Slitting structure of dry-coated negative electrode sheet, nickel-hydrogen battery and preparation method thereof

Abstract

The application provides a slitting structure of a dry-coated negative electrode sheet, a nickel-hydrogen battery and a preparation method thereof. The slitting structure of the dry-coated negative electrode sheet comprises a dry-coated negative electrode roll, a sleeve and a cutting position buffer sleeve ring. The dry-coated negative electrode roll comprises at least two slitting negative electrode sheets, and the end portions of the at least two slitting negative electrode sheets are connected. The sleeve is arranged on the outer periphery of each slitting negative electrode sheet. The cutting position buffer sleeve ring is sleeved on the connection position of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the sleeve is clamped between the cutting position buffer sleeve ring and the corresponding slitting negative electrode sheet. The slitting structure of the dry-coated negative electrode sheet can effectively reduce the problem of powder falling of the negative electrode of the nickel-hydrogen battery while ensuring the battery capacity of the nickel-hydrogen battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a slitting structure based on dry powder coated negative plate, nickel-hydrogen battery and preparation method thereof. BACKGROUND

[0002] Due to the fact that fossil fuels are less and less in the case of large-scale development and utilization by human beings, in recent years, the development and utilization of hydrogen energy have been increasingly valued, and nickel-hydrogen batteries as an important direction of hydrogen energy application have been increasingly noticed by people.

[0003] The nickel-hydrogen battery is a good performance storage battery, the negative active material used in the nickel-hydrogen battery is metal hydride, also known as hydrogen storage alloy, and the traditional processing method of the negative electrode plate is divided into two kinds, which are wet electrode technology and dry electrode technology. Since the solvent and the binder are used in the wet electrode technology to form a bonding layer to coat the negative active material on the negative current collector, the negative electrode has poor conductivity, and the residual solvent in the negative electrode will have a side reaction with the electrolyte, affecting the performance of the nickel-hydrogen battery, such as capacity reduction, generation of residual gas and service life attenuation, etc. Therefore, the dry electrode technology is more commonly used at present. The dry electrode technology has simple process, no solvent and good performance of the nickel-hydrogen battery, but the dry coating layer in the negative electrode of the dry electrode technology is easy to fall off from the current collector, that is, the powder falling problem of the negative electrode is serious, especially when the negative electrode roll is cut, please refer to Figure 7 , the impact stress caused by the cutter a will aggravate the falling of the dry coating layer on the current collector, affecting the processing quality of the battery. For example, the Chinese invention patent with application number 201410039754.8 sprays polytetrafluoroethylene emulsion on the surface of the negative electrode to form a firm three-dimensional network, so that the dry coating layer on the surface of the current collector is not easy to fall off, but this still causes the capacity reduction of the nickel-hydrogen battery. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art, and to provide a slitting structure based on dry powder coated negative plate, nickel-hydrogen battery and preparation method thereof, which can effectively reduce the powder falling problem of the negative electrode of the nickel-hydrogen battery while ensuring the battery capacity of the nickel-hydrogen battery.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A slitting structure based on dry powder coated negative plate, comprising:

[0007] A dry powder coated negative roll, the dry powder coated negative roll comprises at least two slitting negative plates, and the end portions of the at least two slitting negative plates are connected;

[0008] A sleeve, the sleeve is arranged around the outer periphery of each slitting negative plate.

[0009] A cutting position buffer sleeve is sleeved at the joint of the slitting negative plate and another adjacent slitting negative plate, and the sheath clamp is arranged between the cutting position buffer sleeve and the corresponding slitting negative plate.

[0010] In one embodiment, the cutting position buffer sleeve comprises an elastic buffer sleeve and a cutting length body, two ends of the cutting length body are connected with the elastic buffer sleeve, the length of the cutting length body is greater than or equal to the width of the slitting negative plate, the extension direction of the cutting length body is the same as the width direction of the slitting negative plate, the elastic buffer sleeve of the cutting position buffer sleeve is sleeved at the joint of the slitting negative plate and another adjacent slitting negative plate, the sheath clamp is arranged between the elastic buffer sleeve of the cutting position buffer sleeve and the corresponding slitting negative plate, and the cutting length body of the cutting position buffer sleeve is located on the same side of the dry powder coating negative roll.

[0011] In one embodiment, the elastic buffer sleeve is a latex ring or a rubber ring.

[0012] In one embodiment, the sheath comprises a film and an adhesive body, the extension directions of the film and the adhesive body are the same as the extension direction of the slitting negative plate, the adhesive body is adhered to the side of the film, the adhesive body is located at the circumference of the film, the film is arranged around the outer circumference of each slitting negative plate, and the film is at least partially overlapped on the adhesive body.

[0013] In one embodiment, the film is a PE film, a PVC film or a PVDC film.

[0014] A preparation method of a nickel-hydrogen battery based on a dry powder coating negative plate, comprising the following steps:

[0015] Obtaining the slitting structure based on the dry powder coating negative plate according to any one of the above embodiments;

[0016] Performing a slitting operation on the slitting structure based on the dry powder coating negative plate, so that the cutting knife is cut at the cutting position buffer sleeve, to obtain at least two slitting negative plates;

[0017] Performing a film peeling operation on each slitting negative plate to remove the sheath and the cutting position buffer sleeve, to obtain a negative plate;

[0018] Performing an assembly process on the negative plate, so that the negative plate, the separator and the positive plate are stacked to form an inner core;

[0019] Performing a post-processing operation on the inner core to obtain a nickel-hydrogen battery.

[0020] In one embodiment, the slitting structure of the dry-powder-coated negative electrode sheet is obtained by the following steps:

[0021] A dry-powder-coated negative electrode roll is obtained, which comprises at least two slitting negative electrode sheets, and the end portions of the at least two slitting negative electrode sheets are connected;

[0022] The dry-powder-coated negative electrode roll is wound to make a jacket wound around the outer periphery of each slitting negative electrode sheet, and the extension direction of the jacket is the same as the extension direction of the slitting negative electrode sheet, thereby obtaining a primary negative electrode roll;

[0023] The primary negative electrode roll is sleeved to make the cut-position buffer sleeve sleeved at the connected portion of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the jacket is clamped between the cut-position buffer sleeve and the corresponding slitting negative electrode sheet.

[0024] In one embodiment, the winding operation of the dry-powder-coated negative electrode roll comprises the following steps:

[0025] The jacket is obtained;

[0026] The dry-powder-coated negative electrode roll is subjected to an upper roller treatment to make the dry-powder-coated negative electrode roll linearly transmitted;

[0027] The jacket is subjected to a supporting treatment to make the jacket expanded, and one end portion of the jacket close to the dry-powder-coated negative electrode roll is fixed;

[0028] The jacket after the supporting treatment and the dry-powder-coated negative electrode roll after the upper roller treatment are subjected to a wrapping treatment to make one end of the jacket away from the dry-powder-coated negative electrode roll connected with the free end of the dry-powder-coated negative electrode roll and move together in a direction away from the dry-powder-coated negative electrode roll.

[0029] In one embodiment, the sleeving operation of the primary negative electrode roll comprises the following steps:

[0030] The cut-position buffer sleeve is obtained;

[0031] The cut-position buffer sleeve is subjected to an expanding treatment to make the cut-position buffer sleeve expanded;

[0032] The primary negative electrode roll and the at least two cut-position buffer sleeves are subjected to a sleeving treatment to make the primary negative electrode roll pass through the cut-position buffer sleeve, and the cut-position buffer sleeve is released at the connected portion of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet.

[0033] A nickel-hydrogen battery based on a dry-coated negative electrode sheet is prepared by the preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet in any of the above embodiments.

[0034] Compared with the prior art, the present application has at least the following advantages:

[0035] The slitting structure of the dry-coated negative electrode sheet of the present application adopts a dry-coated negative electrode roll, which better ensures the battery capacity of the nickel-hydrogen battery, further makes the sleeve wrap set on the outer periphery of each slitting negative electrode sheet, and the cutting position buffer sleeve ring is sleeved at the connection between the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the sleeve is clamped between the cutting position buffer sleeve ring and the corresponding slitting negative electrode sheet, that is, the cutting position buffer sleeve ring and the sleeve protect the punching position of the dry-coated negative electrode roll, that is, the sleeve plays a role of isolation and protection for the dry-coated negative electrode roll, and the sleeve also plays a role of strengthening the adhesion strength of the dry-coated powder layer on the negative current collector, effectively reducing the problem of cracking or falling of the dry-coated powder layer caused by bumping and bending of the dry-coated negative electrode roll during processing, and further making the cutting position buffer sleeve ring strengthen the buffering and fixing effect on the connection between the two slitting negative electrode sheets, the buffering plays a role of buffering and weakening the impact strength of the cutting knife punching the connection between the two slitting negative electrode sheets, thereby reducing the impact stress of the cutting knife punching on the connection between the two slitting negative electrode sheets, thereby further effectively reducing the problem of dry-coated powder layer falling, and the cutting position buffer sleeve ring also plays a role of improving the setting stability of the sleeve on the dry-coated negative electrode roll, thereby further effectively reducing the relative movement between the sleeve and the dry-coated powder layer, that is, reducing the wear of the sleeve on the dry-coated powder layer on the negative current collector, thereby effectively further ensuring the reduction of the problem of dry-coated powder layer falling while ensuring the battery capacity of the nickel-hydrogen battery. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 The structure diagram of the slitting structure of the dry-coated negative electrode sheet of an embodiment of the present application is shown in the figure.

[0038] Figure 2 The structure diagram of the slitting structure of the dry-coated negative electrode sheet of an embodiment of the present application is shown in the figure. Figure 1

[0039] Figure 3 The structure diagram of the slitting structure of the dry-coated negative electrode sheet of an embodiment of the present application is shown in the figure.​Figure 1 Another partial view of the slitting structure of the dry powder coated negative electrode sheet is shown;

[0040] Figure 4 For Figure 3 A partial view of the slitting structure of the dry powder coated negative electrode sheet is shown;

[0041] Figure 5 A flow chart of the preparation method of the nickel-hydrogen battery based on the dry powder coated negative electrode sheet according to an embodiment of the present application is shown;

[0042] Figure 6 A partial view of the package according to an embodiment of the present application is shown;

[0043] Figure 7 A partial view of the equipment used in the dry electrode technology in the background art is shown. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present application, a more complete description of the present application will be provided below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] The present application provides a slitting structure of a dry powder coated negative electrode sheet. The slitting structure of the dry powder coated negative electrode sheet includes a dry powder coated negative electrode roll, a package, and a cutting position buffer sleeve. The dry powder coated negative electrode roll includes at least two slitting negative electrode sheets, and the end portions of the at least two slitting negative electrode sheets are connected. The package is arranged around the outer periphery of each slitting negative electrode sheet. The cutting position buffer sleeve is sleeved at the connection between the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the package is clamped between the cutting position buffer sleeve and the corresponding slitting negative electrode sheet.

[0048] The slitting structure of the dry-coated negative electrode sheet based on the above, adopts the dry-coated negative roll, that is, better ensures the battery capacity of the nickel-hydrogen battery, further makes the sleeve wrap set on the outer periphery of each slitting negative electrode sheet, and the cutting position buffer sleeve is sleeved at the connecting position of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the sleeve is clamped between the cutting position buffer sleeve and the corresponding slitting negative electrode sheet, that is, the cutting position buffer sleeve and the sleeve protect the punching position of the dry-coated negative roll, that is, the sleeve plays a role of isolation and protection for the dry-coated negative roll, and the sleeve also plays a role of strengthening the adhesion strength of the dry-coated powder layer on the negative current collector, effectively reducing the problem of cracking or falling of the dry-coated powder layer caused by bumping and bending of the dry-coated negative roll during processing, and further making the cutting position buffer sleeve strengthen the buffering and fixing effect on the connecting position of the two slitting negative electrode sheets, buffering, that is, buffering and weakening the impact strength of the cutting knife punching the connecting position of the two slitting negative electrode sheets, thereby reducing the impact stress of the cutting knife punching on the connecting position of the slitting negative electrode sheet, thereby further effectively reducing the problem of dry-coated powder layer falling, and the cutting position buffer sleeve also plays a role of improving the setting stability of the sleeve on the dry-coated negative roll, thereby further effectively reducing the relative movement between the sleeve and the dry-coated powder layer, that is, reducing the wear of the sleeve on the dry-coated powder layer on the negative current collector, thereby effectively further ensuring the reduction of the problem of dry-coated powder layer falling while ensuring the battery capacity of the nickel-hydrogen battery.

[0049] In order to better understand the slitting structure of the dry-coated negative electrode sheet based on the application, the slitting structure of the dry-coated negative electrode sheet based on the application is further explained as follows:

[0050] Please refer to Figures 1 to 2 The slitting structure 10 of the dry-coated negative electrode sheet based on an embodiment includes a dry-coated negative roll 100, a sleeve 200, and a cutting position buffer sleeve 300. The dry-coated negative roll 100 includes at least two slitting negative electrode sheets 110, and the end portions of the at least two slitting negative electrode sheets 110 are connected. The sleeve 200 is wrapped around the outer periphery of each slitting negative electrode sheet 110. The cutting position buffer sleeve 300 is sleeved at the connecting position of the slitting negative electrode sheet 110 and another adjacent slitting negative electrode sheet 110, and the sleeve 200 is clamped between the cutting position buffer sleeve 300 and the corresponding slitting negative electrode sheet 110.

[0051] The slitting structure 10 based on the dry-coated negative plate described above adopts the dry-coated negative roll 100, which can better ensure the battery capacity of the nickel-hydrogen battery, and further make the sheath 200 wrap around the outer periphery of each slitting negative plate 110, and the cutting position buffer sleeve ring 300 is sleeved at the connecting position of the slitting negative plate 110 and another adjacent slitting negative plate 110, and the sheath 200 is clamped between the cutting position buffer sleeve ring 300 and the corresponding slitting negative plate 110, that is, the cutting position buffer sleeve ring 300 and the sheath 200 protect the punching position of the dry-coated negative roll 100, that is, the sheath 200 preliminarily plays a role of isolation and protection for the dry-coated negative roll 100, and the sheath 200 also plays a role of strengthening the adhesion strength of the dry-coated layer on the negative current collector for the dry-coated negative roll 100, effectively reducing the problem of cracking or falling of the dry-coated layer of the dry-coated negative roll 100 caused by bumping and bending during processing, and further making the cutting position buffer sleeve ring 300 strengthen the buffering and fixing effect on the connecting position of the two slitting negative plates 110, the buffering is to weaken the impact strength of the cutting knife cutting the connecting position of the two slitting negative plates 110, thereby reducing the impact stress of the cutting knife cutting on the connecting position of the slitting negative plate 110, thereby further effectively reducing the problem of dry-coated layer falling, and the cutting position buffer sleeve ring 300 also plays a role of improving the setting stability of the sheath 200 on the dry-coated negative roll 100, thereby further effectively reducing the relative movement between the sheath 200 and the dry-coated layer, that is, reducing the wear of the dry-coated layer on the negative current collector by the sheath 200, thereby effectively further ensuring the reduction of the problem of dry-coated layer falling while ensuring the battery capacity of the nickel-hydrogen battery.

[0052] Please refer to Figures 1 to 2 In one embodiment, the extension direction of the sheath 200 is the same as the extension direction of the slitting negative plate 110, which is conducive to the wrapping of the sheath 200 on each slitting negative plate 110, that is, conducive to the processing of the slitting structure 10 based on the dry-coated negative plate.

[0053] Please refer to Figures 2 to 4In one of the embodiments, the cutting position buffer sleeve 300 comprises an elastic buffer sleeve 310 and a cutting lengthener 320, two ends of the cutting lengthener 320 are connected with the elastic buffer sleeve 310, the length of the cutting lengthener 320 is greater than or equal to the width of the slitting negative plate 110, the extension direction of the cutting lengthener 320 is the same as the width direction of the slitting negative plate 110, the elastic buffer sleeve 310 of the cutting position buffer sleeve 300 is sleeved at the joint of the slitting negative plate 110 and another adjacent slitting negative plate 110, the sleeve 200 is clamped between the elastic buffer sleeve 310 of the cutting position buffer sleeve 300 and the corresponding slitting negative plate 110, and the cutting lengthener 320 of the cutting position buffer sleeve 300 is located on the same side of the dry-coated negative roll 100. It can be understood that if the sleeve 200 is directly bonded on the slitting negative plate 110, when the sleeve 200 is removed, the sleeve 200 will tear the dry-coated layer on the slitting negative plate 110, that is, it will exacerbate the dry-coated layer from the current collector. Therefore, the application uses the elastic buffer sleeve 310 to limit the position of the sleeve 200, and if the elastic buffer sleeve 310 is sleeved on the width of the slitting negative plate 110, in order to ensure the limiting effect of the elastic buffer sleeve 310 on the position of the sleeve 200, that is, to increase the stable positioning of the sleeve 200 on the slitting negative plate 110, to reduce the relative movement between the sleeve 200 and the slitting negative plate 110 to reduce the influence of the sleeve 200 on the dry-coated layer on the slitting negative plate 110, the cutting position buffer sleeve 300 needs to be tightly sleeved on the slitting negative plate 110, which will cause the slitting negative plate 110 to be locally forced to receive a bending or crimping force, and further exacerbate the powder falling of the slitting negative plate 110 corresponding to the elastic buffer sleeve 310. In order to effectively reduce the problem of powder falling of the slitting negative plate 110, in the application, the length of the cutting lengthener 320 is greater than or equal to the width of the slitting negative plate 110, and the extension direction of the cutting lengthener 320 is the same as the width direction of the slitting negative plate 110, so that the cutting lengthener 320 bears the bending or crimping force of the slitting negative plate 110 generated by the elastic buffer sleeve 310, and the elastic buffer sleeve 310 generates a clamping force on both sides of the slitting negative plate 110, thereby effectively reducing the problem of powder falling of the slitting negative plate 110 and achieving stable positioning and fixing of the sleeve 200 on the slitting negative plate 110.

[0054] In one of the embodiments, the length of the cutting lengthener is greater than 3mm-10mm of the width of the slitting negative plate, which further effectively reduces the problem of powder falling of the slitting negative plate and achieves stable positioning and fixing of the sleeve on the slitting negative plate.

[0055] Please refer to Figures 2 to 4In one of the embodiments, the cutting length body 320 is at least partially embedded in the elastic buffer ring 310, effectively improving the stability and compactness of the connection between the cutting length body 320 and the elastic buffer ring 310, and further better ensuring the structural stability and compactness of the cutting position buffer ring 300, which is conducive to improving the stability of the limiting and fixing of the sheath 200 on the slitting negative plate 110.

[0056] Please refer to Figures 2 to 4 In one of the embodiments, the two ends of the cutting length body 320 are embedded in the elastic buffer ring 310, and the cutting length body 320 is located on the side of the elastic buffer ring 310 away from the sheath 200, which reduces the mechanical interference between the cutter and the cutting length body 320, and better ensures the buffering effect of the elastic buffer ring 310 on the impact stress of the cutter on the slitting negative plate 110, thereby better ensuring the reduction of the problem of powder falling of the slitting negative plate.

[0057] Please refer to Figures 2 to 4 In one of the embodiments, the two ends of the cutting length body 320 are in interference connection with the elastic buffer ring 310, which is conducive to the recycling and recycling of the cutting length body 320.

[0058] Please refer to Figures 2 to 4 In one of the embodiments, the cutting length body 320 includes a first length part 321, a connecting part 322, and a second length part 3233, the connecting part 322 is connected to the first length part 321 and / or the second length part 3233, the first length part 321 is detachably connected to the second length part 3233 through the connecting part 322, the first length part 321 and the second length part 3233 are both connected to the elastic buffer ring 310, and the extension directions of the first length part 321 and the second length part 3233 are both the same as the circumferential direction of the elastic buffer ring 310. It should be noted that the first length part 321 and the second length part 3233 are both located on the side of the elastic buffer ring 310 away from the sheath 200; or, the first length part 321 and the second length part 3233 are both embedded in the elastic buffer ring 310, which better realizes the quick removal of the cutting position buffer ring 300 on the slitting negative plate 110, and improves the processing efficiency of the nickel-hydrogen battery.

[0059] Please refer to Figures 2 to 4 In one of the embodiments, the connecting part 322 includes a first buckling body 3221 and a second buckling body 3222, the first buckling body 3221 is connected to the first length part 321, the second buckling body 3222 is connected to the second length part 3233, and the first buckling body 3221 and the second buckling body 3222 are detachably buckled, which better ensures the quick removal of the cutting position buffer ring 300 on the slitting negative plate 110.

[0060] In one of the embodiments, the elastic buffer sleeve is a rubber sleeve or a latex sleeve, which preferably ensures the elastic effect of the elastic buffer sleeve, and in turn preferably ensures the stable limitation of the position of the sleeve, and preferably ensures the buffering effect of the elastic buffer sleeve, and in turn preferably reduces the impact stress caused by the cutting knife when cutting the connected part of the cut negative plate, and in turn preferably reduces the problem of powder falling of the cut negative plate.

[0061] In one of the embodiments, the sleeve comprises a film and an adhesive body, the extension directions of the film and the adhesive body are the same as the extension direction of the cut negative plate, the adhesive body is adhered to the side of the film, and the adhesive body is located at the periphery of the film, the film is arranged around the outer periphery of each cut negative plate, and the film is at least partially and movably overlapped on the adhesive body, which is conducive to the tearing of the film on the cut negative plate, and in turn ensures the quick removal of the sleeve on the cut negative plate, and is conducive to the recycling of the sleeve.

[0062] In one of the embodiments, the film is a PE film, a PVC film or a PVDC film. It should be noted that the PE film is a film sheet material mainly composed of polyethylene; the PVC film is a film sheet material mainly composed of polyvinyl chloride; and the PVDC film is a film sheet material mainly composed of a copolymer of vinylidene chloride and vinyl chloride, and methyl acrylate.

[0063] In one of the embodiments, the film is at least partially and movably adhered to the adhesive body. It should be noted that the movable adhesion means that the film can be torn from the adhesive body, and at the same time, the film can be re-adhered to the adhesive body, i.e. the film can be repeatedly adhered to the adhesive body, which is conducive to the tearing of the film on the cut negative plate, and is conducive to the recycling of the sleeve.

[0064] In one of the embodiments, the adhesive body is a double-sided adhesive tape. It should be noted that the double-sided adhesive tape is a conventional double-sided adhesive tape on the market, and the material of the adhesive body is not protected in the present application, only the structural relationship, connection relationship and positional relationship of the adhesive body are protected. It can be understood that the adhesive body is a double-sided adhesive tape, which preferably ensures the recycling of the sleeve, and in turn preferably ensures the reduction of the processing cost of the nickel-hydrogen battery, while ensuring the low pollution of the processing of the nickel-hydrogen battery.

[0065] The application also provides a preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet. The preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet comprises the following steps: obtaining the slitting structure of the dry-coated negative electrode sheet according to any one of the embodiments; performing a slitting operation on the slitting structure of the dry-coated negative electrode sheet, so that the cutting knife is punched at the cutting position buffer sleeve ring to obtain at least two slitting negative electrode sheets; performing a film stripping operation on each slitting negative electrode sheet to remove the package and the cutting position buffer sleeve ring, thereby obtaining a negative electrode sheet; performing an assembly process on the negative electrode sheet to stack the negative electrode sheet, the separator and the positive electrode sheet to form an inner core; and performing a post-processing operation on the inner core to obtain the nickel-hydrogen battery.

[0066] The preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet, which obtains the slitting structure of the dry-coated negative electrode sheet for the preparation of the nickel-hydrogen battery, preferably ensures the battery capacity of the nickel-hydrogen battery, and on this basis, effectively reduces the problem of cracking or peeling of the dry-coated negative electrode sheet caused by bumps and bending during processing of the dry-coated negative electrode sheet, and effectively reduces the problem of peeling of the dry-coated negative electrode sheet caused by slitting during processing, and preferably realizes the preparation of the nickel-hydrogen battery with good electrical properties, such as high capacity, high stability and long service life.

[0067] In order to better understand the preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet of the application, the preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet of the application is further explained as follows:

[0068] Please refer to Figure 5 The preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet of an embodiment comprises the following steps:

[0069] S100, obtaining the slitting structure of the dry-coated negative electrode sheet according to any one of the embodiments. Please also refer to Figures 1 to 2In the embodiment, the slitting structure based on the dry-coated negative electrode sheet comprises a dry-coated negative electrode roll 100, a sheath 200 and a cutting position buffer sleeve 300. The dry-coated negative electrode roll 100 comprises at least two slitting negative electrode sheets 110, and the end portions of the at least two slitting negative electrode sheets 110 are connected. The sheath 200 is arranged around the outer periphery of each slitting negative electrode sheet 110. The cutting position buffer sleeve 300 is sleeved at the connection position of the slitting negative electrode sheet 110 and another adjacent slitting negative electrode sheet 110, and the sheath 200 is clamped between the cutting position buffer sleeve 300 and the corresponding slitting negative electrode sheet 110. It can be understood that the dry-coated negative electrode roll is used in the slitting structure based on the dry-coated negative electrode sheet to prepare the nickel-hydrogen battery based on the dry-coated negative electrode sheet, which preferably ensures the battery capacity of the nickel-hydrogen battery. In addition, since the sheath is arranged around the outer periphery of each slitting negative electrode sheet and is clamped between the cutting position buffer sleeve and the corresponding slitting negative electrode sheet, the sheath preliminarily plays a role of isolation and protection for the dry-coated negative electrode roll, and the sheath also plays a role of strengthening the adhesion strength of the dry-coated powder layer on the negative current collector for the dry-coated negative electrode roll, which effectively reduces the problem of cracking or falling of the dry-coated powder layer caused by bumps and bending of the dry-coated negative electrode roll during processing.

[0070] S200, the slitting structure based on the dry-coated negative electrode sheet is subjected to a slitting operation, so that the cutting knife is punched at the cutting position buffer sleeve to obtain at least two slitting negative electrode sheets. It can be understood that since the cutting position buffer sleeve is sleeved at the connection position of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, when the cutting knife is punched at the cutting position buffer sleeve, the cutting position buffer sleeve plays a buffering role for the connection position of the two slitting negative electrode sheets, that is, the cutting knife weakens the impact strength of the connection position of the two slitting negative electrode sheets, thereby reducing the impact stress of the connection position of the slitting negative electrode sheet caused by the cutting knife, and further effectively reducing the problem of dry-coated powder layer falling.

[0071] S300, the film of each slitting negative electrode sheet is peeled off to remove the sheath and the cutting position buffer sleeve, and a negative electrode sheet is obtained. It can be understood that the sheath and the cutting position buffer sleeve do not belong to the components of the nickel-hydrogen battery, but only assist in the slitting of the negative electrode sheet. Therefore, after the slitting negative electrode sheet is prepared, the sheath and the cutting position buffer sleeve need to be removed, and then the subsequent processing of the nickel-hydrogen battery is carried out.

[0072] S400, the negative electrode sheet is subjected to assembly processing to stack the negative electrode sheet, the separator and the positive electrode sheet to form an inner core. It can be understood that the inner core of the nickel-hydrogen battery is formed by stacking the negative electrode sheet, the separator and the positive electrode sheet, and then the negative electrode sheet is subjected to assembly processing, which preferably ensures the preparation of the nickel-hydrogen battery.

[0073] S500, performing a post-processing operation on the inner core to obtain the nickel-hydrogen battery. It can be understood that the post-processing operation, i.e., casing, liquid injection, packaging and electrical detection of the inner core, preferably ensures the preparation of the nickel-hydrogen battery.

[0074] The above preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet preferably ensures the battery capacity of the nickel-hydrogen battery, and on this basis, effectively reduces the cracking or peeling of the dry-coated negative electrode sheet caused by the dry-coated negative electrode roll bumping and bending during processing, and effectively reduces the dry-coated negative electrode sheet peeling caused by processing slitting, and preferably realizes the preparation of the nickel-hydrogen battery with good electrical performance, such as high capacity, high stability and long service life.

[0075] In one embodiment, the slitting structure based on the dry-coated negative electrode sheet includes the following steps:

[0076] The dry-coated negative electrode roll includes at least two slitting negative electrode sheets, and the end portions of the at least two slitting negative electrode sheets are connected;

[0077] Further, the dry-coated negative electrode roll is wound to have the sheath wound around the outer periphery of each slitting negative electrode sheet, and the extension direction of the sheath is the same as the extension direction of the slitting negative electrode sheet, to obtain a primary negative electrode roll;

[0078] Further, the primary negative electrode roll is sleeved to have the cut-off position buffer sleeve sleeved at the connection between the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the sheath is clamped between the cut-off position buffer sleeve and the corresponding slitting negative electrode sheet.

[0079] It can be understood that the sheath is wound around the outer periphery of each slitting negative electrode sheet, and the extension direction of the sheath is the same as the extension direction of the slitting negative electrode sheet, which is conducive to quickly realizing the sheath wound around each slitting negative electrode sheet. Further, after the sheath is wound on the slitting negative electrode sheet, the primary negative electrode roll is sleeved, which is conducive to quickly realizing the cut-off position buffer sleeve sleeved and clamped between the cut-off position buffer sleeve and the corresponding slitting negative electrode sheet.

[0080] In one embodiment, the dry-coated negative electrode roll is wound, including the following steps:

[0081] The sheath is obtained, please refer to the sheath in Figure 6

[0082] Further, the dry-coated negative electrode roll is processed by the upper roller to linearly transmit the dry-coated negative electrode roll;

[0083] Further, the sheath is supported to expand, and one end of the sheath close to the dry-coated negative electrode roll is fixed.​

[0084] Further, the support processing of the sleeve and the upper roller processing of the dry-coated negative roll are wrapped to connect the end of the sleeve away from the dry-coated negative roll with the free end of the dry-coated negative roll and move together in the direction away from the dry-coated negative roll.

[0085] It can be understood that the upper roller processing of the dry-coated negative roll, i.e. the dry-coated negative roll is fixed, is beneficial to the movement of the free end of the dry-coated negative roll under the action of external force, and is further beneficial to the winding of the sleeve on the dry-coated negative roll. Then, the support processing of the sleeve, i.e. the sleeve is entirely sleeved on the tool in a tubular shape, specifically, the sleeve is integrally sleeved on the outer wall of the tubular tool, the diameter of the tool is greater than the width of the split negative sheet, and the end of the sleeve close to the dry-coated negative roll is fixed on the tool. In this way, the support processing of the sleeve and the upper roller processing of the dry-coated negative roll are further wrapped, i.e. the dry-coated negative roll is inserted into the tubular tool with the other end of the sleeve, and the sleeve is wrapped on each split negative sheet, which is simple and easy to operate.

[0086] In one of the embodiments, the sleeve connection operation of the primary negative roll includes the following steps:

[0087] Obtaining a cut-off position buffer sleeve ring;

[0088] Expanding the cut-off position buffer sleeve ring to expand the cut-off position buffer sleeve ring;

[0089] Sleeving the primary negative roll and at least two cut-off position buffer sleeve rings to pass the primary negative roll through the cut-off position buffer sleeve ring and release the cut-off position buffer sleeve ring at the connection between the split negative sheet and another adjacent split negative sheet.

[0090] It can be understood that the cut-off position buffer sleeve ring is expanded by using a semicircular tubular tool, so that the cut-off position buffer sleeve ring is sleeved on the semicircular tubular tool. Specifically, the cut-off length body is arranged on the outer wall of the planar tubular tool, and the telescopic buffer sleeve ring is arranged on the outer wall of the arc-shaped tubular tool. The diameter of the tool is greater than the sum of the width of the split negative sheet and the thickness of the sleeve. The split negative sheet is inserted into the semicircular tubular tool, and the cut-off position buffer sleeve ring is released from the semicircular tubular tool when the connection between the split negative sheet and another adjacent split negative sheet is close to the pipe opening of the semicircular tubular tool, i.e. the cut-off position buffer sleeve ring is moved out of the semicircular tubular tool in the direction of the pipe opening until it is completely separated from the tool and sleeved on the connection between the split negative sheet and another adjacent split negative sheet. At this time, the primary negative roll can be in a dynamic moving state without affecting the processing efficiency of the nickel-hydrogen battery, which is simple and easy to operate.

[0091] In one of the embodiments, the film stripping operation is performed on each of the slitting negative plate, including the following steps:

[0092] The debuckling treatment is performed on the slitting negative plate to unfasten the cut-off position buffer sleeve ring on the slitting negative plate and remove it;

[0093] The tearing treatment is performed on the slitting negative plate after the debuckling treatment to tear off the sheath on the slitting negative plate.

[0094] It can be understood that the debuckling treatment is performed on the slitting negative plate, that is, the cut-off position buffer sleeve ring is cut off or the first buckling body and the second buckling body buckled are unfastened, thereby effectively and quickly removing the cut-off position buffer sleeve ring, and further, the tearing treatment is performed on the slitting negative plate after the debuckling treatment, that is, the sheath is torn or the part of the film sheet overlapped on the adhesive body is torn off from the adhesive body, thereby effectively and quickly removing the sheath.

[0095] The application also provides a nickel-hydrogen battery based on the dry-method-powder-coated negative plate. The nickel-hydrogen battery based on the dry-method-powder-coated negative plate is prepared by the preparation method of the nickel-hydrogen battery based on the dry-method-powder-coated negative plate of any one of the embodiments. Further, please refer to Figure 5 In the embodiment, the preparation method of the nickel-hydrogen battery based on the dry-method-powder-coated negative plate includes the following steps: S100, obtaining the slitting structure of the dry-method-powder-coated negative plate of any one of the embodiments; S200, performing the slitting operation on the slitting structure of the dry-method-powder-coated negative plate to make the cutting knife punch at the cut-off position buffer sleeve ring to obtain at least two slitting negative plates; S300, performing the film stripping operation on each of the slitting negative plates to remove the sheath and the cut-off position buffer sleeve ring to obtain the negative plate; S400, performing the assembly treatment on the negative plate to make the negative plate, the diaphragm and the positive plate be stacked to form an inner core; S500, performing the post-treatment operation on the inner core to obtain the nickel-hydrogen battery.

[0096] The nickel-hydrogen battery based on the dry-method-powder-coated negative plate is prepared by the preparation method of the nickel-hydrogen battery based on the dry-method-powder-coated negative plate, thereby effectively ensuring the preparation of the nickel-hydrogen battery with better electrical performance, such as higher capacity, higher stability and longer service life.

[0097] Compared with the prior art, the application has at least the following advantages:

[0098] The slitting structure 10 of the dry-coated negative electrode sheet of the present application adopts the dry-coated negative electrode roll 100, which can better ensure the battery capacity of the nickel-hydrogen battery, and further make the sheath 200 wrap around the outer periphery of each slitting negative electrode sheet 110, and the cutting position buffer sleeve 300 wrap around the joint of the slitting negative electrode sheet 110 and another adjacent slitting negative electrode sheet 110, and the sheath 200 wrap around the cutting position buffer sleeve 300 and the corresponding slitting negative electrode sheet 110, that is, the cutting position buffer sleeve 300 and the sheath 200 protect the punching position of the dry-coated negative electrode roll 100, that is, the sheath 200 preliminarily plays a role of isolation and protection for the dry-coated negative electrode roll 100, and the sheath 200 also plays a role of strengthening the adhesion strength of the dry-coated powder layer on the negative current collector for the dry-coated negative electrode roll 100, effectively reducing the problem of cracking or falling of the dry-coated powder layer of the dry-coated negative electrode roll 100 caused by bumping and bending during processing, and further making the cutting position buffer sleeve 300 strengthen the buffering and fixing effect on the joint of the two slitting negative electrode sheets 110, the buffering plays a role of buffering and weakening the impact strength of the cutting knife on the joint of the two slitting negative electrode sheets 110, thereby reducing the impact stress on the joint of the slitting negative electrode sheet 110 during cutting, thereby further effectively reducing the problem of dry-coated powder layer falling, and the cutting position buffer sleeve 300 also plays a role of improving the setting stability of the sheath 200 on the dry-coated negative electrode roll 100, thereby further effectively reducing the relative movement between the sheath 200 and the dry-coated powder layer, that is, reducing the abrasion of the sheath 200 on the dry-coated powder layer on the negative current collector, thereby effectively further ensuring the reduction of the problem of dry-coated powder layer falling while ensuring the battery capacity of the nickel-hydrogen battery.

[0099] The above-described embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as the limitation of the patent scope of the present application. It should be noted that for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A slitting structure of a dry-powder-based negative electrode sheet, characterized by, The application relates to a dry-coated negative electrode roll, which comprises at least two slitting negative electrode sheets, the ends of the at least two slitting negative electrode sheets being connected; a sheath, the sheath being arranged around the periphery of each slitting negative electrode sheet, and the extension direction of the sheath being the same as the extension direction of the slitting negative electrode sheet; and a cutting position buffer ring, the cutting position buffer ring being arranged at the connecting position of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the sheath being arranged between the cutting position buffer ring and the corresponding slitting negative electrode sheet. The extension direction of the sheath is the same as the extension direction of the slitting negative electrode sheet. The sheath comprises a film and an adhesive body, the extension direction of the film and the adhesive body being the same as the extension direction of the slitting negative electrode sheet, the adhesive body being adhered to the side of the film, and the adhesive body being located at the periphery of the film. The film is a PE film, a PVC film or a PVDC film.

2. The slitting structure of the dry powder-based negative electrode sheet according to claim 1, wherein The application further relates to a method for manufacturing a dry-coated negative electrode roll, which comprises the following steps: obtaining a slitting structure based on a dry-coated negative electrode sheet; performing a slitting operation on the slitting structure based on the dry-coated negative electrode sheet, so that a cutting knife is cut at the cutting position buffer ring, and at least two slitting negative electrode sheets are obtained; performing a film peeling operation on each slitting negative electrode sheet, so that the sheath and the cutting position buffer ring are removed, and a negative electrode sheet is obtained; performing an assembly process on the negative electrode sheet, so that the negative electrode sheet, a separator and a positive electrode sheet are arranged in layers to form an inner core; and performing a post-processing operation on the inner core, so that a nickel-hydrogen battery is obtained.

3. The slitting structure of the dry powder-based negative electrode sheet according to claim 1, wherein The application further relates to a method for manufacturing a dry-coated negative electrode roll, which comprises the following steps: obtaining a dry-coated negative electrode roll, the dry-coated negative electrode roll comprising at least two slitting negative electrode sheets, the ends of the at least two slitting negative electrode sheets being connected; performing a winding operation on the dry-coated negative electrode roll, so that a sheath is arranged around the periphery of each slitting negative electrode sheet, and the extension direction of the sheath is the same as the extension direction of the slitting negative electrode sheet, and a primary negative electrode roll is obtained; and performing a sleeving operation on the primary negative electrode roll, so that a cutting position buffer ring is arranged at the connecting position of the slitting negative electrode sheet and another adjacent slitting negative electrode sheet, and the sheath is arranged between the cutting position buffer ring and the corresponding slitting negative electrode sheet.

4. The slitting structure of the dry powder-based negative electrode sheet according to claim 3, characterized by ​ 5. A method for preparing a nickel-hydrogen battery based on a dry-coated negative electrode sheet, characterized by, ​ ​ ​ ​ ​ ​ 6. The method for preparing the nickel-hydrogen battery based on the dry-coated negative electrode sheet according to claim 5, characterized in that, ​ ​ ​ ​ 7. The method for preparing the nickel-hydrogen battery based on the dry-coated negative electrode sheet according to claim 6, characterized in that, The dry-coated negative electrode roll is subjected to a winding operation, including the following steps: The package is obtained; The dry-coated negative electrode roll is subjected to an upper roller treatment to linearly transfer the dry-coated negative electrode roll; The package is subjected to a supporting treatment to expand the package, and an end of the package close to the dry-coated negative electrode roll is fixed; The package after the supporting treatment and the dry-coated negative electrode roll after the upper roller treatment are subjected to a wrapping treatment, so that an end of the package away from the dry-coated negative electrode roll is connected with a free end of the dry-coated negative electrode roll and moves together in a direction away from the dry-coated negative electrode roll.

8. The method for preparing the nickel-hydrogen battery based on the dry-coated negative electrode sheet according to claim 6, characterized in that, The primary negative electrode roll is subjected to a sleeving operation, including the following steps: The cut-position buffer sleeve ring is obtained; The cut-position buffer sleeve ring is subjected to an expanding treatment to expand the cut-position buffer sleeve ring; The primary negative electrode roll and at least two cut-position buffer sleeve rings are subjected to a sleeving treatment, so that the primary negative electrode roll passes through the cut-position buffer sleeve ring, and the cut-position buffer sleeve ring is released at a connection position of the cut negative electrode sheet and another adjacent cut negative electrode sheet.

9. A nickel-hydrogen battery based on a dry-coated negative electrode sheet, characterized by, The nickel-hydrogen battery based on the dry-coated negative electrode sheet is prepared by the preparation method of the nickel-hydrogen battery based on the dry-coated negative electrode sheet in any one of claims 5 to 8.

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