Battery manufacturing method, battery and rolling processing equipment

Abstract

The invention discloses a battery manufacturing method, a battery and rolling processing equipment, the battery manufacturing method uses the rolling processing equipment to process the battery, the rolling processing equipment comprises an unreeling mechanism used for releasing a pole piece; the unwinding deviation rectifying mechanism is used for rectifying the deviation of the pole piece; the battery manufacturing method comprises the following steps: setting the unwinding deviation correction gradual movement speed of the unwinding deviation correction mechanism to be 0.1 mm / min to 1.5 mm / min. According to the battery manufacturing method, the yield of the pole piece can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery manufacturing method, a battery and rolling processing equipment. Background Art

[0002] In the related art, the pole piece needs to be rolled during the manufacturing process. Rolling the pole piece has the following advantages: 1. The rolling process can keep the surface of the pole piece smooth and flat, thereby preventing the hidden danger of battery short circuit caused by burrs on the surface of the pole piece piercing the diaphragm, ensuring the safety performance of the battery; 2. The rolling process can compact the electrode material coated on the pole piece current collector, reduce the volume of the pole piece, and thus increase the energy density of the battery. In addition, compaction can also reduce the porosity between the active material, conductive agent, and binder inside the pole piece, further reduce the resistance of the battery, and improve the battery performance; 3. After the pole piece is coated and dried, the peel strength between the active material and the current collector foil is very low. Rolling can significantly enhance the bonding strength between them, prevent peeling during electrolyte immersion and battery use, thereby increasing the cycle life of the battery.

[0003] Among them, after long-term rolling, the surface of the roller is worn, which will cause wavy edges to appear on the edges of the pole piece after the roller rolls the pole piece, resulting in a low yield of the pole piece. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery manufacturing method that can effectively improve the yield of pole pieces.

[0005] The invention also provides a battery.

[0006] The invention also provides a rolling processing device.

[0007] According to the battery manufacturing method of the first embodiment of the present invention, a battery is processed using a rolling processing device, and the rolling processing device includes: An unwinding mechanism, used for releasing the pole piece; An unwinding and correcting mechanism, used for correcting the pole piece; The battery manufacturing method comprises the following steps: The unwinding deviation correction gradual moving speed of the unwinding deviation correction mechanism is set to 0.1mm / min~1.5mm / min.

[0008] The battery manufacturing method according to the embodiment of the present invention has at least the following beneficial effects: by setting the unwinding correction gradual shift speed of the unwinding correction mechanism to 0.1mm / min~1.5mm / min, the wavy edge of the pole piece can be effectively reduced, thereby improving the yield of the pole piece. Specifically, when the unwinding correction gradual shift speed of the unwinding correction mechanism is less than 0.1mm / min, this will cause the edge of the pole piece to be more wavy. When the unwinding correction gradual shift speed of the unwinding correction mechanism is greater than 1.5mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual shift speed of the unwinding correction mechanism to between 0.1mm / min~1.5mm / min. Specifically, the battery manufacturing method can effectively improve the yield of the pole piece.

[0009] According to some embodiments of the battery manufacturing method of the present invention, the rolling processing equipment also includes a winding mechanism and a winding correction mechanism, the winding mechanism is used to wind up the pole piece, and the winding correction mechanism is used to correct the pole piece. The battery manufacturing method also includes the following steps: the unwinding and correction reciprocating movement stroke of the unwinding mechanism is within the range of the winding and correction reciprocating movement stroke.

[0010] In the battery manufacturing method according to some embodiments of the present invention, the unwinding and deflection-correcting reciprocating movement stroke of the unwinding mechanism is from -100 mm to 100 mm.

[0011] According to some embodiments of the battery manufacturing method of the present invention, the rolling processing equipment also includes a rolling mechanism, and the rolling mechanism includes a roller. The battery manufacturing method also includes the following steps: detecting the worn area of ​​the roller and using the area of ​​the roller with less wear to roll the pole piece.

[0012] The battery according to the second aspect of the present invention is manufactured by the battery manufacturing method described in any one of the first aspect of the present invention.

[0013] The battery according to the embodiment of the present invention has at least the following beneficial effects: by setting the unwinding correction gradual shift speed of the unwinding correction mechanism to 0.1mm / min~1.5mm / min, the wavy edge of the pole piece can be effectively reduced, thereby improving the yield of the pole piece. Specifically, when the unwinding correction gradual shift speed of the unwinding correction mechanism is less than 0.1mm / min, this will cause the edge of the pole piece to be more wavy. When the unwinding correction gradual shift speed of the unwinding correction mechanism is greater than 1.5mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual shift speed of the unwinding correction mechanism to between 0.1mm / min~1.5mm / min. Specifically, the battery manufacturing method can effectively improve the yield of the pole piece. Furthermore, the yield of the battery manufactured by the battery manufacturing method is also high.

[0014] A rolling processing device according to a third aspect of the present invention includes: An unwinding mechanism, used for releasing the pole piece; An unwinding and correcting mechanism, used for correcting the pole piece; The controller is communicatively connected to the unwinding and correcting mechanism, and the controller is configured to control the unwinding and correcting gradual moving speed of the unwinding and correcting mechanism to be 0.1 mm / min to 1.5 mm / min.

[0015] The rolling processing equipment according to the embodiment of the present invention has at least the following beneficial effects: after the controller controls the unwinding correction mechanism's unwinding correction gradual shift speed to be set to 0.1mm / min~1.5mm / min, the wavy edge of the pole piece can be effectively reduced, thereby improving the yield of the pole piece. Specifically, when the unwinding correction gradual shift speed of the unwinding correction mechanism is less than 0.1mm / min, this will cause the edge of the pole piece to be more wavy, and when the unwinding correction gradual shift speed of the unwinding correction mechanism is greater than 1.5mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual shift speed of the unwinding correction mechanism to between 0.1mm / min~1.5mm / min. Specifically, the rolling processing equipment can effectively improve the yield of the pole piece.

[0016] According to some embodiments of the rolling processing equipment of the present invention, the rolling processing equipment also includes a winding mechanism and a winding correction mechanism, the winding mechanism is used to wind up the pole piece, the winding correction mechanism is used to correct the pole piece, the controller is communicatively connected to the winding correction mechanism, and the controller is further configured to: make the unwinding correction reciprocating movement stroke of the unwinding mechanism within the range of the winding correction reciprocating movement stroke.

[0017] According to the rolling processing equipment of some embodiments of the present invention, the unwinding and deviation-correcting reciprocating movement stroke of the unwinding mechanism is -100 mm to 100 mm.

[0018] According to some embodiments of the rolling processing equipment of the present invention, the rolling processing equipment further includes a rolling mechanism, and the rolling mechanism is used to roll the pole piece.

[0019] According to the rolling processing equipment of some embodiments of the present invention, the rolling processing equipment further includes a thickness detection mechanism, and the thickness detection mechanism is used to detect the thickness of the pole piece after rolling.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 Schematic diagram of roller pressing equipment according to some embodiments of the present invention.

[0022] Reference numerals: Rolling processing equipment 10, unwinding mechanism 100, unwinding deviation correction mechanism 200, rolling mechanism 300, thickness detection mechanism 400, winding mechanism 500. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0028] The following first introduces the battery.

[0029] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0030] Batteries generally include cells. Cells include positive electrodes, negative electrodes, and separators. During the battery charging and discharging process, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator is set between the positive and negative electrodes to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0031] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0032] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0033] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0034] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2) and at least one of their modified compounds.

[0035] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0036] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0037] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0038] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0039] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0040] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0041] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0042] In some embodiments, the battery cell further includes a separator, which is disposed between the positive electrode and the negative electrode.

[0043] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability can be selected.

[0044] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0045] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0046] In some embodiments, the battery further comprises an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. The liquid electrolyte comprises an electrolyte salt and a solvent.

[0047] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0048] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0049] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0050] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0051] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0052] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0053] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0054] In some embodiments, the battery cell is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0055] In some embodiments, the battery cell has a stacked structure.

[0056] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0057] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0058] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0059] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0060] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0061] In some embodiments, the shape of the battery cell can be cylindrical, flat, or polygonal.

[0062] In some embodiments, the battery cell is provided with a tab, which can lead current out of the battery cell. The tab includes a positive tab and a negative tab.

[0063] In some embodiments, the battery may include a housing. The housing is used to encapsulate components such as the battery cell and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0064] As an example, the battery may be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include but are not limited to square-shell batteries, blade-shaped batteries, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0065] In the related art, the pole piece needs to be rolled during the manufacturing process. Rolling the pole piece has the following advantages: 1. The rolling process can keep the surface of the pole piece smooth and flat, thereby preventing the hidden danger of battery short circuit caused by burrs on the surface of the pole piece piercing the diaphragm, ensuring the safety performance of the battery; 2. The rolling process can compact the electrode material coated on the pole piece current collector, reduce the volume of the pole piece, and thus increase the energy density of the battery. In addition, compaction can also reduce the porosity between the active material, conductive agent, and binder inside the pole piece, further reduce the resistance of the battery, and improve the battery performance; 3. After the pole piece is coated and dried, the peel strength between the active material and the current collector foil is very low. Rolling can significantly enhance the bonding strength between them, prevent peeling during electrolyte immersion and battery use, thereby increasing the cycle life of the battery.

[0066] After long-term rolling, the roller surface is worn, which may cause the edge of the pole piece to have wavy edges after the roller rolls the pole piece, thereby resulting in a low yield of the pole piece. To this end, the present application proposes a battery manufacturing method.

[0067] Please refer to Figure 1 In some embodiments, the battery manufacturing method uses a rolling processing device 10 to process the battery, and the rolling processing device 10 includes: an unwinding mechanism 100 and an unwinding correction mechanism 200. The unwinding mechanism 100 is used to release the electrode. The electrode in the present application can be a positive electrode or a negative electrode. The unwinding correction mechanism 200 is used to correct the electrode. The battery manufacturing method includes the following steps: setting the unwinding correction gradual movement speed of the unwinding correction mechanism 200 to 0.1mm / min~1.5mm / min.

[0068] Specifically, by setting the unwinding correction gradual speed of the unwinding correction mechanism 200 to 0.1mm / min~1.5mm / min, the wavy edge of the pole piece can be effectively reduced, thereby improving the yield of the pole piece. Specifically, when the unwinding correction gradual speed of the unwinding correction mechanism 200 is less than 0.1mm / min, this will cause the edge of the pole piece to be more wavy. When the unwinding correction gradual speed of the unwinding correction mechanism 200 is greater than 1.5mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual speed of the unwinding correction mechanism 200 to between 0.1mm / min~1.5mm / min. Specifically, the battery manufacturing method can effectively improve the yield of the pole piece.

[0069] It is further explained that the unwinding correction gradual speed of the unwinding correction mechanism 200 is set to 0.1mm / min~1.5mm / min, which can be that the unwinding correction gradual speed is set to 0.1mm / min, the unwinding correction gradual speed is set to 0.5mm / min, the unwinding correction gradual speed is set to 1mm / min or the unwinding correction gradual speed is set to 1.5mm / min.

[0070] Further, please refer to Table 1.

[0071] Table 1

[0072] In Table 1, after the pole piece is continuously rolled for 100,000 meters, it can be concluded that when the unwinding correction gradual shifting speed of the unwinding correction mechanism 200 is less than 0.1 mm / min, this will cause the edge of the pole piece to appear wavy more often, and when the unwinding correction gradual shifting speed of the unwinding correction mechanism 200 is greater than 1.5 mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual shifting speed of the unwinding correction mechanism 200 to between 0.1 mm / min and 1.5 mm / min.

[0073] For further information, please refer to Figure 1 In some embodiments, the rolling processing equipment 10 further includes a winding mechanism 500 and a winding correction mechanism (not shown), the winding mechanism 500 is used to wind up the pole piece, and the winding correction mechanism is used to correct the pole piece. The battery manufacturing method also includes the following steps, making the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 within the reciprocating movement stroke of the winding correction. Specifically, by making the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 within the reciprocating movement stroke of the winding correction, this can effectively avoid the problem of breaking the pole piece during rolling, thereby improving the yield of the battery.

[0074] Furthermore, in some embodiments, the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 is -100mm to 100mm. Specifically, the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 can be between plus or minus 60mm. When the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 exceeds plus or minus 100mm, the risk of winding correction limit and belt breakage can be further prevented.

[0075] For further information, please refer to Figure 1In some embodiments, the rolling processing equipment 10 further includes a rolling mechanism 300, and the rolling mechanism 300 includes a roller. The battery manufacturing method further includes the following steps, detecting the worn area of ​​the roller, and using the less worn area of ​​the roller to roll the pole piece. Specifically, the rolling mechanism 300 may include two rollers, and the two rollers clamp the pole piece in the middle, thereby rolling the pole piece. After the roller is rolled for a long time, the surface of the roller will be worn. Therefore, by detecting the worn area of ​​the roller, the roller is divided into a middle area and two side areas, and it is detected that the degree of wear in the middle area is less than that in the two side areas, so the middle area can be used to roll the pole piece, which can effectively improve the yield of the pole piece.

[0076] In some embodiments, the battery is made by the battery manufacturing method of any one of the above embodiments. Specifically, by setting the unwinding correction gradual shift speed of the unwinding correction mechanism 200 to 0.1mm / min~1.5mm / min, the wavy edge of the pole piece can be effectively reduced, thereby improving the yield of the pole piece. Specifically, when the unwinding correction gradual shift speed of the unwinding correction mechanism 200 is less than 0.1mm / min, this will cause the edge of the pole piece to be wavy more often. When the unwinding correction gradual shift speed of the unwinding correction mechanism 200 is greater than 1.5mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual shift speed of the unwinding correction mechanism 200 to between 0.1mm / min~1.5mm / min. Specifically, the battery manufacturing method can effectively improve the yield of the pole piece. Furthermore, the yield of the battery made by the battery manufacturing method is also high.

[0077] Please refer to Figure 1In some embodiments, the rolling processing equipment 10 includes: an unwinding mechanism 100, a controller and an unwinding correction mechanism 200. The unwinding mechanism 100 is used to unwind the pole piece. The unwinding correction mechanism 200 is used to correct the pole piece. The controller is a feedback loop component widely used in industrial control applications, such as a programmable memory, which stores instructions for performing operations such as logical operations, sequential control, timing, counting and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog input and output. The controller is communicatively connected to the unwinding correction mechanism 200, and the controller is configured to control the unwinding correction gradual shift speed of the unwinding correction mechanism 200 to be 0.1mm / min~1.5mm / min. Specifically, after the controller controls the unwinding correction gradual shift speed of the unwinding correction mechanism 200 to be set to 0.1mm / min~1.5mm / min, the wavy edge of the pole piece can be effectively reduced, thereby improving the yield of the pole piece. Specifically, when the unwinding correction mechanism 200 has a gradual speed of less than 0.1 mm / min, the edge of the pole piece will be more wavy. When the unwinding correction mechanism 200 has a gradual speed of more than 1.5 mm / min, the pole piece may be broken. Therefore, the unwinding correction mechanism 200 has a gradual speed of 0.1 mm / min to 1.5 mm / min. Specifically, the rolling processing equipment 10 can effectively improve the yield of the pole piece.

[0078] It is further explained that the unwinding correction gradual speed of the unwinding correction mechanism 200 is set to 0.1mm / min~1.5mm / min, which can be that the unwinding correction gradual speed is set to 0.1mm / min, the unwinding correction gradual speed is set to 0.5mm / min, the unwinding correction gradual speed is set to 1mm / min or the unwinding correction gradual speed is set to 1.5mm / min.

[0079] Further, please refer to Table 2.

[0080] Table 2

[0081] In Table 2, after the pole piece is continuously rolled for 100,000 meters, it can be concluded that when the unwinding correction gradual shifting speed of the unwinding correction mechanism 200 is less than 0.1 mm / min, this will cause the edge of the pole piece to appear wavy more often, and when the unwinding correction gradual shifting speed of the unwinding correction mechanism 200 is greater than 1.5 mm / min, this may cause the pole piece to break. Therefore, it is better to set the unwinding correction gradual shifting speed of the unwinding correction mechanism 200 to between 0.1 mm / min and 1.5 mm / min.

[0082] For further information, please refer to Figure 1In some embodiments, the rolling processing equipment 10 also includes a winding mechanism 500 and a winding correction mechanism. The winding mechanism 500 is used to wind up the pole piece, and the winding correction mechanism is used to correct the pole piece. The controller is communicatively connected to the winding correction mechanism, and the controller is also configured to: make the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 within the reciprocating movement stroke of the winding correction. Specifically, by making the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 within the reciprocating movement stroke of the winding correction, this can effectively avoid the problem of breaking the pole piece during rolling, thereby improving the yield of the battery.

[0083] Furthermore, in some embodiments, the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 is -100mm to 100mm. Specifically, the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 can be between plus or minus 60mm. When the unwinding correction reciprocating movement stroke of the unwinding mechanism 100 exceeds plus or minus 100mm, the risk of winding correction limit and belt breakage can be further prevented.

[0084] For further information, please refer to Figure 1 In some embodiments, the rolling processing equipment 10 further includes a rolling mechanism 300, which is used to roll the pole piece. After rolling the pole piece, the surface of the pole piece can be kept smooth and flat, thereby preventing the hidden danger of battery short circuit caused by burrs on the surface of the pole piece piercing the diaphragm, thereby ensuring the safety performance of the battery. In addition, rolling the pole piece can also effectively improve the service life of the battery.

[0085] For further information, please refer to Figure 1 In some embodiments, the rolling processing equipment 10 further includes a thickness detection mechanism 400, which is used to detect the thickness of the pole piece after rolling. The thickness detection mechanism 400 can detect the thickness of the pole piece, thereby ensuring that the quality of the pole piece meets the requirements.

[0086] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery manufacturing method, characterized in that: The battery is processed using a roller pressing device, the roller pressing device comprising: An unwinding mechanism, used for releasing the pole piece; An unwinding and correcting mechanism, used for correcting the pole piece; The battery manufacturing method comprises the following steps: The unwinding deviation correction gradual moving speed of the unwinding deviation correction mechanism is set to 0.1mm / min~1.5mm / min.

2. The battery manufacturing method according to claim 1, characterized in that: The rolling processing equipment also includes a winding mechanism and a winding correction mechanism, wherein the winding mechanism is used to wind up the pole piece and the winding correction mechanism is used to correct the pole piece. The battery manufacturing method also includes the following steps, so that the unwinding correction reciprocating movement stroke of the unwinding mechanism is within the range of the winding correction reciprocating movement stroke.

3. The battery manufacturing method according to claim 2, characterized in that: The unwinding and deflection-correcting reciprocating movement stroke of the unwinding mechanism is from -100mm to 100mm.

4. The battery manufacturing method according to claim 1, characterized in that: The rolling processing equipment also includes a rolling mechanism, and the rolling mechanism includes a roller. The battery manufacturing method also includes the following steps: detecting the worn area of ​​the roller and using the less worn area of ​​the roller to roll the pole piece.

5. A battery, characterized in that The battery is produced by the battery production method according to any one of claims 1 to 4.

6. Rolling processing equipment, characterized in that: include: An unwinding mechanism, used for releasing the pole piece; An unwinding and correcting mechanism, used for correcting the pole piece; The controller is communicatively connected to the unwinding and correcting mechanism, and the controller is configured to control the unwinding and correcting gradual moving speed of the unwinding and correcting mechanism to be 0.1 mm / min to 1.5 mm / min.

7. The rolling processing equipment according to claim 6, characterized in that: The rolling processing equipment further includes a winding mechanism and a winding correction mechanism, wherein the winding mechanism is used to wind up the pole piece, and the winding correction mechanism is used to correct the deviation of the pole piece. The controller is communicatively connected to the winding and deflection-correcting mechanism, and the controller is further configured to: make the unwinding and deflection-correcting reciprocating movement stroke of the unwinding mechanism within the range of the winding and deflection-correcting reciprocating movement stroke.

8. The rolling processing equipment according to claim 7, characterized in that: The unwinding and deflection-correcting reciprocating movement stroke of the unwinding mechanism is from -100mm to 100mm.

9. The rolling processing equipment according to claim 6, characterized in that: The rolling processing equipment also includes a rolling mechanism, and the rolling mechanism is used to roll the pole piece.

10. The rolling processing equipment according to claim 9, characterized in that: The rolling processing equipment further comprises a thickness detection mechanism, and the thickness detection mechanism is used to detect the thickness of the pole piece after rolling.

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