张力;其中,所述张力调节部件位于所述切断部件的上游。
- 根据权利要求3所述的装置,其特征在于,所述张力调节部件包括与所述多个极片对应的多个张力调节子部件,其中,每个张力调节子部件用于调节对应的极片的张力。
- 根据权利要求4所述的装置,其特征在于,在所述第一目标极片对应的张力调节子部件处于限位状态的情况下,所述缓存部件用于缓存第二目标极片的第二长度的极片段,所述第二目标极片为处于非限位状态的张力调节子部件对应的极片。
- 根据权利要求5所述的装置,其特征在于,所述第二长度是根据所述张力调节子部件对应的极片长度变化范围确定的。
- 根据权利要求6所述的装置,其特征在于,所述第二长度为所述张力调节子部件对应的最大极片长度变化量的三分之一至三分至二。
- 根据权利要求6或7所述的装置,其特征在于,所述第二长度为所述张力调节子部件对应的最大极片长度变化量的一半。
- 根据权利要求5所述的装置,其特征在于,在多个所述第一目标极片对应的张力调节子部件处于限位状态的情况下,所述第二长度是根据多个处于限位状态的张力调节子部件对应的极片长度的最小值确定的。
- 根据权利要求5至9中任一项所述的装置,其特征在于,在处于限位状态的张力调节子部件对应的极片为阴极极片的情况下,所述切断部件还用于:基于阳极极片的切断长度,切断对应的阳极极片,所述阳极极片的切断长度是基于处于所述限位状态的张力调节子部件对应的阴极极片的缓存长度确定的。
- 根据权利要求10所述的装置,其特征在于,所述阳极极片的切断长度是由所述阴极极片的缓存长度、阳极极片的标准长度和不同的阳极极片之间的检测长度的差值确定的。
- 根据权利要求10或11所述的装置,其特征在于,所述阳极极片的切断长度等于所述阴极极片的缓存长度、阳极极片的标准长度和N倍的不同的阳极极片之间的检测长度的差值之和。
- 根据权利要求1至12中任一项所述的装置,其特征在于,所述缓存部件包括与所述多个极片对应的多个缓存子部件;其中,每个缓存子部件用于缓存对应的极片。
- 根据权利要求13所述的装置,其特征在于,所述每个缓存子部件包括多个定辊和多个动辊,所述多个定辊和所述多个动辊分别位于极片的两侧,所述多个动辊中的至少一个动辊朝向所述多个定辊的一侧移动,以缓存对应的极片的极片段,所述多个定辊的数量大于或者等于所述多个动辊的数量。
- 根据权利要求13所述的装置,其特征在于,所述每个缓存子部件包括压花辊,所述压花辊用于在对应的极片上设置凸点,以缓存所述极片的极片段。
- 根据权利要求4至15中任一项所述的装置,其特征在于,所述每个张力调节子部件包括两个定辊、以及分别位于所述两个定辊连线两侧的动辊;其中,所述每个张力子部件在处于限位状态的情况下,沿垂直于所述连线的方向,所述定辊与所述动辊之间的距离位于预设范围内。
- 根据权利要求1至16中任一项所述的装置,其特征在于,所述第一目标极片的检测长度与所述参考极片的检测长度的差值大于预设值。
- 根据权利要求17所述的装置,其特征在于,所述预设值位于1mm至2mm之间。
- 根据权利要求1至18中任一项所述的装置,其特征在于,所述缓存部件还用于在所述第一目标极片的检测长度满足预设长度的情况下,对所述第一目标极片进行缓存,其中,所述预设长度是根据所述多个极片的标准长度确定的。
- 一种同步卷绕电极组件的方法,其特征在于,所述方法包括:确定同步卷绕的多个极片中的第一目标极片,所述第一目标极片为所述多个极片中除参考极片以外的极片,所述参考极片为所述多个极片中具有最长的检测长度的极片;缓存所述第一目标极片;在所述第一目标极片被缓存的情况下,切断所述多个极片。
- 根据权利要求20所述的方法,其特征在于,所述缓存所述第一目标极片,包括:缓存所述第一目标极片的第一长度的极片段,其中,所述第一长度为所述第一目标极片的检测长度与所述参考极片的检测长度的差值。
- 根据权利要求20或21所述的方法,其特征在于,所述方法还包括:在所述第一目标极片对应的张力调节子部件处于限位状态的情况下,缓存所述多个极片中的第二目标极片的第二长度的极片段,其中,所述张力调节子部件用于调节对应的极片的张力;所述第二目标极片为处于非限位状态的张力调节子部件对应的极片;在所述第二目标极片被缓存的情况下,切断所述多个极片。
- 根据权利要求22所述的方法,其特征在于,所述第二长度是根据所述张力调节子部件对应的极片长度变化范围确定的。
- 根据权利要求23所述的方法,其特征在于,所述第二长度为所述张力调节子部件对应的最大极片长度变化量的三分之一至三分之二。
- 根据权利要求23或24所述的方法,其特征在于,所述第二长度为所述张力调节子部件对应的最大极片长度变化量的一半。
- 根据权利要求22所述的方法,其特征在于,在多个所述第一目标极片对应的张力调节子部件处于限位状态的情况下,所述第二长度是根据多个处于限位状态的张力调节子部件对应的极片长度的最小值确定的。
- 根据权利要求22至26中任一项所述的方法,其特征在于,在处于限位状态的张力调节子部件对应的极片为阴极极片的情况下,所述方法还包括:根据所述限位状态的张力调节子部件对应的阴极极片的缓存长度,确定对应的阳极极片的切断长度。
- 根据权利要求27所述的方法,其特征在于,所述阳极极片的切断长度是由所述阴极极片的缓存长度、阳极极片的标准长度和不同的阳极极片之间的检测长度的差值确定的。
- 根据权利要求28所述的方法,其特征在于,所述阳极极片的切断长度等于所述阴极极片的缓存长度、阳极极片的标准长度和N倍的不同的阳极极片之间的检测长度的差值之和。
- 根据权利要求20至29中任一项所述的方法,其特征在于,所述第一目标极片的检测长度与所述参考极片的检测长度的差值大于预设值。31.根据权利要求30所述的方法,其特征在于,所述预设值位于1mm至2mm之间。
- 根据权利要求20至31中任一项所述的方法,其特征在于,所述缓存所述第一目标极片,包括:在所述第一目标极片的检测长度满足预设长度的情况下,缓存所述第一目标极片,其中,所述预设长度是根据所述多个极片的标准长度确定的。
- 一种同步卷绕电极组件的装置,其特征在于,所述装置包括:确定模块,所述确定模块用于确定同步卷绕的多个极片中的第一目标极片,所述第一目标极片为所述多个极片中除参考极片以外的极片,所述参考极片为所述多个极片中具有最长的检测长度的极片;缓存模块,所述缓存模块用于缓存所述第一目标极片;切断模块,所述切断模块用于在所述第一目标极片被缓存的情况下,切断所述多个极片。
- 一种计算机可读存储介质,其特征在于,包括计算机程序,当所述计算机程序在计算机上运行时,使得所述计算机执行权利要求20至32中任一项所述的同步卷绕电极组件的方法。
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| PCT/CN2023/095337 WO2024239153A1 (zh) | 2023-05-19 | 2023-05-19 | 同步卷绕电极组件的装置及其方法、计算机存储介质 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110010928A1 (en) * | 2008-08-28 | 2011-01-20 | Kenji Tsuchiya | Method and apparatus for producing wound electrode assembly, and method for producing battery |
| CN108808115A (zh) * | 2018-06-01 | 2018-11-13 | 深圳市诚捷智能装备股份有限公司 | 电芯卷绕机 |
| CN208352464U (zh) * | 2018-06-05 | 2019-01-08 | 东莞塔菲尔新能源科技有限公司 | 一种智能模切卷绕一体机 |
| CN110112472A (zh) * | 2019-05-24 | 2019-08-09 | 东莞泓宇智能装备有限公司 | 一种锂离子电芯卷绕生产工艺及制片卷绕一体机 |
| CN114865104A (zh) * | 2022-04-29 | 2022-08-05 | 广东利元亨智能装备股份有限公司 | 极片自动接带方法、装置、控制器以及存储介质 |
| CN115882036A (zh) * | 2022-12-30 | 2023-03-31 | 广东利元亨智能装备股份有限公司 | 切卷缓存稳定控制方法和装置 |
-
2023
- 2023-05-19 CN CN202380059477.4A patent/CN119678288A/zh active Pending
- 2023-05-19 WO PCT/CN2023/095337 patent/WO2024239153A1/zh not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110010928A1 (en) * | 2008-08-28 | 2011-01-20 | Kenji Tsuchiya | Method and apparatus for producing wound electrode assembly, and method for producing battery |
| CN108808115A (zh) * | 2018-06-01 | 2018-11-13 | 深圳市诚捷智能装备股份有限公司 | 电芯卷绕机 |
| CN208352464U (zh) * | 2018-06-05 | 2019-01-08 | 东莞塔菲尔新能源科技有限公司 | 一种智能模切卷绕一体机 |
| CN110112472A (zh) * | 2019-05-24 | 2019-08-09 | 东莞泓宇智能装备有限公司 | 一种锂离子电芯卷绕生产工艺及制片卷绕一体机 |
| CN114865104A (zh) * | 2022-04-29 | 2022-08-05 | 广东利元亨智能装备股份有限公司 | 极片自动接带方法、装置、控制器以及存储介质 |
| CN115882036A (zh) * | 2022-12-30 | 2023-03-31 | 广东利元亨智能装备股份有限公司 | 切卷缓存稳定控制方法和装置 |
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