Winding core, battery, battery assembly, electric device, and diaphragm cutter, Winding device

Abstract

The utility model discloses a kind of roll core, battery, battery assembly, electric equipment and diaphragm cutter, winding device, it is related to battery field.The thickness of diaphragm in roll core is d, and satisfy 0 μm<d<7 μm;Diaphragm includes film body and the inner roll structure of being arranged at film body in length direction one end.Inner roll structure includes: first roll section, second roll section and third roll section, first roll section one end connects film body;Second roll section one end connects the other end of first roll section, second roll section is relatively bent and set to first roll section;Third roll section connects the other end of second roll section, third roll section is relatively bent and set to second roll section;And first roll section, third roll section are located in the same side of second roll section to make inner roll structure present C shape, or first roll section, third roll section are located in opposite sides of second roll section to make inner roll structure present Z shape.Roll core is arranged into C shape or Z shape inner roll structure in center, realize end portion winding stable forming, promote the consistency and reliability of roll core manufacturing.

Description

Technical Field

[0001] The present utility model relates to the technical field of batteries, and in particular, to a winding core, a battery, a battery module, an electric device, a separator cutter, and a winding device. Background Art

[0002] In the prior art, as the energy density of batteries increases, separators tend to be thinner and lighter. Some conventional winding structures are difficult to achieve stable molding at the end, and are prone to problems such as irregular shape and poor fitting, which in turn leads to inconsistent thickness of the winding core.

[0003] Therefore, how to improve the inner winding structure of the separator to improve the molding stability and thickness consistency of the separator end has become one of the research directions. Summary of the Utility Model

[0004] The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the first aspect of the present utility model is to provide a winding core, which improves the fitting property and structural consistency of the wound winding core.

[0005] An object of the second aspect of the present utility model is to provide a battery including the above winding core.

[0006] An object of the third aspect of the present utility model is to provide a battery module including the above battery.

[0007] An object of the fourth aspect of the present utility model is to provide an electric device including the above battery or battery module.

[0008] An object of the fifth aspect of the present utility model is to provide a separator cutter for processing the above winding core.

[0009] An object of the sixth aspect of the present utility model is to provide a winding device having the above separator cutter.

[0010] The winding core according to the embodiment of the first aspect of the present utility model includes at least two pole pieces and a separator sandwiched between every two of the pole pieces. The thickness of the separator is d, and satisfies 0μm < d < 7μm; the separator includes a separator body and an inner winding structure provided at one end of the separator body in the length direction, the inner winding structure is wound around the center of the winding core, and the inner winding structure includes: a first winding segment, a second winding segment and a third winding segment, one end of the first winding segment is connected to the separator body; one end of the second winding segment is connected to the other end of the first winding segment, and the second winding segment is bent relative to the first winding segment; the third winding segment is connected to the other end of the second winding segment, and the third winding segment is bent relative to the second winding segment; and the first winding segment and the third winding segment are located on the same side of the second winding segment so that the inner winding structure is C-shaped, or the first winding segment and the third winding segment are located on opposite sides of the second winding segment so that the inner winding structure is Z-shaped.

[0011] According to some embodiments of this utility model, the core, by setting an inward-rolling structure on the diaphragm consisting of a first roll segment, a second roll segment, and a third roll segment, and bending the first roll segment and the third roll segment relative to the second roll segment, can achieve stable forming of the diaphragm end at the beginning of the winding stage. This stable inward-rolling structure improves the adhesion, consistency, and uniformity of the diaphragm at the center of the core, and also effectively solves the problems of unstable bending and irregular shape that easily occur in traditional processes for ultra-thin diaphragms (thickness less than 7μm), thereby improving the uniformity of the overall core structure and enhancing the overall performance of the core.

[0012] A battery according to a second aspect embodiment of the present invention includes a casing and a winding core according to a first aspect embodiment of the present application, the winding core being disposed within the casing. Due to the improved overall structural uniformity of the winding core, battery performance can be enhanced.

[0013] A battery assembly according to a third aspect of the present invention includes a battery and a circuit structure according to a second aspect of the present application, wherein the circuit structure is electrically connected to the battery.

[0014] The electrical equipment according to the fourth aspect of the present invention includes a battery according to the second aspect of the present application or a battery assembly according to the third aspect of the present application.

[0015] A diaphragm cutter according to a fifth aspect embodiment of the present invention is used to process the core as described in the first aspect embodiment of the present invention. The diaphragm cutter includes: a blade body and a cutting edge, the cutting edge being disposed at one end of the blade body and used to cut off one end edge of the diaphragm in the length direction; wherein, the blade body is provided with a venting end, the venting end being disposed towards the cutting edge; the venting end is configured to draw air or blow air onto the diaphragm when the diaphragm is wound to form the inward roll structure, so as to adsorb or blow air onto the end of the diaphragm to bend and form the third roll segment.

[0016] In some embodiments, the vent end includes a plurality of air holes arranged along a first direction, the first direction being parallel to or forming an acute angle with the width direction of the diaphragm.

[0017] Optionally, the blade portion includes a plurality of serrations arranged along a first direction, the first direction being parallel to or forming an acute angle with the width direction of the diaphragm.

[0018] Furthermore, the saw teeth have tips, and the vent end includes at least one air hole corresponding to the tip of the saw teeth.

[0019] Optionally, the cutting edge is located at one end of the blade body opposite to it along a second direction, which is perpendicular to the first direction. The blade body has a main air passage and multiple branch air passages, one end of each branch air passage forming the air hole, and the other end of each branch air passage connecting to the main air passage. The blade body has an air source connection end connecting to the main air passage.

[0020] According to some optional embodiments, the blade body includes: a first plate and a second plate, one end of the first plate along the second direction is connected to the cutting edge; the second plate is connected to the other end of the first plate along the second direction, the thickness of the second plate is greater than the thickness of the first plate, a step surface is formed at the connection between the second plate and the first plate, the step surface is disposed facing the cutting edge, and the air hole is formed on the step surface.

[0021] In some embodiments, the first plate and the second plate are an integrated structure.

[0022] The second plate includes a flat plate portion and a protruding plate portion, which are arranged along the thickness direction of the second plate. The flat plate portion is connected to and flush with the first plate. The end face of the protruding plate portion includes the blade-step surface. The main air passage and a plurality of branch air passages are formed within the protruding plate portion.

[0023] A winding device according to a sixth aspect embodiment of the present invention includes: a winding member and a diaphragm cutter. The winding member has an openable and closable slit. The diaphragm includes, at one end along its length, a first segment, a second segment, and a third segment arranged sequentially. The second segment is adapted to be clamped within the slit, and the first and third segments are adapted to be respectively disposed on opposite sides of the slit. The diaphragm cutter is disposed on the side of the winding member exposing the third segment. The diaphragm cutter is used to cut the edge of one end of the diaphragm along its length when the winding member clamps the diaphragm, and cooperates with the winding member to suction or blow the third segment, so that the first segment becomes a first rolled segment, the second segment becomes a second rolled segment, and the third segment becomes a third rolled segment. Here, the diaphragm cutter is the diaphragm cutter of the second aspect embodiment of the present invention.

[0024] In some optional embodiments, the winding member includes two winding needles, namely: a fixed winding needle and a movable winding needle. The fixed winding needle is rotatable, and one side of the fixed winding needle forms a clamping and fixing surface. The movable winding needle is connected to the fixed winding needle, and one side of the movable winding needle forms a movable fixing surface facing the clamping and fixing surface. The clamping and fixing surface and the movable fixing surface define the gap. The movable winding needle is movable relative to the fixed winding needle in the thickness direction of the gap to open and close the gap. The diaphragm cutter is disposed on one side of the fixed winding needle or the movable winding needle.

[0025] Furthermore, the distance between the vent end and the end of the blade portion along the second direction is X1, X1 exceeding the width of a single coil needle, and the second direction is perpendicular to the width direction of the diaphragm; the width of the coil needle is the dimension of the coil needle along the thickness direction of the slit.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the core (when the inner roll structure 312 is C-shaped) in some embodiments of the present invention;

[0029] Figure 2 This is a schematic diagram of the core structure (when the inner winding structure 312 is Z-shaped and the electrode is hidden) in some embodiments of this utility model;

[0030] Figure 3 This is a schematic diagram of the diaphragm cutter in some embodiments of the present invention;

[0031] Figure 4 This is a side view of the diaphragm cutter in some embodiments of the present invention;

[0032] Figure 5 This is a schematic diagram showing the positions of the main air passage and branch air passage in the blade body in some embodiments of this utility model;

[0033] Figure 6 This is a schematic diagram of the winding device in some embodiments of the present invention;

[0034] Figure 7 This is a schematic diagram of the winding device in some embodiments of the present invention.

[0035] Figure label:

[0036] Winding device 100

[0037] Diaphragm cutter 10

[0038] Blade body 11, first plate 111, second plate 112, vent end 1121, air hole 11211, main air passage 1122, branch air passage 1123, blade step surface 1125, air source connection end 1126, flush plate portion 112a, protruding plate portion 112b, cutting edge portion 13, serration 131, tooth tip 1311

[0039] 20 winding parts, 201 gaps

[0040] Fixed coil needle 22, clamping and fixing surface 221, movable coil needle 24, movable fixing surface 241.

[0041] Core 300

[0042] 310 diaphragm, 311 membrane body, 312 inward roll structure, 3121 first roll segment, 3122 second roll segment, 3123 third roll segment

[0043] Electrode 320. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] The following is for reference. Figure 1 and Figure 2 Description of the core 300 according to an embodiment of the present utility model.

[0048] According to a first aspect embodiment of the present invention, the winding core 300 includes at least two electrode sheets 320 and a diaphragm 310 sandwiched between each pair of electrode sheets 320. The diaphragm 310 has a thickness d and satisfies 0 μm. <d<7μm。

[0049] As is known to those skilled in the art, the two electrodes 320 are a positive electrode and a negative electrode, respectively. The surface of the positive electrode is provided with a positive active material, and the surface of the negative electrode is provided with a negative active material. The separator 310 serves as an isolation layer between the positive and negative electrodes, separating the positive and negative active materials. Simultaneously, the separator 310 has pores, allowing ions to migrate between the positive and negative electrodes after being wetted by the electrolyte, thereby enabling the charging or discharging (i.e., generating current) of the core 300. The separator 310 itself does not contain active material and does not increase capacity. By controlling the thickness of the separator 310 to d < 7 μm, the ineffective space inside the core 300 can be effectively reduced, increasing the proportion of positive and negative active materials, thus accommodating more active material within the same size and improving energy density.

[0050] like Figure 1 and Figure 2 As shown, the diaphragm 310 includes: a membrane body 311 and an inwardly rolled structure 312 disposed at one end of the membrane body 311 in the length direction, the inwardly rolled structure 312 being rolled around the center of the core 300.

[0051] The inward-rolling structure 312 serves as the starting section for winding. After being clamped by the winding element 20 in the winding device 100, it guides the subsequent winding of the diaphragm 310 and the electrode 320.

[0052] Therefore, the inward-rolling structure 312 has a certain bending or folding structure, which increases the contact area and friction between the diaphragm 310 and the winding structure, prevents the diaphragm 310 from sliding or falling off in the initial stage of winding, and improves the stability of the winding process of the diaphragm 310.

[0053] Specifically, the involute structure 312 includes: a first roll segment 3121, a second roll segment 3122, and a third roll segment 3123. One end of the first roll segment 3121 is connected to the membrane body 311.

[0054] One end of the second roll segment 3122 is connected to the other end of the first roll segment 3121, and the second roll segment 3122 is bent relative to the first roll segment 3121. The second roll segment 3122 and the first roll segment 3121 form a certain angle, so that the inner roll structure 312 can more easily fit the surface of the winding part 20.

[0055] The third roll segment 3123 connects to the other end of the second roll segment 3122, and the third roll segment 3123 is bent relative to the second roll segment 3122 to enhance the wrapping and adhesion during the winding process. The third roll segment 3123 is the starting winding segment of the inner roll structure 312.

[0056] This segmented bending structure helps to increase the contact area between the inner winding structure 312 and the winding element 20, and also enhances the anti-slip ability in the early stage of winding. It helps to prevent the diaphragm 310 from shifting or falling off in the initial stage of winding, thereby guiding the subsequent winding of the diaphragm 310 and the electrode 320 stably, and improving the overall structural consistency of the core 300.

[0057] In some technical solutions, the first roll segment 3121 and the third roll segment 3123 are located on the same side of the second roll segment 3122 so that the inner roll structure 312 is C-shaped.

[0058] The C-shaped inward roll structure 312 creates a wrapping-like effect, enhancing the adhesion between the starting section and the winding element 20. At the same time, the C-shaped inward roll structure 312 has fewer folds, avoiding the increase in thickness at the starting end due to multiple stacks, which helps to reduce the overall thickness of the core 300.

[0059] Alternatively, the first roll segment 3121 and the third roll segment 3123 are located on opposite sides of the second roll segment 3122 so that the inner roll structure 312 is Z-shaped. This makes the inner roll structure 312 form an approximately zigzag shape, which is conducive to achieving stable adhesion with the surface of the winding component 20, thereby improving the stability of the winding process and enhancing the uniformity and consistency of the core 300 structure.

[0060] A battery according to a second aspect embodiment of the present invention includes a housing and a winding core 300 disposed within the housing. The winding core 300 adopts the winding core 300 structure described in the first aspect embodiment. By adopting the improved winding core 300, the utilization rate of the battery's internal space is improved. At the same time, the improved winding core 300 helps to enhance the adhesion stability between the electrode 320 and the separator 310.

[0061] The battery assembly according to a third aspect embodiment of the present invention includes the battery and circuit structure of the second aspect embodiment of the present application, wherein the battery structure is electrically connected to the battery.

[0062] Optionally, the battery assembly includes at least two cells, which are connected in series or in parallel. By employing performance-optimized cells, the overall energy density, cycle stability, and safety performance of the battery assembly are improved.

[0063] The electrical device according to the fourth aspect embodiment of the present invention includes the battery of the second aspect embodiment or the battery assembly of the third aspect embodiment of the present application. By using an optimized battery or battery assembly, it helps to improve the overall battery life, usage stability and safety of the electrical device.

[0064] It should be noted that the electrical equipment referred to here includes, but is not limited to, new energy vehicles, power tools, ships, and spacecraft. New energy vehicles can be pure electric vehicles, range-extended electric vehicles, etc. Specifically, a battery pack is installed within the vehicle. Here, the battery pack can be used to power the vehicle; for example, the battery pack can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery pack to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this application, the battery pack can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0065] The following is combined with Figures 3-5 The diaphragm cutter 10 according to a fifth aspect embodiment of the present invention is described.

[0066] This diaphragm cutter 10 is used to process the core 300 according to the first aspect embodiment of the present invention, mainly for forming the diaphragm 310. The diaphragm cutter 10 of this embodiment is used to cut one end of the diaphragm 310 along its length. The cutter cuts the end of the diaphragm 310 along its width direction, forming an edge, which facilitates the stable formation of the inner roll structure 312 during the subsequent winding of the core 300.

[0067] Specifically, such as Figure 3 As shown, the diaphragm cutter 10 includes a blade body 11 and a cutting edge 13. The cutting edge 13 is located at one end of the blade body 11 and is used to cut off one end edge of the diaphragm 310 in the length direction.

[0068] Here, the cutting method of the diaphragm cutter 10 is not limited. In some optional embodiments, the blade portion 13 extends along a first direction, which is consistent with the width direction of the diaphragm 310, that is, the first direction is parallel to the width direction of the diaphragm 310, or the first direction forms an acute angle with the width direction of the diaphragm 310. For example, if the blade portion 13 of the diaphragm cutter 10 is parallel to the width direction of the diaphragm 310, a tangent extending along the width direction of the diaphragm 310 can be directly cut at the end of the diaphragm 310.

[0069] In some alternative embodiments, the blade portion 13 is a spike, and when the diaphragm cutter 10 cuts the edge, the blade portion 13 is moved along the first direction, thereby drawing a tangent line extending along the width direction of the diaphragm 310 at the end of the diaphragm 310.

[0070] In some alternative embodiments, the blade portion 13 performs a transverse cut along the width direction of the diaphragm 310 during the cutting process, thereby achieving precise cutting of the end edge of the diaphragm 310. Since the extension direction of the blade portion 13 is consistent with the width direction of the diaphragm 310, and the cutting direction is perpendicular to the winding direction of the diaphragm 310, the force is evenly distributed during the cutting process, making it less prone to deviation or tearing, and ensuring a smooth cut edge.

[0071] Among them, combined Figure 3 The blade body 11 is provided with a vent 1121, which is positioned facing the blade portion 13. Optionally, the vents are arranged along a first direction.

[0072] In some technical solutions, the venting end is constructed as a continuous venting groove. The venting groove extends along the first direction of the blade body 11 (i.e., the diaphragm width direction). Specifically, the venting groove extends from one end of the blade body 11 to the other end, forming a continuous venting path. The continuous venting groove can ensure that the airflow is evenly distributed across the entire width of the diaphragm, thereby enabling large-area adsorption or blowing of the diaphragm 310.

[0073] Alternatively, the ventilation groove can be machined by drilling, milling, or other methods to reduce production complexity and cost.

[0074] In some other technical solutions, the venting end is constructed as a segmented venting groove or vent. Each segment is evenly spaced. This helps to achieve a uniform distribution of airflow along the first direction, improving the consistency and stability of the diaphragm bending.

[0075] Specifically, the vent 1121 is an air intake port, or an air blowing port, or the vent 1121 can both intake and blow air. The vent 1121 is configured to intake or blow air onto the diaphragm 310 when the diaphragm 310 is wound to form the inward roll structure 312, so as to adsorb or blow the end of the diaphragm 310 to bend into a third roll segment 3123.

[0076] During the process of bending the end of the diaphragm 310 to form the third roll 3123, the vent 1121 pushes the diaphragm 310 by suction or blowing air, causing the diaphragm 310 to bend in a predetermined direction, thereby achieving the positioning and bending of the third roll 3123.

[0077] Compared to some methods that use traditional mechanical clamping or pushing, positioning and bending the diaphragm 310 by airflow can avoid damage or deformation of the diaphragm 310 that may be caused by mechanical operation, thus improving the reliability of the processing.

[0078] Meanwhile, the airflow is uniform and can adapt to diaphragms 310 of various thicknesses. Especially when the diaphragm 310 is thin, for example, when the thickness d is less than 7μm, the diaphragm 310 is very susceptible to damage or deformation due to external mechanical forces. In this case, using airflow to adsorb or push the ends of the diaphragm 310 can effectively avoid the risk of damage from direct mechanical contact and ensure the integrity and stability of the diaphragm 310 during the bending and forming process.

[0079] Of course, the blade body 11 is provided with an air source connection end 1126 for connecting to the air supply end 1121.

[0080] In some such Figure 6 In the illustrated embodiment, the vent 1121 is an air outlet, and the air source connection 1126 is an air inlet. Gas enters at the air source connection 1126 and blows air onto the vent 1121. When the diaphragm 310 is wound around the inward roll structure 312, the air blowing at the vent 1121 causes the diaphragm 310 to bend. The air source connection 1126 can be connected to an air pump, etc.

[0081] Or, in some such Figure 7 In the illustrated embodiment, the vent 1121 is the intake port, and the gas source connection 1126 is the outlet port. The gas source connection 1126 draws gas away from the vent 1121. When the diaphragm 310 is wound around the inward roll structure 312, the vent 1121 draws in gas and adsorbs the diaphragm 310, causing it to bend. The gas source connection 1126 can be connected to a vacuum pump, etc.

[0082] In some optional technical solutions, the airflow intensity can be adjusted according to actual processing requirements to accommodate diaphragms 310 of different thicknesses, achieving more precise control over diaphragms 310 of various thicknesses. For example, when the diaphragm 310 is thin, the airflow intensity can be appropriately reduced to avoid excessive deformation or displacement of the diaphragm 310 due to excessive airflow; while when rapid positioning or bending of thicker diaphragms 310 is required, the airflow can be increased to improve operating efficiency and molding stability.

[0083] Optionally, the airflow action of the pores 11211 is synchronized with the cutting action of the saw teeth 131. This allows the airflow to apply an adsorption or blowing effect to the diaphragm 310 while it is being cut, ensuring that the diaphragm 310 is stably positioned at the moment of cutting, thereby further improving the consistency of processing.

[0084] In some embodiments, such as Figures 3-5 As shown, the vent 1121 includes a plurality of vents 11211 arranged along the first direction.

[0085] These air holes 11211 are all disposed on the blade body 11 and face the blade edge 13. The first direction is consistent with the width direction of the diaphragm 310, that is, the first direction is parallel to the width direction of the diaphragm 310 or forms an acute angle with it. By arranging the air holes 11211 along the width direction, the airflow can cover the entire width range of the end of the diaphragm 310, making the adsorption or blowing effect more uniform and stable.

[0086] This multi-pore structure 11211, arranged along the width direction, helps to enhance the control of airflow over the end of the diaphragm 310. Especially when the diaphragm 310 is thin, it can avoid deformation or displacement caused by uneven local stress, thereby improving the uniformity and consistency of the bending of the involute structure 312.

[0087] It should be noted that during the cutting and subsequent forming process of the diaphragm 310 by the diaphragm cutter 10 in this application, the air holes 11211 arranged along the width direction can help the end of the diaphragm 310 achieve more precise positioning and bending, so that the final C-shaped or Z-shaped inward roll structure 312 is more neat, which in turn helps to improve the forming quality and overall thickness consistency of the winding start section of the core 300.

[0088] In some alternative embodiments, the pores 11211 are uniformly distributed on the blade body 11. The uniformly spaced pores 11211 further ensure that the airflow acts uniformly in the entire width direction of the diaphragm 310, thereby improving the control precision of adsorption or blowing at the end of the diaphragm 310 and helping to form a flat, consistent inward-rolling structure 312.

[0089] Alternatively, the shape of the vent 11211 can be flexibly set according to the actual processing technology and airflow control requirements. For example, the vent 11211 can be cylindrical, square, or other geometric shapes suitable for airflow conduction. Here, vents 11211 of different shapes can all functionally achieve the adsorption or blowing effect on the end of the diaphragm 310.

[0090] Alternatively, the number and spacing of the pores 11211 can be adjusted according to the thickness of the diaphragm 310. For example, for a thinner diaphragm 310, the number of pores 11211 can be increased and the spacing reduced to provide more uniform airflow control; while for a thicker diaphragm 310, the number of pores 11211 can be appropriately reduced and the spacing increased to enhance the force of each individual pore 11211.

[0091] Optionally, the blade portion 13 includes a plurality of serrations 131 arranged along a first direction. The first direction is consistent with the width direction of the diaphragm 310, that is, the first direction is parallel to the width direction of the diaphragm 310 or the angle between the first direction and the width direction is acute.

[0092] Multiple serrations 131 can disperse the cutting force during the cutting process, avoiding the tearing of the diaphragm 310 that may be caused by excessive force at a single point.

[0093] Meanwhile, the serrations 131 on the blade 13 can reduce the formation of burrs at the edge of the diaphragm 310. This reduces the potential damage to the positive and negative electrode materials at the edge of the diaphragm 310, improving the safety and lifespan of the core 300.

[0094] Furthermore, the serration 131 has a tooth tip 1311, and at least a portion of the air holes 11211 are provided in a one-to-one correspondence with the tooth tips 1311 of at least a portion of the serration 131.

[0095] The above technical solution enables the airflow action point and the cutting action point to work together, thereby achieving more precise control during the diaphragm 310 processing.

[0096] In addition, the airflow in the tooth tip 1311 area can also help the inner roll structure 312 to smoothly enter the bending and winding position in subsequent processes, which helps to improve the forming quality of the inner roll structure 312, making the third roll segment 3123 flatter and more stable, improving the fit of the core 300 at the beginning of the winding stage, and also helping to enhance the uniformity and consistency of the overall structure of the core 300.

[0097] Further optional, such as Figure 5 As shown, the blade body 11 is a plate extending along the first direction, and the cutting edge 13 is located at one end of the blade body 11.

[0098] In some specific embodiments, such as Figure 5 As shown, the cutting edge 13 is located at one end of the blade body 11 opposite to it along a second direction, which is perpendicular to the first direction. The blade body 11 contains a main air passage 1122 and multiple branch air passages 1123. One end of each branch air passage 1123 forms an air hole 11211, and the other end of each branch air passage 1123 connects to the main air passage 1122. The main air passage 1122 is connected to an air source connection terminal 1126.

[0099] This airflow structure design allows airflow to be uniformly introduced through the main air passage 1122 and evenly distributed to each air hole 11211 via multiple branch air passages 1123, thereby achieving stable control of the end of the diaphragm 310 in the entire width direction.

[0100] The distribution of the bronchial ducts 1123 can be either evenly spaced or non-evenly spaced, and can be adjusted according to the position and number of the pores 11211 and the width of the diaphragm 310.

[0101] In some technical solutions, the main air passage 1122 and the branch air passage 1123 can be embedded airflow channels directly machined inside the blade body 11. For example, they can be formed by drilling, milling, or casting. Since the air passages are directly machined or formed inside the blade body 11, external connection interfaces and transition structures are reduced, thereby reducing airflow fluctuation problems caused by connection point failures. In addition, the embedded channel structure is more compact, and the airflow path is shorter and more regular, which helps to reduce eddies, pressure losses, or local obstructions in the airflow transmission process, making the airflow output from each air hole 11211 more consistent and improving the control accuracy of adsorption or blowing at the end of the diaphragm 310.

[0102] Alternatively, the main airway 1122 and branch airways 1123 can be independent piping structures embedded inside the blade body 11, with a sealed connection to achieve stable airflow transmission. Here, the main airway 1122 and branch airways 1123 can be flexible or rigid tubing. The embedded design facilitates airway replacement and maintenance.

[0103] Specifically, such as Figure 5 As shown, the main air passage 1122 is located at one end of multiple branch air passages 1123, and the blade body 11 is provided with an air source connection end 1126 that connects to the main air passage 1122.

[0104] In this way, external gas (such as air or inert gas) can enter the main air passage 1122 through the gas source connection terminal 1126, and be evenly and quickly distributed to different working areas of the blade along the branch air passage 1123, ensuring a wide gas coverage and balanced flow distribution.

[0105] According to some optional embodiments, such as Figure 3 As shown, the blade body 11 includes a first plate 111 and a second plate 112. One end of the first plate 111 along a second direction is connected to the cutting edge 13. The second plate 112 is connected to the other end of the first plate 111 along the second direction, and an air hole 11211 is formed on the end face of the second plate 112 facing the cutting edge 13. The blade body 11 has a simple structure.

[0106] Among them, such as Figure 3As shown, the thickness of the second plate 112 is greater than the thickness of the first plate 111. A cutting edge surface 1125 is formed at the connection point between the second plate 112 and the first plate 111. The cutting edge surface 1125 faces the cutting edge 13, and pores 11211 are formed on the cutting edge surface 1125. This arrangement facilitates the use of the thickness difference between the first plate 111 and the second plate 112 to form the cutting edge surface 1125, and then the pores 11211 are machined from the cutting edge surface 1125. The pores 11211 can directly face the cutting edge 13, and drilling tools can be used directly during hole machining, making the machining method simple and direct.

[0107] Optionally, the first plate 111 and the second plate 112 are an integral structure. The second plate 112 includes a flush plate portion 112a and a protruding plate portion 112b, which are arranged along the thickness direction of the second plate 112. The flush plate portion 112a is connected to and flush with the first plate 111, and the end face of the protruding plate portion 112b includes a blade step surface 1125, with multiple air passages 1123 formed within the protruding plate portion 112b. This saves material on the blade body 11, and the blade body 11 is thin overall, without affecting other surrounding tooling.

[0108] In the above technical solution, a portion of the first plate 111 undertakes the cutting function. Optionally, the first plate 111 can be made of high-strength, high-wear-resistant materials to ensure the cutting stability and service life of the blade portion 13, or the blade portion 13 in the first plate 111 can be made of high-strength, high-wear-resistant materials.

[0109] The second plate 112 is used to control the airflow. The end face of the second plate 112 faces directly toward the blade portion 13, so that the air holes 11211 face toward the end of the diaphragm 310, which helps to improve the control of the airflow. Especially during the bending and forming process of the diaphragm 310, the airflow can effectively guide the end of the diaphragm 310 to bend in a predetermined shape, improving the forming stability of the inward roll structure 312.

[0110] The first plate 111 and the second plate 112 can be formed in one process. Specifically, the first plate 111 and the second plate 112 can be integrally cast. Of course, this utility model is not limited to this; the second plate 112 can also be formed after the first plate 111 has been formed. In this case, the first plate 111 and the second plate 112 are formed after two processing steps. It can be understood that regardless of the specific processing order of the first plate 111 and the second plate 112, as long as the first plate 111 and the second plate 112 are an integral structure after the blade body 11 is fully processed, it is acceptable.

[0111] In yet other embodiments, combined with Figure 5The main airway 1122 extends along a first direction, and multiple branch airways 1123 are parallel and extend along a second direction, which is perpendicular to the first direction.

[0112] In the above technical solution, the main air passage 1122 is arranged along the first direction, which helps to cover the entire width range of the end of the diaphragm 310 and ensures that the airflow supply in the width direction is continuous and stable.

[0113] Multiple branch air passages 1123 branch off from the main air passage 1122 and extend vertically, forming an air hole 11211 at one end. Through the vertical arrangement of the branch air passages 1123, the air holes 11211 can be regularly arranged on the surface of the blade body 11, ensuring uniform distribution of airflow in the width direction, thereby improving the control accuracy of the diaphragm 310.

[0114] Meanwhile, the bronchial passage 1123 is drawn out from the main air passage 1122, so that the airflow can be quickly and evenly delivered to each air hole 11211, reducing airflow loss and improving airflow utilization.

[0115] like Figures 6-7 As shown, the winding apparatus 100 according to a third aspect embodiment of the present invention includes: a winding member 20 and a diaphragm cutter 10. Here, the diaphragm cutter 10 is the diaphragm cutter 10 of the second aspect embodiment of the present invention.

[0116] The cutting and bending of the diaphragm 310 end is controlled by the cooperation of the diaphragm cutter 10 and the winding member 20.

[0117] The winding member 20 is provided with an openable slit 201, wherein the diaphragm 310 includes a first section, a second section, and a third section arranged sequentially at one end in the length direction, the second section is adapted to be clamped in the slit 201, and the first section and the third section are adapted to be placed on both sides of the slit 201.

[0118] The second segment is clamped within the gap 201 for stable fixation. The first and third segments are located on either side of the gap 201.

[0119] A diaphragm cutter 10 is disposed on the side of the winding member 20 where the third segment is exposed. The diaphragm cutter 10 is used to cut one end edge of the diaphragm 310 in the length direction when the winding member 20 clamps the diaphragm 310, and cooperates with the winding member 20 to suck or blow the third segment, so that the first segment becomes the first roll segment 3121, the second segment becomes the second roll segment 3122, and the third segment becomes the third roll segment 3123.

[0120] The diaphragm cutter 10 is positioned on the side of the winding 20 where the third segment is exposed, allowing the cutter to accurately target the third segment of the diaphragm 310. Simultaneously, it provides working space for the air holes 11211 on the cutter. Simultaneously or subsequently, the airflow control function applies a directional force to the third segment, causing it to bend along a predetermined path and adhere to the winding 20, forming a stable third segment 3123. This process reduces uncertainties caused by manual intervention or mechanical clamping, improving the adhesion and structural consistency of the initial winding segment.

[0121] The above technical solution, by employing an improved diaphragm cutter 10 and utilizing the cooperation between the blade portion 13 and the airflow-assisted structure, improves the effective control over the bending shape of the diaphragm 310.

[0122] In some optional embodiments, the winding member 20 includes two winding needles: a fixed winding needle 22 and a movable winding needle 24. The fixed winding needle 22 is rotatable, and one side of the fixed winding needle 22 forms a clamping fixing surface 221. The movable winding needle 24 is connected to the fixed winding needle 22, and one side of the movable winding needle 24 forms a movable fixing surface 241 facing the clamping fixing surface 221. A gap 201 is defined between the clamping fixing surface 221 and the movable fixing surface 241. The movable winding needle 24 is movable relative to the fixed winding needle 22 in the thickness direction of the gap 201 to open and close the gap 201. A diaphragm cutter 10 is provided on one side of either the fixed winding needle 22 or the movable winding needle 24.

[0123] Specifically, before clamping the diaphragm 310, the movable coil needle 24 can move relative to the fixed coil needle 22 to open the slit 201, which facilitates the insertion and positioning of the diaphragm 310; after clamping, the slit 201 closes to achieve stable clamping of the second section of the diaphragm 310.

[0124] The diaphragm cutter 10 is located on the outside of the slit 201 (i.e., on the side where the coiling needle 22 is fixed or the coiling needle 24 is moved), and can cut the end of the diaphragm 310 after it is clamped in the slit 201. At the same time, the airflow-assisted structure on the cutter can adsorb or blow the third section, guiding it to bend and form a predetermined winding structure.

[0125] Once the diaphragm 310 is clamped and fixed, the fixed winding needle 22 drives the movable winding needle 24 to rotate and perform a winding action.

[0126] In some technical solutions, such as Figure 6 As shown, the movable winding needle 24 is installed on the left side of the diaphragm 310, the fixed winding needle 22 is installed on the right side of the diaphragm 310, and the diaphragm cutter is a positive pressure blower.

[0127] In some technical solutions, such as Figure 7As shown, the movable winding needle 24 is installed on the right side of the diaphragm 310, the fixed winding needle 22 is installed on the left side of the diaphragm 310, and the diaphragm cutter uses negative pressure suction.

[0128] Furthermore, in combination Figure 5 The distance between the vent end 1121 and the end of the blade portion 13 in the second direction is X1, which exceeds the width of a single coil needle; the width of the coil needle is the dimension of the coil needle along the thickness direction of the slit 201. Here, the second direction is perpendicular to the width direction of the diaphragm 310.

[0129] This configuration ensures that the vent 1121 is always outside the needle winding path, preventing structural interference between the vent 11211 and the needle winding.

[0130] In addition, a sufficient distance is maintained between the vent end 1121 and the end of the blade portion 13, so that the airflow has a certain diffusion space when it acts on the end of the diaphragm 310, so that the airflow can more smoothly and evenly adsorb or blow the third section of the diaphragm 310, thereby enhancing the bending control capability.

[0131] The following is for reference. Figures 3-5 The diaphragm cutter 10 according to a specific embodiment of the present invention will be described in detail below. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0132] The diaphragm cutter 10 includes a blade body 11 and a cutting edge 13.

[0133] The blade body 11 is a plate extending along a first direction. The blade body 11 has a vent 1121, which faces the blade portion 13 and is arranged along the first direction. The vent 1121 is either an intake port or an exhaust port, and is configured to draw in or blow air when the diaphragm 310 is wound around the inner roll structure 312, thereby adsorbing or blowing air onto the end of the diaphragm 310 to form a third roll segment 3123.

[0134] The vent 1121 includes a plurality of vents 11211 arranged along the first direction.

[0135] The blade body 11 includes: a first plate 111 and a second plate 112.

[0136] One end of the first plate 111 forms a blade portion 13.

[0137] The second plate 112 is connected to one side of the first plate 111, and an air hole 11211 is formed on the end face of the second plate 112 facing the blade portion 13.

[0138] The first plate 111 and the second plate 112 are an integrated structure.

[0139] The blade body 11 has a main air passage 1122 and multiple branch air passages 1123. One end of each branch air passage 1123 forms an air hole 11211, and the other end of each branch air passage 1123 is connected to the main air passage 1122. The main air passage 1122 extends along a first direction, and the multiple branch air passages 1123 are parallel and extend along a second direction, which is perpendicular to the first direction.

[0140] The blade portion 13 includes a plurality of serrations 131 arranged along a first direction. Each serration 131 has a tooth tip 1311, and at least a portion of the air holes 11211 are provided in a one-to-one correspondence with the tooth tips 1311 of at least a portion of the serrations 131.

[0141] Other components of the diaphragm cutter 10 according to the embodiments of the present invention, such as the blade portion 13, and its operation are known to those skilled in the art and will not be described in detail here.

[0142] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0143] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wound core comprising at least two electrodes and a diaphragm sandwiched between each pair of said electrodes, characterized in that, The thickness of the diaphragm is d, and it satisfies 0 μm. <d<7μm; The diaphragm includes a membrane body and an inwardly rolled structure disposed at one end of the membrane body in the longitudinal direction. The inwardly rolled structure is wound around the center of the core. The inwardly rolled structure includes: The first roll segment, one end of which is connected to the membrane body; The second roll segment has one end connected to the other end of the first roll segment, and the second roll segment is bent relative to the first roll segment; The third section is connected to the other end of the second section, and the third section is bent relative to the second section. Furthermore, the first roll segment and the third roll segment are located on the same side of the second roll segment to make the involute structure C-shaped, or the first roll segment and the third roll segment are located on opposite sides of the second roll segment to make the involute structure Z-shaped.

2. A battery, characterized in that, include: case; The core according to claim 1 is disposed within the housing.

3. A battery assembly, characterized in that, The invention includes the battery and circuit structure as described in claim 2, wherein the circuit structure is electrically connected to the battery.

4. An electrical appliance, characterized in that, It includes the battery according to claim 2, or the battery assembly according to claim 3.

5. A diaphragm cutter for processing the core according to claim 1, characterized in that, include: Blade body; The blade portion is located at one end of the blade body and is used to cut off one end edge of the diaphragm in the length direction; The blade body is provided with a vent end, which is positioned towards the blade edge. The vent is configured to draw in or blow air into the diaphragm as it is wound to form the inward roll structure, thereby adsorbing or blowing the end of the diaphragm to bend and form the third roll segment.

6. The diaphragm cutter according to claim 5, characterized in that, The venting end includes a plurality of air holes arranged along a first direction, which is parallel to or forms an acute angle with the width direction of the diaphragm.

7. The diaphragm cutter according to claim 5, characterized in that, The blade portion includes a plurality of serrations arranged along a first direction, which is parallel to or forms an acute angle with the width direction of the diaphragm.

8. The diaphragm cutter according to claim 7, characterized in that, The saw teeth have tips, and the venting end includes at least one air hole corresponding to the tip of the tooth.

9. The diaphragm cutter according to claim 6, characterized in that, The blade body is a plate extending along the first direction, and the cutting edge is located at one end of the blade body opposite each other along the second direction, which is perpendicular to the first direction. The blade body is provided with a main air passage and multiple branch air passages. One end of each branch air passage forms the air hole, and the other end of each branch air passage is connected to the main air passage. The blade body is provided with an air source connection end that connects to the main air passage.

10. The diaphragm cutter according to claim 9, characterized in that, The blade body includes: A first plate, one end of which is connected to the blade portion along the second direction; The second plate is connected to the other end of the first plate along the second direction. The thickness of the second plate is greater than that of the first plate. A blade-step surface is formed at the connection between the second plate and the first plate. The blade-step surface is disposed facing the blade portion, and the air hole is formed on the blade-step surface.

11. The diaphragm cutter according to claim 10, characterized in that, The first plate and the second plate are an integrated structure; The second plate includes a flat plate portion and a protruding plate portion, wherein the flat plate portion and the protruding plate portion are disposed along the thickness direction of the second plate. The flat plate portion is connected to and flush with the first plate body, the end face of the protruding plate portion includes the blade-step surface, and a plurality of the branch air passages are formed within the protruding plate portion.

12. A winding device, characterized in that, include: A winding component having an openable and closable slit, wherein the diaphragm includes a first section, a second section, and a third section arranged sequentially at one end in the length direction, the second section being adapted to be clamped in the slit, and the first section and the third section being adapted to be respectively arranged on both sides of the slit; The diaphragm cutter according to any one of claims 5-11 is disposed on the side of the winding member exposing the third segment; The diaphragm cutter is used to cut off one end edge of the diaphragm in the length direction when the winding member clamps the diaphragm, and cooperates with the winding member to suck or blow the third segment, so that the first segment becomes the first roll segment, the second segment becomes the second roll segment, and the third segment becomes the third roll segment.

13. The winding apparatus according to claim 12, characterized in that, The winding component includes two winding needles, which are: A fixed coiling needle is provided, which is rotatable, and one side of the fixed coiling needle forms a clamping and fixing surface. A movable coiling needle is connected to the fixed coiling needle, one side of which forms a movable fixing surface facing the clamping fixing surface, and the clamping fixing surface and the movable fixing surface define the gap. The movable coiling needle is movable relative to the fixed coiling needle in the thickness direction of the gap to open and close the gap; The diaphragm cutter is located on one side of the fixed coil needle or the movable coil needle.

14. The winding apparatus according to claim 13, characterized in that, The distance between the vent end and the end of the blade portion along the second direction is X1, where X1 exceeds the width of a single coil needle, and the second direction is perpendicular to the width direction of the diaphragm. The width of the coiled needle is the dimension of the coiled needle along the thickness direction of the slit.

Images